Catalyst 3550 Multilayer Switch Command Reference, 12.1(19)EA1
Cisco IOS Commands - a through r
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Cisco IOS Commands

Table Of Contents

Cisco IOS Commands

aaa authentication dot1x

access-list hardware program nonblocking

action

archive download-sw

archive tar

archive upload-sw

auto qos voip

boot boothlpr

boot buffersize

boot config-file

boot enable-break

boot helper

boot helper-config-file

boot manual

boot private-config-file

boot system

channel-group

channel-protocol

class

class-map

clear lacp

clear l2protocol-tunnel counters

clear mac address-table

clear pagp

clear port-security

clear setup express

clear spanning-tree counters

clear spanning-tree detected-protocols

clear vmps statistics

clear vtp counters

cluster commander-address

cluster discovery hop-count

cluster enable

cluster holdtime

cluster member

cluster outside-interface

cluster run

cluster standby-group

cluster timer

define interface-range

delete

deny

dot1x default

dot1x guest-vlan

dot1x host-mode

dot1x initialize

dot1x max-req

dot1x multiple-hosts

dot1x port-control

dot1x re-authenticate

dot1x re-authentication

dot1x reauthentication

dot1x system-auth-control

dot1x timeout

duplex

errdisable detect cause

errdisable recovery

flowcontrol

interface port-channel

interface range

interface vlan

ip access-group

ip address

ip dhcp snooping

ip dhcp snooping information option

ip dhcp snooping information option format snmp-ifindex

ip dhcp snooping limit rate

ip dhcp snooping trust

ip dhcp snooping vlan

ip igmp filter

ip igmp max-groups

ip igmp profile

ip igmp snooping

ip igmp snooping report-suppression

ip igmp snooping source-only-learning age-timer

ip ssh

ip vrf (global configuration)

ip vrf (interface configuration)

l2protocol-tunnel

l2protocol-tunnel cos

lacp port-priority

lacp system-priority

logging file

mac access-group

mac access-list extended

mac address-table aging-time

mac address-table notification

mac address-table static

mac address-table static drop

macro apply

macro description

macro name

match (access-map configuration)

match (class-map configuration)

mls aclmerge delay

mls qos

mls qos aggregate-policer

mls qos cos

mls qos cos policy-map

mls qos dscp-mutation

mls qos map

mls qos min-reserve

mls qos monitor

mls qos trust

monitor session

mvr (global configuration)

mvr (interface configuration)

pagp learn-method

pagp port-priority

permit

police

police aggregate

policy-map

port-channel load-balance

power inline

priority-queue

rcommand

remote-span

rmon collection stats


Cisco IOS Commands


aaa authentication dot1x

Use the aaa authentication dot1x global configuration command to specify one or more authentication, authorization, and accounting (AAA) methods for use on interfaces running IEEE 802.1X. Use the no form of this command to disable authentication.

aaa authentication dot1x {default} method1 [method2...]

no aaa authentication dot1x {default}

Syntax Description

default

Use the listed authentication methods that follow this argument as the default list of methods when a user logs in.

method1 [method2...]

At least one of the these keywords:

enable—Use the enable password for authentication.

group radius—Use the list of all Remote Authentication Dial-In User Service (RADIUS) servers for authentication.

line—Use the line password for authentication.

local—Use the local username database for authentication.

local-case—Use the case-sensitive local username database for authentication.

none—Use no authentication. The client is automatically authenticated by the switch without using the information supplied by the client.


Defaults

No authentication is performed.

Command Modes

Global configuration

Command History

Release
Modification

12.1(8)EA1

This command was first introduced.


Usage Guidelines

The method argument identifies the list of methods that the authentication algorithm tries in the given sequence to validate the password provided by the client. The only method that is truly 802.1X-compliant is the group radius method, in which the client data is validated against a RADIUS authentication server. The remaining methods enable AAA to authenticate the client by using locally configured data. For example, the local and local-case methods use the username and password that are saved in the Cisco IOS configuration file. The enable and line methods use the enable and line passwords for authentication.

If you specify group radius, you must configure the RADIUS server by entering the radius-server host global configuration command.

If you are not using a RADIUS server, you can use the local or local-case methods, which access the local username database to perform authentication. By specifying the enable or line methods, you can supply the clients with a password to provide access to the switch.

Use the show running-config privileged EXEC command to display the configured lists of authentication methods.

Examples

This example shows how to enable AAA and how to create an authentication list for 802.1X. This authentication first tries to contact a RADIUS server. If this action returns an error, the user is allowed access with no authentication.

Switch(config)# aaa new-model
Switch(config)# aaa authentication dot1x default group radius none

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

Related Commands

Command
Description

aaa new-model

Enables the AAA access control model. For syntax information, refer to the Cisco IOS Security Command Reference for Release 12.1 > Authentication, Authorization, and Accounting > Authentication Commands.

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
.


access-list hardware program nonblocking

Use the access-list hardware program nonblocking global configuration command to cause the system to continue to forward frames even while a new security access-control list (ACL) configuration is being programmed into the hardware. Use the no form of this command to return to the default behavior, where traffic is blocked on affected interfaces when changes are made to the security ACL configuration while the hardware is updated with the new configuration.

access-list hardware program nonblocking

no access-list hardware program nonblocking

Syntax Description

This command has no arguments or keywords.

Defaults

Traffic is blocked on affected interfaces while a new ACL configuration is loaded into hardware.

Command Modes

Global configuration

Command History

Release
Modification

12.1(11)EA1

This command was first introduced.


Usage Guidelines

By default, when changes are made to the configuration of security ACLs, the system completely blocks traffic on the affected ports or VLANs while it is updating the hardware to the new configuration. This includes any changes that affect the ternary content addressable memory (TCAM), including applying an ACL to an interface or making changes to VLAN maps or ACLs that are used for security features. This prevents the possibility of forwarding frames that should have been dropped because a partially loaded configuration permitted a frame that the complete configuration would have blocked.

You can use the access-list hardware program nonblocking command to set the system to continue to forward frames while a new security ACL configuration is being programmed into the hardware. Enabling this setting might cause less disruption to traffic that should be allowed while the hardware is being updated, but might also temporarily allow some traffic that would be denied when the new configuration is completely loaded.

Examples

This example shows how to set the system to continue forwarding frames while a new security ACL configuration is being programmed into hardware:

Switch (config)# access-list hardware program nonblocking

You can verify your setting by entering the show running-config | include access-list hardware privileged EXEC command.

Related Commands

Command
Description

access-list {deny | permit}

Configures a standard numbered ACL. For syntax information, select Cisco IOS IP and IP Routing Command Reference for IOS
Release 12.1 > IP Addressing and Services > IP Services Commands
.

action (access map configuration)

Defines or modifies the action for the VLAN access map entry.

ip access-group

Applies an IP access list to a Layer 2 or Layer 3 interface.

ip access-list

Configures a named access list. 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-group

Applies a MAC access list to a Layer 2 interface.

match (access-map configuration)

Defines the match conditions for a VLAN map.

show running-config | include access-list hardware

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.

vlan access-map

Creates a VLAN access map or enters access-map configuration mode.

vlan filter

Applies a VLAN map to one or more VLANs.


action

Use the action access map configuration command to set the action for the VLAN access map entry. Use the no form of this command to set the action to the default value, which is to forward.

action {drop | forward}

no action

Syntax Description

drop

Drop the packet when the specified conditions are matched.

forward

Forward the packet when the specified conditions are matched.


Defaults

The default action is to forward packets.

Command Modes

Access-map configuration

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.


Usage Guidelines

You enter access-map configuration mode by using the vlan access-map global configuration command.

If the action is drop, you should define the access map, including configuring any access control list (ACL) names in match clauses, before applying the map to a VLAN, or all packets could be dropped.

In access map configuration mode, use the match access map configuration command to define the match conditions for a VLAN map. Use the action command to set the action that occurs when a packet matches the conditions.

The drop and forward parameters are not used in the no form of the command.

Examples

This example shows how to identify and apply a VLAN access map vmap4 to VLANs 5 and 6 that causes the VLAN to forward an IP packet if the packet matches the conditions defined in access list al2:

Switch(config)# vlan access-map vmap4
Switch(config-access-map)# match ip address al2
Switch(config-access-map)# action forward
Switch(config-access-map)# exit
Switch(config)# vlan filter vmap4 vlan-list 5-6

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

Related Commands

Command
Description

access-list {deny | permit}

Configures a standard numbered ACL. 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

Creates a named access list. 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

Creates a named MAC address access list.

match (access-map configuration)

Defines the match conditions for a VLAN map.

show vlan access-map

Displays the VLAN access maps created on the switch.

vlan access-map

Creates a VLAN access map.


archive download-sw

Use the archive download-sw privileged EXEC command to download a new image to the switch and overwrite or keep the existing image.

archive download-sw {/force-reload | /imageonly | /leave-old-sw | /no-set-boot | /overwrite | /reload | /safe} source-url

Syntax Description

/force-reload

Unconditionally force a system reload after successfully downloading the software image.

/imageonly

Download only the software image but not the HTML files associated with the Cluster Management Suite (CMS). The HTML files for the existing version are deleted only if the existing version is being overwritten or removed.

/leave-old-sw

Keep the old software version after a successful download.

/no-set-boot

Do not alter the setting of the BOOT environment variable to point to the new software image after it is successfully downloaded.

/overwrite

Overwrite the software image in Flash with the downloaded one.

/reload

Reload the system after successfully downloading the image unless the configuration has been changed and not been saved.

/safe

Keep the current software image; do not delete it to make room for the new software image before the new image is downloaded. The current image is deleted after the download.

source-url

The source URL alias for a local or network file system. These options are supported:

The syntax for the local Flash file system:
flash:

The syntax for the File Transfer Protocol (FTP): ftp:[[//username[:password]@location]/directory]/image-name.tar

The syntax for the Remote Copy Protocol (RCP): rcp:[[//username@location]/directory]/image-name.tar

The syntax for the Trivial File Transfer Protocol (TFTP): tftp:[[//location]/directory]/image-name.tar

The image-name.tar is the software image to download and install on the switch.


Defaults

The current software image is not overwritten with the downloaded image.

Both the software image and HTML files are downloaded.

The new image is downloaded to the flash: file system.

The BOOT environment variable is changed to point to the new software image on the flash: file system.

Image names are case sensitive; the image file is provided in tar format.

Command Modes

Privileged EXEC

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.


Usage Guidelines

Use the /overwrite option to overwrite the image on the Flash device with the downloaded one.

If the Flash device has sufficient space to hold two images and you want to overwrite one of these images with the same version, you must specify the /overwrite option.

If you specify the command without the /overwrite option, the download algorithm verifies that the new image is not the same as the one on the switch flash device. If the images are the same, the download does not occur. If the images are different, the old image is deleted, and the new one is downloaded.

The /imageonly option removes the HTML files for the existing image if the existing image is being removed or replaced. Only the Cisco IOS image (without the HTML files) is downloaded.

Using the /safe or /leave-old-sw option can cause the new image download to fail if there is insufficient Flash space.

If you used the /leave-old-sw option and did not overwrite the old image when you downloaded the new one, you can remove the old image by using the delete privileged EXEC command. For more information, see the "delete" section.

If you leave the existing software in place before downloading the new image, an error results if the existing software will prevent the new image from fitting onto Flash memory.

After downloading a new image, enter the reload privileged EXEC command to begin using the new image, or specify the /reload or /force-reload option in the archive download-sw command.

Examples

This example shows how to download a new image from a TFTP server at 172.20.129.10 and overwrite the image on the switch:

Switch# archive download-sw /overwrite tftp://172.20.129.10/test-image.tar 

This example shows how to download only the software image from a TFTP server at 172.20.129.10 to the switch:

Switch# archive download-sw /image-only tftp://172.20.129.10/test-image.tar 

This example shows how to keep the old software version after a successful download:

Switch# archive download-sw /leave-old-sw tftp://172.20.129.10/test-image.tar 

Related Commands

Command
Description

archive tar

Creates a tar file, lists the files in a tar file, or extracts the files from a tar file.

archive upload-sw

Uploads an existing image on the switch to a server.

delete

Deletes a file or directory on the Flash memory device.


archive tar

Use the archive tar privileged EXEC command to create a tar file, list files in a tar file, or extract the files from a tar file.

archive tar {/create destination-url flash:/file-url} | {/table source-url} | {/xtract source-url flash:/file-url [dir/file...]}

Syntax Description

/create destination-url flash:/file-url

Create a new tar file on the local or network file system.

For destination-url, specify the destination URL alias for the local or network file system and the name of the tar file to create. These options are supported:

The syntax for the local Flash filesystem:
flash:

The syntax for the File Transfer Protocol (FTP): ftp:[[//username[:password]@location]/directory]/tar-filename.tar

The syntax for the Remote Copy Protocol (RCP) is: rcp:[[//username@location]/directory]/tar-filename.tar

The syntax for the Trivial File Transfer Protocol (TFTP): tftp:[[//location]/directory]/tar-filename.tar

The tar-filename.tar is the tar file to be created.

