Table Of Contents

sdm prefer

service password-recovery

service-policy

set

setup

show access-lists

show boot

show changes

show class-map

show cluster

show cluster candidates

show cluster members

show controllers cpu-interface

show controllers ethernet-controller

show controllers switch

show controllers tcam

show current

show dot1x

show env

show errdisable detect

show errdisable flap-values

show errdisable recovery

show etherchannel

show fm interface

show fm label

show fm vlan

show forward

show interfaces

show interfaces counters

show ip igmp profile

show ip igmp snooping

show l2tcam

show l3tcam

show mac-address-table

show mac-address-table address

show mac-address-table aging-time

show mac-address-table count

show mac-address-table dynamic

show mac-address-table interface

show mac-address-table multicast

show mac-address-table notification

show mac-address-table static

show mac-address-table vlan

show mls qos

show mls qos aggregate-policer

show mls qos interface

show mls qos maps

show monitor

show mvr

show mvr interface

show mvr members

show pagp

show policy-map

show port-security

show proposed

show sdm prefer

show spanning-tree

show storm-control

show system mtu

show tcam

show tcam qos

show udld

show version

show vlan

show vlan access-map

show vlan filter

show vmps

show vtp

shutdown

shutdown vlan

snmp-server enable traps

snmp-server host

snmp trap mac-notification

spanning-tree backbonefast

spanning-tree cost

spanning-tree etherchannel guard misconfig

spanning-tree extend system-id

spanning-tree guard

spanning-tree port-priority

spanning-tree portfast

spanning-tree portfast bpduguard

spanning-tree stack-port

spanning-tree uplinkfast

spanning-tree vlan

speed

standby mac-address

storm-control

switchcore

switchport

switchport access

switchport block

switchport broadcast

switchport mode

switchport multicast

switchport nonegotiate

switchport port-security

switchport protected

switchport trunk

switchport unicast

system mtu

2

sdm prefer

Use the sdm prefer global configuration command to configure the template used in Switch Database Management (SDM) resource allocation. A template allows you to allocate system memory to best support the features being used in your application. It allows you to approximate the maximum number of unicast MAC addresses, Internet Group Management Protocol (IGMP) groups, quality of service (QoS) access control entries (ACEs), security ACEs, unicast routes, multicast routes, subnet VLANs (routed interfaces), and Layer 2 VLANs that can be configured on the switch. Use the no form of the command to return to the default settings.

sdm prefer {access | routing | vlan}

no sdm prefer

Syntax Description

access	Provide maximum system utilization for multicast traffic, QoS classification ACEs, and security ACEs, typical for an access switch at the network edge.
routing	Provide maximum system utilization for unicast routing, minimizing QoS classification ACLs and security ACLs, typical for a router or aggregator in the middle of a network.
vlan	Provide maximum system utilization for VLANs, with routing disabled. This template maximizes system memory for use as a Layer 2 switch with no routing.

Defaults

The default template provides a balance to all features.

Command Modes

Global configuration

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.
12.1(6)EA1	Template values revised. Templates for Fast Ethernet switches were added.
12.1(8)EA1	Template values for Gigabit Ethernet switches revised.

Usage Guidelines

The switch must reload for the configuration to take effect.

Using the sdm prefer vlan command disables routing capability in the switch. Any routing configurations will be rejected after the reload, and those options might be lost. When the switch reloads, the message "Running Layer2 Switching Only Image" appears, even though you are really running a Layer 3 image with the routing functionality disabled. Use the sdm prefer vlan command only on switches intended for Layer 2 switching with no routing.

Do not use the routing template if you do not have the enhanced multilayer software image installed on your switch. Entering the sdm prefer routing global configuration command on a switch that does not have the enhanced multilayer software image would not enable routing, but it would prevent other features from using the approximately 17 K of memory allocated to unicast and multicast routing in the routing template.

Table 2-10 lists the approximate number of each resource supported in each of the four templates for a Gigabit Ethernet switch. Table 2-11 lists the approximate number supported for a switch with mostly Fast Ethernet ports. The first six rows in the tables (unicast MAC addresses through multicast routes) represent approximate hardware boundaries set when a template is selected. If a section of a hardware resource is full, all processing overflow is sent to the CPU, seriously impacting switch performance.

The last two rows, the total number of routed ports and SVIs and the number of Layer 2 VLANs, are guidelines used to calculate hardware resource consumption related to the other resource parameters.

The number of subnet VLANs (routed ports and SVIs) are not limited by software and can be set to a number higher than indicated in the tables. If the number of subnet VLANs configured is lower or equal to the number in the tables, the number of entries in each category (Unicast addresses, IGMP groups, and so on) for each template will be as indicated. As the number of subnet VLANs is increased, CPU utilization will typically increase. If the number of subnet VLANs is increased beyond the number indicated in the tables, the number of supported entries in each category may decrease depending on features that are enabled. For example, if PIM-DVMRP is enabled with more than 16 subnet VLANs, the number of entries for multicast routes will be in the range of 1K-5K entries for the access template.

Table 2-10 Approximate Number of Feature Resources Allowed by Each Template for Gigabit Ethernet Switches

Resource	Default Template	Access Template	Routing Template	VLAN Template
Unicast MAC addresses	6 K	2 K	6 K	12 K
IGMP groups (managed by Layer 2 multicast features such as MVR or IGMP snooping)	6 K	8 K	6 K	6 K
QoS classification ACEs	2K	2 K	1 K	2 K
Security ACEs	2 K	4 K	1 K	2 K
Unicast routes	12 K	4 K	24 K	0
Multicast routes	6 K	8 K	6 K	0
Routed interfaces (routed ports and SVIs)	16	16	16	16
Layer 2 VLANs	1 K	1 K	1 K	1 K

Table 2-11 Approximate Number of Feature Resources Allowed by Each Template for Fast Ethernet Switches

Resource	Default Template	Access Template	Routing Template	VLAN Template
Unicast MAC addresses	5 K	1 K	5 K	8 K
IGMP groups (managed by Layer 2 multicast features such as MVR and IGMP snooping)	1 K	2 K	1 K	1 K
QoS ACEs	1 K	2 K	512	1 K
Security ACEs	1 K	2 K	512	1 K
Unicast routes	8 K	2 K	16 K	0
Multicast routes	1 K	2 K	1 K	0
Routed interfaces (routed ports and SVIs)	8	8	8	8
Layer 2 VLANs	1 K	1 K	1 K	1 K

Examples

This example shows how to configure the routing template on the switch:

Switch(config)# sdm prefer routing

Switch(config)# exit

Switch# reload

This example shows how to remove the routing template and use the default template:

Switch(config)# no sdm prefer routing

Switch(config)# exit

Switch# reload

You can verify your settings by entering the show sdm prefer privileged EXEC command.

Related Commands

Command	Description
show sdm prefer	Displays the current SDM template in use or displays the templates that can be used, with approximate resource allocation per feature.

service password-recovery

Use the service password-recovery global configuration command to enable the password-recovery mechanism (the default). This mechanism allows a user with physical access to the switch to hold down the Mode button and interrupt the boot process while the switch is powering up and to assign a new password. Use the no form of this command to disable part of the password-recovery functionality. When the password-recovery mechanism is disabled, interrupting the boot process is allowed only if the user agrees to set the system back to the default configuration.

service password-recovery

no service password-recovery

Syntax Description

This command has no arguments or keywords.

Defaults

The default action is for the password-recovery mechanism to be enabled.

Command Modes

Global configuration

Command History

Release	Modification
12.1(6)EA1a	This command was first introduced.

Usage Guidelines

This command is valid only on Catalyst 3550 Fast Ethernet switches; it is not available for Gigabit Ethernet switches.

As a system administrator, you can use the no service password-recovery command to disable some of the functionality of the password recovery feature by allowing an end user to reset a password only by agreeing to return to the default configuration.

The password-recovery mechanism has been triggered, but

is currently disabled.  Access to the boot loader prompt

through the password-recovery mechanism is disallowed at

this point.  However, if you agree to let the system be

reset back to the default system configuration, access

to the boot loader prompt can still be allowed.

Would you like to reset the system back to the default configuration (y/n)?

If the user chooses not to reset the system back to the default configuration, the normal boot process continues, as if the Mode button had not been pressed. If you choose to reset the system back to the default configuration, the configuration file in flash memory is deleted and the VLAN database file, flash:vlan.dat (if present) is deleted.

---

Note If you use the no service password-recovery command to control end user access to passwords, we recommend that you save a copy of the config file in a location away from the switch in case the end user uses the password recovery procedure and sets the system back to defaults. Do not keep a backup copy of the config file on the switch.

If the switch is operating in VTP transparent mode, we recommend that you also save a copy of the vlan.dat file in a location away from the switch.

---

You can verify if password recovery is enabled or disabled by entering the show version privileged EXEC command.

Examples

This is an example of the output from the show version privileged EXEC command when password-recovery is disabled.

Switch# show version

1w6d: %SYS-5-CONFIG_I: Configured from console by console

Cisco Internetwork Operating System Software

IOS (tm) C3550 Software (C3550-I9Q3L2-M), Version 12.1(8)EA1, RELEASE SOFTWARE (fc1)

Copyright (c) 1986-2001 by cisco Systems, Inc.

Compiled Wed 24-Oct-01 06:20 by antonino

Image text-base: 0x00003000, data-base: 0x004C1864

ROM: Bootstrap program is C3550 boot loader

flam-1-6 uptime is 1 week, 6 days, 3 hours, 59 minutes

System returned to ROM by power-on

System image file is "flash:c3550--i9q3l2-mz.121-8EA1.bin"

cisco WS-C3550-48 (PowerPC) processor with 65526K/8192K bytes of memory.

Last reset from warm-reset

Running Layer2 Switching Only Image

Ethernet-controller 1 has 12 Fast Ethernet/IEEE 802.3 interfaces

Ethernet-controller 2 has 12 Fast Ethernet/IEEE 802.3 interfaces

Ethernet-controller 3 has 12 Fast Ethernet/IEEE 802.3 interfaces

Ethernet-controller 4 has 12 Fast Ethernet/IEEE 802.3 interfaces

Ethernet-controller 5 has 1 Gigabit Ethernet/IEEE 802.3 interface

Ethernet-controller 6 has 1 Gigabit Ethernet/IEEE 802.3 interface

48 FastEthernet/IEEE 802.3 interface(s)

2 Gigabit Ethernet/IEEE 802.3 interface(s)

The password-recovery mechanism is disabled.

32K bytes of flash-simulated non-volatile configuration memory.

Base ethernet MAC Address: AA:00:0B:2B:02:00

Configuration register is 0x10F

Related Commands

Command	Description
show version	Displays version information for the hardware and firmware.

service-policy

Use the service-policy interface configuration command to apply a policy map defined by the policy-map command to the input or output of a particular interface. Use the no form of this command to remove the policy map and interface association.

service-policy {input policy-map-name | output policy-map-name}

no service-policy {input policy-map-name | output policy-map-name}

Syntax Description

input policy-map-name	Apply the specified policy-map to the input of an interface.
output policy-map-name	Apply the specified policy-map to the output of an interface.

---

Note Though visible in the command-line help strings, the history keyword is not supported, and you should ignore the statistics it gathers.

---

Defaults

No policy maps are attached to the interface.

Command Modes

Interface configuration

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

Only one policy map per interface per direction is supported.

You cannot attach policy maps that contain set or trust policy-map class configuration commands or that have an access control list (ACL) classification to an egress interface by using the service-policy interface configuration command. The only match criterion supported is with the match ip dscp dscp-list class-map configuration command.

Examples

This example shows how to apply plcmap1 to an ingress interface:

Switch(config)# interface gigabitethernet0/1

Switch(config-if)# service-policy input plcmap1

This example shows how to apply plcmap2 to an egress interface:

Switch(config)# interface gigabitethernet0/2

Switch(config-if)# service-policy output plcmap2

This example shows how to detach plcmap2 from an interface2:

Switch(config)# interface gigabitethernet0/2

Switch(config-if)# no service-policy input plcmap2

You can verify your settings by entering the show running-config privileged EXEC command.

Related Commands

Command	Description
policy-map	Creates or modifies a policy map that can be attached to multiple interfaces to specify a service policy.
show policy-map	Displays quality of service (QoS) policy maps.

set

Use the set policy-map class configuration command to classify IP traffic by setting a Differentiated Services Code Point (DSCP) or IP-precedence value in the packet. Use the no form of this command to remove traffic classification.

set {ip dscp new-dscp | ip precedence new-precedence}

no set {ip dscp new-dscp | ip precedence new-precedence}

Syntax Description

ip dscp new-dscp	New DSCP value assigned to the classified traffic. The range is 0 to 63.
ip precedence new-precedence	New IP-precedence value assigned to the classified traffic. The range is 0 to 7.

---

Note Though visible in the command-line help strings, the mpls keyword is not supported.

---

Defaults

No traffic classification is defined.

Command Modes

Policy-map class configuration

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

The set command is mutually exclusive with the trust policy-map class configuration command within the same policy map.

You cannot attach policy maps that contain set or trust policy-map class configuration commands or that have an access control list (ACL) classification to an egress interface by using the service-policy interface configuration command.

For the set ip dscp new-dscp or the set ip precedence new-precedence command, you can enter a mnemonic name for a commonly-used value. For example, you can enter the set ip dscp af11 command, which is the as same entering the set ip dscp 10 command. You can enter the set ip precedence critical command, which is the same as entering the set ip precedence 5 command. For a list of supported mnemonics, enter the set ip dscp ? or the set ip precedence ? command to see the command-line help strings.

To return to policy-map configuration mode, use the exit command. To return to privileged EXEC mode, use the end command.

Examples

This example shows how to assign DSCP 10 to all FTP traffic without any policers:

Switch(config)# policy-map policy_ftp

Switch(config-pmap)# class ftp_class

Switch(config-pmap-c)# set ip dscp 10

Switch(config-pmap)# exit

You can verify your settings by entering the show policy-map privileged EXEC command.

Related Commands

Command	Description
police	Defines a policer for classified traffic.
policy-map	Creates or modifies a policy map that can be attached to multiple interfaces to specify a service policy.
show policy-map	Displays quality of service (QoS) policy maps.
trust	Defines a trust state for traffic classified by the class policy-map configuration command or the class-map global configuration command.

setup

Use the setup privileged EXEC command to configure the switch with its initial configuration.

setup

Syntax Description

This command has no arguments or keywords.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

When you use the setup command, make sure that you have this information:

•IP address and network mask

•Password strategy for your environment

•Whether the switch will be used as the command switch in a cluster and the cluster name

When you enter the setup command, an interactive dialog, called the System Configuration Dialog, appears. It guides you through the configuration process and prompts you for information. The values shown in brackets next to each prompt are the default values last set by using either the setup command facility or the configure privileged EXEC command.

Help text is provided for each prompt. To access help text, press the question mark (?) key at a prompt.

To return to the privileged EXEC prompt without making changes and without running through the entire System Configuration Dialog, press Ctrl-C.

When you complete your changes, the setup program shows you the configuration command script that was created during the setup session. You can save the configuration in nonvolatile RAM (NVRAM), return to the setup program without saving, or return to the command-line prompt without saving the configuration.

Examples

This is an example of output from the setup command:

Switch# setup

--- System Configuration Dialog ---

Continue with configuration dialog? [yes/no]: yes

At any point you may enter a question mark '?' for help.

Use ctrl-c to abort configuration dialog at any prompt.

Default settings are in square brackets '[]'.

Basic management setup configures only enough connectivity

for management of the system, extended setup will ask you

to configure each interface on the system.

Would you like to enter basic management setup? [yes/no]: yes

Configuring global parameters:

Enter host name [Switch]:host-name

  The enable secret is a password used to protect access to

  privileged EXEC and configuration modes. This password, after

  entered, becomes encrypted in the configuration.

  Enter enable secret: enable-secret-password

  The enable password is used when you do not specify an

  enable secret password, with some older software versions, and

  some boot images.

  Enter enable password: enable-password

  The virtual terminal password is used to protect

  access to the router over a network interface.

  Enter virtual terminal password: terminal-password

  Configure SNMP Network Management? [no]: yes

  Community string [public]: 

Current interface summary

Any interface listed with OK? value "NO" does not have a valid configuration

Interface                  IP-Address      OK? Method Status                Protocol

Vlan1                      172.20.135.202  YES NVRAM  up                    up

GigabitEthernet0/1         unassigned      YES unset  up                    up

GigabitEthernet0/2         unassigned      YES unset  up                    down

GigabitEthernet0/3         unassigned      YES unset  administratively down down

GigabitEthernet0/4         unassigned      YES unset  up                    down

GigabitEthernet0/5         unassigned      YES NVRAM  up                    down

GigabitEthernet0/6         unassigned      YES NVRAM  up                    down

GigabitEthernet0/7         unassigned      YES unset  up                    down

GigabitEthernet0/8         unassigned      YES unset  up                    down

GigabitEthernet0/9         unassigned      YES unset  administratively down down

GigabitEthernet0/10        10.1.2.3        YES NVRAM  up                    down

GigabitEthernet0/11        unassigned      YES unset  up                    down

GigabitEthernet0/12        unassigned      YES unset  up                    down

Port-channel1              unassigned      YES unset  up                    down

Enter interface name used to connect to the

management network from the above interface summary: vlan1

Configuring interface vlan1:

Configure IP on this interface? [yes]: yes 

IP address for this interface: ip_address

Subnet mask for this interface [255.0.0.0]: subnet_mask

Would you like to enable as a cluster command switch? [yes/no]: yes

Enter cluster name: cluster-name

The following configuration command script was created:

hostname host-name

enable secret 5 $1$LiBw$0Xc1wyT.PXPkuhFwqyhVi0

enable password enable-password

line vty 0 15

password terminal-password

snmp-server community public

!

no ip routing

!

interface GigabitEthernet0/1

no ip address

!

interface GigabitEthernet0/2

no ip address

! 

...

interface GigabitEthernet0/12

no ip address

cluster enable cluster-name

!

end

Use this configuration? [yes/no]: yes

!

[0] Go to the IOS command prompt without saving this config.

[1] Return back to the setup without saving this config.

[2] Save this configuration to nvram and exit.

Enter your selection [2]:

Related Commands

Command	Description
show running-config	Displays the running configuration on the switch. For syntax information, select Cisco IOS Configuration Fundamentals Command Reference for Release 12.1 > Cisco IOS File Management Commands > Configuration File Commands.
show version	Displays version information for the hardware and firmware.

show access-lists

Use the show access-lists privileged EXEC command to display router access control lists (ACLs) configured on the switch.

show access-lists [name | number | hardware counters] [ | {begin | exclude | include} expression]

Syntax Description

name	(Optional) Name of the ACL.
number	(Optional) ACL number. The range is from 1 to 2699.
hardware counters	(Optional) Display global hardware ACL statistics for switched and routed packets.
| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

The Catalyst 3550 multilayer switch supports only IP standard and extended access lists. Therefore, the allowed numbers are only 1 to 199 and 1300 to 2699.

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

Examples

This is an example of output from the show access-lists command:

Switch# show access-lists

Standard IP access list 13

    permit any

Standard IP access list permit Any

    permit any

Extended IP access list 101

    permit icmp any any conversion-error

    permit 234 host 172.30.40.1 host 123.23.23.2

Extended IP access list 102

    permit esp any any

    permit eigrp any any tos min-monetary-cost

Extended IP access list 103

    permit icmp any any 40 60

Extended IP access list CMP-NAT-ACL

    Dynamic Cluster-NAT permit ip any any

Extended MAC access list abc2

    permit host 1100.bb00.00cc host 2234.0123.2345     

Related Commands

Command	Description
access-list	Configures a standard or extended numbered access list on the switch. For syntax information, select Cisco IOS IP and IP Routing Command Reference for IOS Release 12.1 > IP Addressing and Services > IP Services Commands.
ip access list	Configures a named IP access list on the switch. For syntax information, select Cisco IOS IP and IP Routing Command Reference for IOS Release 12.1 > IP Addressing and Services > IP Services Commands.
mac access-list extended	Configures a named or numbered MAC access list on the switch.

show boot

Use the show boot privileged EXEC command to display the settings of the boot environment variables.

show boot [ | {begin | exclude | include} expression]

Syntax Description

| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

Examples

This is an example of output from the show boot command. Table 2-12 describes each field in the display.

Switch# show boot

BOOT path-list:      flash:c3550-i5q3l2-mz-121.4.EA1/c3550-i5q3l2-mz-121.4.EA1.bin

Config file:         flash:config.text

Enable Break:        no

Manual Boot:         yes

HELPER path-list:

NVRAM/Config file

      buffer size:   32768 

Table 2-12 show boot Field Descriptions

Field	Description
BOOT path-list	Displays a semicolon separated list of executable files to try to load and execute when automatically booting. If the BOOT environment variable is not set, the system attempts to load and execute the first executable image it can find by using a recursive, depth-first search through the Flash file system. In a depth-first search of a directory, each encountered subdirectory is completely searched before continuing the search in the original directory. If the BOOT variable is set but the specified images cannot be loaded, the system attempts to boot the first bootable file that it can find in the Flash file system.
Config file	Displays the filename that IOS uses to read and write a nonvolatile copy of the system configuration.
Enable Break	Displays whether a break during booting is enabled or disabled. If it is set to yes, on, or 1, you can interrupt the automatic boot process by pressing the Break key on the console after the Flash file system is initialized.
Manual Boot	Displays whether the switch automatically or manually boots. If it is set to no or 0, the boot loader attempts to automatically boot the system. If it is set to anything else, you must manually boot the switch from the boot loader mode.
Helper path-list	Displays a semicolon separated list of loadable files to dynamically load during the boot loader initialization. Helper files extend or patch the functionality of the boot loader.
NVRAM/Config file buffer size	Displays the buffer size that IOS uses to hold a copy of the configuration file in memory. The configuration file cannot be larger than the buffer size allocation.

Related Commands

Command	Description
boot buffersize	Specifies the size of the file system-simulated NVRAM in Flash memory.
boot config-file	Specifies the filename that IOS uses to read and write a nonvolatile copy of the system configuration.
boot enable-break	Enables interrupting the automatic boot process.
boot manual	Enables manually booting the switch during the next boot cycle.
boot system	Specifies the IOS image to load during the next boot cycle.

show changes

Use the show changes VLAN configuration command to display the differences between the VLAN database currently on the switch and the proposed VLAN database. You can also display the differences between the two for a selected VLAN.

show changes [vlan-id]

Syntax Description

vlan-id

(Optional) ID of the VLAN in the current or proposed database. If this variable is omitted, all the differences between the two VLAN databases are displayed, including the pruning state and Version 2 mode. Valid IDs are from 1 to 1005; do not enter leading zeros.

Command Modes

VLAN configuration

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Examples

This is an example of output from the show changes command. It displays the differences between the current and proposed databases.

Switch(vlan)# show changes

DELETED:

  VLAN ISL Id: 4

    Name: VLAN0004

    Media Type: Ethernet

    VLAN 802.10 Id: 100004

    State: Operational

    MTU: 1500

DELETED:

  VLAN ISL Id: 6

    Name: VLAN0006

    Media Type: Ethernet

    VLAN 802.10 Id: 100006

    State: Operational

    MTU: 1500

MODIFIED:

  VLAN ISL Id: 7

    Current State: Operational

    Modified State: Suspended 

This is an example of output from the show changes 7 command. It displays the differences between VLAN 7 in the current database and the proposed database.

Switch(vlan)# show changes 7

MODIFIED:

  VLAN ISL Id: 7

    Current State: Operational

    Modified State: Suspended 

Related Commands

Command	Description
show current	Displays the current VLAN database on the switch or a selected VLAN from it.
show proposed	Displays the proposed VLAN database or a selected VLAN from it.

show class-map

Use the show class-map privileged EXEC command to display quality of service (QoS) class maps, which define the match criteria to classify traffic.

show class-map [class-map-name] [ | {begin | exclude | include} expression]

Syntax Description

class-map-name	(Optional) Display the contents of the specified class map.
| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

Examples

This is an example of output from the show class-map command:

Switch# show class-map class1

 Class Map match-any class1 (id 4)

   Match ip dscp 11 21 

Related Commands

Command	Description
class-map	Creates a class map to be used for matching packets to the class whose name you specify.
match (class-map configuration)	Defines the match criteria (access control lists [ACLs], IP precedence, or IP Differentiated Services Code Point [DSCP] values) to classify traffic.

show cluster

Use the show cluster privileged EXEC command to display the cluster status and a summary of the cluster to which the switch belongs. This command can be entered on command and member switches.

show cluster [ | {begin | exclude | include} expression]

Syntax Description

| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

If the switch is not a command switch or a member switch, the command displays an empty line at the prompt.

On a member switch, this command displays the identity of the command switch, the switch member number, and the state of its connectivity with the command switch.

On a command switch, this command displays the cluster name, and the total number of members. It also shows the cluster status and time since the status changed. If redundancy is enabled, it displays the primary and secondary command-switch information.

If you enter this command on a switch that is not a cluster member, the error message Not a management cluster member is displayed.

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

Examples

This is an example of output when the show cluster command is executed on the active command switch:

Switch# show cluster

Command switch for cluster "Ajang"

        Total number of members:        7

        Status:                         1 members are unreachable

        Time since last status change:  0 days, 0 hours, 2 minutes

        Redundancy:                     Enabled

                Standby command switch: Member 1

                Standby Group:          Ajang_standby

                Standby Group Number:   110

        Heartbeat interval:             8

        Heartbeat hold-time:            80

        Extended discovery hop count:   3 

This is an example of output when the show cluster command is executed on a member switch:

Switch1# show cluster

Member switch for cluster "hapuna"

        Member number:                  3

        Management IP address:          192.192.192.192

        Command switch mac address:     0000.0c07.ac14

        Heartbeat interval:             8

        Heartbeat hold-time:            80 

This is an example of output when the show cluster command is executed on a member switch that is configured as the standby command switch:

Switch# show cluster

Member switch for cluster "hapuna"

        Member number:                  3 (Standby command switch)

        Management IP address:          192.192.192.192

        Command switch mac address:     0000.0c07.ac14

        Heartbeat interval:             8

        Heartbeat hold-time:            80 

This is an example of output when the show cluster command is executed on the command switch that is separated from member 1:

Switch# show cluster

Command switch for cluster "Ajang"

        Total number of members:        7

        Status:                         1 members are unreachable

        Time since last status change:  0 days, 0 hours, 5 minutes

        Redundancy:                     Disabled

        Heartbeat interval:             8

        Heartbeat hold-time:            80

        Extended discovery hop count:   3 

This is an example of output when the show cluster command is executed on a member switch that is separated from the command switch:

Switch# show cluster

Member switch for cluster "hapuna"

        Member number:                  <UNKNOWN>

        Management IP address:          192.192.192.192

        Command switch mac address:     0000.0c07.ac14

        Heartbeat interval:             8

        Heartbeat hold-time:            80 

Related Commands

Command	Description
cluster enable	Enables a command-capable switch as the cluster command switch, assigns a cluster name, and optionally assigns a member number to it.
show cluster candidates	Displays a list of candidate switches.
show cluster members	Displays information about the cluster members.

show cluster candidates

Use the show cluster candidates privileged EXEC command on the command switch to display a list of candidate switches.

show cluster candidates [detail | mac-address H.H.H.] [ | {begin | exclude | include} expression]

Syntax Description

detail	(Optional) Display detailed information for all candidates.
mac-address H.H.H.	(Optional) MAC address of the cluster candidate.
| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

You should enter this command only on a command switch.

If the switch is not a command switch, the command displays an empty line at the prompt.

The SN in the display means switch member number. If E is displayed in the SN column, it means that the switch is discovered through extended discovery. The hop count is the number of devices the candidate is from the command switch.

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

Examples

This is an example of output from the show cluster candidates command:

Switch# show cluster candidates

                                                             |---Upstream---|

MAC Address    Name         Device Type      PortIf  FEC Hops SN PortIf  FEC

00d0.7961.c4c0 StLouis-2    WS-C3550-12T     Gi0/1        2   1  Fa0/11 

00d0.bbf5.e900 ldf-dist-128 WS-C3524-XL      Fa0/7        1   0  Fa0/24      

00e0.1e7e.be80 1900_Switch  1900             3        0   1   0  Fa0/11      

00e0.1e9f.7a00 Surfers-24   WS-C2924-XL      Fa0/5        1   0  Fa0/3       

00e0.1e9f.8c00 Surfers-12-2 WS-C2912-XL      Fa0/4        1   0  Fa0/7       

00e0.1e9f.8c40 Surfers-12-1 WS-C2912-XL      Fa0/1        1   0  Fa0/9       

This is an example of output from the show cluster candidates command that uses the MAC address of a member switch directly connected to the command switch:

Switch# show cluster candidates mac-address 00d0.7961.c4c0

Device 'Tahiti-12' with mac address number 00d0.7961.c4c0

        Device type:            cisco WS-C3512-XL

        Upstream MAC address:   00d0.796d.2f00 (Cluster Member 0)

        Local port:             Fa0/3   FEC number: 

        Upstream port:          Fa0/13  FEC Number: 

        Hops from cluster edge: 1

        Hops from command device: 1

This is an example of output from the show cluster candidates command that uses the MAC address of a member switch three hops from the cluster edge:

Switch# show cluster candidates mac-address 0010.7bb6.1cc0

Device 'Ventura' with mac address number 0010.7bb6.1cc0

        Device type:            cisco WS-C2912MF-XL

        Upstream MAC address:   0010.7bb6.1cd4

        Local port:             Fa2/1   FEC number: 

        Upstream port:          Fa0/24  FEC Number: 

        Hops from cluster edge: 3

        Hops from command device: -

This is an example of output from the show cluster candidates detail command:

Switch# show cluster candidates detail

Device 'Tahiti-12' with mac address number 00d0.7961.c4c0

        Device type:            cisco WS-C3512-XL

        Upstream MAC address:   00d0.796d.2f00 (Cluster Member 1)

        Local port:             Fa0/3   FEC number: 

        Upstream port:          Fa0/13  FEC Number: 

        Hops from cluster edge: 1

        Hops from command device: 2

	Device '1900_Switch' with mac address number 00e0.1e7e.be80

        Device type:            cisco 1900

        Upstream MAC address:   00d0.796d.2f00 (Cluster Member 2)

        Local port:             3       FEC number: 0

        Upstream port:          Fa0/11  FEC Number: 

        Hops from cluster edge: 1

        Hops from command device: 2

Device 'Surfers-24' with mac address number 00e0.1e9f.7a00

        Device type:            cisco WS-C2924-XL

        Upstream MAC address:   00d0.796d.2f00 (Cluster Member 3)

        Local port:             Fa0/5   FEC number: 

        Upstream port:          Fa0/3   FEC Number: 

        Hops from cluster edge: 1

        Hops from command device: 2

Related Commands

Command	Description
show cluster	Displays the cluster status and a summary of the cluster to which the switch belongs.
show cluster members	Displays information about the cluster members.

show cluster members

Use the show cluster members privileged EXEC command on the command switch to display information about the cluster members.

show cluster members [n | detail] [ | {begin | exclude | include} expression]

Syntax Description

n	(Optional) Number that identifies a cluster member. The range is from 0 to 15.
detail	(Optional) Display detailed information for all cluster members.
| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

You should enter this command only on a command switch.

If the cluster has no members, this command displays an empty line at the prompt.

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

Examples

This is an example of output from the show cluster members command. The SN in the display means switch number.

Switch# show cluster members

                                                |---Upstream---|

SN MAC Address    Name         PortIf FEC Hops   SN PortIf  FEC  State

0  0002.4b29.2e00 StLouis1                 0                    Up   (Cmdr)

1  0030.946c.d740 tal-switch-1 Fa0/13      1     0  Gi0/1       Up

2  0002.b922.7180 nms-2820     10      0   2     1  Fa0/18      Up

3  0002.4b29.4400 SanJuan2     Gi0/1       2     1  Fa0/11      Up

4  0002.4b28.c480 GenieTest    Gi0/2       2     1  Fa0/9       Up

This is an example of output from the show cluster members for cluster member 3:

Switch# show cluster members 3

Device 'SanJuan2' with member number 3

        Device type:            cisco WS-C3550-12T

        MAC address:            0002.4b29.4400

        Upstream MAC address:   0030.946c.d740 (Cluster member 1)

        Local port:             Gi0/1   FEC number:

        Upstream port:          Fa0/11  FEC Number:

        Hops from command device: 2    

This is an example of output from the show cluster members detail command:

Switch# show cluster members detail

Device 'StLouis1' with member number 0 (Command Switch)

        Device type:            cisco WS-C3550-12T

        MAC address:            0002.4b29.2e00

        Upstream MAC address:

        Local port:                     FEC number:

        Upstream port:                  FEC Number:

        Hops from command device: 0                 

Device 'tal-switch-14' with member number 1

        Device type:            cisco WS-C3548-XL

        MAC address:            0030.946c.d740

        Upstream MAC address:   0002.4b29.2e00 (Cluster member 0)

        Local port:             Fa0/13  FEC number:

        Upstream port:          Gi0/1   FEC Number:

        Hops from command device: 1                   

Device 'nms-2820' with member number 2

        Device type:            cisco 2820

        MAC address:            0002.b922.7180

        Upstream MAC address:   0030.946c.d740 (Cluster member 1)

        Local port:             10      FEC number: 0

        Upstream port:          Fa0/18  FEC Number:

        Hops from command device: 2                        

Device 'SanJuan2' with member number 3

        Device type:            cisco WS-C3550-12T

        MAC address:            0002.4b29.4400

        Upstream MAC address:   0030.946c.d740 (Cluster member 1)

        Local port:             Gi0/1   FEC number:

        Upstream port:          Fa0/11  FEC Number:

        Hops from command device: 2

Device 'GenieTest' with member number 4

        Device type:            cisco SeaHorse

        MAC address:            0002.4b28.c480

        Upstream MAC address:   0030.946c.d740 (Cluster member 1)

        Local port:             Gi0/2   FEC number:

        Upstream port:          Fa0/9   FEC Number:

        Hops from command device: 2

Device 'Palpatine' with member number 5

        Device type:            cisco WS-C2924M-XL

        MAC address:            00b0.6404.f8c0

        Upstream MAC address:   0002.4b29.2e00 (Cluster member 0)

        Local port:             Gi2/1   FEC number:

        Upstream port:          Gi0/7   FEC Number:

        Hops from command device: 1                            

Related Commands

Command	Description
show cluster	Displays the cluster status and a summary of the cluster to which the switch belongs.
show cluster candidates	Displays a list of candidate switches.

show controllers cpu-interface

Use the show controllers cpu-interface privileged EXEC command to display the state of the CPU network interface application-specific integrated circuit (ASIC) and the send and receive statistics for packets reaching the CPU.

show controllers cpu-interface [ | {begin | exclude | include} expression]

Syntax Description

| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

This display provides information that might be useful for Cisco technical support representatives troubleshooting the switch.

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

Examples

This is a partial output example from the show controllers cpu- interface command:

Switch# show controllers cpu-interface

stp packets = 134138472

ram access packets = 29206188

routing protocol packets = 86328

forwarding packets = 0

routing packets = 10385

L2 protocol packets = 689675

igmp snooping protocol packets = 2686727

addr learning packets = 0

icmp redirect packets = 0

icmp unreachable packets = 0

logging packets = 0

addr learning packets = 2058

rpffail packets = 0

queue13 = 0

queue14 = 0

queue15 = 0

RAM Access:

   11343623 sends   29206188 read replies      89491 write replies

   11343493 completed        129 retries          0 expedite toggles

          0 nomem          0 errors

SCInstance = 0x9B11B0

SCInstance fields: fs_notify_failed = 0, no_fsd_space = 0

           invalid_frames = 0, unexpected_valid_frames = 0

           too_large_frames = 0

           Aged frames from notify queues and unexpected retrieves:

               aged_frames[0] = 0, unexpected_retrieves[0] = 0

               aged_frames[1] = 0, unexpected_retrieves[1] = 0

               aged_frames[2] = 0, unexpected_retrieves[2] = 0

               aged_frames[3] = 0, unexpected_retrieves[3] = 0

<output truncated>

               aged_frames[15] = 0, unexpected_retrieves[15] = 0

           sc_cpu_buffer = 0x80000000, sc_regs = 0x81000000

           sc_notify_ram = 0x81010000

CPU Interface registers:

    0x810004A4:storage_congestion_time = 0x10

    0x810004A8:channel_number = 0x3120F

   0x810004AC:cpu_buffer_control = 0x1

   0x810004B0:current_time = 0x0

<output truncated>

0 0x81000574:cpu_buffer_diagnostics[2] = 0x0

    0x81000000:retrieval_info[0]:

        start_ptr = 0x8007A240, end_ptr = 0x8007A33F, read_ptr = 0x8007A2B0, wri

te_ptr = 0x8007A2B0

        requested_bytes 0x5F4, flags 0x40000007

    0x81000020:retrieval_info[1]:

<output truncated>

Related Commands

Command	Description
show controllers ethernet-controller	Displays per-interface transmit and receive statistics read from the hardware or the interface internal registers.
show interfaces	Displays the administrative and operational status of all interfaces or a specified interface.

show controllers ethernet-controller

Use the show controllers ethernet-controller privileged EXEC command without keywords to display per-interface transmit and receive statistics read from the hardware. Use with keywords to display the interface internal registers.

show controllers ethernet-controller interface-id [asic | phy] [ | {begin | exclude | include} expression]

Syntax Description

interface-id	The physical interface.
asic	(Optional) Display the state of the internal registers on the forwarding application-specific integrated circuit (ASIC) for the interface.
phy	(Optional) Display the status of the internal registers on the switch physical layer device (PHY) for the interface.
| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

This display without keywords provides traffic statistics, basically the RMON statistics for the interface.

When you enter the asic or phy keyword, the displayed information is useful primarily for Cisco technical support representatives troubleshooting the switch.

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

Examples

This is an example of output from the show controllers ethernet-controller command:

Switch# show controllers ethernet-controller gigabitethernet0/2

  Transmit GigabitEthernet0/2        Receive

3617834078 Bytes                 39726165 Bytes

    419261 Unicast frames          161535 Unicast frames

  82798461 Multicast frames        146421 Multicast frames

     12718 Broadcast frames             1 Broadcast frames

         0 Discarded frames             0 No dest, unicast

         0 Too old frames              43 No dest, multicast

         0 Deferred frames              0 No dest, broadcast

         0  1 collision frames

         0  2 collision frames          0 Alignment errors

         0  3 collision frames          0 FCS errors

         0  4 collision frames          0 Oversize frames

         0  5 collision frames          0 Undersize frames

         0  6 collision frames          0 Collision fragments

         0  7 collision frames

         0  8 collision frames     220108 Minimum size frames

         0  9 collision frames      60959 65 to 127 byte frames

         0 10 collision frames          0 128 to 255 byte frames

         0 11 collision frames      26931 256 to 511 byte frames

         0 12 collision frames          0 512 to 1023 byte frames

         0 13 collision frames          0 1024 to 1518 byte frames

         0 14 collision frames

         0 15 collision frames          0 Flooded frames

         0 Excessive collisions         0 Overrun frames

         0 Late collisions             16 VLAN filtered frames

         0 Good (1 coll) frames         0 Source routed frames

         0 Good(>1 coll) frames         0 Valid oversize frames

         0 Pause frames                 0 Pause frames

         0 VLAN discard frames          0 Symbol error frames

         0 Excess defer frames          0 Invalid frames, too large

         0 Too large frames             0 Valid frames, too large

  80469577 64 byte frames               0 Invalid frames, too small

   2605574 127 byte frames              3 Valid frames, too small

     58711 255 byte frames

     26956 511 byte frames

     70222 1023 byte frames

         0 1518 byte frames

Related Commands

Command	Description
show controllers cpu-interface	Displays the state of the CPU network ASIC and send and receive statistics for packets reaching the CPU.
show interfaces	Displays the administrative and operational status of all interfaces or a specified interface.

show controllers switch

Use the show controllers switch privileged EXEC command to display the settings of the resource-allocation priority or the wirespeed-store feature.

show controllers switch {resource-allocation priority | wirespeed-store} [ | {begin | exclude | include} expression]

Syntax Description

resource-allocation priority	Display the resource-allocation priority setting.
wirespeed-store	Display the wirespeed setting.
| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(6)EA1	This command was first introduced.

Usage Guidelines

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

Examples

This is an example of output from the show controllers switch resource-allocation priority command.

Switch# show controllers resource-allocation priority

Switch Priority Resource Allocation is enabled.

Related Commands

Command	Description
switchcore resource-allocation priority switchcore wirespeed-store	Reserves switch resources for high-priority traffic or gives buffer storage more priority than packet retrieval.

show controllers tcam

Use the show controllers tcam privileged EXEC command to display the state of the registers for all ternary content addressable memory (TCAM) in the system and for all TCAM interface application-specific integrated circuits (ASICs) that are CAM controllers.

show controllers tcam [ | {begin | exclude | include} expression]

Syntax Description

| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

This display provides information that might be useful for Cisco technical support representatives troubleshooting the switch.

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

Examples

This is an example of output from the show controllers tcam command:

Switch# show controllers tcam

CAM Controller 1:

  Revision: 5A5A5A00, Control: 0000025F, Status: 00000000.

  CAM 1:

    Revision: 00 00000000 00B30101

    Size: 00 00000000 00080040

    Device ID: 00 00000000 00000000

    Config: 00 00000000 88000002

    ReplyID[0]: 00 00000000 00000000

    ReplyID[1]: 00 00000000 00000000

    ReplyID[2]: 00 00000000 00000000

    ReplyID[3]: 00 00000000 00000000

    Hit Result[0]: 00 00000000 00000000

    Hit Result[1]: 00 00000000 00000000

    Hit Result[2]: 00 00000000 00000000

    Hit Result[3]: 00 00000000 00000000

    Hit Result[4]: 00 00000000 00000000

    Hit Result[5]: 00 00000000 00000000

    Hit Result[6]: 00 00000000 00000000

    Hit Result[7]: 00 E00004E8 40001A63

    Global Mask[10]: FF FFFFFFFF FFFFFFFF

    Global Mask[11]: FF FFFFFFFF FFFFFFFF

    Global Mask[12]: FF FFFFFFFF FFFFFFFF

    Global Mask[13]: FF FFFFFFFF FFFFFFFF

    Global Mask[14]: FF FFFFFFFF FFFFFFFF

    Global Mask[15]: FF FFFFFFFF FFFFFFFF

    Global Mask[16]: FF FFFFFFFF FFFFFFFF

    Global Mask[20]: FF FFFFFFFF FFFFFFFF

    Global Mask[21]: FF FFFFFFFF FFFFFFFF

    Global Mask[22]: FF FFFFFFFF FFFFFFFF

    Global Mask[23]: FF FFFFFFFF FFFFFFFF

    Global Mask[24]: FF FFFFFFFF FFFFFFFF

    Global Mask[25]: FF FFFFFFFF FFFFFFFF

    Global Mask[26]: FF FFFFFFFF FFFFFFFF

    Global Mask[27]: FF FFFFFFFF FFFFFFFF

    Global Mask[30]: FF FFFFFFFF FFFFFFFF

    Global Mask[31]: FF FFFFFFFF FFFFFFFF

    Global Mask[32]: FF FFFFFFFF FFFFFFFF

    Global Mask[33]: FF FFFFFFFF FFFFFFFF

  CAM 2:

    Revision: 00 00000000 00B30101

    Size: 00 00000000 00080040

    Device ID: 00 00000000 00000001

    Config: 00 00000000 B8000022

    ReplyID[0]: 00 01010101 01010101

    ReplyID[1]: 00 01010101 01010101

   ReplyID[2]: 00 01010101 01010101

   ReplyID[3]: 00 01010101 01010101

   Hit Result[0]: 00 00000000 00000000

   Hit Result[1]: 00 00000000 00000000

   Hit Result[2]: 00 00000000 00000000

   Hit Result[3]: 00 00000000 00000000

   Hit Result[4]: 00 00000000 00000000

   Hit Result[5]: 00 00000000 00000000

   Hit Result[6]: 00 00000000 00000000

   Hit Result[7]: 00 60003880 C00011D3

   Global Mask[10]: FF FFFFFFFF FFFFFFFF

   Global Mask[11]: FF FFFFFFFF FFFFFFFF

   Global Mask[12]: FF FFFFFFFF FFFFFFFF

   Global Mask[13]: FF FFFFFFFF FFFFFFFF

   Global Mask[14]: FF FFFFFFFF FFFFFFFF

   Global Mask[15]: FF FFFFFFFF FFFFFFFF

   Global Mask[16]: FF FFFFFFFF FFFFFFFF

   Global Mask[20]: FF FFFFFFFF FFFFFFFF

   Global Mask[21]: FF FFFFFFFF FFFFFFFF

   Global Mask[22]: FF FFFFFFFF FFFFFFFF

<output truncated>

show current

Use the show current VLAN configuration command to display the current VLAN database on the switch or a selected VLAN from it.

show current [vlan-id]

Syntax Description

vlan-id

(Optional) ID of the VLAN in the current database. If this variable is omitted, the entire VLAN database displays, included the pruning state and Version 2 mode. Valid IDs are from 1 to 1005; do not enter leading zeros.

Command Modes

VLAN configuration

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Examples

This is an example of output from the show current command. It displays the current VLAN database.

Switch(vlan)# show current

VLAN ISL Id: 1

    Name: default

    Media Type: Ethernet

    VLAN 802.10 Id: 100001

    State: Operational

    MTU: 1500

    Translational Bridged VLAN: 1002

    Translational Bridged VLAN: 1003

  VLAN ISL Id: 20

    Name: VLAN0020

    Media Type: Ethernet

    VLAN 802.10 Id: 100020

    State: Operational

    MTU: 1500

<output truncated>

VLAN ISL Id: 1002

    Name: fddi-default

    Media Type: FDDI

    VLAN 802.10 Id: 101002

    State: Operational

    MTU: 1500

    Bridge Type: SRB

    Translational Bridged VLAN: 1

    Translational Bridged VLAN: 10

VLAN ISL Id: 1003

    Name: token-ring-default

    Media Type: Token Ring

    VLAN 802.10 Id: 101003

    State: Operational

    MTU: 1500

    Bridge Type: SRB

    Ring Number: 0

    Bridge Number: 1

    Parent VLAN: 1005

    Maximum ARE Hop Count: 7

    Maximum STE Hop Count: 7

    Backup CRF Mode: Disabled

    Translational Bridged VLAN: 1

    Translational Bridged VLAN: 1002

VLAN ISL Id: 1004

    Name: fddinet-default

    Media Type: FDDI Net

    VLAN 802.10 Id: 101004

    State: Operational

    MTU: 1500

    Bridge Type: SRB

    Bridge Number: 1

    STP Type: IBM

  VLAN ISL Id: 1005

    Name: trnet-default

    Media Type: Token Ring Net

    VLAN 802.10 Id: 101005

    State: Operational

    MTU: 1500

    Bridge Type: SRB

    Bridge Number: 1

    STP Type: IBM 

This is an example of output from the show current 20 command. It displays only VLAN 20 of the current database.

Switch(vlan)# show current 20

Perdido1(vlan)#show current 20

  VLAN ISL Id: 20

    Name: VLAN0020

    Media Type: Ethernet

    VLAN 802.10 Id: 100020

    State: Operational

    MTU: 1500 

Related Commands

Command	Description
show changes	Displays the differences between the VLAN database currently on the switch and the proposed VLAN database.
show proposed	Displays the proposed VLAN database or a selected VLAN from it.

show dot1x

Use the show dot1x privileged EXEC command to display 802.1X statistics, administrative status, and operational status for the switch or for the specified interface.

show dot1x [statistics] [interface interface-id] [ | {begin | exclude | include} expression]

Syntax Description

statistics	(Optional) Display 802.1X statistics.
interface interface-id	(Optional) Display the 802.1X status for the specified port.
| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(8)EA1	This command was first introduced.

Usage Guidelines

If you do not specify an interface, global parameters and a summary are displayed. If you specify an interface, details for that interface are displayed.

If you specify the statistics keyword without the interface interface-id option, statistics are displayed for all interfaces. If you specify the statistics keyword with the interface interface-id option, statistics are displayed for the specified interface.

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

Examples

This is an example of output from the show dot1x privileged EXEC command:

Switch# show dot1x

Global 802.1X Parameters 

reauth-enabled               yes 

reauth-period               3600 

quiet-period                  60 

tx-period                     30 

supp-timeout                  30 

server-timeout                30 

reauth-max                     2 

max-req                        2

802.1X Port Summary 

Port Name                Status      Mode                Authorized          

Gi0/1                    disabled    n/a                 n/a                 

Gi0/2                    enabled     Auto (negotiate)    yes                 

Gi0/3                    disabled    n/a                 n/a                 

Gi0/4                    disabled    n/a                 n/a                 

Gi0/5                    disabled    n/a                 n/a                 

Gi0/6                    disabled    n/a                 n/a                 

Gi0/7                    disabled    n/a                 n/a                 

Gi0/8                    disabled    n/a                 n/a                 

Gi0/9                    disabled    n/a                 n/a                 

Gi0/10                   disabled    n/a                 n/a                 

Gi0/11                   disabled    n/a                 n/a                 

Gi0/12                   disabled    n/a                 n/a

802.1X Port Details

802.1X is disabled on GigabitEthernet0/1

802.1X is enabled on GigabitEthernet0/2

 Status                Unauthorized

 Port-control          Auto

 Supplicant            0060.b0f8.fbfb

 Multiple Hosts        Disallowed

 Current Identifier    2

Authenticator State Machine

 State               AUTHENTICATING

 Reauth Count        1

Backend State Machine

 State               RESPONSE

 Request Count       0

 Identifier (Server) 2

Reauthentication State Machine

 State               INITIALIZE

802.1X is disabled on GigabitEthernet0/3

802.1X is disabled on GigabitEthernet0/4

<output truncated>

---

Note In the previous display, the supp-timeout, server-timeout, and reauth-max values in the Global 802.1X Parameters section are not configurable. When relaying a request from the RADIUS authentication server to the client, the supp-timeout is the amount of time the switch waits for a response before it resends the request. When relaying a response from the client to the RADIUS authentication server, the server-timeout is the amount of time the switch waits for a reply before it resends the response. The reauth-max parameter is the maximum number of times that the switch tries to authenticate the client without receiving any response before the switch resets the port and restarts the authentication process.

---

In the 802.1X Port Summary section of the display, the Status column shows whether the port is enabled for 802.1X (the dot1x port-control interface configuration command is set to auto or force-unauthorized). The Mode column shows the operational status of the port; for example, if you configure the dot1x port-control interface configuration command to force-unauthorized, but the port has not transitioned to that state, the Mode column displays auto. If you disable 802.1X, the Mode column displays n/a.

The Authorized column shows the authorization state of the port. For information about port states, refer to the "Configuring 802.1X Port-Based Authentication" chapter in the Catalyst 3550 Multilayer Switch Software Configuration Guide.

This is an example of output from the show dot1x interface gigabitethernet0/2 privileged EXEC command. Table 2-13 describes the fields in the display.

Switch# show dot1x interface gigabitethernet0/2

802.1X is enabled on GigabitEthernet0/2 

  Status                Authorized 

  Port-control          Auto 

  Supplicant            0060.b0f8.fbfb 

  Multiple Hosts        Disallowed 

  Current Identifier    3

  Authenticator State Machine 

    State               AUTHENTICATED 

    Reauth Count        0

  Backend State Machine 

    State               IDLE 

    Request Count       0 

    Identifier (Server) 2

  Reauthentication State Machine 

    State               INITIALIZE

Table 2-13 show dot1x interface Field Description

Field	Description
802.1X is enabled on GigabitEthernet0/2
Status	Status of the port (authorized or unauthorized). The status of a port is displayed as authorized if the dot1x port-control interface configuration command is set to auto and has successfully completed authentication.
Port-control	Setting of the dot1x port-control interface configuration command.
Supplicant	Ethernet MAC address of the client, if one exists. If the switch has not discovered the client, this field displays Not set.
Multiple Hosts	Setting of the dot1x multiple-hosts interface configuration command (allowed or disallowed).
Current Identifier1	Each exchange between the switch and the client includes an identifier, which matches requests with responses. This number is incremented with each exchange and can be reset by the authentication server.

1 This field and the remaining fields in the display show internal state information. For a detailed description of these state machines and their settings, refer to the IEEE 802.1X specification.

This is an example of output from the show dot1x statistics interface gigabitethernet0/3 command. Table 2-14 describes the fields in the display.

Switch# show dot1x statistics interface gigabitethernet0/3

GigabitEthernet0/3

    Rx: EAPOL     EAPOL     EAPOL     EAPOL     EAP       EAP       EAP

        Start     Logoff    Invalid   Total     Resp/Id   Resp/Oth  LenError

        0         0         0         21        0         0         0

        Last      Last

        EAPOLVer  EAPOLSrc

        1         0002.4b29.2a03

    Tx: EAPOL     EAP       EAP

        Total     Req/Id    Req/Oth

        622       445       0 

Table 2-14 show dot1x statistics Field Descriptions 

Field	Description
RX EAPOL Start	Number of valid EAPOL-start frames that have been received
RX EAPOL Logoff	Number of EAPOL-logoff frames that have been received
RX EAPOL Invalid	Number of EAPOL frames that have been received and have an unrecognized frame type
RX EAPOL Total	Number of valid EAPOL frames of any type that have been received
RX EAP Resp/ID	Number of EAP-response/identity frames that have been received
RX EAP Resp/Oth	Number of valid EAP-response frames (other than response/identity frames) that have been received
RX EAP LenError	Number of EAPOL frames that have been received in which the packet body length field is invalid
Last EAPOLVer	Protocol version number carried in the most recently received EAPOL frame
LAST EAPOLSrc	Source MAC address carried in the most recently received EAPOL frame
TX EAPOL Total	Number of EAPOL frames of any type that have been sent
TX EAP Req/Id	Number of EAP-request/identity frames that have been sent
TX EAP Req/Oth	Number of EAP-request frames (other than request/identity frames) that have been sent

Related Commands

Command	Description
dot1x default	Resets the configurable 802.1X parameters to their default values.

show env

Use the show env privileged EXEC command to display fan and temperature information for the switch.

show env {all | fan | temperature} [ | {begin | exclude | include} expression]

Syntax Description

all	Display both fan and temperature environmental status.
fan	Display the switch fan status.
temperature	Display the switch temperature status.
| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

Examples

This is an example of output from the show env all command:

Switch# show env all

FAN is FAULTY

TEMPERATURE is OK 

This is an example of output from the show env fan command:

Switch# show env fan

FAN is OK

show errdisable detect

Use the show errdisable detect privileged EXEC command to display error-disable detection status.

show errdisable detect [ | {begin | exclude | include} expression]

Syntax Description

| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

Examples

This is an example of output from the show errdisable detect command:

Switch# show errdisable detect

ErrDisable Reason    Detection status

-----------------    ----------------

udld                 Enabled

bpduguard            Enabled

pagp-flap            Enabled

dtp-flap             Enabled

link-flap            Enabled

Related Commands

Command	Description
errdisable detect cause	Enables error disable detection for a specific cause or all causes.
show errdisable recovery	Displays error disable recovery timer information.
show errdisable flap-values	Displays error condition recognition information.
show interfaces status	Displays interface status or a list of interfaces in error-disabled state.

show errdisable flap-values

Use the show errdisable flap-values privileged EXEC command to display conditions that cause an error to be recognized for a cause.

show errdisable flap-values [ | {begin | exclude | include} expression]

Syntax Description

| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

The Flaps column in the display shows how many changes to the state within the specified time interval will cause an error to be detected and a port to be disabled. For example, the display shows that an error will be assumed and the port shut down if 5 link-state (link up/down) changes occur during a 10-second interval, or if 3 DTP-state (port mode access/trunk) changes occur during a 30-second interval.

ErrDisable Reason    Flaps    Time (sec)

-----------------    ------   ----------

dtp-flap               3       30

link-flap              5       10

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

Examples

This is an example of output from the show errdisable flap-values command:

Switch# show errdisable flap-values

ErrDisable Reason    Flaps    Time (sec)

-----------------    ------   ----------

pagp-flap              3       30

dtp-flap               3       30

link-flap              5       10

Related Commands

Command	Description
errdisable detect cause	Enables error disable detection for a specific cause or all causes.
show errdisable detect	Displays error disable detection status.
show errdisable recovery	Displays error disable recovery timer information.
show interfaces status	Displays interface status or a list of interfaces in error-disabled state.

show errdisable recovery

Use the show errdisable recovery privileged EXEC command to display the error-disable recovery timer information.

show errdisable recovery [ | {begin | exclude | include} expression]

Syntax Description

| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

Examples

This is an example of output from the show errdisable recovery command:

Switch# show errdisable recovery

ErrDisable Reason    Timer Status

-----------------    --------------

udld                 Enabled

bpduguard            Enabled

channel-misconfig    Disabled

pagp-flap            Enabled

dtp-flap             Enabled

link-flap            Enabled

Timer interval:300 seconds

Interfaces that will be enabled at the next timeout:

Interface    Errdisable reason    Time left(sec)

---------    -----------------    --------------

Gi0/4           link-flap             279 

Related Commands

Command	Description
errdisable recovery	Configures the recover mechanism variables.
show errdisable detect	Displays error disable detection status.
show errdisable flap-values	Displays error condition recognition information.
show interfaces status	Displays interface status or a list of interfaces in error-disabled state.

show etherchannel

Use the show etherchannel privileged EXEC command to display EtherChannel information for a channel.

show etherchannel [channel-group-number] {brief | detail | load-balance | port | port-channel | summary} [ | {begin | exclude | include} expression]

Syntax Description

channel-group-number	(Optional) Number of the channel group. Valid numbers range from 1 to 64.
brief	Display a summary of EtherChannel information.
detail	Display detailed EtherChannel information.
load-balance	Display the load-balance or frame-distribution scheme among ports in the port channel.
port	Display EtherChannel port information.
port-channel	Display port-channel information.
summary	Display a one-line summary per channel-group.
| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

If you do not specify a channel-group, all channel groups are displayed.

In the output, the Passive port list field is displayed only for Layer 3 port channels. This field means that the physical interface, which is still not up, is configured to be in the channel group (and indirectly is in the only port channel in the channel group).

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

Examples

This is an example of output from the show etherchannel 1 detail command:

Switch# show etherchannel 1 detail

Group state = L2 

Ports: 2   Maxports = 8 

Port-channels: 1 Max Port-channels = 1

                Ports in the group:

                -------------------

Port: Gi0/1

------------

Port state    = Up Mstr In-Bndl 

Channel group = 1           Mode = Desirable-Sl     Gcchange = 0

Port-channel  = Po1         GC   = 0x00010001    Pseudo port-channel = Po1

Port index    = 0           Load = 0x00

Flags:  S - Device is sending Slow hello.  C - Device is in Consistent state.

        A - Device is in Auto mode.        P - Device learns on physical port.

        d - PAgP is down.

Timers: H - Hello timer is running.        Q - Quit timer is running.

        S - Switching timer is running.    I - Interface timer is running.

Local information:

                                Hello    Partner  PAgP     Learning  Group

Port      Flags State   Timers  Interval Count   Priority   Method  Ifindex

Gi0/1     SC    U6/S7   H       30s      1        128        Any      16

Partner's information:

          Partner              Partner          Partner         Partner Group

Port      Name                 Device ID        Port       Age  Flags   Cap.

Gi0/1     vegas-p2             0002.4b29.4600   Gi0/1        9s SC      10001 

Age of the port in the current state: 00d:00h:07m:52s

Port: Gi0/2

------------

Port state    = Up Mstr In-Bndl 

Channel group = 1           Mode = Desirable-Sl     Gcchange = 0

Port-channel  = Po1         GC   = 0x00010001    Pseudo port-channel = Po1

Port index    = 0           Load = 0x00

Flags:  S - Device is sending Slow hello.  C - Device is in Consistent state.

        A - Device is in Auto mode.        P - Device learns on physical port.

        d - PAgP is down.

Timers: H - Hello timer is running.        Q - Quit timer is running.

        S - Switching timer is running.    I - Interface timer is running.

Local information:

                                Hello    Partner  PAgP     Learning  Group

Port      Flags State   Timers  Interval Count   Priority   Method  Ifindex

Gi0/2     SC    U6/S7   H       30s      1        128        Any      16

Partner's information:

          Partner              Partner          Partner         Partner Group

Port      Name                 Device ID        Port       Age  Flags   Cap.

Gi0/2     vegas-p2             0002.4b29.4600   Gi0/2        4s SC      10001 

Age of the port in the current state: 00d:00h:07m:55s

                Port-channels in the group: 

                ----------------------

Port-channel: Po1

------------

Age of the Port-channel   = 00d:00h:08m:28s

Logical slot/port   = 1/0           Number of ports = 2

GC                  = 0x00010001      HotStandBy port = null

Port state          = Port-channel Ag-Inuse 

Ports in the Port-channel: 

Index   Load   Port    EC state

------+------+------+------------

  0     00     Gi0/1    desirable-sl  

  0     00     Gi0/2    desirable-sl  

Time since last port bundled:    00d:00h:07m:56s    Gi0/1

This is an example of output from the show etherchannel 1 summary command:

Switch# show etherchannel 1 summary

Flags:  D - down        P - in port-channel

        I - stand-alone s - suspended

        R - Layer3      S - Layer2

        U - port-channel in use

Group Port-channel  Ports

-----+------------+-----------------------------------------------------------

1     Po1(SU)     Gi0/1(P)   Gi0/2(P) 

This is an example of output from the show etherchannel 1 brief command:

Switch# show etherchannel 1 brief

Group state = L2 

Ports: 2   Maxports = 8 

Port-channels: 1 Max Port-channels = 1

This is an example of output from the show etherchannel 1 port-channel command:

Switch# show etherchannel 1 port-channel 

Port-channels in the group: 

                ----------------------

Port-channel: Po1

------------

Age of the Port-channel   = 00d:00h:10m:41s

Logical slot/port   = 1/0           Number of ports = 2

GC                  = 0x00010001      HotStandBy port = null

Port state          = Port-channel Ag-Inuse 

Ports in the Port-channel: 

Index   Load   Port    EC state

------+------+------+------------

  0     00     Gi0/1    desirable-sl  

  0     00     Gi0/2    desirable-sl  

Time since last port bundled:    00d:00h:10m:08s    Gi0/1

This is an example of output from the show etherchannel 1 port command:

Switch# show etherchannel 1 port

Port: Gi0/1

------------

Port state    = Up Mstr In-Bndl 

Channel group = 1           Mode = Desirable-Sl     Gcchange = 0

Port-channel  = Po1         GC   = 0x00010001    Pseudo port-channel = Po1

Port index    = 0           Load = 0x00

Flags:  S - Device is sending Slow hello.  C - Device is in Consistent state.

        A - Device is in Auto mode.        P - Device learns on physical port.

        d - PAgP is down.

Timers: H - Hello timer is running.        Q - Quit timer is running.

        S - Switching timer is running.    I - Interface timer is running.

Local information:

                                Hello    Partner  PAgP     Learning  Group

Port      Flags State   Timers  Interval Count   Priority   Method  Ifindex

Gi0/1     SC    U6/S7   H       30s      1        128        Any      16

Partner's information:

          Partner              Partner          Partner         Partner Group

Port      Name                 Device ID        Port       Age  Flags   Cap.