For flash:/file-url, specify the location on the local Flash file system from which the new tar file is created.

An optional list of files or directories within the source directory can be specified to write to the new tar file. If none are specified, all files and directories at this level are written to the newly created tar file.

/table source-url

Display the contents of an existing tar file to the screen.

For source-url, specify the source URL alias for the local or network file system. These options are supported:

The syntax for the local Flash file system:
flash:

The syntax for the File Transfer Protocol (FTP) ftp:[[//username[:password]@location]/directory]/tar-filename.tar

The syntax for the Remote Copy Protocol (RCP): rcp:[[//username@location]/directory]/tar-filename.tar

The syntax for the Trivial File Transfer Protocol (TFTP): tftp:[[//location]/directory]/tar-filename.tar

The tar-filename.tar is the tar file to display.

/xtract source-url flash:/file-url [dir/file...]

Extract files from a tar file to the local file system.

For source-url, specify the source URL alias for the local or network file system. These options are supported:

The syntax for the local Flash file system:
flash:

The syntax for the File Transfer Protocol (FTP): ftp:[[//username[:password]@location]/directory]/tar-filename.tar

The syntax for the Remote Copy Protocol (RCP): rcp:[[//username@location]/directory]/tar-filename.tar

The syntax for the Trivial File Transfer Protocol (TFTP): tftp:[[//location]/directory]/tar-filename.tar

The tar-filename.tar is the tar file from which to extract.

For flash:/file-url, specify the location on the local Flash file system into which the tar file is extracted.

For flash:/file-url [dir/file...], specify the location on the local Flash file system into which the tar file is extracted. Use the dir/file... option to specify an optional list of files or directories within the tar file to be extracted. If none are specified, all files and directories are extracted.


Defaults

None

Command Modes

Privileged EXEC

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.


Usage Guidelines

Filenames and directory names are case sensitive.

Image names are case sensitive.

Examples

This example shows how to create a tar file. The command writes the contents of the new-configs directory on the local Flash device to a file named saved.tar on the TFTP server at 172.20.10.30:

Switch# archive tar /create tftp:172.20.10.30/saved.tar flash:/new-configs

This example shows how to display the contents of the c3550-tv0-m.tar file that is in Flash memory. The contents of the tar file appear on the screen:

Switch# archive tar /table flash:c3550-tv0-m.tar
info (219 bytes)
c3550-tv0-mz-121/ (directory)
c3550-tv0-mz-121/html/ (directory)
c3550-tv0-mz-121/html/foo.html (0 bytes)
c3550-tv0-mz-121/vegas-tv0-mz-121.bin (610856 bytes)
c3550-tv0-mz-121/info (219 bytes)
info.ver (219 bytes)

This example shows how to display only the c3550-tv0-mz-121/html directory and its contents:

Switch# archive tar /table flash:c3550-tv0-m.tar c3550-tv0-mz-121/html
c3550-tv0-mz-121/html/ (directory)
c3550-tv0-mz-121/html/foo.html (0 bytes)

This example shows how to extract the contents of a tar file on the TFTP server at 172.20.10.30. This command extracts just the new-configs directory into the root directory on the local Flash file system. The remaining files in the saved.tar file are ignored.

Switch# archive tar /xtract tftp:/172.20.10.30/saved.tar flash:/ new-configs

Related Commands

Command
Description

archive download-sw

Downloads a new image to the switch.

archive upload-sw

Uploads an existing image on the switch to a server.


archive upload-sw

Use the archive upload-sw privileged EXEC command to upload an existing switch image to a server.

archive upload-sw [/version version_string] destination-url

Syntax Description

/version version_string

(Optional) Specify the specify version string of the image to be uploaded.

destination-url

The destination URL alias for a local or network file system. These options are supported:

The syntax for the local Flash file system:
flash:

The syntax for the File Transfer Protocol (FTP): ftp:[[//username[:password]@location]/directory]/image-name.tar

The syntax for the Remote Copy Protocol (RCP): rcp:[[//username@location]/directory]/image-name.tar

The syntax for the Trivial File Transfer Protocol (TFTP): tftp:[[//location]/directory]/image-name.tar

The image-name.tar is the name of software image to be stored on the server.


Defaults

Uploads the currently running image from the flash: file system.

Command Modes

Privileged EXEC

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.


Usage Guidelines

The upload feature is available only if the HTML files associated with the Cluster Management Suite (CMS) have been installed with the existing image.

The files are uploaded in this sequence: info, the Cisco IOS image, the HTML files, and info.ver. After these files are uploaded, the software creates the tar file.

Image names are case sensitive.

Examples

This example shows how to upload the currently running image to a TFTP server at 172.20.140.2:

Switch# archive upload-sw tftp://172.20.140.2/test-image.tar 

Related Commands

Command
Description

archive download-sw

Downloads a new image to the switch.

archive tar

Creates a tar file, lists the files in a tar file, or extracts the files from a tar file.


auto qos voip

Use the auto qos voip interface configuration command to automatically configure quality of service (auto-QoS) for voice over IP (VoIP) within a QoS domain. Use the no form of this command to change the auto-QoS configuration settings to the standard QoS defaults.

auto qos voip {cisco-phone | trust}

no auto qos voip

Syntax Description

cisco-phone

Identify this interface as connected to a Cisco IP phone, and automatically configure QoS for VoIP. The QoS labels of incoming packets are trusted only when the telephone is detected.

trust

Identify this interface as connected to a trusted switch or router, and automatically configure QoS for VoIP. The QoS labels of incoming packets are trusted.


Defaults

Auto-QoS is disabled on all interfaces.

When auto-QoS is enabled, it uses the ingress packet label to categorize traffic and class of service (CoS) packet labels and to configure the egress queues as summarized in Table 2-1.

Table 2-1 Traffic Types, Ingress Packet Labels, Assigned Packet Labels, and Egress Queues

 
VoIP Data Traffic Only From Cisco IP Phones
VoIP Control Traffic Only From Cisco IP Phones
Routing Protocol Traffic
STP 1 BPDU 2 Traffic
All Other Traffic

Ingress DSCP3

46

26

-

-

-

Ingress CoS

5

3

6

7

-

DiffServ

EF

AF31

-

-

-

Assigned DSCP

46

26

48

56

0

Assigned CoS

5

3

6

7

0

CoS-to-Queue Map

5

3, 6, 7

0, 1, 2, 4

Egress Queue

Expedite queue

80% WRR4

20% WRR

1 STP = Spanning Tree Protocol

2 BPDU = bridge protocol data unit

3 DSCP = Differentiated Services Code Point

4 WRR = weighted round robin


Table 2-2 lists the auto-QoS configuration for the egress queues.

Table 2-2 Auto-QoS Configuration for the Egress Queues

Egress Queue
Queue Number
CoS-to-Queue Map
Queue Weight
Queue Size for Gigabit-Capable Ports
Queue Size (in packets) for 10/100 Ethernet Ports

Expedite

4

5

-

-

26

80% WRR

3

3, 6, 7

80%

20%

65

20% WRR

1

0, 1, 2, 4

20%

80%

170


Command Modes

Interface configuration

Command History

Release
Modification

12.1(12c)EA1

This command was first introduced.


Usage Guidelines

Use this command to configure the QoS appropriate for VoIP traffic within the QoS domain. The QoS domain includes the switch, the interior of the network, and the edge devices that can classify incoming traffic for QoS.

Use the cisco-phone keyword on ports at the edge of the network that are connected to Cisco IP phones. The switch detects the telephone through the Cisco Discovery Protocol (CDP) and trusts the QoS labels in packets received from the telephone.

Use the trust keyword on ports connected to the interior of the network. Because it is assumed that traffic has already been classified by other edge devices, the QoS labels in these packets are trusted.

When you enable the auto-QoS feature on the first interface, these automatic actions occur:

QoS is globally enabled (mls qos global configuration command).

When you enter the auto qos voip cisco-phone interface configuration command, the trusted boundary feature is enabled. It uses the Cisco Discovery Protocol (CDP) to detect the presence or absence of a Cisco IP phone. When a Cisco IP phone is detected, the ingress classification on the interface is set to trust the QoS label received in the packet. When a Cisco IP phone is absent, the ingress classification is set to not trust the QoS label in the packet. The egress queues on the interface are also reconfigured (see Table 2-2).

When you enter the auto qos voip trust interface configuration command, the ingress classification on the interface is set to trust the QoS label received in the packet, and the egress queues on the interface are reconfigured (see Table 2-2).

You can enable auto-QoS on static, dynamic-access, voice VLAN access, and trunk ports.

To display the QoS configuration that is automatically generated when auto-QoS is enabled, enable debugging before you enable auto-QoS. Use the debug autoqos privileged EXEC command to enable auto-QoS debugging.

To disable auto-QoS on an interface, use the no auto qos voip interface configuration command. When you enter this command, the switch enables standard QoS and changes the auto-QoS settings to the standard-QoS default settings for that interface.

To disable auto-QoS on the switch, use the no mls qos global configuration command. When you enter this command, the switch disables QoS on all interfaces and enables pass-through mode.

Examples

This example shows how to enable auto-QoS and to trust the QoS labels received in incoming packets when the switch or router connected to Gigabit Ethernet interface 0/1 is a trusted device:

Switch(config)# interface gigabitethernet0/1
Switch(config-if)# auto qos voip trust

This example shows how to enable auto-QoS and to trust the QoS labels received in incoming packets when the device connected to Fast Ethernet interface 0/1 is detected as a Cisco IP phone:

Switch(config)# interface fastethernet0/1
Switch(config-if)# auto qos voip cisco-phone

This example shows how to display the QoS configuration that is automatically generated when auto-QoS is enabled:

Switch# debug autoqos
AutoQoS debugging is on
Switch# configure terminal
Enter configuration commands, one per line.  End with CNTL/Z.
Switch(config)# interface fastethernet0/1
Switch(config-if)# auto qos voip trust
Switch(config-if)#
4d22h:mls qos map cos-dscp 0 8 16 26 32 46 48 56
4d22h:mls qos min-reserve 5 170
4d22h:mls qos min-reserve 6 10
4d22h:mls qos min-reserve 7 65
4d22h:mls qos min-reserve 8 26
4d22h:mls qos
4d22h:interface FastEthernet0/1
4d22h: mls qos trust cos
4d22h: wrr-queue bandwidth 20 1 80 0
4d22h: wrr-queue min-reserve 1 5
4d22h: wrr-queue min-reserve 2 6
4d22h: wrr-queue min-reserve 3 7
4d22h: wrr-queue min-reserve 4 8
4d22h: no wrr-queue cos-map
4d22h: wrr-queue cos-map 1 0 1 2 4
4d22h: wrr-queue cos-map 3 3 6 7
4d22h: wrr-queue cos-map 4 5
4d22h: priority-queue out
Switchconfig-if)# interface gigabitethernet0/1
Switch(config-if)# auto qos voip cisco-phone
Switch(config-if)#
4d22h:interface GigabitEthernet0/1
4d22h: mls qos trust device cisco-phone
4d22h: mls qos trust cos
4d22h: wrr-queue bandwidth 20 1 80 0
4d22h: wrr-queue queue-limit 80 1 20 1
4d22h: no wrr-queue cos-map
4d22h: wrr-queue cos-map 1 0 1 2 4
4d22h: wrr-queue cos-map 3 3 6 7
4d22h: wrr-queue cos-map 4 5
4d22h: priority-queue out
Switch(config-if)#

You can verify your settings by entering the show auto qos interface interface-id privileged EXEC command.

Related Commands

Command
Description

debug autoqos

Enables debugging of the auto-QoS feature.

mls qos map {cos-dscp dscp1 ... dscp8 | dscp-cos dscp-list to cos}

Defines the CoS-to-DSCP map or the DSCP-to-CoS map.

mls qos trust

Configures the port trust state.

show auto qos

Displays auto-QoS information.

show mls qos

Displays global QoS configuration information.

show mls qos interface

Displays QoS information at the interface level.

show mls qos maps

Displays QoS mapping information.


boot boothlpr

Use the boot boothlpr global configuration command to load a special Cisco IOS image, which when loaded into memory, can load a second Cisco IOS image into memory and launch it. This variable is used only for internal development and testing. Use the no form of this command to return to the default setting.

boot boothlpr filesystem:/file-url

no boot boothlpr

Syntax Description

filesystem:

Alias for a Flash file system. Use flash: for the system board Flash device.

/file-url

The path (directory) and name of a bootable helper image.


Defaults

No helper image is loaded.

Command Modes

Global configuration

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.


Usage Guidelines

Filenames and directory names are case sensitive.

This command changes the setting of the BOOTHLPR environment variable. For more information, see "Boot Loader Commands."

Related Commands

Command
Description

show boot

Displays the settings of the boot environment variables.


boot buffersize

Use the boot buffersize global configuration command to specify the size of the file system-simulated nonvolatile RAM (NVRAM) in Flash memory. The buffer holds a copy of the configuration file in memory. Use the no form of this command to return to the default setting.

boot buffersize size

no boot buffersize

Syntax Description

size

The buffer allocation size in bytes. The range is 4096 to 524288 bytes.