Gi0/1     vegas-p2             0002.4b29.4600   Gi0/1       21s SC      10001 

Age of the port in the current state: 00d:00h:09m:02s

Port: Gi0/2

------------

Port state    = Up Mstr In-Bndl 

Channel group = 1           Mode = Desirable-Sl     Gcchange = 0

Port-channel  = Po1         GC   = 0x00010001    Pseudo port-channel = Po1

Port index    = 0           Load = 0x00

Flags:  S - Device is sending Slow hello.  C - Device is in Consistent state.

        A - Device is in Auto mode.        P - Device learns on physical port.

        d - PAgP is down.

Timers: H - Hello timer is running.        Q - Quit timer is running.

        S - Switching timer is running.    I - Interface timer is running.

Local information:

                                Hello    Partner  PAgP     Learning  Group

Port      Flags State   Timers  Interval Count   Priority   Method  Ifindex

Gi0/2     SC    U6/S7   H       30s      1        128        Any      16

Partner's information:

          Partner              Partner          Partner         Partner Group

Port      Name                 Device ID        Port       Age  Flags   Cap.

Gi0/2     vegas-p2             0002.4b29.4600   Gi0/2       21s SC      10001 

Age of the port in the current state: 00d:00h:09m:04s

Related Commands

Command	Description
channel-group	Assigns an Ethernet interface to an EtherChannel group.
interface port-channel	Accesses or creates the port channel.

show fm interface

Use the show fm interface privileged EXEC command to display per-interface feature-manager information. Use it with the show fm label command to determine which features were able to fit into the hardware.

show fm interface interface-id | [ | {begin | exclude | include} expression]

Syntax Description

interface-id	Specify an interface; valid interfaces include: •physical interface—type and port number. •port channel—port-channel port-channel-number (1 to 64). •null—null 0. •VLAN—vlan vlan-id (1 to 1001). VLAN interfaces are VLANs that have a switch virtual interface (SVI) assigned.
| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

Examples

This is an example of output from the show fm interface gigabitethernet0/12 command:

Switch# show fm interface gigabitethernet0/12

Input Label: 0 (default)

Output Label: 0 (default)

Priority: normal

Related Commands

Command	Description
show fm vlan	Displays per-VLAN feature manager information.
show fm label	Displays feature-manager information for a specified label and lists features associated with that label that were not able to fit into the hardware.

show fm label

Use the show fm label privileged EXEC command to display feature-manager information for a specified label to list features associated with that label that were not able to fit in the hardware.

show fm label label-number [ | {begin | exclude | include} expression]

Syntax Description

label-number	Label number from 0 to 255
| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

An unloaded indicator in the output means that the feature was not loaded in the hardware. To allocate more system resources to maximize the number of security ACLs that can fit in the hardware, you can use the sdm prefer access global configuration command to set the Switch Database Management feature to the access template.

If the output shows a merge failure, using the sdm prefer access command has no effect.

Examples

This is an example of output from the show fm label command when there has been a merge failure on an input access-group:

Switch# show fm label 1

Unloaded due to merge failure or lack of space:

  InputAccessGroup 

  Merge Fail:input

Input Features:

  Interfaces or VLANs: Vl1

  Priority:normal

  Vlan Map:(none)

  Access Group:131, 6788 VMRs

  Multicast Boundary:(none), 0 VMRs

Output Features:

  Interfaces or VLANs:

  Priority:low

  Bridge Group Member:no

  Vlan Map:(none)

  Access Group:(none), 0 VMRs

This is an example of output from the show fm label command when there was not enough room for an input access group in the hardware:

Switch# show fm label 1

Unloaded due to merge failure or lack of space:

  InputAccessGroup 

Input Features:

  Interfaces or VLANs: Vl1

  Priority:normal

  Vlan Map:(none)

  Access Group:bigone, 11 VMRs

  Multicast Boundary:(none), 0 VMRs

Output Features:

  Interfaces or VLANs:

  Priority:low

  Bridge Group Member:no

  Vlan Map:(none)

  Access Group:(none), 0 VMRs

This is an example of output from the show fm label command when there was not enough room for the input access group or the output access group on the label. Note that the access groups were configured on two different interfaces. Labels are assigned independently for input and output.

Switch# show fm label 1

Unloaded due to merge failure or lack of space:

  InputAccessGroup OutputAccessGroup 

Input Features:

  Interfaces or VLANs: Vl1

  Priority:normal

  Vlan Map:(none)

  Access Group:bigone, 11 VMRs

  Multicast Boundary:(none), 0 VMRs

Output Features:

  Interfaces or VLANs: Vl2

  Priority:normal

  Bridge Group Member:no

  Vlan Map:(none)

  Access Group:bigtwo, 11 VMRs

Related Commands

Command	Description
show fm interface	Displays per-interface feature manager information.
show fm vlan	Displays per-VLAN feature manager information.

show fm vlan

Use the show fm vlan privileged EXEC command to display per-VLAN feature-manager information. Use with the show fm label command to determine which features were able to fit into the hardware.

show fm vlan vlan-id [ | {begin | exclude | include} expression]

Syntax Description

vlan-id	Any VLAN ID, whether or not a switch virtual interface (SVI) has been assigned. The range is 1 to 1001.
| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

Examples

This is an example of output from the show fm vlan 1 command. It displays the label used in hardware for VLAN feature configuration.

Switch# show fm vlan 1

Input Label: 0 (default)

Output Label: 0 (default)

Priority: normal

Related Commands

Command	Description
show fm interface	Displays per-interface feature manager information.
show fm label	Displays feature-manager information for a specified label and lists features associated with that label that were not able to fit into the hardware.

show forward

Use the show forward privileged EXEC command for an interface to determine how the hardware would forward a frame that matches the specified parameters.

show forward interface-id [vlan vlan-id] src-mac dst-mac [ex-class] [ex-l4op] [ex-qos] [ex-sig] [ | {begin | exclude | include} expression]

show forward interface-id [vlan vlan-id] src-mac dst-mac [ip src-ip dst-ip [option] [frag fragment] [dscp dscp] {protocol-num | {icmp icmp-type icmp-code} | {igmp igmp-version igmp-type} | {tcp src-port dst-port flags} | {udp src-port dst-port}}] [ex-class] [ex-l4op] [ex-qos] [ex-sig] [ | {begin | exclude | include} expression]

show forward interface-id [vlan vlan-id] src-mac dst-mac sap lsap [cos cos] [ex-class] [ex-l4op] [ex-qos] [ex-sig] [ | {begin | exclude | include} expression]

show forward interface-id [vlan vlan-id] src-mac dst-mac snap ethertype [cos cos] [ex-class] [ex-l4op] [ex-qos] [ex-sig] [ | {begin | exclude | include} expression]

Syntax Description

interface-id	The input physical interface.
vlan vlan-id	(Optional) Input VLAN ID. The range is 1 to 1001. If not specified, and the input interface is not a routed port, the default is 1. You should specify the input VLAN even for access ports.
src-mac	48-bit source MAC address.
dst-mac	48-bit destination MAC address.
ex-class	(Optional) Display detailed packet processing information related to classification.
ex-l4op	(Optional) Display detailed packet processing information related to Layer 4 operations.
ex-qos	(Optional) Display detailed packet processing information related to quality of service (QoS).
ex-sig	(Optional) Display detailed packet processing information related to the part of the hardware that recognizes frame formats (signature tables).
ip src-ip dst-ip	(Optional) Source and destination IP addresses in dotted decimal notation.
option	(Optional) Keyword signifying IP options are present in the packet.
dscp dscp	(Optional) Differentiated services code point (DSCP) field in the IP header. The range is 0 to 63.
frag fragment	(Optional) Two-byte IP fragment field in the IP header. This field includes the Don't Fragment bit (0x4000), the More Fragments bit (0x2000), and the Fragment Offset (0x0 through 0x1FFF). The default is 0x0 (unfragmented packet).
protocol-num	The numeric value of the protocol field in the IP header. The range is 0 to 255. For example, 47 is generic routing encapsulation (GRE), 89 is Open Shortest Path First (OSPF). If is TCP, UDP, ICMP, or IGMP, you should use the appropriate keyword instead of a numeric value.
icmp icmp-type icmp-code	Internet Control Message Protocol (ICMP) parameters. The icmp-type and icmp-code ranges are 0 to 255.
igmp igmp-version igmp-type	Internet Group Management Protocol (IGMP) parameters. The igmp-version and igmp-type ranges are 0 to 255.
tcp src-port dst-port flags	Transmission Control Protocol (TCP) parameters: TCP source port, destination port, and the numeric value of the TCP flags byte. The src-port and dst-port ranges are 0 to 65535.
udp src-port dst-port	User Datagram Protocol (UDP) parameters. The src-port and dst-port ranges are 0 to 65535.
cos cos	(Optional) Class of service (CoS) value of the frame. The range is 0 to 1024.
snap ethertype	(Optional) Subnetwork Access Protocol (SNAP) encapsulation type and the Ethertype field. The range is 0 to 65535.
sap lsap	(Optional) Service access point (SAP) encapsulation type and the LSAP field. The range is 0 to 65535.
| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

If you enter this command without any arguments, you enter a dialog mode. This mode is not operational in this release.

Because of the many and varied items that go into the forwarding decision, this command requires detailed information about the frame in order to correctly indicate how the hardware would forward the frame.

This command has limited ability to account for QoS settings. It does not take into account any packet arrival rates, so if the system has been configured to mark down or police traffic based on data arrival rates, the command will display inaccurate information for traffic that exceeds the configured rates.

If QoS or ACLs are not configured, and if no port-channel interfaces are present, the most important parameters to specify are source interface, source VLAN, destination MAC address, and destination IP address (if applicable). The output is likely to be accurate, even if other parameters are missing or estimated.

If port channel interfaces are present, it is important to specify the source MAC address and IP address correctly.

If ACLs are present, all keywords in the command could be important to the forwarding decision.

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

Examples

Following are three examples of outputs from the show forward command. Table 2-15 describes the major sections in the output display.

In this example, the destination MAC address is the router's MAC address and routing lookups are performed.

Switch# show forward fastethernet0/8 vlan 8 0000.1111.2222 0022.3355.8800 ip 8.8.8.10 
4.4.4.33 255

signature:00000007, comparison ind:10, control info:2000941A control map:00000000

vlan:8, vlanid entry:000C0012 00000000 00000000 04400000

adjptr:D  adjacency:E0002409 00000404 04210000

vlan:1033, vlanid entry:0004000A 00000000 00000000 00000000

vlan:1033, vlanid entry:0004000A 00000000 00000000 00000000

lookup  key                                   bk adata    rawoff secoff sec

qos     960808080A04040421 800000000000FF0000 0  00000000 006304 004064  4

acl     960808080A04040421 800000000000FF0000 1  00000082 045408 002016  1

route   420808080A04040421 000000000000000000 0  3FFF800D 006361 000025  3

learn   187008000011112222 901208000004040421 0  80010003 002176 002176  0

forw    187008000011112222 901208000004040421 1  40020000 043328 010560  5

outacli A60808080A04040421 800000000000FF0000 0  00000083 012448 002016  2

bridgeDestMap:  00000000 00000000 0000FFFF FFFFFFC7

vlanMask:       00000000 00000000 0000FFFF EFFFFFFF

sourceMask:     00000000 00000000 00000000 00000000

globalMap:      00000000 00000000 00000000 00000000

globalMask:     00000000 00000000 0002FFFF EFFFFC03

forwMap:        00000000 00000000 00000000 10000000

frame notifies:

src u_dat vlan fl q-map

2   00    8    01 00000000 00000000 00000000 10000000

Egress q 44

signature:00000007, comparison ind:10, control info:2000941A control map:00000000

vlan:8, vlanid entry:000C0012 00000000 00000000 00000000

adjptr:D  adjacency:E0002409 00000404 04210000

vlan:1033, vlanid entry:0004000A 00000000 88000000 00000000

lookup  key                                   bk adata    rawoff secoff sec

route   420808080A04040421 000000000000000000 0  3FFF800D 006361 000025  3

GigabitEthernet0/1 vlan 1033, dst 0000.0404.0421 src 0022.3355.8800, cos 0x0, dscp 0x0

In this example, the destination MAC address is not the router's MAC address. No routing lookups are performed.

Switch# show forward fa0/8 vlan 8 0000.1111.2222 0022.3355.9800 ip 8.8.8.10 4.4.4.33 255

signature:00000007, comparison ind:10, control info:2000941A control map:00000000

vlan:8, vlanid entry:000C0012 00000000 00000000 04620000

vlan:8, vlanid entry:000C0012 00000000 00000000 04620000

lookup  key                                   bk adata    rawoff secoff sec

qos     940808080A04040421 800000000000FF0000 0  00000000 006304 004064  4

acl     940808080A04040421 800000000000FF0000 1  00000082 045408 002016  1

learn   187008000011112222 801008002233559800 0  80010003 002176 002176  0

forw    187008000011112222 801008002233559800 1  40020000 043328 010560  5

bridgeDestMap:  00000000 00000000 0000FFFF FFFFFFC7

vlanMask:       00000000 00000000 0000FFFF FFFFFE7F

portMask:       00000000 00000000 00000000 00000080

sourceMask:     00000000 00000000 00000000 00000000

globalMap:      00000000 00000000 00000000 00000000

globalMask:     00000000 00000000 0002FFFF EFFFFC03

forwMap:        00000000 00000000 00000000 00000100

frame notifies:

src u_dat vlan fl q-map

2   00    8    00 00000000 00000000 00000000 00000100

Egress q 8

signature:00000007, comparison ind:10, control info:2000941A control map:00000000

vlan:8, vlanid entry:000C0012 00000000 00000000 04620000

FastEthernet0/9 vlan 8, dst 0022.3355.9800 src 0000.1111.2222, cos 0x0, dscp 0x0

This is an example of the display that results if one of the destinations for the packet is the switch CPU. Note that in this case the section after the frame notifies section is labeled Cpu q and that a queue name is displayed.

Switch# show forward fa0/7 vlan 7 0000.1111.2222 0022.3355.8800 ip 1.1.1.1 7.7.7.1 255

signature:00000007, comparison ind:11, control info:2000941A control map:00000000

vlan:7, vlanid entry:000C0011 00000000 00318C60 88000000

adjptr:0  adjacency:00000000 00000000 0000C000

vlan:7, vlanid entry:000C0011 00000000 00318C60 88000000

lookup  key                                   bk adata    rawoff secoff sec

qos     960101010107070701 800000000000FF0000 0  00000000 006304 004064  4

acl     960101010107070701 800000000000FF0000 1  00000082 045408 002016  1

route   420101010107070701 000000000000000000 0  00048000 006345 000009  3

learn   186007000011112222 800E08002233558800 0  80010003 002176 002176  0

forw    186007000011112222 800E08002233558800 1  40090000 033000 000232  5

bridgeDestMap:  00000000 00000000 00000000 00000000

routeDestMap:   00000000 00000000 00100000 00000000

sourceMask:     00000000 00000000 00000000 00000000

globalMap:      00000000 00000000 00000000 00000000

globalMask:     00000000 00000000 0002FFFF EFBFFC03

forwMap:        00000000 00000000 00100000 00000000

frame notifies:

src u_dat vlan fl q-map

2   00    7    01 00000000 00000000 00100000 00000000

Cpu q:100 - routing queue

Table 2-15 show forward Output Description  

Output Section	Description
General (no heading) Includes the first few lines of the display.	Displays lookup results for several tables in the input portion of the hardware. The output includes packet formats, the configuration of the input VLAN, and other information.
lookup section	Describes TCAM lookups performed during the input forwarding decision and the results of these lookups.
Bitmaps and masks	Displays maps and masks used to calculate the final set of forwarding destinations.
frame notifies section	Contains the bitmap that results from combining the maps and masks from the bitmaps section. If SPAN is configured, there might be additional bitmaps displayed.
Egress q <nn> section	There is an egress section for each separate destination port. The output is varied, but the important information is in the line containing the name of an output interface, output VLAN ID, and rewritten destination MAC address for the frame. If the output interface is a trunk port that needs to transmit multiple copies of the frame on different VLANs (for example, for IP multicast frames), several lines might contain the same output interface name, but a different output VLANs. If output security ACLs are present, it is possible that one or more of these egress q sections will not contain a line listing an output port. This happens when the output ACL denies the packet.
Cpu q <nn> <name> section	When the CPU is one of the destinations for a packet, this section is displayed, followed by a queue name. This name should correspond to one of the queue names in the output from the show controllers cpu-interface privileged EXEC command, where statistics are displayed for the number of packets received at each queue.

show interfaces

Use the show interfaces privileged EXEC command to display the administrative and operational status of all interfaces or a specified interface.

show interfaces [interface-id | vlan vlan-id] [description | etherchannel | pruning | status [err-disabled] | switchport | trunk] [ | {begin | exclude | include} expression]

Syntax Description

interface-id	(Optional) ID of the physical interface, including type, slot, and port number.
vlan vlan-id	(Optional) VLAN identification. Valid IDs are from 1 to 1005. Do not enter leading zeros.
description	(Optional) Display the administrative status and description set for an interface.
etherchannel	(Optional) Display interface EtherChannel information.
pruning	(Optional) Display interface trunk VTP pruning information.
status	(Optional) Display the status of the interface.
err-disabled	(Optional) Display interfaces in error-disabled state.
switchport	(Optional) Display the administrative and operational status of a switching (nonrouting) port, including port blocking and port protection settings.
trunk	Display interface trunk information. If you do not specify an interface, information for only active trunking ports is displayed.
| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

Examples

This is an example of output from the show interfaces gigabitethernet0/1 command.

Switch# show interfaces gigabitethernet0/1 

GigabitEthernet0/1 is up, line protocol is up

  Hardware is Gigabit Ethernet, address is 0002.4b29.4401 (bia 0002.4b29.4401)

  MTU 1500 bytes, BW 100000 Kbit, DLY 10 usec,

     reliability 255/255, txload 1/255, rxload 1/255

  Encapsulation ARPA, loopback not set

  Keepalive set (10 sec)

  Half-duplex, 100Mb/s

  input flow-control is off, output flow-control is off

  ARP type: ARPA, ARP Timeout 04:00:00

  Last input 00:00:00, output 00:00:08, output hang never

  Last clearing of "show interface" counters never

  Queueing strategy: fifo

  Output queue 0/40, 0 drops; input queue 0/75, 0 drops

  5 minute input rate 1000 bits/sec, 2 packets/sec

  5 minute output rate 0 bits/sec, 0 packets/sec

     7122 packets input, 783062 bytes, 0 no buffer

     Received 5137 broadcasts, 0 runts, 0 giants, 0 throttles

     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

     0 input packets with dribble condition detected

     9222 packets output, 2188728 bytes, 0 underruns

     0 output errors, 0 collisions, 2 interface resets

     0 babbles, 0 late collision, 1 deferred

     0 lost carrier, 0 no carrier

     0 output buffer failures, 0 output buffers swapped out 

This is an example of output from the show interfaces gigabitethernet0/4 description command when the interface has been described as Connects to Marketing by using the description interface configuration command.

Switch# show interfaces gigabitethernet0/4 description

Interface Status         Protocol Description

G10/4     up             down     Connects to Marketing

This is an example of output from the show interfaces gigabitethernet0/9 pruning command when pruning is enabled in the VTP domain:

Switch# show interfaces gigibitethernet0/9 pruning

Port    Vlans pruned for lack of request by neighbor

Gi0/9   3,4

Port    Vlans traffic requested of neighbor

Gi0/9   1-3

This is an example of output from the show interfaces status command. It displays the status of all interfaces.

Switch# show interfaces status

Port    Name               Status       Vlan       Duplex  Speed Type

Gi0/1   CubeA              connected    1          a-full  a-100 10/100/1000Base TX

Gi0/2   CubeC              notconnect   1            auto   auto 10/100/1000Base TX

Gi0/3   CubeE              disabled     1            auto   auto 10/100/1000Base TX

Gi0/4   CubeG              notconnect   1            auto   auto 10/100/1000Base TX

Gi0/5   CubeI              notconnect   routed       auto   auto 10/100/1000Base TX

Gi0/6   CubeK              notconnect   routed       auto   auto 10/100/1000Base TX

Gi0/7   CubeM              notconnect   1            auto   auto 10/100/1000Base TX

This is an example of output from the show interfaces etherchannel command when port channels are configured on the switch:

Switch# show interfaces etherchannel

----

GigabitEthernet0/9:

Port state    = Down Not-in-Bndl

Channel group = 6           Mode = Desirable-Sl     Gcchange = 0

Port-channel  = null        GC   = 0x00000000    Pseudo port-channel = Po6

Port index    = 0           Load = 0x00

Flags:  S - Device is sending Slow hello.  C - Device is in Consistent state.

        A - Device is in Auto mode.        P - Device learns on physical port.

        d - PAgP is down.

Timers: H - Hello timer is running.        Q - Quit timer is running.

        S - Switching timer is running.    I - Interface timer is running.

Local information:

                                Hello    Partner  PAgP     Learning  Group

Port      Flags State   Timers  Interval Count   Priority   Method  Ifindex

Gi0/9     d     U1/S1           1s       0        128        Any      0

Age of the port in the current state: 14d:12h:32m:05s

----

GigabitEthernet0/10:

Port state    = Up Sngl-port-Bndl Mstr Not-in-Bndl

Channel group = 10          Mode = Desirable-Sl     Gcchange = 0

Port-channel  = null        GC   = 0x000A0001    Pseudo port-channel = Po10

Port index    = 0           Load = 0x00

Flags:  S - Device is sending Slow hello.  C - Device is in Consistent state.

        A - Device is in Auto mode.        P - Device learns on physical port.

        d - PAgP is down.

Timers: H - Hello timer is running.        Q - Quit timer is running.

        S - Switching timer is running.    I - Interface timer is running.

Local information:

                                Hello    Partner  PAgP     Learning  Group

Port      Flags State   Timers  Interval Count   Priority   Method  Ifindex

Gi0/10          U4/S4   H       30s      0        128        Any      0

Age of the port in the current state: 01d:06h:05m:59s

----

Port-channel6:

Age of the Port-channel   = 01d:06h:05m:38s

Logical slot/port   = 1/1           Number of ports = 0

GC                  = 0x00000000      HotStandBy port = null

Port state          = Port-channel Ag-Not-Inuse

----

Port-channel10:

Age of the Port-channel   = 01d:06h:06m:15s

Logical slot/port   = 1/0           Number of ports = 0

GC                  = 0x00000000      HotStandBy port = null

Port state          = Port-channel Ag-Not-Inuse

This is an example of output from the show interfaces status err-disabled command. It displays the status of interfaces in error-disabled state.

Switch# show interfaces status err-disabled 

Port    Name               Status       Reason

Gi0/4                      notconnect   link-flap

informational error message when the timer expires on a cause

--------------------------------------------------------------

5d04h:%PM-SP-4-ERR_RECOVER:Attempting to recover from link-flap err-disable state on Gi0/4

This is an example of output from the show interfaces switchport command. It displays switch port information for all switching ports. Table 2-16 describes the fields in the display.

Switch# show interfaces switchport

Name: Gi0/1

Switchport: Enabled

Administrative Mode: dynamic desirable

Operational Mode: static access

Administrative Trunking Encapsulation: negotiate

Operational Trunking Encapsulation: native

Negotiation of Trunking: On

Access Mode VLAN: 1 (default)

Trunking Native Mode VLAN: 1 (default)

Trunking VLANs Enabled: ALL

Pruning VLANs Enabled: 2-1001

Protected: True

Unknown unicast blocked: disabled

Unknown multicast blocked: disabled

Name: Gi0/2

Switchport: Enabled

Administrative Mode: dynamic desirable

Operational Mode: down

Administrative Trunking Encapsulation: negotiate

Negotiation of Trunking: On

Access Mode VLAN: 1 (default)

Trunking Native Mode VLAN: 1 (default)

Trunking VLANs Enabled: ALL

Pruning VLANs Enabled: 2-1001

Protected: True

Unknown unicast blocked: disabled

Unknown multicast blocked: disabled

<output truncated>

Table 2-16 show interfaces switchport Field Descriptions 

Field	Description
Name	Displays the port name.
Switchport	Displays the administrative and operational status of the port. In this display, the port is in switchport mode.
Administrative Mode Operational Mode	Displays the administrative and operational mode.
Administrative Trunking Encapsulation Operation Trunking Encapsulation Negotiation of Trunking	Displays the administrative and operational encapsulation method, and whether trunking negotiation is enabled.
Access Mode VLAN	Displays the VLAN ID to which the port is configured.
Trunking Native Mode VLAN Trunking VLANs Enabled Trunking VLANs Active	Lists the VLAN ID of the trunk that is in native mode. Lists the allowed VLANs on the trunk. Lists the active VLANs on the trunk.
Pruning VLANs Enabled	Lists the VLANs that are pruning-eligible.
Priority for untagged frames	Displays the port priority on incoming untagged frames.
Protected	Displays whether or not protected port is enabled (True) or disabled (False) on the interface.
Unknown unicast blocked Unknown multicast blocked	Displays whether or not unknown multicast and unknown unicast traffic is blocked on the interface.

This is an example of output from the show interfaces gigabitethernet0/1 trunk command. It displays trunking information for the interface.

Switch# show interfaces gigabitethernet0/1 trunk

Port      Mode         Encapsulation  Status        Native vlan

Gi0/1     desirable    negotiate      not-trunking  1

Port      Vlans allowed on trunk

Gi0/1     1

Port      Vlans allowed and active in management domain

Gi0/1     1

Port      Vlans in spanning tree forwarding state and not pruned

Gi0/1     1 

Related Commands

Command	Description
switchport access	Configures a port as a static-access or dynamic-access port.
switchport block	Blocks unknown unicast or multicast traffic on an interface.
switchport broadcast	Configures the VLAN membership mode of a port.
switchport protected	Isolates unicast, multicast, and broadcast traffic at Layer 2 from other protected ports on the same switch.
switchport trunk pruning	Configures the VLAN pruning-eligible list for ports in trunking mode.

show interfaces counters

Use the show interfaces counters privileged EXEC command to display various counters for the switch or for a specific interface.

show interfaces [interface-id | vlan vlan-id] counters [broadcast | errors | multicast | trunk | unicast] [ | {begin | exclude | include} expression]

Syntax Description

interface-id	(Optional) ID of the physical interface, including type and slot and port number.
vlan vlan-id	(Optional) VLAN number of the management VLAN. Valid IDs are from 1 to 1001. Do not enter leading zeros.
broadcast	(Optional) Display discarded broadcast traffic.
errors	(Optional) Display error counters.
multicast	(Optional) Display discarded multicast traffic.
trunk	(Optional) Display trunk counters.
unicast	(Optional) Display discarded unicast traffic.
| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

If you do not enter any keywords, all counters for all interfaces are included.

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

Examples

This is an example of output from the show interfaces counters command. It displays all counters for the switch.

Switch# show interfaces counters

Port            InOctets   InUcastPkts   InMcastPkts   InBcastPkts

Gi0/1           23324617         10376        185709        126020

Gi0/2                  0             0             0             0

Port           OutOctets  OutUcastPkts  OutMcastPkts  OutBcastPkts

Gi0/1            4990607         28079         21122            10

Gi0/2            1621568         25337             0             0

This is an example of output from the show interfaces counters broadcast command. It displays dropped broadcast traffic for all interfaces.

Switch# show interfaces counters broadcast

Port      BcastSuppDiscards

Gi0/1                     1

Gi0/2                     0

This is an example of output from the show interfaces gigabitethernet0/1 counters broadcast command. It displays dropped broadcast traffic for the interface.

Switch# show interfaces gigabitethernet0/1 counters broadcast

Port      BcastSuppDiscards

Gi0/1                     0 

This is an example of output from the show interfaces counters errors command. It displays interface error counters for all interfaces.

Switch# show interfaces counters errors

Port        Align-Err    FCS-Err   Xmit-Err    Rcv-Err UnderSize

Gi0/1               0          0          0          0         0

Gi0/2               0          0          0          0         0

Gi0/3               0          0          0          0         0

Gi0/4               0          0          0          0         0

Port      Single-Col Multi-Col  Late-Col Excess-Col Carri-Sen     Runts    Giants

Gi0/1              0         0         0          0         0         0      0

Gi0/2              0         0         0          0         0         0      0

Gi0/3              0         0         0          0         0         0      0

Gi0/4              0         0         0          0         0         0      0

This is an example of output from the show interfaces counters multicast command. It displays dropped multicast traffic for all interfaces.

Switch# show interfaces counters multicast

Port      McastSuppDiscards

Gi0/1                     0

Gi0/2                     0

This is an example of output from the show interfaces counters trunk command. It displays trunk counters for all interfaces.

Switch# show interfaces counters trunk

Port        TrunkFramesTx  TrunkFramesRx  WrongEncap

Gi0/1                   0              0           0

Gi0/2                   0              0           0 

This is an example of output from the show interfaces counters unicast command. It displays dropped unicast traffic for all interfaces.

Switch# show interfaces counters unicast

Port      UcastSuppDiscards

Gi0/1                  6872

Gi0/2                     0

This is an example of output from the show interfaces gigabitethernet0/1 counters unicast command. It displays dropped unicast traffic for the interface:

Switch# show interfaces gigabitethernet0/1 counters unicast

Port      UcastSuppDiscards

Gi0/1                     0 

Related Commands

Command	Description
show interfaces	Displays additional interface characteristics.
storm-control	Sets storm-control broadcast, multicast, and unicast suppression levels for an interface.
show storm-control	Displays storm-control settings for an interface or all interfaces.

show ip igmp profile

Use the show ip igmp profile privileged EXEC command to view all configured Internet Group Management Protocol (IGMP) profiles or a specified IGMP profile.

show ip igmp profile [profile number] [ | {begin | exclude | include} expression]

Syntax Description

profile number	(Optional) The IGMP profile number to be displayed. The range is from 1 to 4294967295. If no profile number is entered, all IGMP profiles are displayed.
| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(8)EA1	This command was first introduced.

Usage Guidelines

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

Examples

These are examples of output from the show ip igmp profile privileged EXEC command, with and without specifying a profile number. If no profile number is entered, the display includes all profiles configured on the switch.

Switch# show ip igmp profile 40

IGMP Profile 40

    permit

    range 233.1.1.1 233.255.255.255

Switch# show ip igmp profile

IGMP Profile 3

    range 230.9.9.0 230.9.9.0

IGMP Profile 4

    permit

    range 229.9.9.0 229.255.255.255

Related Commands

Command	Description
ip igmp profile	Configures the specified IGMP profile number.

show ip igmp snooping

Use the show ip igmp snooping privileged EXEC command to display the Internet Group Management Protocol (IGMP) snooping configuration of the switch or the VLAN. Use the mrouter keyword to display the dynamically learned and manually configured multicast router ports.

show ip igmp snooping [vlan vlan-id | mrouter [vlan vlan-id] [ | {begin | exclude | include} expression]

Syntax Description

vlan vlan-id	(Optional) Specify a VLAN; valid values are 0 to 1001.
mrouter	(Optional) Display multicast router ports.
| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

Use this command to display snooping characteristics for the switch or for a specific VLAN.

You can also use the show mac-address-table multicast privileged EXEC command to display entries in the MAC address table for a VLAN that has IGMP snooping enabled.

When multicast VLAN registration (MVR) is enabled, the show ip igmp snooping mrouter command displays MVR multicast router information and IGMP snooping information.

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

Examples

This is an example of output from the show ip igmp snooping command. It shows how to display snooping characteristics for all VLANs on the switch.

Switch# show ip igmp snooping 

vlan 1

----------

 IGMP snooping is globally enabled

 IGMP snooping is enabled on this Vlan

 IGMP snooping immediate-leave is disabled on this Vlan

 IGMP snooping mrouter learn mode is pim-dvmrp on this Vlan

 IGMP snooping is running in IGMP_ONLY mode on this Vlan

vlan 2

----------

 IGMP snooping is globally enabled

 IGMP snooping is enabled on this Vlan

 IGMP snooping immediate-leave is disabled on this Vlan

 IGMP snooping mrouter learn mode is pim-dvmrp on this Vlan

 IGMP snooping is running in IGMP_ONLY mode on this Vlan

vlan 10

----------

 IGMP snooping is globally enabled

 IGMP snooping is enabled on this Vlan

 IGMP snooping immediate-leave is disabled on this Vlan

 IGMP snooping mrouter learn mode is pim-dvmrp on this Vlan

 IGMP snooping is running in IGMP_ONLY mode on this Vlan 

This is an example of output from the show ip igmp snooping vlan 1 command. It shows how to display snooping characteristics for a specific VLAN.

Switch# show ip igmp snooping vlan 1

IGMP snooping is globally enabled

 IGMP snooping is enabled on this Vlan

 IGMP snooping immediate-leave is disabled on this Vlan

 IGMP snooping mrouter learn mode is pim-dvmrp on this Vlan

 IGMP snooping is running in IGMP_ONLY mode on this Vlan

This is an example of output from the show ip igmp snooping mrouter command. It shows how to display multicast router ports on the switch.

Switch# show ip igmp snooping mrouter

vlan            ports

-----+----------------------------------------

  1          Gi0/1,Gi0/1, Router

  2          Gi0/3,Gi0/4

This is an example of output from the show ip igmp snooping mrouter vlan 1 command. It shows how to display multicast router ports for a specific VLAN.

Switch# show ip igmp snooping mrouter vlan 1

vlan            ports

-----+----------------------------------------

  1          Gi0/1,Gi0/1, Router

Related Commands

Command	Description
ip igmp snooping	Enables and configures IGMP snooping on the switch or on a VLAN.
show mac-address-table multicast	Displays the Layer 2 multicast entries for a VLAN.

show l2tcam

Use the show l2tcam privileged EXEC command to display information about the portion of the ternary content addressable memory (TCAM) devoted to Layer 2 addresses. Use the keywords to display forwarding (bridging) or learning (MAC address learning) information or to display allocation statistics of MAC address types.

show l2tcam {cam {forwarding | learning} | shadow} [ | {begin | exclude | include} expression]

Syntax Description

cam	Display contents and associated information about TCAM Layer 2 contents. This display output is a raw hex dump of information, intended for a Cisco technical support representative.
forwarding	Display TCAM Layer 2 forwarding (bridging) information.
learning	Display TCAM Layer 2 learning (MAC address learning) information.
shadow	Display allocation statistics for various address types of MAC addresses that the software keeps track of. Address types are identified only by number.
| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

This display provides information that might be useful for Cisco technical support representatives troubleshooting the switch.

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

Examples

This is an example of output from the show l2tcam cam learning command:

Switch# show l2tcam cam learning

mask 1156  F7 FFFFFFFF FFFFFFFF

mask 1157  F7 FFFFFFFF FFFFFFFF

mask 1158  F7 FFFFFFFF FFFFFFFF

mask 1159  F7 FFFFFFFF FFFFFFFF

9248       00 00000000 00000000     80070000

9249       00 00000000 00000000     80060000

9250       00 00000000 00000000     80070000

9251       18 00010002 4B293A00     80020000

9252       00 00000000 00000000     80060000

9253       00 00000000 00000000     80010000

9254       00 00000000 00000000     80030000

9255       18 00010002 4B296700     80040000

<output truncated>

 9368       FF FFFFFFFF FFFFFFFF     5E731478

9369       FF FFFFFFFF FFFFFFFF     17B195AE

9370       FF FFFFFFFF FFFFFFFF     AB2DECEA

9371       FF FFFFFFFF FFFFFFFF     D821EC4E

9372       FF FFFFFFFF FFFFFFFF     E6E55344

9373       FF FFFFFFFF FFFFFFFF     FBFB0EEE

9374       FF FFFFFFFF FFFFFFFF     2057A03D

9375       FF FFFFFFFF FFFFFFFF     E55FE7C3

This is an example of output from the show l2tcam shadow command:

Switch# show l2tcam shadow

learning table

type  start  end   firstfree  firstfreeentry  flag  used/free

0     0      79    0          0               4        0/640

1     80     83    80         0               4        0/32

2     1159   84    1159       3               2        3/8605

3     1160   1167  1160       0               1        0/64

4     1168   1171  1168       1               1        1/31

forwarding table

type  start  end   firstfree  firstfreeentry  flag  used/free

0     0      0     0          0               12       0/0

1     0      0     0          0               12       0/0

2     0      77    0          0               4        0/624

3     78     83    82         6               1       38/10

4     84     1159  84         3               4        3/8605

5     1287   1160  1275       3               2       99/925

6     1415   1288  1403       3               2       99/925

7     1416   1417  1416       0               1        0/16

8     1801   1418  1801       0               2        0/3072

9     1802   1803  1802       1               1        1/15

10    1804   1805  1804       1               1        1/15

11    1809   1806  1809       0               2        0/32

12    1810   1811  1810       2               1        2/14

Related Commands

Command	Description
show l3tcam	Displays information about the TCAM devoted to Layer 3 forwarding information.
show mac-address-table	Displays the MAC address table static and dynamic entries.

show l3tcam

Use the show l3tcam privileged EXEC command to display information about the portion of the ternary content addressable memory (TCAM) devoted to Layer 3 forwarding (IP routing) information.

show l3tcam {cam | shadow} [ | {begin | exclude | include} expression]

This command is available only if the enhanced multilayer software image (EMI) is installed. All Catalyst 3550 Gigabit Ethernet switches ship with the EMI installed. Catalyst 3550 Fast Ethernet switches can be shipped with either the standard multilayer software image (SMI) or EMI pre-installed. You can order the Enhanced Multilayer Software Image Upgrade kit to upgrade Catalyst 3550 Fast Ethernet switches from the SMI to the EMI.

Syntax Description

cam	Display contents and associated information about TCAM Layer 3 contents devoted to unicast and multicast IP routing. This display output is a raw hex dump of information, intended for a Cisco technical support representative.
shadow	Display contents and associated information about TCAM Layer 3 contents formatted to display routes and adjacencies associated with each mask, and some overall statistics.
| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

This display provides information that might be useful for Cisco technical support representatives troubleshooting the switch.

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

Examples

This is an example of output from the show l3tcam cam command:

Switch# show l3tcam cam

00 00 00 42 00 00 00 00 0A 01 01 0F

Mask(s)

00 00 00 F1 00 00 00 00 FF FF FF FF

00 00 00 F1 00 00 00 00 FF FF FF FF

00 00 00 F1 00 00 00 00 FF FF FF FF

00 00 00 F1 00 00 00 00 FF FF FF FF

Entries

00 00 00 42 00 00 00 00 0A 01 01 0F     ( 00 04 80 00  )

Mask(s)

00 00 00 F1 00 00 00 00 FF FF FF 00

00 00 00 F1 00 00 00 00 FF FF FF 00

00 00 00 F1 00 00 00 00 FF FF FF 00

00 00 00 F1 00 00 00 00 FF FF FF 00

Entries

<output truncated>

This is an example of output from the show l3tcam shadow command:

Switch# show l3tcam shadow

L3 TCAM: total enries = 30720, used entries = 12

Prefix 33: Start=0(0) End=3(24) FirstFree=1, NumFree = 31

     Offset      Tbl+Flgs        SA      DA      Assoc

=================================================

Mask: NA         0xF1    0.0.0.0         255.255.255.255         --

Entry: 0         0x42    0.0.0.0         10.1.1.15       0x00048000

Prefix 41: Start=4(32) End=7(56) FirstFree=32, NumFree = 32

     Offset      Tbl+Flgs        SA      DA      Assoc

=================================================

Mask: NA         0xF1    0.0.0.0         255.255.255.0   --

Prefix 65: Start=8(64) End=11(88) FirstFree=66, NumFree = 30

     Offset      Tbl+Flgs        SA      DA      Assoc

=================================================

Mask: NA         0xF1    0.0.0.0         0.0.0.0         --

Entry: 64        0x42    0.0.0.0         0.0.0.0         0x00048000

Entry: 65        0x43    0.0.0.0         0.0.0.0         0x00048000

<output truncated>

Related Commands

Command	Description
show adjacency	Displays Cisco Express Forwarding (CEF) adjacency table information. For syntax information, select Cisco IOS Switching Services Command Reference for IOS Release 12.1 > IP Addressing and Services > Commands.
show arp	Displays the entries in the ARP table. For syntax information, select Cisco IOS IP and IP Routing Command Reference for IOS Release 12.1 > IP Addressing and Services > IP Addressing Commands.
show ip route	Displays the current state of the routing table. For syntax information, select Cisco IOS IP and IP Routing Command Reference for IOS Release 12.1 > IP Routing Protocols > IP Routing Protocol-Independent Commands.
show l2tcam	Displays information about the portion of the TCAM devoted to Layer 2 information.

show mac-address-table

Use the show mac-address-table privileged EXEC command to display the MAC address table static and dynamic entries.

show mac-address-table [ | {begin | exclude | include} expression]

Syntax Description

| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

Examples

This is an example of output from the show mac-address-table command:

Switch# show mac-address-table

          Mac Address Table

------------------------------------------

Vlan    Mac Address       Type       Ports

----    -----------       ----       -----

 All    0000.0000.0001    STATIC     CPU

 All    0000.0000.0002    STATIC     CPU

 All    0000.0000.0003    STATIC     CPU

 All    0000.0000.0009    STATIC     CPU

 All    0000.0000.0012    STATIC     CPU

 All    0180.c200.000b    STATIC     CPU

 All    0180.c200.000c    STATIC     CPU

 All    0180.c200.000d    STATIC     CPU

 All    0180.c200.000e    STATIC     CPU

 All    0180.c200.000f    STATIC     CPU

 All    0180.c200.0010    STATIC     CPU

   1    0030.9441.6327    DYNAMIC    Fa0/23

Total Mac Addresses for this criterion: 12

Related Commands

Command	Description
clear mac-address-table dynamic	Delete from the MAC address table a specific dynamic address, all dynamic addresses on a particular interface, or all dynamic addresses on a particular VLAN.
show mac-address-table aging-time	Displays the aging time in all VLANs or the specified VLAN.
show mac-address-table count	Displays the number of addresses present in all VLANs or the specified VLAN.
show mac-address-table dynamic	Displays dynamic MAC address table entries only.
show mac-address-table interfacee	Displays the MAC address table information for the specified interface.
show mac-address-table multicast	Displays the Layer 2 multicast entries for all VLANs or the specified VLAN.
show mac-address-table notification	Displays the MAC address notification settings for all interfaces or the specified interface.
show mac-address-table static	Displays static MAC address table entries only.
show mac-address-table vlan	Displays the MAC address table information for the specified VLAN.

show mac-address-table address

Use the show mac-address-table address privileged EXEC command to display MAC address table information for the specified MAC address.

show mac-address-table address mac-address [interface interface-id] [vlan vlan-id] [ | {begin | exclude | include} expression]

Syntax Description

mac-address	Specify the 48-bit MAC address; the valid format is H.H.H.
interface interface-id	(Optional) Display information for a specific interface. Valid interfaces include physical ports and port channels.
vlan vlan-id	(Optional) Display entries for the specific VLAN only. The range is 1 to 1005.
| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

Examples

This is an example of output from the show mac-address-table address command:

Switch# show mac-address-table address 0002.4b28.c482

          Mac Address Table

------------------------------------------

Vlan    Mac Address     Type    Ports

----    -----------     ----    -----

 All    0002.4b28.c482  STATIC  CPU

Total Mac Addresses for this criterion: 1 

Related Commands

Command	Description
show mac-address-table aging-time	Displays the aging time in all VLANs or the specified VLAN.
show mac-address-table count	Displays the number of addresses present in all VLANs or the specified VLAN.
show mac-address-table dynamic	Displays dynamic MAC address table entries only.
show mac-address-table interface	Displays the MAC address table information for the specified interface.
show mac-address-table multicast	Displays the Layer 2 multicast entries for all VLANs or the specified VLAN.
show mac-address-table notification	Displays the MAC address notification settings for all interfaces or the specified interface.
show mac-address-table static	Displays static MAC address table entries only.
show mac-address-table vlan	Displays the MAC address table information for the specified VLAN.

show mac-address-table aging-time

Use the show mac-address-table aging-time privileged EXEC command to display the aging time in all VLANs or the specified VLAN.

show mac-address-table aging-time [vlan vlan-id] [ | {begin | exclude | include} expression]

Syntax Description

vlan vlan-id	(Optional) Display aging time information for a specific VLAN. The range is 1 to 1005; do not enter leading zeros.
| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

If no VLAN number is specified, then the aging time for all VLANs is displayed.

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

Examples

This is an example of output from the show mac-address-table aging-time command:

Switch# show mac-address-table aging-time

Vlan    Aging Time

----    ----------

   1     300 

This is an example of output from the show mac-address-table aging-time vlan 10 command:

Switch# show mac-address-table aging-time vlan 10

Vlan    Aging Time

----    ----------

  10     300 

Related Commands

Command	Description
mac-address-table aging-time	Sets the length of time that a dynamic entry remains in the MAC address table after the entry is used or updated.
show mac-address-table address	Displays MAC address table information for the specified MAC address.
show mac-address-table count	Displays the number of addresses present in all VLANs or the specified VLAN.
show mac-address-table dynamic	Displays dynamic MAC address table entries only.
show mac-address-table interface	Displays the MAC address table information for the specified interface.
show mac-address-table multicast	Displays the Layer 2 multicast entries for all VLANs or the specified VLAN.
show mac-address-table notification	Displays the MAC address notification settings for all interfaces or the specified interface.
show mac-address-table static	Displays static MAC address table entries only.
show mac-address-table vlan	Displays the MAC address table information for the specified VLAN.

show mac-address-table count

Use the show mac-address-table count privileged EXEC command to display the number of addresses present in all VLANs or the specified VLAN.

show mac-address-table count [vlan vlan-id] [ | {begin | exclude | include} expression]

Syntax Description

vlan vlan-id	(Optional) Display the number of addresses for a specific VLAN. The range is 1 to 1005; do not enter leading zeros.
| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

If no VLAN number is specified, then the address count for all VLANs is displayed.

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

Examples

This is an example of output from the show mac-address-table count command:

Switch# show mac-address-table count

Mac Entries for Vlan   : 1

---------------------------

Dynamic Address Count  : 2

Static  Address Count  : 0

Total Mac Addresses    : 2 

Related Commands

Command	Description
show mac-address-table address	Displays MAC address table information for the specified MAC address.
show mac-address-table aging-time	Displays the aging time in all VLANs or the specified VLAN.
show mac-address-table dynamic	Displays dynamic MAC address table entries only.
show mac-address-table interface	Displays the MAC address table information for the specified interface.
show mac-address-table multicast	Displays the Layer 2 multicast entries for all VLANs or the specified VLAN.
show mac-address-table notification	Displays the MAC address notification settings for all interfaces or the specified interface.
show mac-address-table static	Displays static MAC address table entries only.
show mac-address-table vlan	Displays the MAC address table information for the specified VLAN.

show mac-address-table dynamic

Use the show mac-address-table dynamic privileged EXEC command to display dynamic MAC address table entries only.

show mac-address-table dynamic [address mac-address] [interface interface-id] [vlan vlan-id]
[ | {begin | exclude | include} expression]

Syntax Description

address mac-address	(Optional) Specify a 48-bit MAC address; the valid format is H.H.H.
interface interface-id	(Optional) Specify an interface to match; valid interfaces include physical ports and port channels.
vlan vlan-id	(Optional) Display entries for a specific VLAN; the range is 1 to 1005.
| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

Examples

This is an example of output from the show mac-address-table dynamic command:

Switch# show mac-address-table dynamic

          Mac Address Table

------------------------------------------

Vlan    Mac Address     Type    Ports

----    -----------     ----    -----

   1    0030.b635.7862  DYNAMIC Gi0/2

   1    00b0.6496.2741  DYNAMIC Gi0/2

Total Mac Addresses for this criterion: 2 

Related Commands

Command	Description
clear mac-address-table dynamic	Deletes from the MAC address table a specific dynamic address, all dynamic addresses on a particular interface, or all dynamic addresses on a particular VLAN.
show mac-address-table address	Displays MAC address table information for the specified MAC address.
show mac-address-table aging-time	Displays the aging time in all VLANs or the specified VLAN.
show mac-address-table count	Displays the number of addresses present in all VLANs or the specified VLAN.
show mac-address-table interface	Displays the MAC address table information for the specified interface.
show mac-address-table multicast	Displays the Layer 2 multicast entries for all VLANs or the specified VLAN.
show mac-address-table notification	Displays the MAC address notification settings for all interfaces or the specified interface.
show mac-address-table static	Displays static MAC address table entries only.
show mac-address-table vlan	Displays the MAC address table information for the specified VLAN.

show mac-address-table interface

Use the show mac-address-table interface privileged command to display the MAC address table information for the specified interface in the specified VLAN.

show mac-address-table interface interface-id [vlan vlan-id] [ | {begin | exclude | include} expression]

Syntax Description

interface-id	Specify an interface type; valid interfaces include physical ports and port channels.
vlan vlan-id	(Optional) Display entries for a specific VLAN; the range is 1 to 1005. Do not enter leading zeros.
| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

Examples

This is an example of output from the show mac-address-table interface command:

Switch# show mac-address-table interface gigabitethernet0/2

          Mac Address Table

------------------------------------------

Vlan    Mac Address     Type    Ports

----    -----------     ----    -----

   1    0030.b635.7862  DYNAMIC Gi0/2

   1    00b0.6496.2741  DYNAMIC Gi0/2

Total Mac Addresses for this criterion: 2 

Related Commands

Command	Description
show mac-address-table address	Displays MAC address table information for the specified MAC address.
show mac-address-table aging-time	Displays the aging time in all VLANs or the specified VLAN.
show mac-address-table count	Displays the number of addresses present in all VLANs or the specified VLAN.
show mac-address-table dynamic	Displays dynamic MAC address table entries only.
show mac-address-table multicast	Displays the Layer 2 multicast entries for all VLANs or the specified VLAN.
show mac-address-table notification	Displays the MAC address notification settings for all interfaces or the specified interface.
show mac-address-table static	Displays static MAC address table entries only.
show mac-address-table vlan	Displays the MAC address table information for the specified VLAN.

show mac-address-table multicast

Use the show mac-address-table multicast privileged EXEC command to display the Layer 2 multicast entries for all VLANs or the specified VLAN.

show mac-address-table multicast [count] | igmp-snooping [count] | user [count] | vlan vlan-id [count] [ | {begin | exclude | include} expression]

Syntax Description

count	(Optional) Display the total number of entries for the specified command options, instead of the actual entries.
igmp-snooping	(Optional) Display entries learned through Internet Group Management Protocol (IGMP) snooping.
user	(Optional) Display the user-configured multicast entries only.
vlan vlan-id	(Optional) Display addresses for a specific VLAN. The range is 1 to 1005; do not enter leading zeros.
| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

Examples

This is an example of output from the show mac-address-table multicast command. It shows how to display all multicast entries for the switch.

Switch# show mac-address-table multicast

Vlan    Mac Address     Type    Ports

----    -----------     ----    -----

   1    0100.5e00.0128  IGMP    Gi0/1 

This is an example of output from the show mac-address-table multicast count command. It shows how to display a total count of MAC address entries for the switch.

Switch# show mac-address-table multicast count

Multicast MAC Entries for all vlans:    10

This is an example of output from the show mac-address-table multicast vlan 1 count command. It shows how to display a total count of MAC address entries for a VLAN.

Switch# show mac-address-table multicast vlan 1 count

Multicast MAC Entries for vlan 1:    4

This is an example of output from the show mac-address-table multicast interface vlan1 command. It shows how to display the user-configured multicast entries for VLAN 1.

Switch# show mac-address-table multicast interface vlan1

vlan   mac address     type 	        ports

-----+---------------+--------+---------+---+--------------------------------

  1  0100.5e02.0203    user           Gi0/1,Gi0/2

  1  0100.5e00.0128    user           Gi0/1,Gi0/2

This is an example of output from the show mac-address-table multicast vlan 1 igmp-snooping count command. It shows how to display the total number of entries learned through IGMP snooping for VLAN 1:

Switch# show mac-address-table multicast vlan 1 igmp-snooping count

Number of IGMP Learned Multicast Addresses:    2

Related Commands

Command	Description
show mac-address-table address	Displays MAC address table information for the specified MAC address.
show mac-address-table aging-time	Displays the aging time in all VLANs or the specified VLAN.
show mac-address-table count	Displays the number of addresses present in all VLANs or the specified VLAN.
show mac-address-table dynamic	Displays dynamic MAC address table entries only.
show mac-address-table interface	Displays the MAC address table information for the specified interface.
show mac-address-table notification	Displays the MAC address notification settings for all interfaces or the specified interface.
show mac-address-table static	Displays static MAC address table entries only.
show mac-address-table vlan	Displays the MAC address table information for the specified VLAN.

show mac-address-table notification

Use the show mac-address-table notification privileged EXEC command to display the MAC address notification settings for all interfaces or the specified interface.

show mac-address-table notification [interface [interface-id] [ | {begin | exclude | include} expression]

Syntax Description

interface	(Optional) Display information for all interfaces. Valid interfaces include physical ports and port channels.
interface-id	(Optional) Display information for the specified interface. Valid interfaces include physical ports and port channels.
| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(8)EA1	This command was first introduced.

Usage Guidelines

Use the show mac-address-table notification command without any keywords to display whether the feature is enabled or disabled, the MAC notification interval, the maximum number of entries allowed in the history table, and the history table contents.

Use the interface keyword to display the flags for all interfaces. If the interface-id is included, only the flags for that interface are displayed.

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

Examples

This is an example of output from the show mac-address-table notification command:

Switch# show mac-address-table notification

MAC Notification Feature is Enabled on the switch

Interval between Notification Traps : 60 secs

Number of MAC Addresses Added : 4

Number of MAC Addresses Removed : 4

Number of Notifications sent to NMS : 3

Maximum Number of entries configured in History Table : 100

Current History Table Length : 3

MAC Notification Traps are Enabled

History Table contents

----------------------

History Index 0, Entry Timestamp 1032254, Despatch Timestamp 1032254

MAC Changed Message :

Operation: Added   Vlan: 2     MAC Addr: 0000.0000.0001 Module: 0   Port: 1

History Index 1, Entry Timestamp 1038254, Despatch Timestamp 1038254

MAC Changed Message :

Operation: Added   Vlan: 2     MAC Addr: 0000.0000.0000 Module: 0   Port: 1

Operation: Added   Vlan: 2     MAC Addr: 0000.0000.0002 Module: 0   Port: 1

Operation: Added   Vlan: 2     MAC Addr: 0000.0000.0003 Module: 0   Port: 1

History Index 2, Entry Timestamp 1074254, Despatch Timestamp 1074254

MAC Changed Message :

Operation: Deleted Vlan: 2     MAC Addr: 0000.0000.0000 Module: 0   Port: 1

Operation: Deleted Vlan: 2     MAC Addr: 0000.0000.0001 Module: 0   Port: 1

Operation: Deleted Vlan: 2     MAC Addr: 0000.0000.0002 Module: 0   Port: 1

Operation: Deleted Vlan: 2     MAC Addr: 0000.0000.0003 Module: 0   Port: 1

Related Commands

Command	Description
show mac-address-table address	Displays MAC address table information for the specified MAC address.
show mac-address-table aging-time	Displays the aging time in all VLANs or the specified VLAN.
show mac-address-table count	Displays the number of addresses present in all VLANs or the specified VLAN.
show mac-address-table dynamic	Displays dynamic MAC address table entries only.
show mac-address-table interface	Displays the MAC address table information for the specified interface.
show mac-address-table multicast	Displays the Layer 2 multicast entries for all VLANs or the specified VLAN.
show mac-address-table static	Displays static MAC address table entries only.
show mac-address-table vlan	Displays the MAC address table information for the specified VLAN.

show mac-address-table static

Use the show mac-address-table static privileged EXEC command to display static MAC address table entries only.

show mac-address-table static [address mac-address] [interface interface-id] [vlan vlan-id]
[ | {begin | exclude | include} expression]

Syntax Description

address mac-address	(Optional) Specify a 48-bit MAC address; the valid format is H.H.H.
interface interface-id	(Optional) Specify an interface to match; valid interfaces include physical ports and port channels.
vlan vlan-id	(Optional) Display addresses for a specific VLAN. The range is 1 to 1005; do not enter leading zeros.
| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

Examples

This is an example of output from the show mac-address-table static command:

Switch# show mac-address-table static

          Mac Address Table

------------------------------------------

Vlan    Mac Address     Type    Ports

----    -----------     ----    -----

 All    0100.0ccc.cccc  STATIC  CPU

 All    0180.c200.0000  STATIC  CPU

 All    0100.0ccc.cccd  STATIC  CPU

 All    0180.c200.0001  STATIC  CPU

 All    0180.c200.0002  STATIC  CPU

 All    0180.c200.0003  STATIC  CPU

 All    0180.c200.0004  STATIC  CPU

 All    0180.c200.0005  STATIC  CPU

 All    0180.c200.0006  STATIC  CPU

 All    0180.c200.0007  STATIC  CPU

Total Mac Addresses for this criterion: 10 

Related Commands

Command	Description
mac-address-table static	Adds static addresses to the MAC address table.
show mac-address-table address	Displays MAC address table information for the specified MAC address.
show mac-address-table aging-time	Displays the aging time in all VLANs or the specified VLAN.
show mac-address-table count	Displays the number of addresses present in all VLANs or the specified VLAN.
show mac-address-table dynamic	Displays dynamic MAC address table entries only.
show mac-address-table interface	Displays the MAC address table information for the specified interface.
show mac-address-table multicast	Displays the Layer 2 multicast entries for all VLANs or the specified VLAN.
show mac-address-table notification	Displays the MAC address notification settings for all interfaces or the specified interface.
show mac-address-table vlan	Displays the MAC address table information for the specified VLAN.

show mac-address-table vlan

Use the show mac-address-table vlan privileged EXEC command to display the MAC address table information for the specified VLAN.

show mac-address-table vlan vlan-id [ | {begin | exclude | include} expression]

Syntax Description

vlan-id	(Optional) Display addresses for a specific VLAN. The range is 1 to 1005; do not enter leading zeros.
| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

Examples

This is an example of output from the show mac-address-table vlan 1 command:

Switch# show mac-address-table vlan 1

          Mac Address Table

------------------------------------------

Vlan    Mac Address     Type    Ports

----    -----------     ----    -----

   1    0100.0ccc.cccc  STATIC  CPU

   1    0180.c200.0000  STATIC  CPU

   1    0100.0ccc.cccd  STATIC  CPU

   1    0180.c200.0001  STATIC  CPU

   1    0180.c200.0002  STATIC  CPU

   1    0180.c200.0003  STATIC  CPU

   1    0180.c200.0004  STATIC  CPU

   1    0180.c200.0005  STATIC  CPU

   1    0180.c200.0006  STATIC  CPU

   1    0180.c200.0007  STATIC  CPU

Total Mac Addresses for this criterion: 10 

Related Commands

Command	Description
show mac-address-table address	Displays MAC address table information for the specified MAC address.
show mac-address-table aging-time	Displays the aging time in all VLANs or the specified VLAN.
show mac-address-table count	Displays the number of addresses present in all VLANs or the specified VLAN.
show mac-address-table dynamic	Displays dynamic MAC address table entries only.
show mac-address-table interface	Displays the MAC address table information for the specified interface.
show mac-address-table multicast	Displays the Layer 2 multicast entries for all VLANs or the specified VLAN.
show mac-address-table notification	Displays the MAC address notification settings for all interfaces or the specified interface.
show mac-address-table static	Displays static MAC address table entries only.

show mls qos

Use the show mls qos privileged EXEC command to display global quality of service (QoS) configuration information.

show mls qos [ | {begin | exclude | include} expression]

Syntax Description

| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

Examples

This is an example of output from the show mls qos command:

Switch# show mls qos 

Qos is enabled

Related Commands

Command	Description
mls qos	Enables quality of service (QoS) for the entire switch.

show mls qos aggregate-policer

Use the show mls qos aggregate-policer privileged EXEC command to display the quality of service (QoS) aggregate policer configuration. A policer defines a maximum permissible rate of transmission, a maximum burst size for transmissions, and an action to take if either maximum is exceeded.

show mls qos aggregate-policer [aggregate-policer-name] [ | {begin | exclude | include} expression]

Syntax Description

aggregate-policer-name	(Optional) Display the policer configuration for the specified name.
| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

Examples

This is an example of output from the show mls qos aggregate-policer command:

Switch# show mls qos aggregate-policer policer1

aggregate-policer policer1 88000 2000000 exceed-action drop

Not used by any policy map 

Related Commands

Command	Description
mls qos aggregate-policer	Defines policer parameters that can be shared by multiple classes within a policy map.

show mls qos interface

Use the show mls qos interface privileged EXEC command to display quality of service (QoS) information at the interface level.

show mls qos interface [interface-id] [buffers | policers | queueing | statistics]
[ | {begin | exclude | include} expression]

Syntax Description

interface-id	(Optional) Display QoS information for the specified interface. Valid interfaces include physical ports.
vlan vlan-id	(Optional) Display QoS information for a specific VLAN. The range is 1 to 1001; do not enter leading zeros.
buffers	(Optional) Display buffer settings of the queues. For Gigabit-capable Ethernet ports, the display includes the queue depth for each of the four queues and the tail drop or Weighted Random Early Detection (WRED) thresholds. For 10/100 Ethernet ports, the display includes the configured minimum-reserve settings.
policers	(Optional) Display all the policers configured on the interface, their settings, and the number of policers that are currently unassigned.
queueing	(Optional) Display queueing strategy (weighted round robin, priority queueing), the weights corresponding to the queues, and the CoS-to-egress-queue map.
statistics	(Optional) Display all the Differentiated Services Code Points (DSCPs) for which statistics are maintained and the corresponding ingress and egress statistics, including the number of bytes dropped.
| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

---

Note Though visible in the command-line help strings, the vlan vlan-id options are not supported.

---

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

If no keyword is specified with the show mls qos interface command, the port QoS mode (DSCP trusted, CoS trusted, untrusted, and so forth), default class of service (CoS) value, DSCP-to-DSCP-mutation map (if any) attached to the port, and policy map (if any) attached to the interface are displayed. If a specific interface is not specified, the information for all interfaces is displayed.

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

Examples

This is an example of output from the show mls qos interface gigabitethernet0/1 buffers command:

Switch# show mls qos interface gigabitethernet0/1 buffers

GigabitEthernet0/1

Notify Q depth:

qid-size

 1 - 25

 2 - 25

 3 - 25

 4 - 25

qid WRED thresh1 thresh2

 1  dis   100      100

 2  dis   100      100

 3  dis   100      100

 4  dis   100      100

In the preceding display, the qid-size section shows the weight (the amount of space allocated to each queue) as configured by the wrr-queue queue-limit interface configuration command. The next section of the display shows the settings of the tail-drop thresholds for all four queues. The WRED column shows that it is disabled, which means the tail-drop is in effect. Tail-drop thresholds are configured by the wrr-queue threshold interface configuration command.

This is an example of output from the show mls qos interface fastethernet0/1 buffers command:

Switch# show mls qos interface fastethernet0/1 buffers

FastEthernet0/1

Minimum reserve buffer size:

 100 100 100 100 100 100 100 100

Minimum reserve buffer level select:

 4 2 5 7

The preceding display shows that the buffersize for all minimum-reserve levels is set to 100 packets. Line 5 of the display shows that queue 1 selects minimum-reserve level 4, queue 2 selects minimum-reserve level 2, queue 3 selects minimum-reserve level 5, and queue 4 selects minimum-reserve level 7.