Defaults

The default is 32 KB.

Command Modes

Global configuration

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.


Usage Guidelines

The configuration file cannot be larger than the buffer size allocation.

You must reload the switch by using the reload privileged EXEC command for this command to take effect.

This command changes the setting of the CONFIG_BUFSIZE environment variable. For more information, see "Boot Loader Commands."

Related Commands

Command
Description

show boot

Displays the settings of the boot environment variables.


boot config-file

Use the boot config-file global configuration command to specify the filename that Cisco IOS uses to read and write a nonvolatile copy of the system configuration. Use the no form of this command to return to the default setting.

boot config-file flash:/file-url

no boot config-file

Syntax Description

flash:/file-url

The path (directory) and name of the configuration file.


Defaults

The default configuration file is flash:config.text.

Command Modes

Global configuration

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.


Usage Guidelines

Filenames and directory names are case sensitive.

This command changes the setting of the CONFIG_FILE environment variable. For more information, see "Boot Loader Commands."

Related Commands

Command
Description

show boot

Displays the settings of the boot environment variables.


boot enable-break

Use the boot enable-break global configuration command to enable interrupting the automatic boot process. Use the no form of this command to return to the default setting.

boot enable-break

no boot enable-break

Syntax Description

This command has no arguments or keywords.

Defaults

Disabled. The automatic boot process cannot be interrupted by pressing the Break key on the console.

Command Modes

Global configuration

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.


Usage Guidelines

When you enter this command, you can interrupt the automatic boot process by pressing the Break key on the console after the Flash file system is initialized.


Note Despite the setting of this command, you can interrupt the automatic boot process at any time by pressing the MODE button on the switch front panel.


This command changes the setting of the ENABLE_BREAK environment variable. For more information, see "Boot Loader Commands."

Related Commands

Command
Description

show boot

Displays the settings of the boot environment variables.


boot helper

Use the boot helper global configuration command to dynamically load files during boot loader initialization to extend or patch the functionality of the boot loader. Use the no form of this command to return to the default.

boot helper filesystem:/file-url ...

no boot helper

Syntax Description

filesystem:

Alias for a Flash file system. Use flash: for the system board Flash device.

/file-url

The path (directory) and a list of loadable files to dynamically load during loader initialization. Separate each image name with a semicolon.


Defaults

No helper files are loaded.

Command Modes

Global configuration

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.


Usage Guidelines

Filenames and directory names are case sensitive.

This command changes the setting of the HELPER environment variable. For more information, see "Boot Loader Commands."

Related Commands

Command
Description

show boot

Displays the settings of the boot environment variables.


boot helper-config-file

Use the boot helper-config-file global configuration command to specify the name of the configuration file to be used by the Cisco IOS helper image. If this is not set, the file specified by the CONFIG_FILE environment variable is used by all versions of Cisco IOS that are loaded. This variable is used only for internal development and testing. Use the no form of this command to return to the default setting.

boot helper-config-file filesystem:/file-url

no boot helper-config file

Syntax Description

filesystem:

Alias for a Flash file system. Use flash: for the system board Flash device.

/file-url

The path (directory) and helper configuration file to load.


Defaults

No helper configuration file is specified.

Command Modes

Global configuration

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.


Usage Guidelines

Filenames and directory names are case sensitive.

This command changes the setting of the HELPER_CONFIG_FILE environment variable. For more information, see "Boot Loader Commands."

Related Commands

Command
Description

show boot

Displays the settings of the boot environment variables.


boot manual

Use the boot manual global configuration command to enable manually booting the switch during the next boot cycle. Use the no form of this command to return to the default setting.

boot manual

no boot manual

Syntax Description

This command has no arguments or keywords.

Defaults

Manual booting is disabled.

Command Modes

Global configuration

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.


Usage Guidelines

The next time you reboot the system, the switch is in boot loader mode, which is shown by the switch: prompt. To boot the system, use the boot boot loader command, and specify the name of the bootable image.

This command changes the setting of the MANUAL_BOOT environment variable. For more information, see "Boot Loader Commands."

Related Commands

Command
Description

show boot

Displays the settings of the boot environment variables.


boot private-config-file

Use the boot private-config-file global configuration command to specify the filename that Cisco IOS uses to read and write a nonvolatile copy of the private configuration. Use the no form of this command to return to the default setting.

boot private-config-file filename

no boot private-config-file

Syntax Description

filename

The name of the private configuration file.


Defaults

The default configuration file is private-config.text.

Command Modes

Global configuration

Command History

Release
Modification

12.1(11)EA1

This command was first introduced.


Usage Guidelines

Only the Cisco IOS software can read and write a copy of the private configuration file. You cannot read, write, delete, or display a copy of this file.

Filenames are case sensitive.

Examples

This example shows how to specify the name of the private configuration file to be pconfig:

Switch(config)# boot private-config-file pconfig

Related Commands

Command
Description

show boot

Displays the settings of the boot environment variables.


boot system

Use the boot system global configuration command to specify the Cisco IOS image to load during the next boot cycle. Use the no form of this command to return to the default setting.

boot system filesystem:/file-url ...

no boot system

Syntax Description

filesystem:

Alias for a Flash file system. Use flash: for the system board Flash device.

/file-url

The path (directory) and name of a bootable image. Separate image names with a semicolon.


Defaults

The switch attempts to automatically boot the system by using information in the BOOT environment variable. If this variable is not set, the switch attempts to load and execute the first executable image it can by performing a recursive, depth-first search throughout 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.

Command Modes

Global configuration

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.


Usage Guidelines

Filenames and directory names are case sensitive.

If you are using the archive download-sw privileged EXEC command to maintain system images, you never need to use the boot system command. The boot system command is automatically manipulated to load the downloaded image.

This command changes the setting of the BOOT environment variable. For more information, see "Boot Loader Commands."

Related Commands

Command
Description

show boot

Displays the settings of the boot environment variables.


channel-group

Use the channel-group interface configuration command to assign an Ethernet interface to an EtherChannel group. Use the no form of this command to remove an Ethernet interface from an EtherChannel group.

channel-group channel-group-number mode {auto [non-silent] | desirable [non-silent] | on | active | passive}

no channel-group

Syntax Description

channel-group-number

Specify the channel group number. The range is 1 to 64.

mode

Specify the EtherChannel Port Aggregation Protocol (PAgP) mode of the interface.

active

Unconditionally enable Link Aggregration Control Protocol (LACP).

Active mode places an interface into a negotiating state in which the interface initiates negotiations with other interfaces by sending LACP packets. A channel is formed with another port group in either the active or passive mode. When active is enabled, silent operation is the default.

auto

Enable PAgP only if a PAgP device is detected.

Auto mode places an interface into a passive negotiating state, in which the interface responds to PAgP packets it receives but does not start PAgP packet negotiation. A channel is formed only with another port group in desirable mode. When auto is enabled, silent operation is the default.

desirable

Unconditionally enable PAgP.

Desirable mode places an interface into an active negotiating state, in which the interface starts negotiations with other interfaces by sending PAgP packets. A channel is formed with another port group in either the desirable or auto mode. When desirable is enabled, silent operation is the default.

non-silent

(Optional) Used with the auto or desirable keyword when PAgP traffic is expected from the other device.

on

Force the interface to channel without PAgP or LACP.

With the on mode, a usable EtherChannel exists only when an interface group in the on mode is connected to another interface group in the on mode.

passive

Enable LACP only if a LACP device is detected.

Passive mode places an interface into a negotiating state in which the interface responds to LACP packets it receives but does not initiate LACP packet negotiation. A channel is formed only with another port group in active mode. When passive is enabled, silent operation is the default.


Defaults

No channel groups are assigned.

No mode is configured.

Command Modes

Interface configuration

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.

12.1(12c)EA1

The active and passive keywords were added.


Usage Guidelines

You do not have to create a port-channel interface before assigning a physical interface to a channel group. A port-channel interface is created automatically when the channel group gets its first physical interface, if it is not already created.

You do not have to disable the IP address that is assigned to a physical interface that is part of a channel group, but we highly recommend that you do so.

For Layer 2 EtherChannels, you must configure the channel-group interface configuration command, which automatically creates the port-channel logical interface. You cannot put Layer 2 interfaces into a manually created port-channel interface.

You create Layer 3 port channels by using the interface port-channel command. You must manually configure the port-channel logical interface before putting the interface into the channel group.

Any configuration or attribute changes you make to the port-channel interface are propagated to all interfaces within the same channel group as the port channel (for example, configuration changes are also propagated to the physical interfaces that are not part of the port channel, but are part of the channel group).

If you do not specify non-silent with the auto or desirable mode, silent is assumed. The silent mode is used when the switch is connected to a device that is not PAgP-capable and seldom, if ever, sends packets. A example of a silent partner is a file server or a packet analyzer that is not generating traffic. In this case, running PAgP on a physical port prevents that port from ever becoming operational; however, it allows PAgP to operate, to attach the interface to a channel group, and to use the interface for transmission. Both ends of the link cannot be set to silent.

With the on mode, a usable PAgP EtherChannel exists only when a port group in on mode is connected to another port group in on mode.


Caution You should exercise care when setting the mode to on (manual configuration). All ports configured in the on mode are bundled together in the same group and are forced to have similar characteristics. If the group is misconfigured, packet loss or spanning-tree loops might occur.


Note You cannot enable both PAgP and LACP modes on an EtherChannel group.


Before enabling 802.1X on a port, you must first remove it from the EtherChannel. If you try to enable 802.1X on an EtherChannel or on an active port in an EtherChannel, an error message appears, and 802.1X is not enabled. If you enable 802.1X on a not-yet active port of an EtherChannel, the port does not join the EtherChannel.

Do not configure a secure port as part of an EtherChannel.


Caution Do not enable Layer 3 addresses on the physical EtherChannel interfaces. Do not assign bridge groups on the physical EtherChannel interfaces because it creates loops.

Examples

This example shows how to assign Gigabit Ethernet interfaces 0/4 and 0/5 as static-access ports in VLAN 10 to channel 5 with the PAgP mode desirable:

Switch# configure terminal 
Switch(config)# interface range gigabitethernet0/4 -5 
Switch(config-if-range)# switchport mode access
Switch(config-if-range)# switchport access vlan 10
Switch(config-if-range)# channel-group 5 mode desirable 
Switch(config-if-range)# end 

This example shows how to set an EtherChannel into PAgP mode:

Switch(config-if)# channel-group 1 mode auto 
Creating a port-channel interface Port-channel 1

This example shows how to set an EtherChannel into LACP mode:

Switch(config-if)# channel-group 1 mode passive 
Creating a port-channel interface Port-channel 1

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

Related Commands

Command
Description

interface port-channel

Accesses or creates the port channel.

show pagp

Display PAgP information.

show lacp

Display LACP information.

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.


channel-protocol

Use the channel-protocol interface configuration command to configure an EtherChannel for the Port Aggregation Protocol (PAgP) or Link Aggregation Control Protocol (LACP). Use the no form of this command to disable PAgP or LACP on the EtherChannel.

channel-protocol {lacp | pagp}

no channel-protocol

Syntax Description

lacp

Configure an EtherChannel with the LACP protocol.

pagp

Configure an EtherChannel with the PAgP protocol.


Defaults

No protocol is assigned to the EtherChannel.

Command Modes

Interface configuration

Command History

Release
Modification

12.1(12c)EA1

This command was first introduced.


Usage Guidelines

Use the channel-protocol command only to restrict a channel to LACP or PAgP.

You must use the channel-group interface command to configure the EtherChannel parameters. The channel-group command can also set the EtherChannel for a channel.


Note You cannot enable both PAgP and LACP modes on an EtherChannel group.



Caution Do not enable Layer 3 addresses on the physical EtherChannel interfaces. To prevent loops, do not assign bridge groups on the physical EtherChannel interfaces.

Examples

This example shows how to set an EtherChannel into PAgP mode:

Switch(config-if)# channel-protocol pagp

This example shows how to set an EtherChannel into LACP mode:

Switch(config-if)# channel-protocol lacp

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

Related Commands

Command
Description

show pagp

Display PAgP information.

show lacp

Display LACP information.

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.


class

Use the class policy-map configuration command to define a traffic classification for the policy to act on. Use the no form of this command to delete an existing class map.

class class-map-name

no class class-map-name

Syntax Description

class-map-name

Name of the class map.



Note Though visible in the command-line help strings, the class class-default option is not supported.


Defaults

No policy map class-maps are defined.

Command Modes

Policy-map configuration

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.

12.1(9)EA1

The access-group, any, dscp, destination-address, input-interface, precedence, protocol, and source-address keywords were removed.


Usage Guidelines

Use the policy-map global configuration command to identify the policy map and to enter policy-map configuration mode before you use the class command. After you specify a policy map, you can configure a policy for new classes or modify a policy for any existing classes in that policy map. You attach the policy map to an interface by using the service-policy interface configuration command.

The class name that you specify in the policy map ties the characteristics for that class to the class map and its match criteria as configured by using the class-map global configuration command.

The class command performs the same function as the class-map global configuration command. Use the class command when a new classification, which is not shared with any other ports, is needed. Use the class-map command when the map is shared among many ports.

After you enter the class command, the switch enters policy-map class configuration mode, and these configuration commands are available:

bandwidth: Although this command appears, it is not supported on Catalyst 3550 switches.

exit: exits policy-map class configuration mode and returns to policy-map configuration mode.

no: returns a command to its default setting.

police: defines a policer or aggregate policer for the classified traffic. The policer specifies the bandwidth limitations and the action to take when the limits are exceeded. For more information, see the police and police aggregate policy-map class commands.

set: specifies a value to be assigned to the classified traffic. For more information, see the set command.

trust: defines a trust state for traffic classified with the class or the class-map command. For more information, see the trust command.

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 create a policy map called policy1. When attached to the ingress direction, it matches all the incoming traffic defined in class1, sets the IP DSCP to 10, and polices the traffic at an average rate of 1 Mbps and for 20 KB bursts. Traffic exceeding the profile is marked down to a DSCP value obtained from the policed-DSCP map and then sent.

Switch(config)# policy-map policy1
Switch(config-pmap)# class class1
Switch(config-pmap-c)# set ip dscp 10
Switch(config-pmap-c)# police 1000000 20000 exceed-action policed-dscp-transmit
Switch(config-pmap-c)# exit

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

Related Commands

Command
Description

class-map

Creates a class map to be used for matching packets to the class whose name you specify.

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.


class-map

Use the class-map global configuration command to create a class map to be used for matching packets to the class whose name you specify and to enter class-map configuration mode. Use the no form of this command to delete an existing class map and return to global configuration mode.

class-map [match-all | match-any] class-map-name

no class-map [match-all | match-any] class-map-name

Syntax Description

match-all

(Optional) Perform a logical-AND of all matching statements under this class map. All criteria in the class map must be matched.

match-any

(Optional) Perform a logical-OR of the matching statements under this class map. One or more criteria must be matched.

class-map-name

Name of the class map.


Defaults

No class maps are defined.

When neither the match-all or match-any keyword is specified, the default is match-all.

Command Modes

Global configuration

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.


Usage Guidelines

Use this command to specify the name of the class for which you want to create or modify class-map match criteria and to enter class-map configuration mode.

The class-map command and its subcommands are used to define packet classification, marking, and aggregate policing as part of a globally named service policy applied on a per-interface basis.

After you are in quality of service (QoS) class-map configuration mode, these configuration commands are available:

description: describes the class map (up to 200 characters). The show class-map privileged EXEC command displays the description and the name of the class-map.

exit: exits from QoS class-map configuration mode.

match: configures classification criteria. For more information, see the match (class-map configuration) command.

no: removes a match statement from a class map.

rename: renames the current class map. If you rename a class map with a name that is already in use, this message appears:

A class-map with this name already exists

To define packet classification on a physical-port basis, only one match command per class map is supported. In this situation, the match-all and match-any keywords are equivalent.

To define packet classification on a per-port per-VLAN basis, you must use the match-all keyword with the class-map global configuration command. You also must enter the match vlan vlan-list and the match class-map class-map-name class-map configuration commands. For more information, see the "match (class-map configuration)" section.

Only one access control list (ACL) can be configured in a class map. The ACL can have multiple access control entries (ACEs).

Examples

This example shows how to configure the class map called class1. class1 has one match criterion, which is an access list called 103.

Switch(config)# access-list 103 permit any any dscp 10
Switch(config)# class-map class1
Switch(config-cmap)# match access-group 103
Switch(config-cmap)# exit

This example shows how to delete the class map class1:

Switch(config)# no class-map class1

This example shows how to configure a class map called dscp_class whose match criterion is to match IP DSCP 9. A second class map, called vlan_class, matches traffic on VLANs 10, 20 to 30, and 40 to class map dscp_class:

Switch(config)# class-map match-any dscp_class
Switch(config-cmap)# match ip dscp 9
Switch(config-cmap)# exit
Switch(config)# class-map match-all vlan_class
Switch(config-cmap)# match vlan 10 20-30 40
Switch(config-cmap)# match class-map dscp_class
Switch(config-cmap)# exit

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

Related Commands

Command
Description

match (class-map configuration)

Defines the match criteria to classify traffic.

policy-map

Creates or modifies a policy map that can be attached to multiple interfaces to specify a service policy.

show class-map

Displays QoS class maps.


clear lacp

Use the clear lacp privileged EXEC command to clear Link Aggregration Control Protocol (LACP) channel-group counters.

clear lacp {channel-group-number [counters] }

Syntax Description

channel-group-number

Channel group number. The range is 1 to 64.

counters

Clear traffic counters.


Defaults

This command has no default setting.

Command Modes

Privileged EXEC

Command History

Release
Modification

12.1(12c)EA1

This command was first introduced.


Examples

This example shows how to clear channel-group information for a specific group:

Switch# clear lacp 4

This example shows how to clear channel-group traffic counters:

Switch# clear lacp counters

You can verify that the information was deleted by entering the show lacp privileged EXEC command.

Related Commands

Command
Description

show lacp

Displays LACP channel-group information.


clear l2protocol-tunnel counters

Use the clear l2protocol-tunnel counters privileged EXEC command to clear the protocol counters in protocol tunnel ports.

clear l2protocol-tunnel counters [interface-id]

Syntax Description

interface-id

(Optional) Specify interface for which protocol counters are to be cleared.


Defaults

This command has no defaults.

Command Modes

Privileged EXEC

Command History

Release
Modification

12.1(9)EA1

This command was first introduced.


Usage Guidelines

Use this command to clear protocol tunnel counters on the switch or on the specified interface.

Examples

This example shows how to clear Layer 2 protocol tunnel counters for Gigabit Ethernet interface 0/3:

Switch # clear l2protocol-tunnel counters gigabitethernet0/3

Related Commands

Command
Description

show l2protocol-tunnel

Displays information about ports configured for Layer 2 protocol tunneling.


clear mac address-table

Use the clear mac address-table privileged EXEC command to 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. This command also clears the MAC address notification global counters.

clear mac address-table {dynamic [address mac-addr | interface interface-id | vlan vlan-id] | notification}


Note Beginning with Cisco IOS Release 12.1(11)EA1, the clear mac address-table command replaces the clear mac- address-table command (with the hyphen).


Syntax Description

dynamic

Delete all dynamic MAC addresses.

dynamic address mac-addr

(Optional) Delete the specified dynamic MAC address.

dynamic interface interface-id

(Optional) Delete all dynamic MAC addresses on the specified physical port or port channel.

dynamic vlan vlan-id

(Optional) Delete all dynamic MAC addresses for the specified VLAN. Valid IDs are from 1 to 4096.

notification

Clear the notifications in the history table and reset the counters.


Command Modes

Privileged EXEC

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.

12.1(8)EA1

The notification keyword was added.

12.1(11)EA1

The clear mac-address-table command was replaced by the clear mac address-table command.


Examples

This example shows how to remove a specific MAC address from the dynamic address table:

Switch# clear mac address-table dynamic address 0008.0070.0007

You can verify that information was deleted by entering the show mac address-table privileged EXEC command.

Related Commands

Command
Description

mac address-table notification

Enables the MAC address notification feature.

show mac address-table

Displays the MAC address table static and dynamic entries.

show mac address-table notification

Displays the MAC address notification settings for all interfaces or the specified interface.

snmp trap mac-notification

Enables the Simple Network Management Protocol (SNMP) MAC address notification trap on a specific interface.


clear pagp

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

clear pagp {channel-group-number [counters] | counters}

Syntax Description

channel-group-number

Channel group number. The range is 1 to 64.

counters

Clear traffic filters.


Defaults

This command has no default setting.

Command Modes

Privileged EXEC

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.


Examples

This example shows how to clear channel-group information for a specific group:

Switch# clear pagp 10

This example shows how to clear channel-group traffic filters:

Switch# clear pagp counters

You can verify that information was deleted by entering the show pagp privileged EXEC command.

Related Commands

Command
Description

show pagp

Displays PAgP channel-group information.


clear port-security

Use the clear port-security privileged EXEC command to delete from the MAC address table all secure addresses, all configured secure addresses, or a specific dynamic or sticky secure address on an interface.

clear port-security {all | configured | dynamic | sticky} [address mac-addr [vlan vlan-id]] | [interface interface-id]

Syntax Description

all

Delete all secure MAC addresses.

configured

Delete all configured secure MAC addresses.

dynamic

Delete all dynamic secure MAC addresses.

sticky

Delete all sticky secure MAC addresses.

address mac-addr

(Optional) Delete the specified secure MAC address.

vlan vlan-id

(Optional) Delete the specified secure MAC address from the specified VLAN.

interface interface-id

(Optional) Delete secure MAC addresses on the specified physical port or port channel.


Defaults

No default is defined.

Command Modes

Privileged EXEC

Usage Guidelines

If you enter the clear port-security all privileged EXEC command, the switch removes all secure MAC addresses from the MAC address table.

If you enter the clear port-security configured address mac-addr vlan vlan-id command, the switch removes the specified secure MAC address from the specified VLAN.

If you enter the clear port-security configured address mac-address command, the switch removes the specified secure MAC address from the MAC address table.

If you enter the clear port-security dynamic interface interface-id command, the switch removes all dynamic secure MAC addresses on an interface from the MAC address table.

If you enter the clear port-security sticky command, the switch removes all sticky secure MAC addresses from the MAC address table.

Command History

Release
Modification

12.1(11)EA1

This command was first introduced.

12.1(14)EA1

The all, configured, and vlan keywords were added.


Examples

This example shows how to remove all secure addresses from the MAC address table:

Switch# clear port-security all

This example shows how to remove a configured secure address from the MAC address table:

Switch# clear port-security configured address 0008.0070.0007

This example shows how to remove all the dynamic secure addresses learned on a specific interface:

Switch# clear port-security dynamic interface gigabitethernet0/1

This example shows how to remove all the sticky secure addresses from the address table:

Switch# clear port-security sticky

You can verify that the information was deleted by entering the show port-security privileged EXEC command.

Related Commands

Command
Description

show port-security

Displays the port security settings for an interface or for the switch.

switchport port-security

Enables port security on an interface.


clear setup express

Use the clear setup express privileged EXEC command to exit Express Setup mode without saving the current configuration.

clear setup express

Syntax Description

This command has no arguments or keywords.

Defaults

No default is defined.

Command Modes

Privileged EXEC

Command History

Release
Modification

12.1(14)EA1

This command was introduced.


Usage Guidelines

You can use the clear setup express privileged EXEC command to exit Express Setup mode. For example, if you activate Express Setup and then decide to connect to the switch through the console port instead of through an Ethernet port, enter the clear setup express command. The switch exits Express Setup mode. The IP address 10.0.0.1 is no longer valid on the switch, and your connection using this IP address is ended.

This command is available only when the switch is in Express Setup mode.

Examples

This example shows how to exit Express Setup mode:

Switch# clear setup express

You can verify that the switch has exited Express Setup mode by entering the show express setup privileged EXEC command.

Related Commands

Command
Description

setup express

Enables Express Setup mode on the switch.

show setup express

Displays if Express Setup mode is active on the switch.


clear spanning-tree counters

Use the clear spanning-tree counters privileged EXEC command to clear the spanning-tree counters.

clear spanning-tree counters [interface interface-id]

Syntax Description

interface interface-id

(Optional) Clear all spanning-tree counters on the specified interface. If interface-id is not specified, spanning-tree counters are cleared for all interfaces.


Defaults

No default is defined.

Command Modes

Privileged EXEC

Command History

Release
Modification

12.1(13)EA1

This command was first introduced.


Examples

This example shows how to clear spanning-tree counters for all interfaces:

Switch# clear spanning-tree counters

Related Commands

Command
Description

show spanning-tree

Displays spanning-tree state information.


clear spanning-tree detected-protocols

Use the clear spanning-tree detected-protocols privileged EXEC command to restart the protocol migration process (force the renegotiation with neighboring switches) on all interfaces or on the specified interface.

clear spanning-tree detected-protocols [interface interface-id]

Syntax Description

interface interface-id

(Optional) Restart the protocol migration process on the specified interface. Valid interfaces include physical ports, VLANs, and port channels. The valid VLAN range is 1 to 4094. The valid port-channel range is 1 to 64.


Command Modes

Privileged EXEC

Command History

Release
Modification

12.1(9)EA1

This command was first introduced.


Usage Guidelines

A switch running the rapid per-VLAN spanning-tree plus (rapid-PVST+) protocol or the Multiple Spanning Tree Protocol (MSTP) supports a built-in protocol migration mechanism that enables it to interoperate with legacy 802.1D switches. If a rapid-PVST+ switch or an MSTP switch receives a legacy 802.1D configuration bridge protocol data unit (BPDU) with the protocol version set to 0, it sends only 802.1D BPDUs on that port. A multiple spanning-tree (MST) switch can also detect that a port is at the boundary of a region when it receives a legacy BPDU, an MST BPDU (version 3) associated with a different region, or an RST BPDU (version 2).