This is an example of output from the show mls qos interface gigabitethernet0/1 queueing command:

Switch# show mls qos interface gigabitethernet0/1 queueing

GigabitEthernet0/1

Ingress expedite queue: dis

Egress expedite queue: ena

wrr bandwidth weights:

qid-weights

 1 - 25

 2 - 25

 3 - 25

Dscp-threshold map:

     d1 :  d2 0  1  2  3  4  5  6  7  8  9

     ---------------------------------------

      0 :    01 01 01 01 01 01 01 01 01 01

      1 :    01 01 01 01 01 01 01 01 01 01

      2 :    01 01 01 01 01 01 01 01 01 01

      3 :    01 01 01 01 01 01 01 01 01 01

      4 :    01 01 01 01 01 01 01 01 01 01

      5 :    01 01 01 01 01 01 01 01 01 01

      6 :    01 01 01 01

Cos-queue map:

cos-qid

 0 - 1

 1 - 1

 2 - 2

 3 - 2

 4 - 3

 5 - 3

 6 - 4

 7 - 4 

In the preceding display, the egress expedite queue is enabled. Because of this, the weight of the expedite queue (queue 4) is ignored and not used in the ratio calculation. Only the bandwidth weights for the remaining queues are displayed. The bandwidth weight of the queues is configured by the wrr-queue bandwidth interface configuration command. The CoS-to-queue map shows the CoS values that are mapped to select a queue; this map is configured by the wrr-queue cos-map interface configuration command.

This is an example of output from the show mls qos interface gigabitethernet0/1 statistics command. Table 2-17 describes the fields in this display.

Switch# show mls qos interface gigabitethernet0/1 statistics

Ingress

  dscp: incoming   no_change  classified policed    dropped (in bytes)

    1 : 0          0          0          0          0

    2 : 0          0          0          0          0

    3 : 0          0          0          0          0

    45: 0          0          0          0          0

    23: 0          0          0          0          0

Others: 203216935  24234242   178982693  0          0

Egress

  dscp: incoming   no_change  classified policed    dropped (in bytes)

   1 : 0             n/a       n/a      0          0

   2 : 0             n/a       n/a      0          0

   3 : 0             n/a       n/a      0          0

   45: 0             n/a       n/a      0          0

   23: 0             n/a       n/a      0          0

Others: 155983       n/a       n/a      0          0 

WRED drop counts:

  qid  thresh1    thresh2   FreeQ

   1 : 0          0         1024

   2 : 0          0         1024

   3 : 0          0         1024

   4 : 0          0         1024

Table 2-17 show mls qos interface statistics Field Descriptions 

	Field	Description
Ingress	incoming	Number of packets or bytes with a specific DSCP entering the ingress QoS process.
	no_change	Number of packets or bytes for which the DSCP value did not change after classification.
	classified	Number of packets or bytes that were classified to this DSCP value.
	policed	Number of packets or bytes that were marked down from this DSCP value.
	dropped (in bytes)	Number of packets or bytes dropped by policing.
Egress	incoming	Number of packets or bytes with a specific DSCP entering the egress QoS process.
	no_change	Number of packets with a specific DSCP that did not change.
	classified	Number of packets with a specific DSCP that was classified according to the class map.
	policed	Number of packets or bytes that were marked down from this DSCP.
	dropped (in bytes)	Number of packets or bytes of this DSCP dropped.
WRED drop counts	qid	Queue number.
	thresh1 and thresh2	Number of DSCPs of a specific value dropped at threshold 1 and threshold 2.
	FreeQ	Amount of free queue space available per queue.

Related Commands

Command	Description
mls qos monitor	Defines up to 16 DSCP values for which byte or packet statistics are gathered by hardware.

show mls qos maps

Use the show mls qos maps privileged EXEC command to display quality of service (QoS) mapping information. Maps are used to generate an internal Differentiated Services Code Point (DSCP) value, which represents the priority of the traffic.

show mls qos maps [cos-dscp | dscp-cos | dscp-mutation dscp-mutation-name | dscp-switch-priority | ip-prec-dscp | policed-dscp] [ | {begin | exclude | include} expression]

Syntax Description

cos-dscp	(Optional) Display class of service (CoS)-to-DSCP map.
dscp-cos	(Optional) Display DSCP-to-CoS map.
dscp-mutation dscp-mutation-name	(Optional) Display the specified DSCP-to-DSCP-mutation map.
dscp-switch-priority	(Optional) Display the DSCP-to-switch-priority map.
ip-prec-dscp	(Optional) Display the IP-precedence-to-DSCP map.
policed-dscp	(Optional) Display the policed-DSCP map.
| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

Examples

This is an example of output from the show mls qos maps command:

Switch# show mls qos maps

Policed-dscp map:

     d1 :  d2 0  1  2  3  4  5  6  7  8  9

     ---------------------------------------

      0 :    00 01 02 03 04 05 06 07 08 09

      1 :    10 11 12 13 14 15 16 17 18 19

      2 :    20 21 22 23 24 25 26 27 28 29

      3 :    30 31 32 33 34 35 36 37 38 39

      4 :    40 41 42 43 44 45 46 47 48 49

      5 :    50 51 52 53 54 55 56 57 58 59

      6 :    60 61 62 63

Dscp-cos map:

     d1 :  d2 0  1  2  3  4  5  6  7  8  9

     ---------------------------------------

      0 :    00 00 00 00 00 00 00 00 01 01

      1 :    01 01 01 01 01 01 02 02 02 02

      2 :    02 02 02 02 03 03 03 03 03 03

      3 :    03 03 04 04 04 04 04 04 04 04

      4 :    05 05 05 05 05 05 05 05 06 06

      5 :    06 06 06 06 06 06 07 07 07 07

      6 :    07 07 07 07

Dscp-switch priority map:

     d1 :  d2 0  1  2  3  4  5  6  7  8  9

     ---------------------------------------

      0 :    00 00 00 00 00 00 00 00 00 00

      1 :    00 00 00 00 00 00 01 01 01 01

      2 :    01 01 01 01 01 01 01 01 01 01

      3 :    01 01 02 02 02 02 02 02 02 02

      4 :    02 02 02 02 02 02 02 02 03 03

      5 :    03 03 03 03 03 03 03 03 03 03

      6 :    03 03 03 03

Cos-dscp map:

        cos:   0  1  2  3  4  5  6  7

     --------------------------------

       dscp:   0  8 16 24 32 40 48 56

IpPrecedence-dscp map:

     ipprec:   0  1  2  3  4  5  6  7

     --------------------------------

       dscp:   0  8 16 24 32 40 48 56

Dscp-dscp mutation map:

   Default DSCP Mutation Map:

     d1 :  d2 0  1  2  3  4  5  6  7  8  9

     ---------------------------------------

      0 :    00 01 02 03 04 05 06 07 08 09

      1 :    10 11 12 13 14 15 16 17 18 19

      2 :    20 21 22 23 24 25 26 27 28 29

      3 :    30 31 32 33 34 35 36 37 38 39

      4 :    40 41 42 43 44 45 46 47 48 49

      5 :    50 51 52 53 54 55 56 57 58 59

      6 :    60 61 62 63 

---

Note The d1 column specifies the most-significant digit in the internal DSCP; the d2 row specifies the least-significant digit in the internal DSCP. The intersection of the d1 and d2 values provides the policed-DSCP, the CoS, the switch priority, or the mutated-DSCP value. For example, in the DSCP-to-CoS map, an internal DSCP value of 43 corresponds to a CoS value of 5.

---

Related Commands

Command	Description
mls qos map	Defines the CoS-to-DSCP map, DSCP-to-CoS map, DSCP-to-DSCP-mutation map, IP-precedence-to-DSCP map, and the policed-DSCP map.

show monitor

Use the show monitor privileged EXEC command to display Switch Port Analyzer (SPAN) session information.

show monitor [session session_number] [ | {begin | exclude | include} expression]

Syntax Description

session session_number	(Optional) Specify the number of the SPAN session. Valid values are 1 and 2.
| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(6)EA1	This command was first introduced.

Usage Guidelines

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

Examples

This is an example of output from the show monitor session 1 command:

Switch# show monitor session 1

Session 1

---------

Source Ports:

    RX Only:      None

    TX Only:      Gi0/1

    Both:         None

Source VLANs:

    RX Only:      None

    TX Only:      None

    Both:         None

Destination Ports:Gi0/6

    Encapsulation:DOT1Q

Filter VLANs:     None

This is an example of output from the show monitor command with no session number specified:

Switch# show monitor

Session 1

---------

Source Ports:

    RX Only:       None

    TX Only:       None

    Both:          Gi0/1

Source VLANs:

    RX Only:       None

    TX Only:       None

    Both:          None

Destination Ports: Gi0/10

    Encapsulation: DOT1Q

Filter VLANs:      None

Session 2

---------

Source Ports:

    RX Only:      None

    TX Only:      None

    Both:         None

Source VLANs:

    RX Only:      None

    TX Only:      None

    Both:         None

Destination Ports:None

Filter VLANs:     None

This is an example of output from the show monitor session 1 | begin Destination command. It displays SPAN information for a specific session beginning with the line that starts with Destination.

Switch# show monitor session 1 | begin Destination

Destination Ports: None

Filter VLANs:      None

Related Commands

Command	Description
monitor session	Starts a new SPAN session, adds or deletes interfaces or VLANs to or from an existing SPAN session, and filters SPAN source traffic to specific source VLANs.

show mvr

Use the show mvr privileged EXEC command without keywords to display the current Multicast VLAN Registration (MVR) global parameter values, including whether or not MVR is enabled, the MVR multicast VLAN, the maximum query response time, the number of multicast groups, and the MVR mode (dynamic or compatible).

show mvr [ | {begin | exclude | include} expression]

Syntax Description

| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

Examples

This is an example of output from the show mvr command:

Switch# show mvr

MVR Running: TRUE

MVR multicast vlan: 1

MVR Max Multicast Groups: 256

MVR Current multicast groups: 256

MVR Global query response time: 5 (tenths of sec)

MVR Mode: compatible 

In the preceding display, the maximum number of multicast groups is fixed at 256. The MVR mode is either compatible (for inter-operability with Catalyst 2900 XL and Catalyst 3500 XL switches) or dynamic (where operation is consistent with IGMP snooping operation and dynamic MVR membership on source ports is supported).

Related Commands

Command	Description
mvr (global configuration)	Enables and configures multicast VLAN registration on the switch.
mvr (interface configuration)	Configures MVR ports.
show mvr interface	Displays the configured MVR interfaces, status of the specified interface, or all multicast groups to which the interface belongs when the interface and members keywords are appended to the command.
show mvr members	Displays all ports that are members of an MVR multicast group or, if there are no members, means the group is inactive.

show mvr interface

Use the show mvr interface privileged EXEC command without keywords to display the Multicast VLAN Registration (MVR) receiver and source ports. Use the command with keywords to display MVR parameters for a specific receiver port.

show mvr interface [interface-id [members [vlan vlan-id]]] [ | {begin | exclude | include} expression]

Syntax Description

interface-id	(Optional) Display MVR type, status, and Immediate Leave setting for the interface.
members	(Optional) Display all MVR groups to which the specified interface belongs.
vlan vlan-id	(Optional) Display all MVR group members on this VLAN. The VLAN ID range is from 1 to 1001.
| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

If the entered port identification is a non-MVR port or a source port, the command returns an error message. For receiver ports, it displays the port type, per port status, and Immediate-Leave setting.

If you enter the members keyword, all MVR group members on the interface are displayed. If you enter a VLAN ID, all MVR group members in the VLAN are displayed.

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

Examples

This is an example of output from the show mvr interface command:

Switch# show mvr interface

Port    Type            Status          Immediate Leave

----    ----            -------         ---------------

Gi0/1   SOURCE          ACTIVE/UP       DISABLED

Gi0/2   RECEIVER        ACTIVE/DOWN     DISABLED

Gi0/5   RECEIVER        ACTIVE/UP       ENABLED 

In the preceding display, Status is defined as follows:

•Active means the port is part of a VLAN

•Up/Down means that the port is forwarding/nonforwarding

•Inactive means that the port is not yet part of any VLAN.

This is an example of output from the show mvr interface gigabitethernet 0/2 command:

Switch# show mvr interface gigabitethernet0/2

Type: RECEIVER Status: ACTIVE Immediate Leave: DISABLED 

This is an example of output from the show mvr interface gigabitethernet0/6 members command:

Switch# show mvr interface gigabitethernet0/6 members

239.255.0.0     DYNAMIC ACTIVE

239.255.0.1     DYNAMIC ACTIVE

239.255.0.2     DYNAMIC ACTIVE

239.255.0.3     DYNAMIC ACTIVE

239.255.0.4     DYNAMIC ACTIVE

239.255.0.5     DYNAMIC ACTIVE

239.255.0.6     DYNAMIC ACTIVE

239.255.0.7     DYNAMIC ACTIVE

239.255.0.8     DYNAMIC ACTIVE

239.255.0.9     DYNAMIC ACTIVE

Related Commands

Command	Description
mvr (global configuration)	Enables and configures multicast VLAN registration on the switch.
mvr (interface configuration)	Configures MVR ports.
show mvr	Displays the global MVR configuration on the switch.
show mvr members	Displays all receiver ports that are members of an MVR multicast group.

show mvr members

Use the show mvr members privileged EXEC command to display all receiver ports that are currently members of an IP multicast group.

show mvr members [ip-address] [ | {begin | exclude | include} expression]

Syntax Description

ip-address	(Optional) The IP multicast address. If the address is entered, all receiver ports that are members of the multicast group are displayed. If no address is entered, all members of all Multicast VLAN Registration (MVR) groups are listed. If a group has no members, the group is listed as Inactive.
| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

The show mvr members command applies to receiver ports only. For MVR compatible mode, all source ports are members of all multicast groups.

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

Examples

This is an example of output from the show mvr members command:

Switch# show mvr members

MVR Group IP    Status          Members

------------    ------          -------

239.255.0.1     ACTIVE          Gi0/1(d), Gi0/5(s)

239.255.0.2     INACTIVE        None

239.255.0.3     INACTIVE        None

239.255.0.4     INACTIVE        None

239.255.0.5     INACTIVE        None

239.255.0.6     INACTIVE        None

239.255.0.7     INACTIVE        None

239.255.0.8     INACTIVE        None

239.255.0.9     INACTIVE        None

239.255.0.10    INACTIVE        None

<output truncated>

239.255.0.255   INACTIVE        None

239.255.1.0     INACTIVE        None 

This is an example of output from the show mvr members 239.255.0.2 command. It shows how to view the members of the IP multicast group 239.255.0.2:

Switch# show mvr members 239.255.0.2

239.255.0.2     ACTIVE          Gi0/1(d), Gi0/2(d), Gi0/3(d), 

                                Gi0/4(d), Gi0/5(s)

Related Commands

Command	Description
mvr (global configuration)	Enables and configures multicast VLAN registration on the switch.
mvr (interface configuration)	Configures MVR ports.
show mvr	Displays the global MVR configuration on the switch.
show mvr interface	Displays the configured MVR interfaces, status of the specified interface, or all multicast groups to which the interface belongs when the members keyword is appended to the command.

show pagp

Use the show pagp privileged EXEC command to display Port Aggregation Protocol (PAgP) channel-group information.

show pagp [channel-group-number] {counters | internal | neighbor} [ | {begin | exclude | include} expression]

Syntax Description

channel-group-number	(Optional) Number of the channel group. Valid numbers range from 1 to 64.
counters	Display traffic information.
internal	Display internal information.
neighbor	Display neighbor information.
| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

You can enter any show pagp command to display the active port channel information. To display the nonactive information, enter the show pagp command with a group number.

Examples

This is an example of output from the show pagp 1 counters command:

Switch# show pagp 1 counters

           Information        Flush

Port       Sent   Recv     Sent   Recv

--------------------------------------

Channel group: 1

  Gi0/1    45     42       0      0 

  Gi0/2    45     41       0      0 

This is an example of output from the show pagp 1 internal command:

Switch# show pagp 1 internal

Flags:  S - Device is sending Slow hello.  C - Device is in Consistent state.

        A - Device is in Auto mode.

Timers: H - Hello timer is running.        Q - Quit timer is running.

        S - Switching timer is running.    I - Interface timer is running.

Channel group 1

                                Hello    Partner  PAgP     Learning  Group

Port      Flags State   Timers  Interval Count   Priority   Method  Ifindex

Gi0/1     SC    U6/S7   H       30s      1        128        Any      16

Gi0/2     SC    U6/S7   H       30s      1        128        Any      16

This is an example of output from the show pagp 1 neighbor command:

Switch# show pagp 1 neighbor

Flags:  S - Device is sending Slow hello.  C - Device is in Consistent state.

        A - Device is in Auto mode.        P - Device learns on physical port.

Channel group 1 neighbors

          Partner              Partner          Partner         Partner Group

Port      Name                 Device ID        Port       Age  Flags   Cap.

Gi0/1     vegas-p2             0002.4b29.4600   Gi0/1        9s SC      10001 

Gi0/2     vegas-p2             0002.4b29.4600   Gi0/2       24s SC      10001 

Related Commands

Command	Description
clear pagp	Clears PAgP channel-group information.

show policy-map

Use the show policy-map privileged EXEC command to display quality of service (QoS) policy maps, which define classification criteria for incoming traffic. Policy maps can include policers that specify the bandwidth limitations and the action to take if the limits are exceeded.

show policy-map [policy-map-name [class class-name]] [ | {begin | exclude | include} expression]

Syntax Description

policy-map-name	(Optional) Display the specified policy-map name.
class class-name	(Optional) Display QoS policy actions for a individual class.
| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

---

Note Though visible in the command-line help string, the interface keyword is not supported, and the statistics shown in the display should be ignored.

---

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.
12.1(6)EA1	The class keyword was added.

Usage Guidelines

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

Examples

This is an example of output from the show policy-map command:

Switch# show policy-map

Policy Map policy1

  class  class1

   set ip dscp 7

Policy Map policy3

  class  class99

   police 96000 999999 exceed-action drop

  class  class3

   police 8000 98989 exceed-action drop

  class  class20

   police 8000 9090 exceed-action drop

  class  class21

   police 904000 9090909 exceed-action policed-dscp-transmit

  class  class22

   police 904000 9090909 exceed-action policed-dscp-transmit 

Related Commands

Command	Description
policy-map	Creates or modifies a policy map that can be attached to multiple interfaces to specify a service policy.

show port-security

Use the show port-security privileged EXEC command to display port-security settings for an interface or for the switch.

show port-security [interface interface-id] [address] [ | {begin | exclude | include} expression]

Syntax Description

interface interface-id	(Optional) Display port security settings for the specified interface.
address	(Optional) Display all secure MAC addresses on all ports or the specified port.
| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(8)EA1	This command was first introduced.

Usage Guidelines

If you enter the command without keywords, the output includes the administrative and operational status of all secure ports on the switch. If you enter an interface-id, the output displays port security settings for the interface.

The show port-security address command displays all secure MAC addresses on the switch or on the specified interface.

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

Examples

This is an example of the output from the show port-security privileged EXEC command when no interface is specified.

Switch# show port-security

Secure Port      MaxSecureAddr  CurrentAddr  SecurityViolation  Security Action

                    (Count)        (Count)      (Count)

-------------------------------------------------------------------------------

     Fa0/12          25            1             0            Restrict

     Fa0/22          15            1             0            Protect

This is an example of the output from the show port-security privileged EXEC command for a specified interface:

Switch# show port-security interface fastethernet0/12

Security Enabled:Yes, Port Status:SecureUp

Violation Mode:Restrict

Max. Addrs:25, Current Addrs:1, Configure Addrs:1

This is an example of output from the show port-security address privileged EXEC command.

Switch# show port-security address

          Secure Mac Address Table

------------------------------------------------------------

Vlan    Mac Address       Type                Ports

----    -----------       ----                -----

   1    1000.2000.3000    SecureConfigured     Fa0/12

This is an example of output from the show port-security address privileged EXEC command for a specified interface.

Switch# show port-security interface fastethernet0/12 address

          Secure Mac Address Table

------------------------------------------------------------

Vlan    Mac Address       Type                Ports

----    -----------       ----                -----

   1    1000.2000.3000    SecureConfigured     Fa0/12

-----------------------------------------------------

Total Addresses: 1

Related Commands

Command	Description
switchport port-security	Enables or configures port security on an interface.

show proposed

Use the show proposed VLAN configuration command to display the proposed VLAN database or a selected VLAN from it.

show proposed [vlan-id]

Syntax Description

vlan-id

(Optional) ID of the VLAN in the proposed database. If this variable is omitted, the entire VLAN database displays, included the pruning state and Version 2 mode. Valid IDs are from 1 to 1005; do not enter leading zeros.

Command Modes

VLAN configuration

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

If the variable vlan-id is omitted, the show proposed command displays the entire proposed VLAN database.

The proposed VLAN database is not the running configuration until you use the exit or apply VLAN configuration command.

Examples

This is an example of output from the show proposed command:

Switch(vlan)# show proposed

VLAN ISL Id: 1

    Name: default

    Media Type: Ethernet

    VLAN 802.10 Id: 100001

    State: Operational

    MTU: 1500

    Translational Bridged VLAN: 1002

    Translational Bridged VLAN: 1003

  VLAN ISL Id: 2

    Name: VLAN0002

    Media Type: FDDI Net

    VLAN 802.10 Id: 100002

    State: Operational

    MTU: 1500

    STP Type: IBM

VLAN ISL Id: 1002

    Name: fddi-default

    Media Type: FDDI

    VLAN 802.10 Id: 101002

    State: Operational

    MTU: 1500

    Bridge Type: SRB

    Translational Bridged VLAN: 1

    Translational Bridged VLAN: 1003

VLAN ISL Id: 1003

    Name: trcrf-default

    Media Type: TRCRF

    VLAN 802.10 Id: 101003

    State: Operational

    MTU: 4472

    Bridge Type: SRB

    Ring Number: 3276

    Bridge Number: 1

    Parent VLAN: 1005

    Maximum ARE Hop Count: 7

    Maximum STE Hop Count: 7

    Backup CRF Mode: Disabled

    Translational Bridged VLAN: 1

    Translational Bridged VLAN: 1002

  VLAN ISL Id: 1004

    Name: fddinet-default

    Media Type: FDDI Net

    VLAN 802.10 Id: 101004

    State: Operational

    MTU: 1500

    Bridge Type: SRB

    Bridge Number: 1

    STP Type: IBM

VLAN ISL Id: 1005

    Name: trbrf-default

    Media Type: TRBRF

    VLAN 802.10 Id: 101005

    State: Operational

    MTU: 4472

    Bridge Type: SRB

    Bridge Number: 15

    STP Type: IBM 

Related Commands

Command	Description
show changes	Displays the differences between the VLAN database currently on the switch and the proposed VLAN database.
show current	Displays the current VLAN database on the switch or a selected VLAN from it.

show sdm prefer

Use the show sdm prefer privileged EXEC command to display information about the templates that can be used to maximize system resources for a particular feature, or use the command without a keyword to display the template currently in use.

show sdm prefer [access | default | routing | vlan] [ | {begin | exclude | include} expression]

Syntax Description

access	(Optional) Display the template that maximizes system resources for quality of service (QoS) classification and security access control entries (ACEs).
default	(Optional) Display the template that balances system resources among features.
routing	(Optional) Display the template that maximizes system resources for routing.
vlan	(Optional) Display the template that maximizes system resources for Layer 2 VLANs.
| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

If you did not reload the switch after entering the sdm prefer global configuration command, the show sdm prefer privileged EXEC command displays the template currently in use and not the newly configured template.

The numbers displayed for each template represent an approximate maximum number for each feature resource. The actual number might vary, depending on the actual number of other features configured. For example, in the default template if your switch had more than 16 routed interfaces (subnet VLANs), the number of possible unicast MAC addresses might be less than 6000.

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

Examples

This is an example of output from the show sdm prefer command on a Gigabit Ethernet switch, displaying the template currently in use.

Switch# show sdm prefer

The current template is default template.

 The selected template optimizes the resources in

 the switch to support this level of features for

 16 routed interfaces and 1K VLANs. 

 number of unicast mac addresses:  6K

 number of igmp groups:            6K

 number of qos aces:               2K

 number of security aces:          2K

 number of unicast routes:         12K

 number of multicast routes:       6K

This is an example of output from the show sdm prefer access command on a Gigabit Ethernet switch, displaying the access template characteristics:

Switch# show sdm prefer access

access template:

 The selected template optimizes the resources in

 the switch to support this level of features for

 16 routed interfaces and 1K VLANs.

 number of unicast mac addresses:  2K

 number of igmp groups:            8K

 number of qos aces:               2K

 number of security aces:          4K

 number of unicast routes:         4K

 number of multicast routes:       8K

Related Commandsnumber of multicast routes: 8K number of multicast routes: 8K

Command	Description
sdm prefer	Sets the SDM template to maximize feature resource utilization for QoS classification and security ACEs, routing, or VLANs, or to the default template.

show spanning-tree

Use the show spanning-tree privileged EXEC command to display spanning-tree state information.

show spanning-tree [bridge-group] [active | backbonefast | blockedports | bridge | brief | inconsistentports | interface interface-id | pathcost method | root | summary [totals] | uplinkfast | vlan vlan-id] [ | {begin | exclude | include} expression]

Syntax Description

bridge-group	(Optional) Specify the bridge group number. The range is 1 to 255.
active	(Optional) Display spanning-tree information on active interfaces only.
backbonefast	(Optional) Display spanning-tree BackboneFast status.
blockedports	(Optional) Display blocked port information.
bridge	(Optional) Display status and configuration of this switch.
brief	(Optional) Specify a brief summary of interface information.
inconsistentports	(Optional) Display inconsistent port information.
interface interface-id	(Optional) List of interfaces for which spanning-tree information is displayed. Enter each interface separated by a space. Ranges are not supported. Valid interfaces include physical ports and VLANs.
pathcost method	(Optional) Display the default path cost method.
root	(Optional) Display root switch status and configuration.
summary	(Optional) Specify a summary of port states.
total	(Optional) Display the total lines of the spanning-tree state section.
uplinkfast	(Optional) Display spanning-tree UplinkFast status.
vlan vlan-id	(Optional) Specify the VLAN ID. The range is 1 to 1005.
| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

Examples

This is an example of output from the show spanning-tree active command:

Switch# show spanning-tree active

VLAN1 is executing the ieee compatible Spanning Tree protocol

  Bridge Identifier has priority 32768, sysid 1, address 0002.4b29.2e01

  Configured hello time 2, max age 20, forward delay 15

  Current root has priority 32768, address 0001.42e2.cdca

  Root port is 1 (GigabitEthernet0/1), cost of root path is 38

  Topology change flag not set, detected flag not set

  Number of topology changes 27 last change occurred 01:22:46 ago

          from GigabitEthernet0/8

  Times:  hold 1, topology change 35, notification 2

          hello 2, max age 20, forward delay 15

  Timers: hello 0, topology change 0, notification 0, aging 0

 Port 1 (GigabitEthernet0/1) of VLAN1 is forwarding

   Port path cost 19, Port priority 128, Port Identifier 128.1.

   Designated root has priority 32768, address 0001.42e2.cdca

   Designated bridge has priority 32768, address 0030.946c.d740

   Designated port id is 128.26, designated path cost 19

   Timers: message age 2, forward delay 0, hold 0

   Number of transitions to forwarding state: 1

   BPDU: sent 44, received 16139 

<output truncated> 

This is an example of output from the show spanning-tree brief command:

Switch# show spanning-tree brief

VLAN1

  Spanning tree enabled protocol ieee

  Root ID    Priority    32768

             Address     0001.42e2.cdca

             Cost        38

             Port        1 (GigabitEthernet0/1)

             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

  Bridge ID  Priority    32768

             Address     0002.4b29.2e01

             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

             Aging Time 0

Interface                                   Designated

Name                 Port ID Prio Cost  Sts Cost  Bridge ID            Port ID

-------------------- ------- ---- ----- --- ----- -------------------- -------

GigabitEthernet0/1   128.1    128    19 FWD    19 32768 0030.946c.d740 128.26

GigabitEthernet0/6   128.6    128     4 FWD    38 32768 0002.4b29.2e01 128.6

GigabitEthernet0/7   128.7    128    19 FWD    38 32768 0002.4b29.2e01 128.7

GigabitEthernet0/8   128.8    128    19 FWD    38 32768 0002.4b29.2e01 128.8

GigabitEthernet0/10  128.10   128    19 FWD    38 32768 0002.4b29.2e01 128.10 

This is an example of output from the show spanning-tree interface gigabitethernet 0/1 command:

Switch# show spanning-tree interface gigabitethernet0/1

Port 1 (GigabitEthernet0/1) of VLAN1 is forwarding

   Port path cost 19, Port priority 128, Port Identifier 128.1.

   Designated root has priority 32768, address 0001.42e2.cdca

   Designated bridge has priority 32768, address 0030.946c.d740

   Designated port id is 128.26, designated path cost 19

   Timers: message age 2, forward delay 0, hold 0

   Number of transitions to forwarding state: 1

   BPDU: sent 44, received 16189 

This is an example of output from the show spanning-tree summary command:

Switch# show spanning-tree summary

Root bridge for: none.

Extended system ID is enabled

PortFast BPDU Guard is disabled

EtherChannel misconfiguration guard is enabled

UplinkFast is disabled

BackboneFast is disabled

Default pathcost method used is short 

Name                 Blocking Listening Learning Forwarding STP Active

-------------------- -------- --------- -------- ---------- ----------

VLAN1                13       0         0        1          14

VLAN2                1        0         0        1          2

VLAN3                1        0         0        1          2

<output truncated>

Related Commands

Command	Description
spanning-tree backbonefast	Enables the BackboneFast feature.
spanning-tree cost	Configures the path cost for STP calculations.
spanning-tree etherchannel guard misconfig	Enables the EtherChannel guard feature, and displays an error message when a loop caused by a channel misconfiguration is detected.
spanning-tree guard	Enables the root guard feature for all the VLANs associated with the interface.
spanning-tree extend system-id	Enables the extended system ID feature.
spanning-tree portfast	Enables the Port Fast feature on an interface and all its associated VLANs.
spanning-tree portfast bpduguard	Globally enables the Bridge Protocol Data Unit (BPDU) guard feature on the switch and shuts down Port Fast-configured interfaces.
spanning-tree port-priority	Configures an interface priority, which is used when two switches tie for position as the root switch.
spanning-tree uplinkfast	Accelerates the choice of a new root port when a link or switch fails or when STP reconfigures itself.
spanning-tree vlan	Configures STP on a per-VLAN basis.

show storm-control

Use the show storm-control privileged EXEC command to display broadcast, multicast, or unicast storm control settings on the switch or on the specified interface or to display storm-control history.

show storm-control [interface-id] [broadcast | multicast | unicast] [ | {begin | exclude | include} expression]

Syntax Description

interface-id	(Optional) Interface ID for the physical port.
broadcast	(Optional) Display broadcast storm threshold setting.
multicast	(Optional) Display multicast storm threshold setting.
unicast	(Optional) Display unicast storm threshold setting.
| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(8)EA1	This command was first introduced.

Usage Guidelines

When you enter an interface-id, the storm control thresholds are displayed for the specified interface.

If you do not enter an interface-id, settings are displayed for one traffic type for all ports on the switch.

If you do not enter a traffic type, settings are displayed for broadcast storm control.

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

Examples

This is an example of output from the show storm-control command when no keywords are entered. Because no traffic type keyword was entered, the broadcast storm control settings are displayed.

Switch# show storm-control

Interface  Filter State   Level    Current

---------  -------------  -------  -------

Fa0/1      inactive       100.00%  N/A

Fa0/2      inactive       100.00%  N/A

Fa0/3      inactive       100.00%  N/A

Fa0/4      inactive       100.00%  N/A

Fa0/5      inactive       100.00%  N/A

Fa0/6      inactive       100.00%  N/A

Fa0/7     Forwarding      50.00%    0.00%

Fa0/8      inactive       100.00%  N/A

<output truncated>

This is an example of output from the show storm-control command for a specified interface. Because no traffic type keyword was entered, the broadcast storm control settings are displayed.