However, the switch does not automatically revert to the rapid-PVST+ or MSTP mode if it no longer receives 802.1D BPDUs because it cannot determine whether the legacy switch has been removed from the link unless the legacy switch is the designated switch. Use the clear spanning-tree detected-protocols command in this situation.

Examples

This example shows how to restart the protocol migration process on Fast Ethernet interface 0/1:

Switch# clear spanning-tree detected-protocols interface fastethernet0/1

clear vmps statistics

Use the clear vmps statistics privileged EXEC command to clear the statistics maintained by the VLAN Query Protocol (VQP) client.

clear vmps statistics

Syntax Description

This command has no arguments or keywords.

Defaults

No default is defined.

Command Modes

Privileged EXEC

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.


Examples

This example shows how to clear VLAN Membership Policy Server (VMPS) statistics:

Switch# clear vmps statistics

You can verify that information was deleted by entering the show vmps statistics privileged EXEC command.

Related Commands

Command
Description

show vmps

Displays the VQP version, reconfirmation interval, retry count, VMPS IP addresses, and the current and primary servers.


clear vtp counters

Use the clear vtp counters privileged EXEC command to clear the VLAN Trunking Protocol (VTP) and pruning counters.

clear vtp counters

Syntax Description

This command has no arguments or keywords.

Defaults

No default is defined.

Command Modes

Privileged EXEC

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.


Examples

This example shows how to clear the VTP counters:

Switch# clear vtp counters

You can verify that information was deleted by entering the show vtp counters privileged EXEC command.

Related Commands

Command
Description

show vtp

Displays general information about the VTP management domain, status, and counters.


cluster commander-address

You do not need to enter this command. The command switch automatically provides its MAC address to member switches when these switches join the cluster. The member switch adds this information and other cluster information to its running configuration file. Use the no form of this command from the member switch console port to remove it from a cluster only during debugging or recovery procedures.

cluster commander-address mac-address [member number name name]

no cluster commander-address

Syntax Description

mac-address

MAC address of the cluster command switch.

member number

(Optional) Number of a configured member switch. The range is from 0 to 15.

name name

(Optional) Name of the configured cluster up to 31 characters.


Defaults

The switch is not a member of any cluster.

Command Modes

Global configuration

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.


Usage Guidelines

A cluster member can have only one command switch.

The member switch retains the identity of the command switch during a system reload by using the mac-address parameter.

You can enter the no form on a member switch to remove it from the cluster during debugging or recovery procedures. You would normally use this command from the member switch console port only when the member has lost communication with the command switch. With normal switch configuration, we recommend that you remove member switches only by entering the no cluster member n global configuration command on the command switch.

When a standby command switch becomes active (becomes the command switch), it removes the cluster commander address line from its configuration.

Examples

This is partial sample output from the running configuration of a cluster member.

Switch(config)# show running-config

<output truncated>

cluster commander-address 00e0.9bc0.a500 member 4 name my_cluster

<output truncated>

This example shows how to remove a member from the cluster by using the cluster member console.

Switch # configure terminal
Enter configuration commands, one per line.  End with CNTL/Z.
Switch(config)# no cluster commander-address

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

Related Commands

Command
Description

show cluster

Displays the cluster status and a summary of the cluster to which the switch belongs.


cluster discovery hop-count

Use the cluster discovery hop-count global configuration command on the command switch to set the hop-count limit for extended discovery of candidate switches. Use the no form of this command to return to the default setting.

cluster discovery hop-count number

no cluster discovery hop-count

Syntax Description

number

Number of hops from the cluster edge that the command switch limits the discovery of candidates. The range is from 1 to 7.


Defaults

The hop count is set to 3.

Command Modes

Global configuration

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.


Usage Guidelines

Enter this command only on the command switch. This command does not operate on member switches.

If the hop count is set to 1, it disables extended discovery. The command switch discovers only candidates that are one hop from the edge of the cluster. The edge of the cluster is the point between the last discovered member switch and the first discovered candidate switch.

Examples

This example shows how to set hop count limit to 4. This command is executed on the command switch.

Switch(config)# cluster discovery hop-count 4

You can verify your setting by entering the show cluster privileged EXEC command.

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.


cluster enable

Use the cluster enable global configuration command on a command-capable switch to enable it as the cluster command switch, assign a cluster name, and to optionally assign a member number to it. Use the no form of this command to remove all members and to make the command switch a candidate switch.

cluster enable name [command-switch-member-number]

no cluster enable

Syntax Description

name

Name of the cluster up to 31 characters. Valid characters include only alphanumerics, dashes, and underscores.

command-switch-member-number

(Optional) Assign a member number to the command switch of the cluster. The range is from 0 to 15.


Defaults

The switch is not a command switch.

No cluster name is defined.

The member number is 0 when the switch is the command switch.

Command Modes

Global configuration

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.


Usage Guidelines

This command runs on any command-capable switch that is not part of any cluster. This command fails if a device is already configured as a member of the cluster.

You must name the cluster when you enable the command switch. If the switch is already configured as the command switch, this command changes the cluster name if it is different from the previous cluster name.

Examples

This example shows how to enable the command switch, name the cluster, and set the command switch member number to 4.

Switch(config)# cluster enable Engineering-IDF4 4

You can verify your setting by entering the show cluster privileged EXEC command on the command switch.

Related Commands

Command
Description

show cluster

Displays the cluster status and a summary of the cluster to which the switch belongs.


cluster holdtime

Use the cluster holdtime global configuration command on the command switch to set the duration in seconds before a switch (either the command or member switch) declares the other switch down after not receiving heartbeat messages. Use the no form of this command to set the duration to the default value.

cluster holdtime holdtime-in-secs

no cluster holdtime

Syntax Description

holdtime-in-secs

Duration in seconds before a switch (either a command or member switch) declares the other switch down. The range is from 1 to 300 seconds.


Defaults

The default holdtime is 80 seconds.

Command Modes

Global configuration

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.


Usage Guidelines

Use this command with the cluster timer global configuration command only on the command switch. The command switch propagates the values to all its cluster members so that the setting is consistent among all switches in the cluster.

The holdtime is typically set as a multiple of the interval timer (cluster timer). For example, it takes (holdtime-in-secs divided by the interval-in-secs) number of heartbeat messages to be missed in a row to declare a switch down.

Examples

This example shows how to change the interval timer and the duration on the command switch.

Switch(config)# cluster timer 3
Switch(config)# cluster holdtime 30

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

Related Commands

Command
Description

show cluster

Displays the cluster status and a summary of the cluster to which the switch belongs.


cluster member

Use the cluster member global configuration command on the command switch to add candidates to a cluster. Use the no form of this command to remove members from the cluster.

cluster member [n] mac-address H.H.H [password enable-password] [vlan vlan-id]

no cluster member n

Syntax Description

n

The number that identifies a cluster member. The range is from 0 to 15.

mac-address H.H.H

MAC address of the member switch in hexadecimal format.

password enable-password

Enable password of the candidate switch. The password is not required if there is no password on the candidate switch.

vlan vlan-id

(Optional) VLAN ID through which the candidate is added to the cluster by the command switch. The range is 1 to 4094.


Defaults

A newly enabled command switch has no associated cluster members.

Command Modes

Global configuration

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.


Usage Guidelines

Enter this command only on the command switch to add a candidate to or remove a member from the cluster. If you enter this command on a switch other than the command switch, the switch rejects the command and displays an error message.

You must enter a member number to remove a switch from the cluster. However, you do not need to enter a member number to add a switch to the cluster. The command switch selects the next available member number and assigns it to the switch that is joining the cluster.

You must enter the enable password of the candidate switch for authentication when it joins the cluster. The password is not saved in the running or startup configuration. After a candidate switch becomes a member of the cluster, its password becomes the same as the command-switch password.

If a switch does not have a configured host name, the command switch appends a member number to the command-switch host name and assigns it to the member switch.

If you do not specify a VLAN ID, the command switch automatically chooses a VLAN and adds the candidate to the cluster.

Examples

This example shows how to add a switch as member 2 with MAC address 00E0.1E00.2222 and the password key to a cluster. The command switch adds the candidate to the cluster through VLAN 3.

Switch(config)# cluster member 2 mac-address 00E0.1E00.2222 password key vlan 3

This example shows how to add a switch with MAC address 00E0.1E00.3333 to the cluster. This switch does not have a password. The command switch selects the next available member number and assigns it to the switch that is joining the cluster.

Switch(config)# cluster member mac-address 00E0.1E00.3333

You can verify your settings by entering the show cluster members privileged EXEC command on the command switch.

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 cluster members

Displays information about the cluster members.


cluster outside-interface

Use the cluster outside-interface global configuration command to configure the outside interface for cluster Network Address Translation (NAT) so that a member without an IP address can communicate with devices outside the cluster. Use the no form of this command to return to the default setting.

cluster outside-interface interface-id

no cluster outside-interface

Syntax Description

interface-id

Interface to serve as the outside interface. Valid interfaces include physical interfaces, port-channels, or VLANs. The port-channel range is 1 to 64. The VLAN range is 1 to 4094.


Defaults

The default outside interface is automatically selected by the command switch.

Command Modes

Global configuration

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.


Usage Guidelines

Enter this command only on the command switch. If you enter this command on a member switch, an error message appears.

Examples

This example shows how to set the outside interface to VLAN 1:

Switch(config)# cluster outside-interface vlan 1

You can verify your setting 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 the Cisco IOS Configuration Fundamentals Command Reference for Release 12.1 > Cisco IOS File Management Commands > Configuration File Commands.


cluster run

Use the cluster run global configuration command to enable clustering on a switch. Use the no form of this command to disable clustering on a switch.

cluster run

no cluster run

Syntax Description

This command has no arguments or keywords.

Defaults

Clustering is enabled on all switches.

Command Modes

Global configuration

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.


Usage Guidelines

When you enter the no cluster run command on a command switch, the command switch is disabled. Clustering is disabled, and the switch is incapable of becoming a candidate switch.

When you enter the no cluster run command on a member switch, it is removed from the cluster. Clustering is disabled, and the switch is incapable of becoming a candidate switch.

When you enter the no cluster run command on a switch that is not part of a cluster, clustering is disabled on this switch. This switch cannot then become a candidate switch.

Examples

This example shows how to disable clustering on the command switch:

Switch(config)# no cluster run

You can verify your setting by entering the show cluster privileged EXEC command.

Related Commands

Command
Description

show cluster

Displays the cluster status and a summary of the cluster to which the switch belongs.


cluster standby-group

Use the cluster standby-group global configuration command to enable command-switch redundancy by binding the cluster to an existing Hot Standby Router Protocol (HSRP). Entering the routing-redundancy keyword enables the same HSRP group to be used for command-switch redundancy and routing redundancy. Use the no form of this command to return to the default setting.

cluster standby-group HSRP-group-name [routing-redundancy]

no cluster standby-group

Syntax Description

HSRP-group-name

Name of the HSRP group that is bound to the cluster. The group name is limited to 32 characters.

routing-redundancy

(Optional) Enable the same HSRP standby group to be used for command-switch redundancy and routing redundancy.


Defaults

The cluster is not bound to any HSRP group.

Command Modes

Global configuration

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.


Usage Guidelines

You must enter this command only on the command switch. If you enter it on a member switch, an error message appears.

The command switch propagates the cluster-HSRP binding information to all cluster-HSRP capable members. Each member switch stores the binding information in its nonvolatile RAM (NVRAM).

The HSRP group name must be a valid standby group; otherwise, the command exits with an error.

The same group name should be used on all members of the HSRP standby group that is to be bound to the cluster. The same HSRP group name should also be used on all cluster-HSRP capable members for the HSRP group that is to be bound. (When not binding a cluster to an HSRP group, you can use different names for the cluster commander and the members.)

Examples

This example shows how to bind the HSRP group named my_hsrp to the cluster. This command is executed on the command switch.

Switch(config)# cluster standby-group my_hsrp 

This example shows how to use the same HSRP group named my_hsrp for routing redundancy and cluster redundancy.

Switch(config)# cluster standby-group my_hsrp routing-redundancy

This example shows the error message when this command is executed on a command switch and the specified HSRP standby group does not exist:

Switch(config)# cluster standby-group my_hsrp 
%ERROR: Standby (my_hsrp) group does not exist

This example shows the error message when this command is executed on a member switch:

Switch(config)# cluster standby-group my_hsrp routing-redundancy
%ERROR: This command runs on a cluster command switch

You can verify your settings by entering the show cluster privileged EXEC command. The output shows whether redundancy is enabled in the cluster.

Related Commands

Command
Description

standby ip

Enables HSRP on the interface. For syntax information, select Cisco IOS IP and IP Routing Command Reference for IOS Release 12.1 > IP Addressing and Services > IP Services Commands.

show cluster

Displays the cluster status and a summary of the cluster to which the switch belongs.

show standby

Displays standby group information. For syntax information, select Cisco IOS IP and IP Routing Command Reference for IOS Release 12.1 > IP Addressing and Services > IP Services Commands.


cluster timer

Use the cluster timer global configuration command on the command switch to set the interval in seconds between heartbeat messages. Use the no form of this command to set the interval to the default value.

cluster timer interval-in-secs

no cluster timer

Syntax Description

interval-in-secs

Interval in seconds between heartbeat messages. The range is from 1 to 300 seconds.


Defaults

The interval is 8 seconds.

Command Modes

Global configuration

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.


Usage Guidelines

Use this command with the cluster holdtime global configuration command only on the command switch. The command switch propagates the values to all its cluster members so that the setting is consistent among all switches in the cluster.

The holdtime is typically set as a multiple of the heartbeat interval timer (cluster timer). For example, it takes (holdtime-in-secs divided by the interval-in-secs) number of heartbeat messages to be missed in a row to declare a switch down.

Examples

This example shows how to change the heartbeat interval timer and the duration on the command switch:

Switch(config)# cluster timer 3
Switch(config)# cluster holdtime 30

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

Related Commands

Command
Description

show cluster

Displays the cluster status and a summary of the cluster to which the switch belongs.


define interface-range

Use the define interface-range global configuration command to create an interface-range macro. Use the no form of this command to delete the defined macro.

define interface-range macro-name interface-range

no define interface-range macro-name interface-range

Syntax Description

macro-name

Name of the interface-range macro; up to 32 characters.

interface-range

Interface range; for valid values for interface ranges, see "Usage Guidelines."


Defaults

This command has no default setting.

Command Modes

Global configuration

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.


Usage Guidelines

The macro name is a 32-character maximum character string.

A macro can contain up to five ranges.

All interfaces in a range must be the same type; that is, all Fast Ethernet ports, all Gigabit Ethernet ports, all EtherChannel ports, or all VLANs, but you can combine multiple interface types in a macro.

When entering the interface-range, use this format:

type {first-interface} - {last-interface}

You must add a space between the first interface number and the hyphen when entering an interface-range. For example, gigabitethernet 0/1 -5 is a valid range; gigabitethernet 0/1-5 is not a valid range.

Valid values for type and interface:

vlan vlan-id, where vlan-id is from 1 to 4094; do not enter leading zeros

port-channel port-channel-number, where port-channel-number is from 1 to 64

fastethernet interface-id

gigabitethernet interface-id

VLAN interfaces must have been configured with the interface vlan command (the show running-config privileged EXEC command displays the configured VLAN interfaces). VLAN interfaces not displayed by the show running-config command cannot be used in interface-ranges.

For physical interfaces, the interface-id is defined as slot/number (where slot is always 0 for the Catalyst 3550 switch), and the range can be entered as one of the following:

type 0/number - number (for example, gigabitethernet0/1 -2)

type 0/number - 0/number (for example, gigabitethernet 0/1 - 0/2)

You can also enter multiple ranges.

When you define a range, you must enter a space before and after the hyphen (-), for example, gigabitethernet0/1 - 2


When you define multiple ranges, you must enter a space before and after the comma (,), for example, fastethernet0/3 - 7 , gigabitethernet0/1 - 2

Examples

This example shows how to create a multiple-interface macro:

Switch(config)# define interface-range macro1 gigabitethernet 0/1 -2 , gigabitethernet 0/5 

Related Commands

Command
Description

interface range

Executes a command on multiple ports at the same time.

show running-config

Displays the current operating configuration, including defined macros. For syntax information, select Cisco IOS Configuration Fundamentals Command Reference for Release 12.1 > Cisco IOS File Management Commands > Configuration File Commands.


delete

Use the delete privileged EXEC command to delete a file or directory on the Flash memory device.

delete [/force] [/recursive] filesystem:/file-url

Syntax Description

/force

(Optional) Suppress the prompt that confirms the deletion.

/recursive

(Optional) Delete the named directory and all subdirectories and the files contained in it.

filesystem:

Alias for a Flash file system. Use flash: for the system board Flash device.

/file-url

The path (directory) and filename to delete.


Command Modes

Privileged EXEC

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.


Usage Guidelines

If you use the /force keyword, you are prompted at the beginning of the deletion process to confirm the deletion.

If you use the /recursive keyword without the /force keyword, you are prompted to confirm the deletion of every file.

The prompting behavior depends on the setting of the file prompt global configuration command. By default, the switch prompts for confirmation on destructive file operations. For more information about this command, refer to the Cisco IOS Command Reference for Release 12.1.

Examples

This example shows how to remove the directory that contains the old software image after a successful download of a new image:

Switch# delete /force /recursive flash:/old-image

You can verify that the directory was removed by entering the dir filesystem: privileged EXEC command.

Related Commands

Command
Description

archive download-sw

Downloads a new image to the switch and overwrites or keeps the existing image.


deny

Use the deny MAC access list configuration command to prevent non-IP traffic from being forwarded if the conditions are matched. Use the no form of this command to remove a deny condition from the named MAC access list.

{deny | permit} {any | host src-MAC-addr | src-MAC-addr mask} {any | host dst-MAC-addr | dst-MAC-addr mask} [type mask | aarp | amber | cos cos | dec-spanning | decnet-iv | diagnostic | dsm | etype-6000 | etype-8042 | lat | lavc-sca | lsap lsap mask |mop-console | mop-dump | msdos | mumps | netbios | vines-echo | vines-ip | xns-idp]

no {deny | permit} {any | host src-MAC-addr | src-MAC-addr mask} {any | host dst-MAC-addr | dst-MAC-addr mask} [type mask | aarp | amber | cos cos | dec-spanning | decnet-iv | diagnostic | dsm | etype-6000 | etype-8042 | lat | lavc-sca | lsap lsap mask | mop-console | mop-dump | msdos | mumps | netbios | vines-echo | vines-ip | xns-idp]


Note Though visible in the command-line help strings, appletalk is not supported as a matching condition, nor is matching on any SNAP-encapsulated packet with a non-zero Organizational Unique Identifier (OUI).


Syntax Description

any

Keyword to specify to deny any source or destination MAC address.

host src MAC-addr |
src-MAC-addr mask

Define a host MAC address and optional subnet mask. If the source address for a packet matches the defined address, non-IP traffic from that address is denied.

host dst-MAC-addr |
dst-MAC-addr mask

Define a destination MAC address and optional subnet mask. If the destination address for a packet matches the defined address, non-IP traffic to that address is denied.

type mask

(Optional) Use the Ethertype number of a packet with Ethernet II or SNAP encapsulation to identify the protocol of the packet.

The type is from 0 to 65535, typically specified in hexadecimal.

The mask is a mask of don't care bits applied to the Ethertype before testing for a match.

aarp

(Optional) Select Ethertype AppleTalk Address Resolution Protocol that maps a data-link address to a network address.

amber

(Optional) Select EtherType DEC-Amber.

cos cos

(Optional) Select a class of service (CoS) number from 0 to 7 to set priority. Filtering on CoS can be performed only in hardware. A warning message reminds the user if the cos option is configured.

dec-spanning

(Optional) Select EtherType Digital Equipment Corporation (DEC) spanning tree.

decnet-iv

(Optional) Select EtherType DECnet Phase IV protocol.

diagnostic

(Optional) Select EtherType DEC-Diagnostic.

dsm

(Optional) Select EtherType DEC-DSM.

etype-6000

(Optional) Select EtherType 0x6000.

etype-8042

(Optional) Select EtherType 0x8042.

lat

(Optional) Select EtherType DEC-LAT.

lavc-sca

(Optional) Select EtherType DEC-LAVC-SCA.

lsap lsap-number mask

(Optional) Use the LSAP number (from 0 to 65535) of a packet with 802.2 encapsulation to identify the protocol of the packet.

mask is a mask of don't care bits applied to the LSAP number before testing for a match.

mop-console

(Optional) Select EtherType DEC-MOP Remote Console.

mop-dump

(Optional) Select EtherType DEC-MOP Dump.

msdos

(Optional) Select EtherType DEC-MSDOS.

mumps

(Optional) Select EtherType DEC-MUMPS.

netbios

(Optional) Select EtherType DEC- Network Basic Input/Output System (NETBIOS).

vines-echo

(Optional) Select EtherType Virtual Integrated Network Service (VINES) Echo from Banyan Systems.

vines-ip

(Optional) Select EtherType VINES IP.

xns-idp

(Optional) Select EtherType Xerox Network Systems (XNS) protocol suite (from 0 to 65535), an arbitrary Ethertype in decimal, hexadecimal, or octal.


To filter IPX traffic, you use the type mask or lsap lsap mask keywords, depending on the type of IPX encapsulation being used. Filter criteria for IPX encapsulation types as specified in Novell terminology and Cisco IOS terminology are listed in Table 2-3.

Table 2-3 IPX Filtering Criteria

IPX Encapsulation Type
Filter Criterion
Cisco IOS Name
Novel Name

arpa

Ethernet II

Ethertype 0x8137

snap

Ethernet-snap

Ethertype 0x8137

sap

Ethernet 802.2

LSAP 0xE0E0

novell-ether

Ethernet 802.3

LSAP 0xFFFF


Defaults

This command has no defaults. However; the default action for a MAC-named ACL is to deny.

Command Modes

MAC-access list configuration

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.


Usage Guidelines

You enter MAC-access list configuration mode by using the mac access-list extended global configuration command.

If you use the host keyword, you cannot enter an address mask; if you do not use the host keyword, you must enter an address mask.

When an access control entry (ACE) is added to an access control list, an implied deny-any-any condition exists at the end of the list. That is, if there are no matches, the packets are denied. However, before the first ACE is added, the list permits all packets.


Note For more information about named MAC extended access lists, refer to the software configuration guide for this release.


Examples

This example shows how to define the named MAC extended access list to deny NETBIOS traffic from any source to MAC address 00c0.00a0.03fa. Traffic matching this list is denied.

Switch(config-ext-macl)# deny any host 00c0.00a0.03fa netbios.

This example shows how to remove the deny condition from the named MAC extended access list:

Switch(config-ext-macl)# no deny any 00c0.00a0.03fa 0000.0000.0000 netbios.

This example denies all packets with Ethertype 0x4321:

Switch(config-ext-macl)# deny any any 0x4321 0

You can verify your settings by entering the show access-lists privileged EXEC command.

Related Commands

Command
Description

mac access-list extended

Creates an access list based on MAC addresses for non-IP traffic.

permit

Permits non-IP traffic to be forwarded if conditions are matched.

show access-lists

Displays access control lists configured on a switch.


dot1x default

Use the dot1x default interface configuration command to reset the configurable 802.1X parameters to their default values.

dot1x default

Syntax Description

This command has no arguments or keywords.

Defaults

These are the default values:

The per-interface 802.1X protocol enable state is disabled (force-authorized).

The number of seconds between re-authentication attempts is 3600 seconds.

The periodic re-authentication is disabled.

The quiet period is 60 seconds.

The retransmission time is 30 seconds.

The maximum retransmission number is 2 times.

The host mode is single host.

The client timeout period is 30 seconds.

The authentication server timeout period is 30 seconds.

Command Modes

Interface configuration

Command History

Release
Modification

12.1(8)EA1

This command was first introduced.

12.1(14)EA1

This command was changed to the interface configuration mode.


Examples

This example shows how to reset the configurable 802.1X parameters on an interface:

Switch(config-if)# dot1x default

You can verify your settings by entering the show dot1x [interface interface-id] privileged EXEC command.

Related Commands

Command
Description

show dot1x [interface interface-id]

Displays 802.1X status for the specified interface.


dot1x guest-vlan

Use the dot1x guest-vlan interface configuration command to specify an active VLAN as an 802.1X guest VLAN. Use the no form of this command to return to the default setting.

dot1x guest-vlan vlan-id

no dot1x guest-vlan

Syntax Description

vlan-id

Specify an active VLAN as an 802.1X guest VLAN. The range is 1 to 4094.


Defaults

No guest VLAN is configured.

Command Modes

Interface configuration

Command History

Release
Modification

12.1(14)EA1

This command was first introduced.


Usage Guidelines

When you configure a guest VLAN, clients that are not 802.1X-capable are put into the guest VLAN when the server does not receive a response to its Extensible Authentication Protocol over LAN (EAPOL) request/identity frame. Clients that are 802.1X-capable but fail authentication are not granted access to the network.

Guest VLANs are supported on 802.1X ports in single-host mode and multiple-hosts mode.

Any VLAN can be configured as an 802.1X guest VLAN except RSPAN VLANs, voice VLANs, or internal routed ports.

Examples

This example shows how to specify VLAN 5 as an 802.1X guest VLAN:

Switch(config-if)# dot1x guest-vlan 5

You can verify your settings by entering the show dot1x [interface interface-id] privileged EXEC command.