Switch# show storm-control fastethernet0/17

Interface  Filter State   Level    Current

---------  -------------  -------  -------

Fa0/17     Forwarding      50.00%    0.00%

This is an example of output from the show storm-control command for a specified interface and traffic type, where no storm control threshold has been set for that traffic type on the specified interface.

Switch# show storm-control fastethernet0/17 multicast

Interface  Filter State   Level    Current

---------  -------------  -------  -------

Fa0/17     inactive       100.00%  N/A

<output truncated>

Table 2-18 describes the fields in the show storm-control display.

Table 2-18 show storm-control Field Descriptions 

Field	Description
Interface	Displays the ID of the interface.
Filter State	Displays the status of the filter: •Blocking—Storm control is enabled and a storm has occurred. •Forwarding—Storm control is enabled and no storms have occurred. •Inactive—Storm control is disabled.
Level	Displays the threshold level set on the interface for broadcast traffic or the specified traffic type (broadcast, multicast, or unicast).
Current	Displays the bandwidth utilization of broadcast traffic or the specified traffic type (broadcast, multicast, or unicast) as a percentage of total available bandwidth. This field is only valid when storm control is enabled.

Related Commands

Command	Description
storm-control	Sets the broadcast, multicast, or unicast storm control levels for the switch.

show system mtu

Use the show system mtu privileged EXEC command to display the global maximum transmission unit (MTU) or maximum packet size set for the switch.

show system mtu [ | {begin | exclude | include} expression]

Syntax Description

| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

If you have used the system mtu global configuration command to change the MTU setting, the new setting does not take effect until you reset the switch.

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

Examples

This is an example of output from the show system mtu command:

Switch# show system mtu

System MTU size is 1500 bytes

Related Commands

Command	Description
switchport unicast	Sets the maximum transmission unit (MTU) size for the switch.

show tcam

Use the show tcam privileged EXEC command to display information about the input security access control list (ACL) or output security ACL regions of the ternary content addressable memory (TCAM). Use the keywords to display information for a specific TCAM ID or specific characteristics.

show tcam {inacl | outacl} [tcam_id] {entries [tcam_id]} | {labels [tcam_id]} | {masks [tcam_id] | size | statistics [entries | hits | labels | masks]}[ | {begin | exclude | include} expression]

Syntax Description

inacl	Display information about the input security ACL TCAM portion.
outacl	Display information about the output security ACL TCAM portion.
tcam_id	(Optional) Display information for a specific TCAM ID. The range is 1-3 for Gigabit Ethernet switches and is always 1 for Fast Ethernet switches.
entries	Display one or all TCAM ACL entries and associated information. When all entries are displayed, the mask information is also displayed. This display output is a raw hex dump of information, intended for a Cisco technical support representative.
labels	Display entries and associated information for a feature manager label (see the show fm label command). This display output is a raw hex dump of information, intended for a Cisco technical support representative.
masks	Display mask information. This display output is a raw hex dump of information, intended for a Cisco technical support representative.
size	Display the size of the input or output ACL TCAM region.
statistics [entries | hits | labels | masks]	Display allocation statistics for the input or output ACL TCAM region. (Optional) Display allocation statistics for entries, hits, labels, or masks.
| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

These displays provide information that might be useful for Cisco technical support representatives troubleshooting the switch.

Examples

This is an example of output from the show tcam inacl entries command:

Switch# show tcam inacl entries

Number of active labels: 1

Label Value :       0

Number of entries : 8

Entry List

----------

Mask Index : 117

FC FF FF 00 00 00 00 00 00 80 FF 00 01 00 00 00 00 00

Entry Index : 929  Timestamp: 88

90 08 06 00 00 00 00 00 00 80 00 00 01 00 00 00 00 00 As Data(hex) : 00260086

Mask Index : 118

FE FF FF 00 00 00 00 00 00 80 FF 00 00 00 00 00 00 00

Entry Index : 944  Timestamp: 176

92 08 06 00 00 00 00 00 00 80 00 00 00 00 00 00 00 00 As Data(hex) : 00260086

Mask Index : 119

F6 00 00 00 00 00 00 00 00 80 FF 00 00 C0 00 FE 00 00

Entry Index : 945  Timestamp: 254

96 00 00 00 00 00 00 00 00 80 00 00 00 00 00 58 00 00 As Data(hex) : 00260086

Mask Index : 120

F6 00 00 00 00 00 00 00 00 80 FF 00 00 C0 00 FF 00 00

Entry Index : 960  Timestamp: 115

96 00 00 00 00 00 00 00 00 80 00 00 00 00 00 67 00 00 As Data(hex) : 00260086

Mask Index : 121

F7 00 00 00 00 00 00 00 00 80 FF 80 00 C0 00 00 FF FF

Mask Index : 122

F4 00 00 00 00 E0 00 00 00 80 FF 00 00 C0 00 FF 00 00

Entry Index : 976  Timestamp: 148

94 00 00 00 00 E0 00 00 00 80 00 00 00 00 00 09 00 00 As Data(hex) : 00260086

Mask Index : 123

F5 00 00 00 00 E0 00 00 00 80 FF 80 00 C0 00 00 FF FF

Entry Index : 977  Timestamp: 240

94 00 00 00 00 E0 00 00 00 80 00 00 00 40 00 00 02 08 As Data(hex) : 00260086

This is an example of output from the show tcam outacl masks command:

Switch# show tcam outacl masks

Number of active masks : 6

Mask Index : 0

F0 00 00 00 00 00 00 00 00 80 FF 00 00 00 00 00 00 00

Mask Index : 1

F0 00 00 00 00 00 00 00 00 80 FF 00 00 00 00 00 00 00

Mask Index : 124

F4 00 00 00 00 00 00 00 00 80 FF 00 00 00 00 00 00 00

Mask Index : 125

F4 00 00 00 00 00 00 00 00 80 FF 00 00 00 00 00 00 00

Mask Index : 126

F0 00 00 00 00 00 00 00 00 80 00 00 00 00 00 00 00 00

Mask Index : 127

F0 00 00 00 00 00 00 00 00 80 00 00 00 00 00 00 00 00 

This is an example of output from the show tcam inacl statistics command:

Switch# show tcam inacl statistics

Ingress ACL TCAM: Number of active labels: 1

Ingress ACL TCAM: Number of allocated masks: 13

Ingress ACL TCAM: Number of allocated entries: 28

This is an example of output from the show tcam outacl size command:

Switch# show tcam outacl size

Egress ACL TCAM Size: 1024 Entries 

Related Commands

Command	Description
show fm interface	Displays per-interface feature-manager information. Used with the show fm label command to show which features were able to fit into the hardware.
show fm label	Displays feature-manager information for a specified label to list features associated with the label that were not able to fit into hardware.

show tcam qos

Use the show tcam qos privileged EXEC command to display about the quality of service (QoS) region of the specified ternary content addressable memory (TCAM). Use the keywords to display information for a specific TCAM ID or specific characteristics.

show tcam qos tcam_id {entries [tcam_id]} | {labels [tcam_id]} | {masks [tcam_id] | size | statistics [entries | hits | labels | masks]}[ | {begin | exclude | include} expression]

Syntax Description

tcam_id	Identify the TCAM ID for displaying QoS TCAM information. The range is 1-3 for Gigabit Ethernet switches and is always 1 for Fast Ethernet switches.
entries	Display one or all TCAM QoS entries and associated information. When all entries are displayed, the mask information is also displayed. This display output is a raw hex dump of information, intended for a Cisco technical support representative.
labels	Display entries and associated information for a QoS label. This display output is a raw hex dump of information, intended for a Cisco technical support representative.
masks	Display mask information. This display output is a raw hex dump of information, intended for a Cisco technical support representative.
size	Display the size of the QoS TCAM region.
statistics [entries | hits | labels | masks]	Display allocation statistics for the QoS TCAM region. (Optional) Display allocation statistics for entries, hits, labels, or masks.
| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

These displays provide information that might be useful for Cisco technical support representatives troubleshooting the switch.

Examples

This is an example of output from the show tcam qos masks command for TCAM 2:

Switch# show tcam qos 2 masks

Number of active masks : 4

Mask Index : 252

F4 00 00 00 00 00 00 00 00 FF 00 00 00 00 00 00 00 00

Mask Index : 253

F4 00 00 00 00 00 00 00 00 FF 00 00 00 00 00 00 00 00

Mask Index : 254

F0 00 00 00 00 00 00 00 00 80 00 00 00 00 00 00 00 00

Mask Index : 255

F0 00 00 00 00 00 00 00 00 80 00 00 00 00 00 00 00 00

This is an example of output from the show tcam qos entries command for TCAM 1:

Switch# show tcam qos 1 entries

No active labels/entries

This is an example of output from the show tcam qos statistics command for TCAM 1:

Switch# show tcam qos 2 statistics

QoS TCAM #2: Number of active labels: 0

QoS TCAM#2: Number of allocated masks: 4

QoS TCAM#2: Number of allocated entries: 10                             

show udld

Use the show udld privileged EXEC command to display UniDirectional Link Detection (UDLD) administrative and operational status for all ports or the specified port.

show udld [interface-id] [ | {begin | exclude | include} expression]

Syntax Description

interface-id	(Optional) ID of the interface and port number. Valid interfaces include physical ports and VLANs. The VLAN range is 1 to 1001.
| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

If you do not enter an interface-id, administrative and operational UDLD status for all interfaces are displayed.

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

Examples

This is an example of output from the show udld gigabitethernet0/11 command. For this display, UDLD is enabled on both ends of the link, and UDLD detects that the link is bidirectional. Table 2-19 describes the fields in this display.

Switch# show udld gigabitethernet0/11

Interface gi0/11

---

Port enable administrative configuration setting: Follows device default

Port enable operational state: Enabled

Current bidirectional state: Bidirectional

Current operational state: Advertisement - Single Neighbor detected

Message interval: 60

Time out interval: 5

    Entry 1

    Expiration time: 146

    Device ID: 1

    Current neighbor state: Bidirectional

    Device name: 0050e2826000  

    Port ID: Gi0/12

    Neighbor echo 1 device: SAD03160954

    Neighbor echo 1 port: Gi0/11 

    Message interval: 5

    CDP Device name: 066527791 

Table 2-19 show udld Field Descriptions 

Field	Description
Interface	The interface on the local device configured for UDLD.
Port enable administrative configuration setting	How UDLD is configured on the port. If UDLD is enabled or disabled, the port enable configuration setting is the same as the operational enable state. Otherwise, the enable operational setting depends on the global enable setting.
Port enable operational state	Operational state that shows whether UDLD is actually running on this port.
Current bidirectional state	The bidirectional state of the link. An unknown state is displayed if the link is down or if it is connected to an UDLD-incapable device. A bidirectional state is displayed if the link is a normal two-way connection to a UDLD-capable device. All other values mean miswiring.
Current operational state	The current phase of the UDLD state machine. For a normal bidirectional link, the state machine is most often in the Advertisement phase.
Message interval	How often advertisement messages are sent from the local device. Measured in seconds.
Time out interval	The time period, in seconds, that UDLD waits for echoes from a neighbor device during the detection window.
Entry 1	Information from the first cache entry, which contains a copy of echo information received from the neighbor.
Expiration time	The amount of time in seconds remaining before this cache entry is aged out.
Device ID	The neighbor device identification.
Current neighbor state	The neighbor's current state. If both the local and neighbor devices are running UDLD normally, the neighbor state and local state should be bidirectional. If the link is down or the neighbor is not UDLD-capable, no cache entries are displayed.
Device name	The neighbor MAC address.
Port ID	The neighbor port ID enabled for UDLD.
Neighbor echo 1 device	The MAC address of the neighbors' neighbor from which the echo originated.
Neighbor echo 1 port	The port number ID of the neighbor from which the echo originated.
Message interval	The rate, in seconds, at which the neighbor is sending advertisement messages.
CDP device name	CDP name of the device.

Related Commands

Command	Description
udld (global configuration)	Enables aggressive or normal mode in UDLD or sets the configurable message timer time.
udld (interface configuration)	Enables UDLD on an individual interface or prevents a fiber-optic interface from being enabled by the udld global configuration command.
udld reset	Resets all interfaces shutdown by UDLD and permits traffic to begin passing through them again.

show version

Use the show version privileged EXEC command to display version information for the hardware and firmware.

show version [ | {begin | exclude | include} expression]

Syntax Description

| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

Examples

This is an example of output from the show version command:

Switch# show version

Cisco Internetwork Operating System Software

IOS (tm) C3550 Software (C3550-I5Q3L2-M), Version 12.1(0.0.37)EA1, BETA TEST SOFTWARE

Copyright (c) 1986-2001 by cisco Systems, Inc.

Compiled Tue 09-Oct-01 06:27 by devgoyal

Image text-base: 0x00003000, data-base: 0x006191D0

ROM: Bootstrap program is C3550 boot loader

NMS-Perdido-12T-202 uptime is 2 weeks, 1 day, 14 hours, 29 minutes

System returned to ROM by power-on

System image file is "flash:c3550-i5q3l2-mz.121-0.0.37.EA1/c3550-i5q3l2-mz.121-0

.0.37.EA1.bin"

cisco WS-C3550-12T (PowerPC) processor with 65526K/8192K bytes of memory.

Last reset from warm-reset

Bridging software.

Running Layer2/3 Switching Image

Ethernet-controller 1 has 1 Gigabit  Ethernet/IEEE 802.3 interfaces

Ethernet-controller 2 has 1 Gigabit  Ethernet/IEEE 802.3 interfaces

Ethernet-controller 3 has 1 Gigabit  Ethernet/IEEE 802.3 interfaces

Ethernet-controller 4 has 1 Gigabit  Ethernet/IEEE 802.3 interfaces

Ethernet-controller 5 has 1 Gigabit  Ethernet/IEEE 802.3 interfaces

Ethernet-controller 6 has 1 Gigabit  Ethernet/IEEE 802.3 interfaces

Ethernet-controller 7 has 1 Gigabit  Ethernet/IEEE 802.3 interfaces

Ethernet-controller 8 has 1 Gigabit  Ethernet/IEEE 802.3 interfaces

Ethernet-controller 9 has 1 Gigabit  Ethernet/IEEE 802.3 interfaces

Ethernet-controller 10 has 1 Gigabit  Ethernet/IEEE 802.3 interfaces

Ethernet-controller 11 has 1 Gigabit  Ethernet/IEEE 802.3 interfaces

Ethernet-controller 12 has 1 Gigabit  Ethernet/IEEE 802.3 interfaces

12 Gigabit Ethernet/IEEE 802.3 interface(s)

The password-recovery mechanism is enabled.

32K bytes of flash-simulated nonvolatile configuration memory.

Base ethernet MAC Address: 00:02:4B:29:2E:00

Configuration register is 0x10F

show vlan

Use the show vlan privileged EXEC command to display the parameters for all configured VLANs or one VLAN (if the VLAN ID or name is specified) in the administrative domain.

show vlan [brief | id vlan-id | name vlan-name] [ | {begin | exclude | include} expression]

Syntax Description

brief	(Optional) Display one line for each VLAN with the VLAN name, status, and its ports
id vlan-id	(Optional) Display information about a single VLAN identified by VLAN ID number. Valid IDs are from 1 to 1005; do not enter leading zeros.
name vlan-name	(Optional) Display information about a single VLAN identified by VLAN name. The VLAN name is an ASCII string from 1 to 32 characters.
| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

Examples

This is an example of output from the show vlan command:

Switch# show vlan

VLAN Name                             Status    Ports

---- -------------------------------- --------- -------------------------------

1    default                          active    Gi0/1, Gi0/2, Gi0/3, Gi0/4

                                                Gi0/5, Gi0/6, Gi0/7, Gi0/8

                                                Gi0/9, Gi0/10, Gi0/11, Gi0/12

1002 fddi-default                     active

1003 token-ring-default               active

1004 fddinet-default                  active

1005 trnet-default                    active

VLAN Type  SAID       MTU   Parent RingNo BridgeNo Stp  BrdgMode Trans1 Trans2

---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------

1    enet  100001     1500  -      -      -        -    -        1002   1003

1002 fddi  101002     1500  -      -      -        -    -        1      1003

1003 tr    101003     1500  1005   0      -        -    srb      1      1002

1004 fdnet 101004     1500  -      -      1        ibm  -        0      0

1005 trnet 101005     1500  -      -      1        ibm  -        0      0

This is an example of output from the show vlan brief command:

Switch# show vlan brief

VLAN Name                             Status    Ports

---- -------------------------------- --------- -------------------------------

1    default                          active    Gi0/1, Gi0/2, Gi0/3, Gi0/4

                                                Gi0/5, Gi0/6, Gi0/7, Gi0/8

                                                Gi0/9, Gi0/10, Gi0/11, Gi0/12

1002 fddi-default                     active

1003 token-ring-default               active

1004 fddinet-default                  active

1005 trnet-default                    active

This is an example of output from the show vlan id 1 command. You would see the same output if you entered the show vlan name default command:

Switch# show vlan id 1

VLAN Name                             Status    Ports

---- -------------------------------- --------- -------------------------------

1    default                          active    Gi0/1, Gi0/2, Gi0/3, Gi0/4

                                                Gi0/5, Gi0/6, Gi0/7, Gi0/8

                                                Gi0/9, Gi0/10, Gi0/11, Gi0/12

VLAN Type  SAID       MTU   Parent RingNo BridgeNo Stp  BrdgMode Trans1 Trans2

---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------

1    enet  100001     1500  -      -      -        -    -        1002   1003 

Table 2-20 show vlan Command Output Fields 

Field	Description
VLAN	VLAN number.
Name	Name, if configured, of the VLAN.
Status	Status of the VLAN (active or suspend).
Ports	Ports that belong to the VLAN.
Type	Media type of the VLAN.
SAID	Security association ID value for the VLAN.
MTU	Maximum transmission unit size for the VLAN.
Parent	Parent VLAN, if one exists.
RingNo	Ring number for the VLAN, if applicable.
BrdgNo	Bridge number for the VLAN, if applicable.
Stp	Spanning Tree Protocol type used on the VLAN.
BrdgMode	Bridging mode for this VLAN—possible values are source-route bridging (SRB) and source-route transparent (SRT); the default is SRB.
Trans1	Translation bridge 1.
Trans2	Translation bridge 2.
AREHops	Maximum number of hops for All-Routes Explorer frames—possible values are 1 through 13; the default is 7.
STEHops	Maximum number of hops for Spanning-Tree Explorer frames—possible values are 1 through 13; the default is 7.
Backup CRF	Status of whether or not the Token Ring concentrator relay function (TrCRF) is a backup path for traffic.

Related Commands

Command	Description
switchport mode	Configures the VLAN membership mode of a port.
vlan	Configures VLAN characteristics.

show vlan access-map

Use the show vlan access-map privileged EXEC command to display information about a particular VLAN access map or all VLAN access maps.

show vlan access-map [mapname] [ | {begin | exclude | include} expression]

Syntax Description

mapname	(Optional) Name of a specific VLAN access map.
| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

Examples

This is an example of output from the show vlan access-map command:

Switch# show vlan access-map

Vlan access-map "map_1" 10

  Match clauses:

     ip address: ip1

  Action:

     drop

Vlan access-map "map_1" 20

  Match clauses:

     mac address: mac1

  Action:

     forward

Vlan access-map "map_1" 30

  Match clauses:

  Action:

     drop

Related Commands

Command	Description
vlan access-map	Creates a VLAN map entry for VLAN packet filtering.
vlan filter	Applies a VLAN map to one or more VLANs.
show vlan filter	Displays information about all VLAN filters or about a particular VLAN or VLAN access map.

show vlan filter

Use the show vlan filter privileged EXEC command to display information about all VLAN filters or about a particular VLAN or VLAN access map.

show vlan filter [access-map name | vlan vlan-id] [ | {begin | exclude | include} expression]

Syntax Description

access-map name	(Optional) Display filtering information for the specified VLAN access map.
vlan vlan-id	(Optional) Display filtering information for the specified VLAN.
| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

Examples

This is an example of output from the show vlan filter command:

Switch# show vlan filter 

VLAN Map map_1 is filtering VLANs:

  20-22

Related Commands

Command	Description
show vlan access-map	Displays information about a particular VLAN access map or all VLAN access maps.
vlan access-map	Creates a VLAN map entry for VLAN packet filtering.
vlan filter	Applies a VLAN map to one or more VLANs.

show vmps

Use the show vmps privileged EXEC command without keywords to display the VLAN Query Protocol (VQP) version, reconfirmation interval, retry count, VLAN Membership Policy Server (VMPS) IP addresses, and the current and primary servers, or use the statistics keyword to display client-side statistics.

show vmps [statistics] [ | {begin | exclude | include} expression]

Syntax Description

statistics	(Optional) Display VQP client-side statistics and counters.
| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

Examples

This is an example of output from the show vmps command:

Switch# show vmps

VQP Client Status:

--------------------

VMPS VQP Version:   1

Reconfirm Interval: 60 min

Server Retry Count: 3

VMPS domain server:

Reconfirmation status

---------------------

VMPS Action:         other

This is an example of output from the show vmps statistics command. Table 2-21 describes each field in the display.

Switch# show vmps statistics

VMPS Client Statistics

----------------------

VQP  Queries:               0

VQP  Responses:             0

VMPS Changes:               0

VQP  Shutdowns:             0

VQP  Denied:                0

VQP  Wrong Domain:          0

VQP  Wrong Version:         0

VQP  Insufficient Resource: 0 

Table 2-21 show vmps statistics Field Descriptions 

Field	Description
VQP Queries	Number of queries sent by the client to the VMPS.
VQP Responses	Number of responses sent to the client from the VMPS.
VMPS Changes	Number of times that the VMPS changed from one server to another.
VQP Shutdowns	Number of times the VMPS sent a response to shut down the port. The client disables the port and removes all dynamic addresses on this port from the address table. You must administratively re-enable the port to restore connectivity.
VQP Denied	Number of times the VMPS denied the client request for security reasons. When the VMPS response denies an address, no frame is forwarded to or from the workstation with that address (broadcast or multicast frames are delivered to the workstation if the port has been assigned to a VLAN). The client keeps the denied address in the address table as a blocked address to prevent more queries from being sent to the VMPS for each new packet received from this workstation. The client ages the address if no new packets are received from this workstation on this port within the aging time period.
VQP Wrong Domain	Number of times the management domain in the request does not match the one for the VMPS. Any previous VLAN assignments of the port are not changed. This response means that the server and the client have not been configured with the same VTP management domain.
VQP Wrong Version	Number of times the version field in the query packet contains a value that is higher than the version supported by the VMPS. The VLAN assignment of the port is not changed. The switches send only VMPS version 1 requests.
VQP Insufficient Resource	Number of times the VMPS is unable to answer the request because of a resource availability problem. If the retry limit has not yet been reached, the client repeats the request with the same server or with the next alternate server, depending on whether the per-server retry count has been reached.

Related Commands

Command	Description
clear vmps statistics	Clears the statistics maintained by the VQP client.
vmps reconfirm (privileged EXEC)	Sends VQP queries to reconfirm all dynamic VLAN assignments with the VMPS.
vmps retry	Configures the per-server retry count for the VQP client.
vmps server	Configures the primary VMPS and up to three secondary servers.

show vtp

Use the show vtp privileged EXEC command to display general information about the VLAN Trunking Protocol (VTP) management domain, status, and counters.

show vtp {counters | status} [ | {begin | exclude | include} expression]

Syntax Description

counters	Display the VTP statistics for the switch.
status	Display general information about the VTP management domain status.
| begin	(Optional) Display begins with the line that matches the expression.
| exclude	(Optional) Display excludes lines that match the expression.
| include	(Optional) Display includes lines that match the specified expression.
expression	Expression in the output to use as a reference point.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output are not displayed, but the lines that contain Output are displayed.

Examples

This is an example of output from the show vtp counters command. Table 2-22 describes each field in the display.

Switch# show vtp counters

VTP statistics:

Summary advertisements received    : 38

Subset advertisements received     : 0

Request advertisements received    : 0

Summary advertisements transmitted : 13

Subset advertisements transmitted  : 3

Request advertisements transmitted : 0

Number of config revision errors   : 0

Number of config digest errors     : 0

Number of V1 summary errors        : 0

VTP pruning statistics:

Trunk            Join Transmitted Join Received    Summary advts received from

                                                   non-pruning-capable device

---------------- ---------------- ---------------- ---------------------------

Fa0/9               827              824              0

Fa0/10              827              823              0 

Fa0/11              827              823              0

Table 2-22 show vtp counters Field Descriptions 

Field	Description
Summary advertisements received	Number of summary advertisements received by this switch on its trunk ports. Summary advertisements contain the management domain name, the configuration revision number, the update timestamp and identity, the authentication checksum, and the number of subset advertisements to follow.
Subset advertisements received	Number of subset advertisements received by this switch on its trunk ports. Subset advertisements contain all the information for one or more VLANs.
Request advertisements received	Number of advertisement requests received by this switch on its trunk ports. Advertisement requests normally request information on all VLANs. They can also request information on a subset of VLANs.
Summary advertisements transmitted	Number of summary advertisements sent by this switch on its trunk ports. Summary advertisements contain the management domain name, the configuration revision number, the update timestamp and identity, the authentication checksum, and the number of subset advertisements to follow.
Subset advertisements transmitted	Number of subset advertisements sent by this switch on its trunk ports. Subset advertisements contain all the information for one or more VLANs.
Request advertisements transmitted	Number of advertisement requests sent by this switch on its trunk ports. Advertisement requests normally request information on all VLANs. They can also request information on a subset of VLANs.
Number of configuration revision errors	Number of revision errors. Whenever you define a new VLAN, delete an existing one, suspend or resume an existing VLAN, or modify the parameters on an existing VLAN, the configuration revision number of the switch increments. Revision errors increment whenever the switch receives an advertisement whose revision number matches the revision number of the switch, but the MD5 digest values do not match. This error means that the VTP password in the two switches is different or that the switches have different configurations. These errors means that the switch is filtering incoming advertisements, which causes the VTP database to become unsynchronized across the network.
Number of configuration digest errors	Number of MD5 digest errors. Digest errors increment whenever the MD5 digest in the summary packet and the MD5 digest of the received advertisement calculated by the switch do not match. This error usually means that the VTP password in the two switches is different. To solve this problem, make sure the VTP password on all switches is the same. These errors mean that the switch is filtering incoming advertisements, which causes the VTP database to become unsynchronized across the network.
Number of V1 summary errors	Number of version 1 errors. Version 1 summary errors increment whenever a switch in VTP V2 mode receives a VTP version 1 frame. These errors mean that at least one neighboring switch is either running VTP version 1 or VTP version 2 with V2-mode disabled. To solve this problem, change the configuration of the switches in VTP V2-mode to disabled.
Join Transmitted	Number of VTP pruning messages sent on the trunk.
Join Received	Number of VTP pruning messages received on the trunk.
Summary Advts Received from non-pruning-capable device	Number of VTP summary messages received on the trunk from devices that do not support pruning.

This is an example of output from the show vtp status command. Table 2-23 describes each field in the display.

Switch# show vtp status

VTP Version                     : 2

Configuration Revision          : 0

Maximum VLANs supported locally : 1005

Number of existing VLANs        : 5

VTP Operating Mode              : Server

VTP Domain Name                 :

VTP Pruning Mode                : Disabled

VTP V2 Mode                     : Disabled

VTP Traps Generation            : Disabled

MD5 digest                      : 0xBF 0x86 0x94 0x45 0xFC 0xDF 0xB5 0x70

Configuration last modified by 0.0.0.0 at 0-0-00 00:00:00

Local updater ID is 172.20.135.196 on interface Vl1 (lowest numbered VLAN interface found) 

Table 2-23 show vtp status Field Descriptions 

Field	Description
VTP Version	Displays the VTP version operating on the switch. By default, the switch implements version 1 but can be set to version 2.
Configuration Revision	Current configuration revision number on this switch.
Maximum VLANs Supported Locally	Maximum number of VLANs supported locally.
Number of Existing VLANs	Number of existing VLANs.
VTP Operating Mode	Displays the VTP operating mode, which can be server, client, or transparent. Server: a switch in VTP server mode is enabled for VTP and sends advertisements. You can configure VLANs on it. The switch guarantees that it can recover all the VLAN information in the current VTP database from nonvolatile RAM (NVRAM) after reboot. By default, every switch is a VTP server. Note The switch automatically changes from VTP server mode to VTP client mode if it detects a failure while writing the configuration to NVRAM and cannot return to server mode until the NVRAM is functioning. Client: a switch in VTP client mode is enabled for VTP, can send advertisements, but does not have enough nonvolatile storage to store VLAN configurations. You cannot configure VLANs on it. When a VTP client starts up, it does not send VTP advertisements until it receives advertisements to initialize its VLAN database. Transparent: a switch in VTP transparent mode is disabled for VTP, does not send or learn from advertisements sent by other devices, and cannot affect VLAN configurations on other devices in the network. The switch receives VTP advertisements and forwards them on all trunk ports except the one on which the advertisement was received.
VTP Domain Name	Name that identifies the administrative domain for the switch.
VTP Pruning Mode	Displays whether pruning is enabled or disabled. Enabling pruning on a VTP server enables pruning for the entire management domain. Pruning restricts flooded traffic to those trunk links that the traffic must use to access the appropriate network devices.
VTP V2 Mode	Displays if VTP version 2 mode is enabled. All VTP version 2 switches operate in version 1 mode by default. Each VTP switch automatically detects the capabilities of all the other VTP devices. A network of VTP devices should be configured to version 2 only if all VTP switches in the network can operate in version 2 mode.
VTP Traps Generation	Displays whether VTP traps are sent to a network management station.
MD5 Digest	A 16-byte checksum of the VTP configuration.
Configuration Last Modified	Displays the date and time of the last configuration modification. Displays the IP address of the switch that caused the configuration change to the database.

Related Commands

Command	Description
clear vtp counters	Clears the VTP and pruning counters.
vtp (VLAN configuration)	Configures the VTP mode.

shutdown

Use the shutdown interface configuration command to disable an interface. Use the no form of this command to restart a disabled port or switch virtual interface (SVI).

shutdown

no shutdown

Syntax Description

This command has no arguments or keywords.

Command Modes

Interface configuration

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

The shutdown command for a port causes it to stop forwarding. You can enable the port with the no shutdown command.

The no shutdown command has no effect if the port is a static-access port assigned to a VLAN that has been deleted, suspended, or shut down. The port must first be a member of an active VLAN before it can be re-enabled.

The shutdown command disables all functions on the specified interface.

This command also marks the interface as unavailable. To see if an interface is disabled, use the show interfaces privileged EXEC command. An interface that has been shut down is shown as administratively down in the display.

Examples

These examples show how to disable and re-enable an interface:

Switch(config)# interface gigabitethernet0/2

Switch(config-if)# shutdown

Switch(config)# interface gigabitethernet0/2

Switch(config-if)# no shutdown

You can verify your settings by entering the show interfaces privileged EXEC command.

Related Commands

Command	Description
show interfaces	Displays the statistical information specific to all interfaces or to a specific interface.

shutdown vlan

Use the shutdown vlan global configuration command to shut down (suspend) local traffic on the specified VLAN. Use the no form of this command to restart local traffic on the VLAN.

shutdown vlan vlan-id

no shutdown vlan vlan-id

Syntax Description

vlan-id

ID of the VLAN to be locally shut down. Valid IDs are from 2 to 1001, excluding VLANs defined as default VLANs under the VLAN Trunking Protocol (VTP). The default VLANs are 1 and 1002-1005. Do not enter leading zeros.

Defaults

No default is defined.

Command Modes

Global configuration

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

The shutdown vlan command does not change the VLAN information in the VTP database. It shuts down traffic locally, but the switch still advertises VTP information.