Related Commands

Command
Description

show dot1x [interface interface-id]

Displays 802.1X status for the specified interface.


dot1x host-mode

Use the dot1x host-mode interface configuration command to allow a single host (client) or multiple hosts on an 802.1X-authorized port that has the dot1x port-control interface configuration command set to auto. Use the no form of this command to return to the default setting.

dot1x host-mode {multi-host | single-host}

no dot1x host-mode [multi-host | single-host]

Syntax Description

multi-host

Enable multiple-hosts mode on the switch.

single-host

Enable single-host mode on the switch.


Defaults

The default is single-host mode.

Command Modes

Interface configuration

Command History

Release
Modification

12.1(14)EA1

This command was first introduced. It replaces the dot1x multiple-hosts interface configuration command.


Usage Guidelines

You can use this command to limit an 802.1X-enabled port to a single client or to attach multiple clients to an 802.1X-enabled port. In multiple-hosts mode, only one of the attached hosts must be successfully authorized for all hosts to be granted network access. If the port becomes unauthorized (re-authentication fails or an Extensible Authentication Protocol over LAN [EAPOL]-logoff message is received), all attached clients are denied access to the network.

Before entering this command, make sure that the dot1x port-control interface configuration command is set to auto for the specified interface.

Examples

This example shows how to enable 802.1X globally, enable 802.1X on Fast Ethernet interface 0/1, and enable multiple-hosts mode:

Switch(config)# dot1x system-auth-control
Switch(config)# interface fastethernet0/1
Switch(config-if)# dot1x port-control auto
Switch(config-if)# dot1x host-mode multi-host

You can verify your settings by entering the show dot1x [interface interface-id] privileged EXEC command.

Related Commands

Command
Description

show dot1x [interface interface-id]

Displays 802.1X status for the specified interface.


dot1x initialize

Use the dot1x initialize privileged EXEC command to manually return an 802.1X-enabled port to an unauthorized state before initiating a new authentication session on the interface.

dot1x initialize interface interface-id

Syntax Description

This command has no arguments or keywords.

Defaults

There is no default setting.

Command Modes

Privileged EXEC

Command History

Release
Modification

12.1(14)EA1

This command was first introduced.


Usage Guidelines

Use this command to manually return a device connected to a switch interface to an unauthorized state before initiating a new authentication session on the interface.

Examples

This example shows how to manually return a device connected to Fast Ethernet interface 0/1 to an unauthorized state:

Switch# dot1x initialize interface fastethernet0/1

You can verify your settings by entering the show dot1x [interface interface-id] privileged EXEC command.

Related Commands

Command
Description

show dot1x [interface interface-id]

Displays 802.1X status for the specified interface.


dot1x max-req

Use the dot1x max-req interface configuration command to set the maximum number of times that the switch sends an Extensible Authentication Protocol (EAP)-request/identity frame (assuming that no response is received) to the client before restarting the authentication process. Use the no form of this command to return to the default setting.

dot1x max-req count

no dot1x max-req

Syntax Description

count

Number of times that the switch sends an EAP-request/identity frame before restarting the authentication process. The range is 1 to 10.


Defaults

The default is 2.

Command Modes

Interface configuration

Command History

Release
Modification

12.1(8)EA1

This command was first introduced.

12.1(14)EA1

This command was changed to the interface configuration mode.


Usage Guidelines

You should change the default value of this command only to adjust for unusual circumstances such as unreliable links or specific behavioral problems with certain clients and authentication servers.

Examples

This example shows how to set 5 as the number of times that the switch sends an EAP-request/identity frame before restarting the authentication process:

Switch(config-if)# dot1x max-req 5

You can verify your settings by entering the show dot1x [interface interface-id] privileged EXEC command.

Related Commands

Command
Description

dot1x timeout

Sets the number of seconds that the switch waits for a response to an EAP-request/identity frame from the client before resending the request.

show dot1x [interface interface-id]

Displays 802.1X status for the specified interface.


dot1x multiple-hosts

This is an obsolete command.

In past releases, the dot1x multiple-hosts interface configuration command was used to allow multiple hosts (clients) on an 802.1X-authorized port.

Command History

Release
Modification

12.1(8)EA1

This command was first introduced.

12.1(14)EA1

The dot1x multiple-hosts interface configuration command was replaced by the dot1x host-mode interface configuration command.


Related Commands

Command
Description

dot1x host-mode

Set the 802.1X host mode on an interface.

show dot1x

Displays 802.1X statistics, administrative status, and operational status for the switch or for the specified interface.


dot1x port-control

Use the dot1x port-control interface configuration command to enable manual control of the authorization state of the port. Use the no form of this command to return to the default setting.

dot1x port-control {auto | force-authorized | force-unauthorized}

no dot1x port-control

Syntax Description

auto

Enable 802.1X authentication on the interface and cause the port to transition to the authorized or unauthorized state based on the 802.1X authentication exchange between the switch and the client.

force-authorized

Disable 802.1X authentication on the interface and cause the port to transition to the authorized state without any authentication exchange required. The port sends and receives normal traffic without 802.1X-based authentication of the client.

force-unauthorized

Deny all access through this interface by forcing the port to transition to the unauthorized state, ignoring all attempts by the client to authenticate. The switch cannot provide authentication services to the client through the interface.


Defaults

The default is force-authorized.

Command Modes

Interface configuration

Command History

Release
Modification

12.1(8)EA1

This command was first introduced.


Usage Guidelines

You must enable 802.1X globally on the switch by using the dot1x system-auth-control global configuration command before enabling 802.1X on a specific interface.

The 802.1X protocol is supported on both Layer 2 static-access ports and Layer 3 routed ports.

You can use the auto keyword only if the port is not configured as one of these:

Trunk port—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.

Dynamic ports—A port in dynamic mode can negotiate with its neighbor to become a trunk port. 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.

Dynamic-access ports—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.

EtherChannel port—Before enabling 802.1X on the port, you must first remove it from the EtherChannel. If you try to enable 802.1X on an EtherChannel or on an active port in an EtherChannel, an error message appears, and 802.1X is not enabled. If you enable 802.1X on a not-yet active port of an EtherChannel, the port does not join the EtherChannel.

Switched Port Analyzer (SPAN) destination port—You can enable 802.1X on a port that is a SPAN destination port; however, 802.1X is disabled until the port is removed as a SPAN destination. You can enable 802.1X on a SPAN source port.

To disable 802.1X globally on the switch, use the no dot1x system-auth-control global configuration command. To disable 802.1X on a specific interface, use the no dot1x port-control interface configuration command.

Examples

This example shows how to enable 802.1X on Fast Ethernet interface 0/1:

Switch(config)# interface fastethernet0/1
Switch(config-if)# dot1x port-control auto

You can verify your settings by entering the show dot1x [interface interface-id] privileged EXEC command.

Related Commands

Command
Description

show dot1x [interface interface-id]

Displays 802.1X status for the specified interface.


dot1x re-authenticate

Use the dot1x re-authenticate privileged EXEC command to manually initiate a re-authentication of all 802.1X-enabled ports or the specified 802.1X-enabled port.

dot1x re-authenticate {interface interface-id}

Syntax Description

interface interface-id

Slot and port number of the interface to re-authenticate.


Defaults

There is no default setting.

Command Modes

Privileged EXEC

Command History

Release
Modification

12.1(8)EA1

This command was first introduced.


Usage Guidelines

You can use this command to re-authenticate a client without waiting for the configured number of seconds between re-authentication attempts (re-authperiod) and automatic re-authentication.

Examples

This example shows how to manually re-authenticate the device connected to Fast Ethernet interface 0/1:

Switch# dot1x re-authenticate interface fastethernet0/1

Related Commands

Command
Description

show dot1x

Displays 802.1X statistics, administrative status, and operational status for the switch or for the specified interface.


dot1x re-authentication

This is an obsolete command.

In past releases, the dot1x re-authentication global configuration command was used to set the amount of time between periodic re-authentication attempts.

Command History

Release
Modification

12.1(8)EA1

This command was first introduced.

12.1(14)EA1

The dot1x reauthentication interface configuration command replaced the dot1x re-authentication global configuration command.


Related Commands

Command
Description

dot1x reauthentication

Sets the number of seconds between re-authentication attempts.

show dot1x

Displays 802.1X statistics, administrative status, and operational status for the switch or for the specified interface.


dot1x reauthentication

Use the dot1x reauthentication interface configuration command to enable periodic re-authentication of the client. Use the no form of this command to return to the default setting.

dot1x reauthentication

no dot1x reauthentication

Syntax Description

This command has no arguments or keywords.

Defaults

Periodic re-authentication is disabled.

Command Modes

Interface configuration

Command History

Release
Modification

12.1(14)EA1

This command was first introduced. It replaces the dot1x re-authentication global configuration command (with the hyphen).


Usage Guidelines

You configure the amount of time between periodic re-authentication attempts by using the dot1x timeout reauth-period interface configuration command.

Examples

This example shows how to disable periodic re-authentication of the client:

Switch(config-if)# no dot1x reauthentication

This example shows how to enable periodic re-authentication and to set the number of seconds between re-authentication attempts to 4000 seconds:

Switch(config-if)# dot1x reauthentication
Switch(config-if)# dot1x timeout reauth-period 4000

You can verify your settings by entering the show dot1x [interface interface-id] privileged EXEC command.

Related Commands

Command
Description

dot1x timeout

Sets the number of seconds between re-authentication attempts.

show dot1x [interface interface-id]

Displays 802.1X status for the specified interface.


dot1x system-auth-control

Use the dot1x system-auth-control global configuration command to enable 802.1X globally. Use the no form of this command to return to the default setting.

dot1x system-auth-control

no dot1x system-auth-control

Syntax Description

This command has no arguments or keywords.

Defaults

802.1X is disabled.

Command Modes

Global configuration

Command History

Release
Modification

12.1(14)EA1

This command was first introduced.


Usage Guidelines

You must enable authentication, authorization, and accounting (AAA) and specify the authentication method list before enabling 802.1X globally. A method list describes the sequence and authentication methods to be queried to authenticate a user.

Examples

This example shows how to enable 802.1X globally on a switch:

Switch(config)# dot1x system-auth-control

You can verify your settings by entering the show dot1x privileged EXEC command.

Related Commands

Command
Description

show dot1x

Displays 802.1X statistics, administrative status, and operational status for the switch or for the specified interface.


dot1x timeout

Use the dot1x timeout interface configuration command to set the 802.1X timers. Use the no form of this command to return to the default setting.

dot1x timeout {quiet-period seconds | reauth-period seconds | server-timeout seconds | supp-timeout seconds | tx-period seconds}

no dot1x timeout {quiet-period | reauth-period | server-timeout | supp-timeout | tx-period}

Syntax Description

quiet-period seconds

Number of seconds that the switch remains in the quiet state following a failed authentication exchange with the client. The range is 1 to 65535.

reauth-period seconds

Number of seconds between re-authentication attempts. The range is 1 to 65535.

server-timeout seconds

Number of seconds that the switch waits for the retransmission of packets by the switch to the authentication server. The range is 1 to 65535.

supp-timeout seconds

Number of seconds that the switch waits for the retransmission of packets by the switch to the client. The range is 1 to 65535.

tx-period seconds

Number of seconds that the switch waits for a response to an EAP-request/identity frame from the client before retransmitting the request. The range is 1 to 65535.


Defaults

These are the defaults:

quiet-period is 60 seconds.

reauth-period is 3600 seconds.

server-timeout is 30 seconds.

supp-timeout is 30 seconds.

tx-period is 30 seconds.

Command Modes

Interface configuration

Command History

Release
Modification

12.1(8)EA1

This command was first introduced.

12.1(14)EA1

The supp-timeout and server-timeout keywords were added, and the command was changed to the interface configuration mode.


Usage Guidelines

You should change the default values only to adjust for unusual circumstances such as unreliable links or specific behavioral problems with certain clients and authentication servers.

The dot1x timeout reauth-period interface configuration command affects the behavior of the switch only if you have enabled periodic re-authentication by using the dot1x reauthentication interface configuration command.

During the quiet period, the switch does not accept or initiate any authentication requests. If you want to provide a faster response time to the user, enter a smaller number than the default.

Examples

This example shows how to enable periodic re-authentication and to set the number of seconds between re-authentication attempts to 4000 seconds:

Switch(config-if)# dot1x reauthentication
Switch(config-if)# dot1x timeout reauth-period 4000

This example shows how to set the quiet time on the switch to 30 seconds:

Switch(config-if)# dot1x timeout quiet-period 30

This example shows how to set 60 as the number of seconds to wait for a response to an EAP-request/identity frame from the client before re-transmitting the request:

Switch(config-if)# dot1x timeout tx-period 60

This example shows how to set the switch-to-client retransmission time for the EAP request frame to 25 seconds:

Switch(config-if)# dot1x timeout supp-timeout 25

This example shows how to set the switch-to-authentication server retransmission time to 25 seconds:

Switch(config)# dot1x timeout server-timeout 25

This example shows how to return to the default re-authorization period:

Switch(config-if)# no dot1x timeout reauth-period

You can verify your settings by entering the show dot1x [interface interface-id] privileged EXEC command.