Examples

This example shows how to shutdown traffic on VLAN 2:

Switch(config)# shutdown vlan 2

You can verify your setting by entering the show vlan privileged EXEC command.

Related Commands

Command	Description
abort	Abandons the proposed VLAN database and exits VLAN configuration mode.
apply	Implements the proposed new VLAN database, increments the database configuration revision number, propagates it throughout the administrative domain, and remains in VLAN database mode.
flowcontrol	Implements the proposed new VLAN database, increments the database configuration number, propagates it throughout the administrative domain, and returns to privileged EXEC mode.
reset	Abandons the proposed VLAN database and remains in VLAN configuration mode. Resets the proposed database to the currently implemented VLAN database on the switch.
vlan database	Enters VLAN configuration mode from the command-line interface (CLI).

snmp-server enable traps

Use the snmp-server enable traps global configuration command to enable the switch to send Simple Network Management Protocol (SNMP) notification for various trap types to the network management system (NMS). Use the no form of this command to return to the default setting.

snmp-server enable traps [cluster | config | entity | hsrp | mac-notification | rtr | snmp | vtp]

no snmp-server enable traps [cluster | config | entity | hsrp | mac-notification | rtr | snmp | vtp]

Syntax Description

cluster	(Optional) Enable cluster traps.
config	(Optional) Enable SNMP configuration traps.
entity	(Optional) Enable SNMP entity traps.
hsrp	(Optional) Enable Hot Standby Router Protocol (HSRP) traps.
mac-notification	(Optional) Enable MAC address notification traps.
rtr	(Optional) Enable SNMP Response Time Reporter traps.
snmp	(Optional) Enable SNMP traps.
vtp	(Optional) Enable VLAN Trunking Protocol (VTP) traps.

Defaults

The sending of SNMP traps is disabled.

Command Modes

Global configuration

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.
12.1(8)EA1	The mac-notification keyword was added.

Usage Guidelines

Though visible in the command-line help string, the hsrp keyword takes affect only when the enhanced multilayer software image (EMI) is installed. All Catalyst 3550 Gigabit Ethernet switches ship with the EMI installed. Catalyst 3550 Fast Ethernet switches can be shipped with either the standard multilayer software image (SMI) or EMI pre-installed. You can order the Enhanced Multilayer Software Image Upgrade kit to upgrade Catalyst 3550 Fast Ethernet switches from the SMI to the EMI.

Specify the host (NMS) that receives the traps by using the snmp-server host global configuration command. If no trap types are specified, all trap types are sent.

Examples

This example shows how to send VTP traps to the NMS:

Switch(config)# snmp-server enable traps vtp

You can verify your setting by entering the show vtp status privileged EXEC or the show running-config privileged EXEC command.

Related Commands

Command	Description
show running-config	Displays the running configuration on the switch. For syntax information, select Cisco IOS Configuration Fundamentals Command Reference for Release 12.1 > Cisco IOS File Management Commands > Configuration File Commands.
snmp-server host	Specifies the host that receives SNMP traps.

snmp-server host

Use the snmp-server host global configuration command to specify the recipient (host) of a Simple Network Management Protocol (SNMP) notification operation. Use the no form of this command to remove the specified host.

snmp-server host host-addr {informs | traps} {version {1 | 2c}} community-string [cluster | config | entity | hsrp | mac-notification | rtr | snmp | tty | udp-port | vtp]

no snmp-server host host-addr {informs | traps} {version {1 | 2c}} community-string [cluster | config | entity | hsrp | mac-notification | rtr | snmp | tty | udp-port | vtp]

Syntax Description

host-addr	Name or Internet address of the host (the targeted recipient).
informs | traps	Send SNMP traps or informs to this host.
version 1 | 2c	Version of the Simple Network Management Protocol (SNMP) used to send the traps. These keywords are supported: 1—SNMPv1. This option is not available with informs. 2c—SNMPv2C.
community-string	Password-like community string sent with the notification operation. Though you can set this string by using the snmp-server host command, we recommend you define this string by using the snmp-server community global configuration command before using the snmp-server host command.
cluster	(Optional) Send cluster member status traps.
config	(Optional) Send SNMP configuration traps.
entity	(Optional) Send SNMP entity traps.
hsrp	(Optional) Send Hot Standby Router Protocol (HSRP) traps.
mac-notification	(Optional) Send MAC notification traps.
rtr	(Optional) Send SNMP Response Time Reporter traps.
snmp	(Optional) Send SNMP-type traps.
tty	(Optional) Send Transmission Control Protocol (TCP) connection traps.
udp-port	(Optional) Send notification host's User Datagram Protocol (UDP) port number.
vtp	(Optional) Enable VLAN Trunking Protocol (VTP) traps.

---

Note Though visible in the command-line help string, the version 3 keyword (SNMPv3) is not supported.

---

Defaults

This command is disabled by default. No notifications are sent.

If you enter this command with no keywords, the default is to send all trap types to the host. No informs are sent to this host.

If no version keyword is present, the default is version 1.

Though visible in the command-line help string, the hsrp keyword takes affect only when the enhanced multilayer software image (EMI) is installed. All Catalyst 3550 Gigabit Ethernet switches ship with the EMI installed. Catalyst 3550 Fast Ethernet switches can be shipped with either the standard multilayer software image (SMI) or EMI pre-installed. You can order the Enhanced Multilayer Software Image Upgrade kit to upgrade Catalyst 3550 Fast Ethernet switches from the SMI to the EMI.

---

Note If the community-string is not defined by using the snmp-server community global configuration command before using this command, the default form of the snmp-server community command is automatically inserted into the configuration. The password (community-string) used for this automatic configuration of the snmp-server community will be the same as that specified in the snmp-server host command.

---

Command Modes

Global configuration

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.
12.1(8)EA1	The mac-notification keyword was added.

Usage Guidelines

SNMP notifications can be sent as traps or inform requests. Traps are unreliable because the receiver does not send acknowledgments when it receives traps. The sender cannot determine if the traps were received. However, an SNMP entity that receives an inform request acknowledges the message with an SNMP response PDU. If the sender never receives the response, the inform request can be sent again. Thus, informs are more likely to reach their intended destinations.

However, informs consume more resources in the agent and in the network. Unlike a trap, which is discarded as soon as it is sent, an inform request must be held in memory until a response is received or the request times out. Traps are also sent only once, but an inform might be retried several times. The retries increase traffic and contribute to a higher overhead on the network.

If you do not enter an snmp-server host command, no notifications are sent. To configure the switch to send SNMP notifications, you must enter at least one snmp-server host command. If you enter the command with no keywords, all trap types are enabled for the host. To enable multiple hosts, you must issue a separate snmp-server host command for each host. You can specify multiple notification types in the command for each host.

When multiple snmp-server host commands are given for the same host and kind of notification (trap or inform), each succeeding command overwrites the previous command. Only the last snmp-server host command is in effect. For example, if you enter an snmp-server host inform command for a host and then enter another snmp-server host inform command for the same host, the second command replaces the first.

The snmp-server host command is used with the snmp-server enable traps global configuration command. Use the snmp-server enable traps command to specify which SNMP notifications are sent globally. For a host to receive most notifications, at least one snmp-server enable traps command and the snmp-server host command for that host must be enabled. Some notification types cannot be controlled with the snmp-server enable traps command. For example, some notification types are always enabled. Other notification types are enabled by a different command.

The no snmp-server host command with no keywords disables traps, but not informs, to the host. To disable informs, use the no snmp-server host informs command.

Examples

This example shows how to configure a unique SNMP community string named comaccess for traps and prevent SNMP polling access with this string through access-list 10:

Switch(config)# snmp-server community comaccess ro 10

Switch(config)# snmp-server host 172.20.2.160 comaccess

Switch(config)# access-list 10 deny any

This example shows how to send the SNMP traps to the host specified by the name myhost.cisco.com. The community string is defined as comaccess:

Switch(config)# snmp-server enable traps

Switch(config)# snmp-server host myhost.cisco.com comaccess snmp 

This example shows how to enable the switch to send all traps to the host myhost.cisco.com using the community string public:

Switch(config)# snmp-server enable traps

Switch(config)# snmp-server host myhost.cisco.com public

You can verify your settings by entering the show running-config privileged EXEC command.

Related Commands

Command	Description
show running-config	Displays the running configuration on the switch. For syntax information, select Cisco IOS Configuration Fundamentals Command Reference for Release 12.1 > Cisco IOS File Management Commands > Configuration File Commands.
snmp-server enable traps	Enables SNMP notification for various trap types.

snmp trap mac-notification

Use the snmp trap mac-notification interface configuration command to enable the Simple Network Management Protocol (SNMP) MAC address notification trap on a specific interface. Use the no form of this command to return to the default setting.

snmp trap mac-notification {added | removed}

no snmp trap mac-notification {added | removed}

Syntax Description

added	Enable the MAC notification trap whenever a MAC address is added on this interface.
removed	Enable the MAC notification trap whenever a MAC address is removed from this interface.

Defaults

By default, the traps for both address addition and address removal are disabled.

Command Modes

Interface configuration

Command History

Release	Modification
12.1(8)EA1	This command was first introduced.

Usage Guidelines

Even though you enable the notification trap for a specific interface by using the snmp trap mac-notification command, the trap is generated only when you enable the snmp-server enable traps mac-notification and the mac-address-table notification global configuration commands.

Examples

This example shows how to enable the MAC notification trap when a MAC address is added to Fast Ethernet interface 0/4:

Switch(config)# interface fastethernet0/4

Switch(config-if)# snmp trap mac-notification added

You can verify your settings by entering the show mac-address-table notification interface privileged EXEC command.

Related Commands

Command	Description
mac-address-table notification	Enables the MAC address notification feature.
show mac-address-table notification	Displays the MAC address notification settings for all interfaces or on the specified interface when the interface keyword is appended.
snmp-server enable traps	Sends the SNMP MAC notification traps when the mac-notification keyword is appended.

spanning-tree backbonefast

Use the spanning-tree backbonefast global configuration command to enable the BackboneFast feature. Use the no form of the command to return to the default setting.

spanning-tree backbonefast

no spanning-tree backbonefast

Syntax Description

This command has no arguments or keywords.

Defaults

BackboneFast is disabled.

Command Modes

Global configuration

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

BackboneFast is started when a root port or blocked port on a switch receives inferior bridge protocol data units (BPDUs) from its designated bridge. An inferior BPDU identifies one switch as both the root bridge and the designated bridge. When a switch receives an inferior BPDU, it means that a link to which the switch is not directly connected (an indirect link) has failed (that is, the designated bridge has lost its connection to the root switch). If there are alternate paths to the root switch, BackboneFast causes the maximum aging time on the ports on which it received the inferior BPDU to expire and allows a blocked port to move immediately to the listening state. BackboneFast then transitions the interface to the forwarding state. For more information, refer to the Catalyst 3550 Multilayer Switch Software Configuration Guide.

Enable BackboneFast on all the Catalyst 3550 switches to allow the detection of indirect link failures and to start the spanning-tree reconfiguration sooner.

Examples

This example shows how to enable BackboneFast on the switch:

Switch(config)# spanning-tree backbonefast

You can verify your setting by entering the show spanning-tree privileged EXEC command.

Related Commands

Command	Description
show spanning-tree	Displays spanning-tree information for the specified spanning-tree instances.

spanning-tree cost

Use the spanning-tree cost interface configuration command to set the path cost for Spanning Tree Protocol (STP) calculations. If a loop occurs, spanning tree considers the path cost when selecting an interface to place into the forwarding state. Use the no form of this command to return to the default setting.

spanning-tree [vlan vlan-id] cost cost

no spanning-tree [vlan vlan-id] cost

Syntax Description

vlan vlan-id	(Optional) VLAN ID associated with a spanning-tree instance. The range is 1 to 1005. Do not enter leading zeros.
cost	Path cost can range from 1 to 200000000 (for a physical port) or 1 to 65535 (for a VLAN), with higher values meaning higher costs.

Defaults

The default path cost is computed from the interface bandwidth setting. These are the IEEE default path cost values:

•1000 Mbps—4

•100 Mbps—19

•10 Mbps—100

Command Modes

Interface configuration

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

When you configure the cost, higher values represent higher costs.

Examples

This example shows how to set a path cost of 250 on an interface (an access port):

Switch(config)# interface gigabitethernet0/4

Switch(config-if)# spanning-tree cost 250

This example shows how to set a path cost of 300 for VLAN 10 on an interface that is a trunk port:

Switch(config-if)# spanning-tree vlan 10 cost 300

You can verify your settings by entering the show spanning-tree privileged EXEC command.

Related Commands

Command	Description
show spanning-tree	Displays spanning-tree information for the specified spanning-tree instances.
spanning-tree portfast	Enables the Port Fast feature on an interface in all its associated VLANs.
spanning-tree vlan priority	Configures the switch priority for the specified spanning-tree instance.

spanning-tree etherchannel guard misconfig

Use the spanning-tree etherchannel guard misconfig global configuration command to enable the EtherChannel guard feature and to display an error message when a loop caused by a channel misconfiguration is detected. Use the no form of this command to disable this feature.

spanning-tree etherchannel guard misconfig

no spanning-tree etherchannel guard misconfig

Syntax Description

This command has no arguments or keywords.

Defaults

The spanning-tree EtherChannel guard misconfiguration feature is enabled.

Command Modes

Global configuration

Command History

Release	Modification
12.1(8)EA1	This command was first introduced.

Usage Guidelines

To determine which local ports are involved in the misconfiguration, enter the show interfaces status err-disabled privileged EXEC command. To check the EtherChannel configuration on the remote device, enter the show etherchannel summary privileged EXEC command on the remote device.

After you correct the configuration, enter the shutdown and the no shutdown interface configuration commands on the associated port-channel interface.

Examples

This example shows how to disable the EtherChannel guard misconfiguration feature:

Switch(config)# no spanning-tree etherchannel guard misconfig

You can verify your setting by entering the show spanning-tree summary privileged EXEC command.

Related Commands

Command	Description
show spanning-tree summary	Displays spanning-tree information for the specified spanning-tree instances.

spanning-tree extend system-id

Use the spanning-tree extend system-id global configuration command to enable the extended system ID feature.

spanning-tree extend system-id

---

Note Though visible in the command-line help strings, the no version of this command is not supported. You cannot disable the extended system ID feature.

---

Syntax Description

This command has no arguments or keywords.

Defaults

The feature is enabled.

Command Modes

Global configuration

Command History

Release	Modification
12.1(8)EA1	This command was first introduced.

Usage Guidelines

In Release 12.1(8)EA1 and later, Catalyst 3550 switches support the 802.1T spanning-tree extensions, and some of the bits previously used for the switch priority are now used for the extended system ID (VLAN identifier). In earlier releases, the switch priority is a 16-bit value.

The Spanning Tree Protocol (STP) uses the extended system ID, the switch priority, and the allocated STP MAC address to make the bridge ID unique for each VLAN. With earlier releases, STP uses one MAC address per VLAN to make the bridge ID unique for each VLAN.

Support for the extended system ID affects how you manually configure the root switch, the secondary root switch, and the switch priority of a VLAN. For more information, see the spanning-tree vlan section.

If your network consists switches that do not support the extended system ID and switches that do support it, it is unlikely that the switch with the extended system ID support will become the root switch. The extended system ID increases the switch priority value every time the VLAN number is greater than the priority of the connected switches that are running older software.

Related Commands

Command	Description
show spanning-tree summary	Displays spanning-tree information for the specified spanning-tree instances.
spanning-tree vlan	Configures STP on a per-VLAN basis.

spanning-tree guard

Use the spanning-tree guard interface configuration command to enable the root guard feature for all the VLANs associated with the selected interface. Root guard restricts which interface is allowed to be the Spanning Tree Protocol (STP) root port or the path-to-the root for the switch. The root port provides the best path from the switch to the root switch. Use the no form of this command to return to the default setting.

spanning-tree guard {root | none}

no spanning-tree guard

Syntax Description

root	Enable the root guard feature.
none	Disable the root guard feature.

Defaults

The root guard feature is disabled.

Command Modes

Interface configuration

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

When the root guard feature is enabled, if spanning-tree calculations cause a port to be selected as the root port, the port transitions to the root-inconsistent (blocked) state to prevent the customer's switch from becoming the root switch or being in the path to the root.

When the no spanning-tree guard or the no spanning-tree guard none command is executed, the root guard feature is disabled for all VLANs on the selected interface. If this interface is in the root-inconsistent (blocked) state, it automatically transitions to the listening state.

Do not enable the root guard on interfaces that will be used by the UplinkFast feature. With UplinkFast, the backup interfaces (in the blocked state) replace the root port in the case of a failure. However, if root guard is also enabled, all the backup interfaces used by the UplinkFast feature are placed in the root-inconsistent state (blocked) and prevented from reaching the forwarding state.

Examples

This example shows how to enable the root guard feature on all the VLANs associated with the specified interface:

Switch(config)# interface gigabitethernet0/3

Switch(config-if)# spanning-tree guard root

You can verify your settings by entering the show running-config privileged EXEC command.

Related Commands

Command	Description
show running-config	Displays the current operating configuration. For syntax information, select Cisco IOS Configuration Fundamentals Command Reference for Release 12.1 > Cisco IOS File Management Commands > Configuration File Commands.
show spanning-tree	Displays spanning-tree information for the specified spanning-tree instances.
spanning-tree cost	Sets the path cost for STP calculations. If a loop occurs, spanning tree considers the path cost when selecting an interface to place into the forwarding state.
spanning-tree port-priority	Sets an interface priority, which is used when two switches tie for position as the root switch.
spanning-tree vlan priority	Sets the switch priority for the specified spanning-tree instance and affects the likelihood that the switch is selected as the root switch.

spanning-tree port-priority

Use the spanning-tree port-priority interface configuration command to configure an interface priority, which is used when two switches tie for position as the root switch. Use the no form of this command to return to the default setting.

spanning-tree [vlan vlan-id] port-priority priority

no spanning-tree [vlan vlan-id] port-priority

Syntax Description

vlan vlan-id	(Optional) VLAN ID associated with a spanning-tree instance. The range is 1 to 1005. Do not enter leading zeros.
priority	Number from 0 to 255. The lower the number, the higher the priority.

Defaults

The default port-priority is 128.

Command Modes

Interface configuration

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

If the variable vlan-id is omitted, the command applies to the spanning-tree instance associated with VLAN 1.

You can set the priority on a VLAN that has no interfaces assigned to it. The setting takes effect when you assign the interface to the VLAN.

Examples

This example shows how to increase the likelihood that the spanning-tree instance 20 is chosen as the root switch on the specified interface:

Switch(config)# interface gigabitethernet0/2

Switch(config-if)# spanning-tree vlan 20 port-priority 0

You can verify your settings by entering the show spanning-tree privileged EXEC command.

Related Commands

Command	Description
show spanning-tree	Displays spanning-tree information for the specified spanning-tree instances.

spanning-tree portfast

Use the spanning-tree portfast interface configuration command to enable the Port Fast feature on an interface in all its associated VLANs. When the Port Fast feature is enabled, the interface changes directly from a blocking state to a forwarding state without making the intermediate Spanning Tree Protocol (STP) state changes. Use the no form of this command to return to the default setting.

spanning-tree portfast

no spanning-tree portfast

Syntax Description

This command has no arguments or keywords.

Defaults

The Port Fast feature is disabled on all interfaces; however, it is automatically enabled on dynamic-access ports.

Command Modes

Interface configuration

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

Use this feature only on interfaces that connect to end stations; otherwise, an accidental topology loop could cause a data packet loop and disrupt switch and network operation.

This feature affects all VLANs on the interface.

A port with the Port Fast feature enabled is moved directly to the spanning-tree forwarding state without waiting the standard forward-time delay.

Examples

This example shows how to enable the Port Fast feature on an interface:

Switch(config)# interface gigabitethernet0/2

Switch(config-if)# spanning-tree portfast

You can verify your settings by entering the show running-config privileged EXEC command.

Related Commands

Command	Description
show spanning-tree	Displays spanning-tree information for the specified spanning-tree instances.
spanning-tree port-priority	Configures an interface priority, which is used when two switches tie for position as the root switch.
spanning-tree portfast bpduguard	Enables the Bridge Protocol Data Unit (BPDU) guard feature on the switch on Port Fast-configured interfaces.

spanning-tree portfast bpduguard

Use the spanning-tree portfast bpduguard global configuration command to globally enable the Bridge Protocol Data Unit (BPDU) guard feature on the switch. It shuts down Port Fast-configured interfaces that receive BPDUs rather than putting them into the spanning-tree blocking state. Use the no form of this command to return to the default setting.

spanning-tree portfast bpduguard

no spanning-tree portfast bpduguard

Syntax Description

This command has no arguments or keywords.

Defaults

The BPDU guard feature is disabled on the switch.

Command Modes

Global configuration

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

The BPDU guard feature works on interfaces that have the Port Fast feature enabled on them. Port Fast should be configured only on interfaces that connect to end stations; otherwise, an accidental topology loop could cause a data packet loop and disrupt switch and network operation. An interface with Port Fast mode enabled is moved directly to the spanning-tree forwarding state when linkup occurs, without waiting for the standard forward-time delay.

In a valid configuration, Port Fast-configured interfaces do not receive BPDUs. Receiving a BPDU on a Port Fast-configured interface signals an invalid configuration, such as the connection of an unauthorized device. If a BPDU is received on a Port-Fast configured interface, the BPDU guard feature places the interface into the ErrDisable state. The BPDU guard feature provides a secure response to invalid configurations because you must manually put the interface back in service.

Examples

This example shows how to enable the BPDU guard feature:

Switch(config)# spanning-tree portfast bpduguard

You can verify your setting by entering the show running-config privileged EXEC command.

Related Commands

Command	Description
show spanning-tree	Displays spanning-tree information for the specified spanning-tree instances.
spanning-tree portfast	Enables the Port Fast feature on an interface in all its associated VLANs.

spanning-tree stack-port

Use the spanning-tree stack-port interface configuration command to enable cross-stack UplinkFast (CSUF) on an interface and to accelerate the choice of a new root port when a link or switch fails or when Spanning Tree Protocol (STP) reconfigures itself. Use the no form of this command to return to the default setting.

spanning-tree stack-port

no spanning-tree stack-port

Syntax Description

This command has no arguments or keywords.

Defaults

CSUF is disabled on all interfaces.

Command Modes

Interface configuration

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

This command is effective only if you enable the UplinkFast feature by using the spanning-tree uplinkfast global configuration command.

Use this command only on access switches.

You can enable CSUF only on one stack-port Gigabit Interface Converter (GBIC) interface. The stack port connects to the GigaStack GBIC multidrop backbone. If you try to enable CSUF on a Fast Ethernet or a copper-based Gigabit Ethernet port, you receive an error message.

If CSUF is already enabled on an interface and you try to enable it on another interface, you receive an error message. You must disable CSUF on the first interface before enabling it on a new interface.

Examples

This example shows how to enable CSUF on the GBIC interface:

Switch(config)# interface gigabitethernet0/11

Switch(config-if)# spanning-tree stack-port 

You can verify your settings by entering the show spanning-tree privileged EXEC command.

Related Commands

Command	Description
show spanning-tree	Displays spanning-tree information for the specified spanning-tree instances.

spanning-tree uplinkfast

Use the spanning-tree uplinkfast global configuration command to accelerate the choice of a new root port when a link or switch fails or when Spanning Tree Protocol (STP) reconfigures itself. Use the no form of this command to return to the default setting.

spanning-tree uplinkfast [max-update-rate pkts-per-second]

no spanning-tree uplinkfast [max-update-rate]

Syntax Description

max-update-rate pkts-per-second

(Optional) The number of packets per second at which update packets are sent. The range is 0 to 65535.

Defaults

UplinkFast is disabled.

The update rate is 150 packets per second.

Command Modes

Global configuration

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

Use this command only on access switches.

When you enable UplinkFast, it is enabled for the entire switch and cannot be enabled for individual VLANs.

UplinkFast increases the switch priority to 49152 and adds 3000 to the STP path cost only if the port used the default path cost before enabling UplinkFast. If you changed the path cost before enabling UplinkFast, this value is not changed after enabling UplinkFast.

This changes to the switch priority and path cost reduces the chance that the switch will become the root switch. When spanning tree detects that the root port has failed, UplinkFast immediately switches over to an alternate root port, changing the new root port directly to FORWARDING state. During this time, a topology change notification is sent.

Do not enable the root guard on interfaces that will be used by the UplinkFast feature. With UplinkFast, the backup interfaces (in the blocked state) replace the root port in the case of a failure. However, if root guard is also enabled, all the backup interfaces used by the UplinkFast feature are placed in the root-inconsistent state (blocked) and prevented from reaching the forwarding state.

If you set the max-update-rate to 0, station-learning frames are not generated, so the STP topology converges more slowly after a loss of connectivity.

Examples

This example shows how to enable UplinkFast:

Switch(config)# spanning-tree uplinkfast 

You can verify your setting by entering the show spanning-tree privileged EXEC command.

Related Commands

Command	Description
show spanning-tree	Displays spanning-tree information for the specified spanning-tree instances.
spanning-tree vlan root primary	Forces this switch to be the root switch.

spanning-tree vlan

Use the spanning-tree vlan global configuration command to configure Spanning Tree Protocol (STP) on a per-VLAN basis. Use the no form of this command to return to the default setting.

spanning-tree vlan vlan-id {forward-time seconds | hello-time seconds | max-age seconds |
priority priority | {root {primary | secondary} [diameter net-diameter
[hello-time seconds]]}}

no spanning-tree vlan vlan-id [forward-time | hello-time | max-age | priority | root]

Syntax Description

vlan-id	VLAN ID associated with a spanning-tree instance. The range is 1 to 1005. Do not enter leading zeros.
forward-time seconds	Set the forward-delay time for the specified spanning-tree instance. The forwarding time determines how long each of the listening and learning states last before the interface begins forwarding. The range is 4 to 30 seconds.
hello-time seconds	Set the interval between hello Bridge Protocol Data Units (BPDUs) sent by the root switch configuration messages. The range is 1 to 10 seconds.
max-age seconds	Set the interval between messages the spanning tree receives from the root switch. If a switch does not receive a BPDU message from the root switch within this interval, it recomputes the STP topology. The range is 6 to 40 seconds.
priority priority	Set the switch priority for the specified spanning-tree instance. This setting affects the likelihood that the switch is selected as the root switch. The range is 0 to 61440 in increments of 4096. Valid priority values are 4096, 8192, 12288, 16384, 20480, 24576, 28672, 32768, 36864, 40960, 45056, 49152, 53248, 57344, and 61440. All other values are rejected.
root primary	Force this switch to be the root switch.
root secondary	Set this switch to be the root switch should the primary root switch fail.
diameter net-diameter	Set the maximum number of switches between any two end stations. The range is 2 to 7.

Defaults

Spanning tree is enabled on all VLANs.

The forward-delay time is 15 seconds.

The hello time is 2 seconds.

The max-age is 20 seconds.

The switch priority is 32768.

No STP root switch is configured.

Command Modes

Global configuration

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.
12.1(8)EA1	The range of value for priority priority changed from 1 to 65535 to 1 to 61440 (in increments of 4096).

Usage Guidelines

Disabling STP causes the VLAN to stop participating in STP. Interfaces that are administratively down remain down. Received Bridge Protocol Data Units (BPDUs) are forwarded like other multicast frames. The VLAN does not detect and prevent loops when STP is disabled.

You can disable STP on a VLAN that is not currently active and verify the change by using the show running-config or the show spanning-tree vlan vlan-id privileged EXEC command. The setting takes effect when the VLAN is activated.

When disabling or re-enabling STP, you must specify each VLAN you want to disable or enable on a single command line.

When an STP VLAN is disabled and then enabled, all assigned VLANs continue to be its members. However, all spanning-tree bridge parameters are returned to their previous settings (the last setting before the STP VLAN was disabled).

You can enable STP and any of its options on a VLAN that has no interfaces assigned to it. The setting takes effect when you assign interfaces to it.

When setting the max-age seconds, if a switch does not receive BPDUs from the root switch within the specified interval, it recomputes the spanning-tree topology. The max-age setting must be greater than the hello-time setting.

The spanning-tree vlan vlan-id root command should be used only on backbone switches.

When you enter the spanning-tree vlan vlan-id root command, the software checks the switch priority of the current root switch for each VLAN. Because of the extended system ID support, the switch sets the switch priority for the specified VLAN to 24576 if this value will cause this switch to become the root for the specified VLAN.

When you enter the spanning-tree vlan vlan-id root secondary command, because of support for the extended system ID, the software alters this switch's switch priority from the default value (32768) to 28672. If the root switch should fail, this switch becomes the next root switch (if the other switches in the network use the default switch priority of 32768, and therefore, are unlikely to become the root switch).

Examples

This example shows how to disable STP on VLAN 5:

Switch(config)# no spanning-tree vlan 5

You can verify your setting by entering the show spanning-tree privileged EXEC command. In this instance, VLAN 5 does not appear in the list.

This example shows how to set the spanning-tree forwarding time to 18 seconds for VLAN 20:

Switch(config)# spanning-tree vlan 20 forward-time 18

This example shows how to set the spanning-tree hello-delay time to 3 seconds for VLAN 20:

Switch(config)# spanning-tree vlan 20 hello-time 3

This example shows how to set spanning-tree max-age to 30 seconds for VLAN 20:

Switch(config)# spanning-tree vlan 20 max-age 30

This example shows how to reset the max-age parameter to the default value for spanning-tree instance 100:

Switch(config)# no spanning-tree vlan 100 max-age

This example shows how to set the spanning-tree priority to 125 for VLAN 20:

Switch(config)# spanning-tree vlan 20 priority 125

This example shows how to configure the switch as the root switch for VLAN 10 with a network diameter of 4:

Switch(config)# spanning-tree vlan 10 root primary diameter 4

This example shows how to configure the switch as the secondary root switch for VLAN 10 with a network diameter of 4:

Switch(config)# spanning-tree vlan 10 root secondary diameter 4 

You can verify your settings by entering the show spanning-tree privileged EXEC command.

Related Commands

Command	Description
show spanning-tree	Displays spanning-tree information for the specified spanning-tree instances.
spanning-tree cost	Sets the path cost for STP calculations.
spanning-tree guard	Enables the root guard feature for all the VLANs associated with the selected interface.
spanning-tree port-priority	Sets an interface priority, which is used when two switches tie for the position of the root switch.
spanning-tree portfast	Enables the Port Fast feature on an interface in all its associated VLANs.
spanning-tree uplinkfast	Enables the UplinkFast feature, which accelerates the choice of a new root port.

speed

Use the speed interface configuration command to specify the speed of a 10/100 Mbps or 10/100/1000 Mbps port. Use the no or default form of this command to return the port to its default value.

speed {10 | 100 | 1000 | auto | nonegotiate}

no speed

---

Note You cannot configure speed or duplex mode on Gigabit Interface Converter (GBIC) ports, but for certain types of GBICs, you can configure speed to not negotiate (nonegotiate) if connected to a device that does not support autonegotiation.

---

Syntax Description

10	Port runs at 10 Mbps.
100	Port runs at 100 Mbps.
1000	Port runs at 1000 Mbps. This option is valid and visible only on Gigabit Ethernet (Tx) ports.
auto	Port automatically detects the speed it should run at based on the port at the other end of the link.
nonegotiate	Autonegotiation is disabled and the port runs at 1000 Mbps. This option is valid and visible only on 1000BASE-SX, -LX, and -ZX GBIC ports. Gigastack GBICs and 1000BASE-T GBICs do not support disabling of autonegotiation.

Defaults

The default is auto.

Command Modes

Interface configuration

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.
12.1(6)EA1	The 1000 and nonegotiate keywords were added.

Usage Guidelines

You can configure Fast Ethernet port speed to either 10 or 100 Mbps. You can configure Gigabit Ethernet port speed to 10, 100, or 1000 Mbps. You cannot configure speed on Gigabit Interface Converter (GBIC) interfaces, but for 1000BASE-SX, -LX, or -ZX GBICs, you can configure speed to not negotiate (nonegotiate) if connected to a device that does not support autonegotiation.

If the speed is set to auto, the switch negotiates with the device at the other end of the link for the speed setting and then forces the speed setting to the negotiated value. The duplex setting remains as configured on each end of the link, which could result in a duplex setting mismatch.

If both ends of the line support autonegotiation, we highly recommend the default autonegotiation settings. If one interface supports autonegotiation and the other end does not, configure duplex and speed on both interfaces; do use the auto setting on the supported side.

If both the speed and duplex are set to specific values, autonegotiation is disabled.

---

Caution Changing the interface speed and duplex mode configuration might shut down and re-enable the interface during the reconfiguration.

---

---

Note For guidelines on setting the switch speed and duplex parameters, refer to the Catalyst 3550 Multilayer Switch Software Configuration Guide for this release.

---

Examples

This example shows how to set the specified interface to 100 Mbps:

Switch(config)# interface gigabitethernet0/1

Switch(config-if)# speed 100

You can verify your settings by entering the show interfaces privileged EXEC command.

Related Commands

Command	Description
duplex	Specifies the duplex mode of operation for Fast Ethernet and Gigabit Ethernet ports.
show interfaces	Displays the statistical information specific to all interfaces or to a specific interface

standby mac-address

Use the standby mac-address interface configuration command to specify the virtual MAC address for the virtual router. Use the no form of this command to remove the assigned MAC address.

standby [group-number] mac-address macaddress

no standby [group-number] mac-address macaddress

This command is available only if the enhanced multilayer software image (EMI) is installed. All Catalyst 3550 Gigabit Ethernet switches ship with the EMI installed. Catalyst 3550 Fast Ethernet switches can be shipped with either the standard multilayer software image (SMI) or EMI pre-installed. You can order the Enhanced Multilayer Software Image Upgrade kit to upgrade Catalyst 3550 Fast Ethernet switches from the SMI to the EMI.

---

Note For best operation, we recommend that you do not configure a virtual MAC address on the switch interfaces, but use the default well-known virtual MAC address.

---

Syntax Description

group-number	(Optional) Group number on the interface for which the virtual MAC address is being set. The default is 0.
macaddress	The MAC address for the virtual router. For proper operation, the first five bytes of all MAC addresses used for Hot Standby Router Protocol (HSRP) should be the same. The last byte is the group number. When no MAC address is configured, the default well-known MAC address is used (recommended).

Defaults

The default group number is 0.

The default macaddress (recommended) is the well-known MAC address
0x00 0x00 0x0C 0x07 0xAC XX, where XX represents the group HSRP number.

Command Modes

Interface configuration

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

For best use of hardware, we recommend using the default well-known MAC address. If you do configure a virtual MAC address, the first five bytes of all MAC addresses used for HSRP should be the same. The last byte represents the HSRP group.

Related Commands

Command	Description
standby authentication	Configures an authentication string for the HSRP. For syntax information, select Cisco IOS IP and IP Routing Command Reference for Release 12.1 > IP Addressing and Services> IP Services Commands.
standby ip	Configures or activates the HSRP. For syntax information, select Cisco IOS IP and IP Routing Command Reference for Release 12.1 > IP Addressing and Services> IP Services Commands.
standby preempt	Configures HSRP priority, preemption, and preemption delay. For syntax information, select Cisco IOS IP and IP Routing Command Reference for Release 12.1 > IP Addressing and Services> IP Services Commands.
standby priority	Configures HSRP priority, preemption, and preemption delay. For syntax information, select Cisco IOS IP and IP Routing Command Reference for Release 12.1 > IP Addressing and Services> IP Services Commands.
standby timers	Configures the time between hellos and the time before other routers declare the active Hot Standby or standby router to be down. For syntax information, select Cisco IOS IP and IP Routing Command Reference for Release 12.1 > IP Addressing and Services> IP Services Commands.
standby track	Configures an interface so that the Hot Standby priority changes based on the availability of other interfaces. For syntax information, select Cisco IOS IP and IP Routing Command Reference for Release 12.1 > IP Addressing and Services> IP Services Commands.

storm-control

Use the storm-control interface configuration command to enable broadcast, multicast, or unicast storm control on an interface with the specified threshold level. Use the no form of this command to disable broadcast, multicast, or unicast storm control on an interface.

storm-control {broadcast | multicast | unicast} level level [.level]

no storm-control {broadcast | multicast | unicast} level

Syntax Description

broadcast	Enable broadcast storm control on the interface.
multicast	Enable multicast storm control on the interface.
unicast	Enable unicast storm control on the interface.
level	Storm-control suppression level as a percent of total bandwidth; valid values are from 0 to 100 percent.
.level	(Optional) Fractional storm-control suppression level; valid values are from 0 to 99.

Defaults

Broadcast, multicast, and unicast storm control are disabled.

Command Modes

Interface configuration

Command History

Release	Modification
12.1(8)EA1	This command was first introduced. It replaces the switchport broadcast, switchport multicast, and switchport unicast interface configuration commands.

Usage Guidelines

Storm control is supported only on physical interfaces; it is not supported on EtherChannel port channels, even though it is available in the CLI.

Storm-control suppression level is entered as a percentage of total bandwidth. A threshold value of 100 percent means that no limit is placed on the specified traffic type. A value of 0.0 means that all broadcast, multicast, or unicast traffic on that port is blocked.

If a multicast storm control suppression level is exceeded on a switch, all traffic (multicast, unicast, and broadcast) is blocked until the multicast traffic rate drops below the threshold. Only Spanning Tree Protocol (STP) packets are passed. If broadcast or unicast storm control suppression level is exceeded, only that type of traffic is blocked until the rate drops below the threshold.

---

Note For more information about storm control suppression levels, refer to the Catalyst 3550 Multilayer Switch Software Configuration Guide for this release.

---

Examples

This example shows how to enable multicast storm control with a 75.5 percent threshold level:

Switch(config-if)# storm-control multicast level 75.5

This example shows how to disable multicast storm control:

Switch(config-if)# no storm-control multicast level

You can verify your settings by entering the show storm-control privileged EXEC command.

Related Commands

Command	Description
show storm-control	Displays broadcast, multicast, or unicast storm control settings on all interfaces or on a specified interface.

switchcore

Use the switchcore global configuration command to reserve switch resources for high-priority traffic or to give buffer storage more priority than packet retrieval. Use the no form of this command to return to the default setting.

switchcore {resource-allocation priority | wirespeed-store}

no switchcore {resource-allocation priority | wirespeed-store}

Syntax Description

resource-allocation priority	Reserve switch resources for high-priority traffic. Lower-priority traffic is likely to be rejected during times of congestion.
wirespeed-store	Reserve bandwidth for buffer storage to accommodate broadcast and multicast storms.

Defaults

When quality of service (QoS) is disabled, both the resource-allocation priority and the wirespeed-store options are disabled.

When QoS is enabled, resource-allocation priority is enabled, and wirespeed store is disabled.

Use the resource-allocation priority keywords when you want to reserve some switch buffers for high-priority traffic. Use the wirespeed-store keywords when you want to allocate more switch bandwidth to frame storage than to frame retrieval; this is only needed when you expect lots of broadcast and multicast traffic on the switch, and you want frame retrieval to be the dominant operation.

Command Modes

Global configuration

Command History

Release	Modification
12.1(6)EA1	This command was first introduced.

Usage Guidelines

You must globally enable QoS by using the mls qos global configuration command before the switchcore global configuration command takes effect.

Examples

This example shows how to disable resource-allocation priority:

Switch(config)# no switchcore resource-allocation priority

This example shows how to enable QoS and enable the wirespeed-store:

Switch(config)# mls qos

Switch(config)# switchcore wirespeed-store

You can verify your settings by entering the show controllers switch {resource-allocation priority | wirespeed-store} privileged EXEC command.

Related Commands

Command	Description
show controllers switch resource-allocation priority show controllers switch wirespeed-store	Displays the setting of the resource-allocation priority feature or the wirespeed-store.

switchport

Use the switchport interface configuration command with no keywords to put an interface that is in Layer 3 mode into Layer 2 mode for Layer 2 configuration. Use the no switchport command to put an interface in Layer 3 mode.

switchport

no switchport

Use the no switchport command (without parameters) to set the interface to the routed-interface status and erase all Layer 2 configurations. You must use this command before assigning an IP address to a routed port.

The switchport command with no keywords is not used on platforms that do not have the enhanced multilayer software image (EMI) installed. All physical ports on such platforms that are assumed to be Layer 2 switched interfaces.

The no switchport command is available only if the EMI is installed. All Catalyst 3550 Gigabit Ethernet switches ship with the EMI installed. Catalyst 3550 Fast Ethernet switches can be shipped with either the standard multilayer software image (SMI) or EMI pre-installed. You can order the Enhanced Multilayer Software Image Upgrade kit to upgrade Catalyst 3550 Fast Ethernet switches from the SMI to the EMI.

---

Note If an interface is configured as a Layer 3 interface, you must first enter the switchport command without any keywords to configure the interface as a Layer 2 port before you can enter additional switchport commands with keywords.

---

Syntax Description

This command has no arguments or keywords.

Defaults

By default, all interfaces are in Layer 2 mode.

Command Modes

Interface configuration

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

Entering the no switchport command shuts the port down and then re-enables it, which might generate messages on the device to which the port is connected.

Examples

This example shows how to cause an interface to cease operating as a Layer 2 port and become a Cisco-routed port. The EMI must be installed on the switch to use this command.

Switch(config-if)# no switchport

This example shows how to cause the port interface to cease operating as a Cisco-routed port and convert to a Layer 2-switched interface:

Switch(config-if)# switchport

---

Note The switchport command without keywords is not used on platforms that do not support Cisco-routed ports. All physical ports on such platforms are assumed to be Layer 2-switched interfaces.

---

You can verify the switchport status of an interface by entering the show running-config privileged EXEC command.

Related Commands

Command	Description
show interfaces switchport	Displays the administrative and operational status of a switching (nonrouting) port, including port blocking and port protection settings.
show running-config	Displays the current operating configuration. For syntax information, select Cisco IOS Configuration Fundamentals Command Reference for Release 12.1 > Cisco IOS File Management Commands > Configuration File Commands.

switchport access

Use the switchport access interface configuration command to configure a port as a static-access or dynamic-access port. If the mode is set to access, the port operates as a member of the configured VLAN. If set to dynamic, the port starts discovery of VLAN assignment based on the incoming packets it receives. Use the no form of this command to reset the access mode to the default VLAN for the switch.

switchport access vlan {vlan-id | dynamic}

no switchport access vlan

Syntax Description

access vlan vlan-id

Configure the interface as a static access port; valid values are from 1 to 1005.

access vlan dynamic

Specify that the access mode VLAN is dependent on the VLAN Membership Policy Server (VMPS) protocol. The port is assigned to a VLAN based on the source MAC address of a host (or hosts) connected to the port. The switch sends every new MAC address received to the VMPS server to obtain the VLAN name to which the dynamic-access port should be assigned. If the port already has a VLAN assigned and the source has already been approved by the VMPS, the switch forwards the packet to the VLAN.

Defaults

The default access VLAN and trunk interface native VLAN is a default VLAN corresponding to the platform or interface hardware.

A dynamic-access port is initially a member of no VLAN and receives its assignment based on the packet it receives.

Command Modes

Interface configuration

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

The no switchport access command resets the access mode VLAN to the appropriate default VLAN for the device.

The port must be in access mode before the switchport access vlan command can take effect.

An access port can be assigned to only one VLAN.

The VMPS server (such as a Catalyst 6000 series switch) must be configured before a port is configured as dynamic.

These restrictions apply to dynamic-access ports:

•The software implements the VLAN Query Protocol (VQP) client, which can query a VMPS such as a Catalyst 6000 series switch. The Catalyst 3550 switches are not VMPS servers. The VMPS server must be configured before a port is configured as dynamic.

•Use dynamic-access ports only to connect end stations. Connecting them to switches or routers (that use bridging protocols) can cause a loss of connectivity.

•Configure the network so that STP does not put the dynamic-access port into an STP blocking state. The Port Fast feature is automatically enabled on dynamic-access ports.

•Dynamic-access ports can only be in one VLAN and do not use VLAN tagging.

•Dynamic-access ports cannot be configured as

–Members of an EtherChannel port group (dynamic-access ports cannot be grouped with any other port, including other dynamic ports).

–Source or destination ports in a static address entry.

–Monitor ports.

Examples

This example shows how to cause a port interface that has already been configured as a switched interface to operate in VLAN 2 instead of the platform's default VLAN when in access mode:

Switch(config-if)# switchport access vlan 2

You can verify your setting by entering the show interfaces interface-id switchport privileged EXEC command and examining information in the Administrative Mode and Operational Mode rows.

Related Commands

Command	Description
show interfaces switchport	Displays the administrative and operational status of a switching (nonrouting) port, including port blocking and port protection settings.
switchport mode	Configures the VLAN membership mode of a port.

switchport block

Use the switchport block interface configuration command to prevent unknown multicast or unicast packets from being forwarded. Use the no form of this command to allow forwarding unknown multicast or unicast packets.

switchport block {multicast | unicast}

no switchport block {multicast | unicast}

Syntax Description

multicast	Specify that unknown multicast traffic should be blocked.
unicast	Specify that unknown unicast traffic should be blocked.

Defaults

Unknown multicast and unicast traffic are not blocked.

Command Modes

Interface configuration

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

By default, all traffic with unknown MAC addresses is sent to all ports. You can block unknown multicast or unicast traffic on protected or non-protected ports. If unknown multicast or unicast traffic is not blocked on a protected port, there could be security issues.

Blocking unknown multicast or unicast traffic is not automatically enabled on protected ports; you must explicitly configure it.

---

Note For more information about blocking packets, refer to the Catalyst 3550 Multilayer Switch Software Configuration Guide for this release.

---

Examples

This example shows how to block unknown multicast traffic on an interface:

Switch(config-if)# switchport block multicast

You can verify your setting by entering the show interfaces interface-id switchport privileged EXEC command.

Related Commands

Command	Description
show interfaces switchport	Displays the administrative and operational status of a switching (nonrouting) port, including port blocking and port protection settings.

switchport broadcast

This is an obsolete command.

In past releases, the switchport broadcast interface configuration command was used to set the broadcast suppression level on the interface. This command is replaced by the storm-control broadcast interface configuration command.

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.
12.1(8)EA1	This command was replaced by the storm-control command.

Related Commands

Command	Description
storm-control	Sets broadcast, multicast, or unicast storm control on an interface with the specified threshold level.
show storm-control	Displays broadcast suppression settings on an interface or on all interfaces.
switchport multicast	Obsolete command. Replaced by the storm-control multicast interface configuration command.
switchport unicast	Obsolete command. Replaced by the storm-control unicast interface configuration command.

switchport mode

Use the switchport mode interface configuration command to configure the VLAN membership mode of a port. Use the no form of this command to reset the mode to the appropriate default for the device.

switchport mode {access | trunk | dynamic {auto | desirable}}

no switchport mode

Syntax Description

access	Set the port to access mode (either static-access or dynamic-access depending on the setting of the switchport access vlan interface configuration command). The port is set to access unconditionally and operates as a nontrunking, single VLAN interface that sends and receives nonencapsulated (non-tagged) frames. An access port can be assigned to only one VLAN.
trunk	Set the port to trunk unconditionally. The port is a trunking VLAN Layer-2 interface. The port sends and receives encapsulated (tagged) frames that identify the VLAN of origination. A trunk is a point-to-point link between two switches or between a switch and a router.
dynamic auto	Set the interface trunking mode dynamic parameter to auto to specify that the interface convert the link to a trunk link.
dynamic desirable	Set the interface trunking mode dynamic parameter to desirable to specify that the interface actively attempt to convert the link to a trunk link.

Defaults

The default mode is dynamic desirable.

Command Modes

Interface configuration

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

Configuration using the access or trunk keywords takes effect only when the port is changed to the corresponding mode by using the switchport mode command. The static-access and trunk configuration are saved, but only one configuration is active at a time.

If you enter access mode, the interface changes into permanent nontrunking mode and negotiates to convert the link into a nontrunk link even if the neighboring interface does not agree to the change.

If you enter trunk mode, the interface changes into permanent trunking mode and negotiates to convert the link into a trunk link even if the interface connecting to it does not agree to the change.

If you enter dynamic auto mode, the interface converts the link to a trunk link if the neighboring interface is set to trunk or desirable mode.

If you enter dynamic desirable mode, the interface becomes a trunk interface if the neighboring interface is set to trunk, desirable, or auto mode.

If you try to enable 802.1X on a trunk port, an error message appears, and 802.1X is not enabled. If you try to change the mode of an 802.1X-enabled port to trunk, the port mode is not changed.

If you try to enable 802.1X on a dynamic port, an error message appears, and 802.1X is not enabled. If you try to change the mode of an 802.1X-enabled port to dynamic, the port mode is not changed.

If you try to enable 802.1X on a dynamic-access (VLAN Query Protocol [VQP]) port, an error message appears, and 802.1X is not enabled. If you try to change an 802.1X-enabled port to dynamic VLAN assignment, an error message appears, and the VLAN configuration is not changed.

Examples

This example shows how to configure a port for access mode:

Switch(config-if)# switchport mode access

This example shows how set the interface to dynamic desirable mode:

Switch(config-if)# switchport mode dynamic desirable

This example shows how to configure a port for trunk mode:

Switch(config-if)# switchport mode trunk

You can verify your settings by entering the show interfaces interface-id switchport privileged EXEC command and examining information in the Administrative Mode and Operational Mode rows.

Related Commands

Command	Description
show interfaces switchport	Displays the administrative and operational status of a switching (nonrouting) port, including port blocking and port protection settings.
switchport access	Configures a port as a static-access or dynamic-access port.

switchport multicast

This is an obsolete command.

In past releases, the switchport multicast interface configuration command was used to set the multicast suppression level on the interface. This command is replaced by the storm-control multicast interface configuration command.

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.
12.1(8)EA1	This command was replaced by the storm-control command.

Related Commands

Command	Description
storm-control	Sets broadcast, multicast, or unicast storm control on an interface with the specified threshold level.
show storm-control multicast	Displays multicast suppression settings on an interface or on all interfaces.
switchport broadcast	Obsolete command. Replaced by the storm-control broadcast interface configuration command.
switchport unicast	Obsolete command. Replaced by the storm-control unicast interface configuration command.

switchport nonegotiate

Use the switchport nonegotiate interface configuration command to specify that Dynamic Trunking Protocol (DTP) negotiation packets are not sent on the Layer 2 interface. The switch does not engage in negotiation protocol on this interface. Use the no form of this command to return to the default setting.

switchport nonegotiate

no switchport nonegotiate

Syntax Description

This command has no arguments or keywords.

Defaults

The default mode is to use DTP negotiation to determine trunking status.

Command Modes

Interface configuration

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

The no form of the switchport nonegotiate command removes nonegotiate status.

When using the nonegotiate keyword, DTP negotiation packets are not sent on the interface. The device does or does not trunk according to the mode parameter given: access or trunk. This command returns an error if you attempt to execute it in dynamic (auto or desirable) mode.

Examples

This example shows how to cause a port interface to refrain from negotiating trunking mode and act as a trunk or access port (depending on the mode set):

Switch(config-if)# switchport nonegotiate

You can verify your setting by entering the show interfaces interface-id switchport privileged EXEC command.

Related Commands

Command	Description
show interfaces switchport	Displays the administrative and operational status of a switching (nonrouting) port, including port blocking and port protection settings.
switchport mode	Configures the VLAN membership mode of a port.

switchport port-security

Use the switchport port-security interface configuration command without keywords to enable port security on the interface. Use the keywords to configure secure MAC addresses, a maximum number of secure MAC addresses, or the violation mode. Use the no form of this command to disable port security or to set the parameters to their default states.

switchport port-security [mac-address mac address] | [maximum value] | [violation {protect | restrict | shutdown}]

no switchport port-security [mac-address mac address] | [maximum value] | [violation {protect | restrict | shutdown}]

Syntax Description

mac-address mac-address	(Optional) Specify a secure MAC address for the interface by entering a 48-bit MAC address. You can add additional secure MAC addresses up to the maximum value configured.
maximum value	(Optional) Set the maximum number of secure MAC addresses for the interface. The range is from 1 to 128. The default setting is 128.
violation	(Optional) Set the security violation mode or the action to be taken if port security is violated. The default is shutdown.
protect	(Optional) Set security violation protect mode. When the number of secure MAC addresses reach the maximum limit allowed on the port, packets with unknown source addresses are dropped until you remove a sufficient number of secure MAC addresses to drop below the maximum value.
restrict	(Optional) Set security restrict mode. In this mode, a port security violation does not restrict data but causes a trap notification to be sent to the network management station.
shutdown	(Optional) Set security violation shutdown mode. In this mode, a port security violation causes a the interface to shut down immediately and an SNMP trap notification to be sent. Once shut down, the interface must be manually re-enabled by using the no shutdown interface configuration command. This is the default mode.

Defaults

The default is to disable port security. When port security is enabled, if no keywords are entered, the default maximum number of secure MAC addresses is 128. The default violation mode is shutdown.

Command Modes

Interface configuration

Command History

Release	Modification
12.1(8)EA1	This command was first introduced.

Usage Guidelines

After you have set the maximum number of secure MAC addresses allowed on a port, you can add secure addresses to the address table by manually configuring them, by allowing the port to dynamically configure them, or by configuring some MAC addresses and allowing the rest to be dynamically configured.

A security violation occurs when the maximum number of secure MAC addresses have been added to the address table and a station whose MAC address is not in the address table attempts to access the interface, or when a station whose MAC address is configured as a secure MAC address on another secure port attempts to access the interface.

A secure port has the following limitations:

•A secure port cannot be a dynamic access port or a trunk port.

•A secure port cannot be a routed port.

•A secure port cannot be a protected port.

•A secure port cannot be a destination port for Switch Port Analyzer (SPAN).

•A secure port cannot belong to a Fast EtherChannel or Gigabit EtherChannel port group.

•A secure port cannot be an 802.1X port. If you try to enable 802.1X on a secure port, an error message appears, and 802.1X is not enabled. If you try to change an 802.1X-enabled port to a secure port, an error message appears, and the security settings are not changed.

Examples

This example shows how to enable port security on Fast Ethernet port 12 and to set the maximum number of secure addresses to 5. The violation mode is the default, and no secure MAC addresses are configured.

Switch(config)# interface fastethernet 0/12

Switch(config-if)# switchport mode access

Switch(config-if)# switchport port-security

Switch(config-if)# switchport port-security maximum 5

You can verify the settings for all secure ports or the specified port by using the show port-security privileged EXEC command.

This example shows how to configure a secure MAC address on Fast Ethernet port 12.

Switch(config)# interface fastethernet 0/12

Switch(config-if)# switchport mode access

Switch(config-if)# switchport port-security

Switch(config-if)# switchport port-security mac-address 1000.2000.3000

You can verify your settings by using the show port-security address privileged EXEC command.

Related Commands

Command	Description
show port-security interface interface-id	Displays port security configuration for the switch or for the specified interface.
show port-security address	Displays all the secure addresses configured on the switch.

switchport protected

Use the switchport protected interface configuration command to isolate unicast, multicast, and broadcast traffic at Layer 2 from other protected ports on the same switch. Use the no form of the command to disable protection on the port.

switchport protected

no switchport protected

Syntax Description

This command has no arguments or keywords.

Defaults

No protected port is defined. All ports are nonprotected.

Command Modes

Interface configuration

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

The switchport protection feature is local to the switch; communication between protected ports on the same switch is possible only through a Layer 3 device. To prevent communication between protected ports on different switches, you must configure the protected ports for unique VLANs on each switch and configure a trunk link between the switches. A protected port is different from a secure port.

A protected port does not forward any unicast, multicast, or broadcast traffic to any other protected port. A protected port continues to forward unicast, multicast, and broadcast traffic to unprotected ports and vice versa.

Port monitoring does not work if both the monitor and monitored ports are protected ports.

Examples

This example shows how to enable a protected port on an interface:

Switch(config)# interface gigabitethernet0/3

Switch(config-if)# switchport protected

You can verify your settings by entering the show interfaces interface-id switchport privileged EXEC command.

Related Commands

Command	Description
show interfaces switchport	Displays the administrative and operational status of a switching (nonrouting) port, including port blocking and port protection settings.
switchport block	Prevents unknown multicast or unicast traffic on the interface.

switchport trunk

Use the switchport trunk interface configuration command to set the trunk characteristics when the interface is in trunking mode. Use the no form of this command to reset a trunking characteristic to the default.

switchport trunk {encapsulation {isl | dot1q | negotiate}} | {native vlan vlan-id} |
{allowed vlan vlan-list} | {pruning vlan vlan-list}

no switchport trunk {encapsulation {isl | dot1q | negotiate}} | {native vlan vlan-id} |
{allowed vlan vlan-list} | {pruning vlan vlan-list}

Syntax Description

encapsulation isl	Set the encapsulation format on the trunk port to Inter-Switch Link (ISL). The switch encapsulates all received and transmitted packets with an ISL header and filters native frames received from an ISL trunk port.
encapsulation dot1q	Set the encapsulation format on the trunk port to 802.1Q. With this format, the switch supports simultaneous tagged and untagged traffic on a port.
encapsulation negotiate	Specify that if Dynamic Inter-Switch Link (DISL) and Dynamic Trunking Protocol (DTP) negotiation do not resolve the encapsulation format, ISL is the selected format.
native vlan vlan-id	Set the native VLAN for sending and receiving untagged traffic when the interface is in 802.1Q trunking mode.Valid IDs are from 1 to 1001. Do not enter leading zeros.
allowed vlan vlan-list	Set the list of allowed VLANs that can received and send traffic on this interface in tagged format when in trunking mode. See the vlan-list format below. The default is all.
pruning vlan vlan-list	Set the list of VLANs that are enabled for VTP pruning when in trunking mode.

The vlan-list format is all | none | [add | remove | except] vlan-atom [,vlan-atom...] where:

•all specifies all VLANs from 1 to 1005. This keyword is not allowed on commands that do not permit all VLANs in the list to be set at the same time.

•none means an empty list. This keyword is not allowed on commands that require certain VLANs to be set or at least one VLAN to be set.

•add adds the defined list of VLANs to those currently set instead of replacing the list. Valid IDs are from 2 to 1001. Separate nonconsecutive VLAN IDs with a comma; use a hyphen to designate a range of IDs. Do not enter leading zeros.

•remove removes the defined list of VLANs from those currently set instead of replacing the list. Valid IDs are from 2 to 1001. Separate nonconsecutive VLAN IDs with a comma; use a hyphen to designate a range of IDs. Do not enter leading zeros. You cannot remove VLAN 1 or 1002 to 1005 from the list.

•except lists the VLANs that should be calculated by inverting the defined list of VLANs. (VLANs are added except the ones specified.) Valid IDs are from 2 to 1001. Separate nonconsecutive VLAN IDs with a comma; use a hyphen to designate a range of IDs. Do not enter leading zeros.

•vlan-atom is either a single VLAN number from 1 to 1005 or a continuous range of VLANs described by two VLAN numbers, the lesser one first, separated by a hyphen.

Defaults

The default encapsulation is negotiate.

VLAN 1 is the default native VLAN ID on the port.

The default for all VLAN lists is to include all VLANs.

Command Modes

Interface configuration

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

Encapsulation:

•The switchport trunk encapsulation command is supported only for platforms and interface hardware that can support both ISL and 802.1Q formats.

•You cannot configure one end of the trunk as an 802.1Q trunk and the other end as an ISL or nontrunk port. However, you can configure one port as an ISL trunk and another port on the same switch as an 802.1Q trunk.

•If you enter the negotiate keywords and DTP negotiation does not resolve the encapsulation format, ISL is the selected format. The no form of the command resets the trunk encapsulation format to the default.

•The no form of the encapsulation command resets the encapsulation format to the default.

Native VLANs:

•All untagged traffic received on an 802.1Q trunk port is forwarded with the native VLAN configured for the port.

•If a packet has a VLAN ID that is the same as the sending port native VLAN ID, the packet is sent untagged; otherwise, the switch sends the packet with a tag.

•The no form of the native vlan command resets the native mode VLAN to the appropriate default VLAN for the device.

Allowed VLAN:

•The no form of the allowed vlan command resets the list to the default list, which allows all VLANs.

Trunk Pruning:

•The pruning-eligible list applies only to trunk ports.

•Each trunk port has its own eligibility list.

•If you do not want a VLAN to be pruned, remove it from the pruning-eligible list. VLANs that are pruning-ineligible receive flooded traffic.

Examples

This example shows how to cause a port interface configured as a switched interface to encapsulate in 802.1Q trunking format regardless of its default trunking format in trunking mode:

Switch(config-if)# switchport trunk encapsulation dot1q

This example shows how to configure VLAN 3 as the default port to send all untagged traffic:

Switch(config-if)# switchport trunk native vlan 3

This example shows how to add VLANs 1, 2, 5, and 6 to the allowed list:

Switch(config-if)# switchport trunk allowed vlan add 1,2,5,6

This example shows how to remove VLANs 3 and 10 to 15 from the pruning-eligible list:

Switch(config-if)# switchport trunk pruning vlan remove 3,10-15

You can verify your settings by entering the show interfaces interface-id switchport privileged EXEC command.

Related Commands

Command	Description
show interfaces switchport	Displays the administrative and operational status of a switching (nonrouting) port, including port blocking and port protection settings.
switchport mode	Configures the VLAN membership mode of a port.

switchport unicast

This is an obsolete command.

In past releases, the switchport unicast interface configuration command was used to set the multicast suppression level on the interface. This command is replaced by the storm-control unicast interface configuration command.

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.
12.1(8)EA1	This command was replaced by the storm-control command.

Related Commands

Command	Description
storm-control	Sets broadcast, multicast, or unicast storm control on an interface with the specified threshold level.
show storm-control unicast	Displays unicast suppression settings on an interface or on all interfaces.
switchport broadcast	Obsolete command. Replaced by the storm-control broadcast interface configuration command.
switchport multicast	Obsolete command. Replaced by the storm-control multicast interface configuration command.

system mtu

Use the system mtu global configuration command to set the maximum packet size or maximum transmission unit (MTU) size for the switch. Use the no form of this command to restore the global MTU value to its original default value.

system mtu bytes

no system mtu

Syntax Description

bytes

Packet size in bytes. The range is from 1500 to 2025 bytes for Gigabit Ethernet switches and from 1500 to 1546 bytes for Fast Ethernet switches.

Defaults

The default MTU size is 1500 bytes.

Command Modes

Global configuration

Command History

Release	Modification
12.1(4)EA1	This command was first introduced.

Usage Guidelines

When you use this command to change the MTU size, you must reset the switch before the new configuration takes affect.

If you enter a value that is outside of the range for the specific type of switch, the value is not accepted.

---

Note The switch does not support setting the MTU on a per-interface basis.

---

The size of frames that can be received by the switch CPU is limited to 1500 bytes, no matter what value was entered with the system mtu command. Although frames that are forwarded or routed typically are not received by the CPU, in some cases packets are sent to the CPU, such as traffic sent to control traffic, SNMP, Telnet, or routing protocols.

Examples

This example shows how to set the maximum packet size for a Gigabit Ethernet switch to 2000 bytes:

Switch(config)# system mtu 2000

Switch(config)# exit

Switch# reload

This example shows the response when you try to set a Fast Ethernet switch to an out-of-range number:

Switch(config)# system mtu 2000

                                ^

% Invalid input detected at '^' marker.

You can verify your settings by entering the show system mtu privileged EXEC command.

Related Commands

Command	Description
show system mtu	Displays the maximum packet size set for the switch.