Related Commands

Command
Description

dot1x max-req

Sets the maximum number of times that the switch sends an EAP-request/identity frame before restarting the authentication process.

dot1x reauthentication

Enables periodic re-authentication of the client.

show dot1x [interface interface-id]

Displays 802.1X status for the specified interface.


duplex

Use the duplex interface configuration command to specify the duplex mode of operation for Fast Ethernet and Gigabit Ethernet ports. Use the no form of this command to return the port to its default value.

duplex {auto | full | half}

no duplex


Note This command is not available on Gigabit Interface Converter (GBIC) ports. The default duplex on GBIC ports is autonegotiation.


Syntax Description

auto

Port automatically detects whether it should run in full- or half-duplex mode.

full

Port is in full-duplex mode.

half

Port is in half-duplex mode.


Defaults

The default is auto.

Command Modes

Interface configuration

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.


Usage Guidelines

Certain ports can be configured to be either full duplex or half duplex. Applicability of this command depends on the device to which the switch is attached.

For Fast Ethernet ports, setting the port to auto has the same effect as specifying half if the attached device does not autonegotiate the duplex parameter.

For Gigabit Ethernet ports, setting the port to auto has the same effect as specifying full if the attached device does not autonegotiate the duplex parameter.

You cannot configure duplex mode on GBIC interfaces.

If both ends of the line support autonegotiation, we highly recommend using 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 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 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 reenable the interface during the reconfiguration.


Note For guidelines on setting the switch speed and duplex parameters, refer to the software configuration guide for this release.


Examples

This example shows how to configure an interface for full duplex operation:

Switch(config)# interface gigabitethernet0/1
Switch(config-if)# duplex full

You can verify your setting by entering the show interfaces privileged EXEC command.

Related Commands

Command
Description

show interfaces

Displays the interface settings on the switch.

speed

Sets the speed on a 10/100/1000 Mbps interface.


errdisable detect cause

Use the errdisable detect cause global configuration command to enable error disable detection for a specific cause or all causes. Use the no form of this command to disable the error disable detection feature.

errdisable detect cause {all | dhcp-rate-limit | dtp-flap | gbic-invalid | l2ptguard | link-flap | loopback | pagp-flap}

no errdisable detect cause {all | dhcp-rate-limit | dtp-flap | gbic-invalid | l2ptguard | link-flap | loopback | pagp-flap}

Syntax Description

all

Enable error detection for all error-disable states.

dhcp-rate-limit

Enable error detection for the Dynamic Host Configuration Protocol (DHCP) rate limit cause.

dtp-flap

Enable error detection for the Dynamic Trunking Protocol (DTP) flap error-disable cause.

gbic-invalid

Enable error detection for an invalid GBIC error-disable cause.

l2ptguard

Enable error detection for a Layer 2 protocol-tunnel error-disable cause.

link-flap

Enable error detection for the link flap error-disable cause.

loopback

Enable error detection for detected loopbacks.

pagp-flap

Enable error detection for the Port Aggregation Protocol (PAgP) flap-error disable cause.


Defaults

Detection is enabled for all causes.

Command Modes

Global configuration

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.

12.1(8)EA1

The bpduguard, rootguard, and udld keywords were removed.

12.1(9)EA1

The l2ptguard and gbic-invalid keywords were added.

12.1(19)EA1

The dhcp-rate-limit and loopback keywords were added.


Usage Guidelines

A cause (dhcp-rate-limit, dtp-flap, gbic-invalid, l2ptguard, link-flap, loopback, and pagp-flap) is defined as the reason why the error-disabled state occurred. When a cause is detected on an interface, the interface is placed in error-disabled state, an operational state similar to link-down state.

If you set a recovery mechanism for the cause by entering the errdisable recovery global configuration command for the cause, the interface is brought out of the error-disabled state and allowed to retry the operation when all causes have timed out. If you do not set a recovery mechanism, you must enter the shutdown and then the no shutdown commands to manually recover an interface from the error-disabled state.

Examples

This example shows how to enable error disable detection for the link-flap error-disable cause:

Switch(config)# errdisable detect cause link-flap

You can verify your setting by entering the show errdisable detect privileged EXEC command.

Related Commands

Command
Description

show errdisable detect

Displays errdisable detection information.

show interfaces status err-disabled

Displays interface status or a list of interfaces in the error-disabled state.


errdisable recovery

Use the errdisable recovery global configuration command to configure the recover mechanism variables. Use the no form of this command to return to the default setting.

errdisable recovery {cause {all | bpduguard | channel-misconfig | dhcp-rate-limit | dtp-flap | gbic-invalid | l2ptguard | link-flap | loopback | pagp-flap | psecure-violation | security-violation | udld | vmps}} | {interval interval}

no errdisable recovery {cause {all | bpduguard | channel-misconfig | dhcp-rate-limit | dtp-flap | gbic-invalid | l2ptguard | link-flap | loopback | pagp-flap | psecure-violation | security-violation | udld | vmps}} | {interval interval}

Syntax Description

cause

Enable error disable to recover from a specific cause.

all

Enable the timer to recover from all error-disable causes.

bpduguard

Enable the timer to recover from the bridge protocol data unit (BPDU) guard error-disable state.

channel-misconfig

Enable the timer to recover from the EtherChannel misconfiguration error-disable state.

dhcp-rate-limit

Enable the timer to recover from the Dynamic Host Configuration Protocol (DHCP) error-disable state.

dtp-flap

Enable the timer to recover from the Dynamic Trunking Protocol (DTP) flap error-disable state.

gbic-invalid

Enable the timer to recover from an invalid GBIC error-disable state.

l2ptguard

Enable the timer to recover from a Layer 2 protocol tunnel error-disable state.

link-flap

Enable the timer to recover from the link-flap error-disable state.

loopback

Enable the timer to recover from a loopback error-disable state.

pagp-flap

Enable the timer to recover from the Port Aggregation Protocol (PAgP)-flap error-disable state.

psecure-violation

Enable the timer to recover from a port security violation disable state.

security-violation

Enable the timer to recover from an 802.1X violation disable state

udld

Enable the timer to recover from the UniDirectional Link Detection (UDLD) error-disable state.

vmps

Enable the timer to recover from the VLAN Membership Policy Server (VMPS) error-disable state.

interval interval

Specify the time to recover from the specified error-disable state. The range is 30 to 86400 seconds. The same interval is applied to all causes. The default interval is 300 seconds.

Note The errdisable recovery timer is initialized at a random differential from the configured interval value. The difference between the actual timeout value and the configured value can be up to 15 percent of the configured interval.


Defaults

Recovery is disabled for all causes.

The default recovery interval is 300 seconds.

Command Modes

Global configuration

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.

12.1(8)EA1

The rootguard keyword was deleted.

12.1(9)EA1

The gbic-invalid, l2ptguard, and psecure-violation keywords were added.

12.1(13)EA1

The channel-misconfig keyword was added.

12.1(19)EA1

The dhcp-rate-limit, loopback, security-violation, and vmps keywords were added.


Usage Guidelines

A cause (bpduguard, dhcp-rate-limit, dtp-flap, gbic-invalid, l2ptguard, link-flap, loopback, pagp-flap, psecure-violation, security-violation, udld, vmps) is defined as the reason why the error-disabled state occurred. When a cause is detected on an interface, the interface is placed in error-disabled state, an operational state similar to link-down state. If you do not enable errdisable recovery for the cause, the interface stays in error-disabled state until you enter a shutdown and no shutdown interface configuration command. If you enable the recovery for a cause, the interface is brought out of the error-disabled state and allowed to retry the operation again when all the causes have timed out.

Otherwise, you must enter the shutdown then no shutdown commands to manually recover an interface from the error-disabled state.

Examples

This example shows how to enable the recovery timer for the BPDU guard error-disable cause:

Switch(config)# errdisable recovery cause bpduguard

This example shows how to set the timer to 500 seconds:

Switch(config)# errdisable recovery interval 500

You can verify your settings by entering the show errdisable recovery privileged EXEC command.

Related Commands

Command
Description

show errdisable recovery

Displays errdisable recovery timer information.

show interfaces status err-disabled

Displays interface status or a list of interfaces in error-disabled state.


flowcontrol

Use the flowcontrol interface configuration command to set the receive or send flow-control value for an interface. When flow control send is on for a device and it detects any congestion at its end, it notifies the link partner or the remote device of the congestion by sending a pause frame. When flow control receive is on for the remote device and it receives a pause frame, it stops sending any data packets. This prevents any loss of data packets during the congestion period.

Use the receive off and send off keywords to disable flow control.

flowcontrol {receive | send} {desired | off | on}


Note On Catalyst 3550 switches, Gigabit Ethernet ports can receive and send pause frames; Fast Ethernet ports can receive only pause frames. Therefore, for 10/100 ports, the send keyword is not available.


Syntax Description

receive

Set whether the interface can receive flow-control packets from a remote device.

send

Set whether the interface can send flow-control packets to a remote device. This keyword is not available for 10/100 Mbps interfaces.

desired

When used with receive, allows an interface to operate with an attached device that is required to send flow-control packets or with an attached device that is not required to but can send flow-control packets.
When used with send, the interface sends flow-control packets to a remote device if the remote device supports it.

off

When used with receive, turns off an attached device's ability to send flow-control packets to an interface. When used with send, turns off the local port's ability to send flow-control packets to a remote device.

on

When used with receive, allows an interface to operate with an attached device that is required to send flow-control packets or with an attached device that is not required to but can send flow-control packets.
When used with send, the interface sends flow-control packets to a remote device if the remote device supports it.


Defaults

The defaults for Gigabit Ethernet interfaces are flowcontrol receive off and flowcontrol send desired. The defaults for Fast Ethernet interfaces are flowcontrol receive off and flowcontrol send off.

Command Modes

Interface configuration

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.


Usage Guidelines

You must not configure both IEEE 802.3X flowcontrol and quality of service (QoS) on a switch. Before configuring flowcontrol on an interface, use the no mls qos global configuration command to disable QoS on the switch.

Note that when used with receive, the on and desired keywords have the same result.


Note On Catalyst 3550 switches, 10/100/1000 Mbps and GBIC ports and can receive and send pause frames; 10/100 Mbps ports can receive only pause frames. Therefore, for 10/100 ports, the conditions described in the next paragraphs are always send off.


When you use the flowcontrol command to set a port to control traffic rates during congestion, you are setting flow control on a port to one of these conditions:

receive on and send on: Flow control operates in both directions; pause frames can be sent by both the local device and the remote device to show link congestion.

receive on and send desired: The port can receive pause frames and is able to send pause frames if the attached device supports it.

receive on and send off: The port cannot send out pause frames, but can operate with an attached device that is required to or is able to send pause frames; the port is able to receive pause frames.

receive off and send on: The port sends pause frames if the remote device supports it, but cannot receive pause frames from the remote device.

receive off and send desired: The port cannot receive pause frames, but can send pause frames if the attached device supports it.

receive off and send off: Flow control does not operate in either direction. In case of congestion, no indication is given to the link partner and no pause frames are sent or received by either device.

Table 2-4 shows the flow control results on local and remote ports for a combination of settings. The table assumes that receive desired has the same results as using the receive on keywords. Because 10/100 Mbps ports cannot send pause frames, only the last two rows (send off) apply to these ports.

Table 2-4 Flow Control Settings and Local and Remote Port Flow Control Resolution 

Flow Control Settings
Flow Control Resolution
Local Device
Remote Device
Local Device
Remote Device

send on/receive on

send on/receive on

send on/receive off

send desired/receive on

send desired/receive off

send off/receive on

send off/receive off

Sends and receives

Does not send or receive

Sends and receives

Does not send or receive

Sends and receives

Does not send or receive

Sends and receives

Does not send or receive

Sends and receives

Does not send or receive

Receives only

Does not send or receive

send on/receive off

send on/receive on

send on/receive off

send desired/receive on

send desired/receive off

send off/receive on

send off/receive off

Does not send or receive

Does not send or receive

Sends only

Does not send or receive

Sends only

Does not send or receive

Does not send or receive

Does not send or receive

Receives only

Does not send or receive

Receives only

Does not send or receive

send desired/receive on

send on/receive on

send on/receive off

send desired/receive on

send desired/receive off

send off/receive on

send off/receive off

Sends and receives

Receives only

Sends and receives

Receives only

Sends and receives

Does not send or receive

Sends and receives

Sends only

Sends and receives

Sends only

Receives only

Does not send or receive

send desired/receive off

send on/receive on

send on/receive off

send desired/receive on

send desired/receive off

send off/receive on

send off/receive off

Does not send or receive

Does not send or receive

Sends only

Does not send or receive

Sends only

Does not send or receive

Does not send or receive

Does not send or receive

Receives only

Does not send or receive

Receives only

Does not send or receive

send off/receive on

send on/receive on

send on/receive off

send desired/receive on

send desired/receive off

send off/receive on

send off/receive off

Receives only

Receives only

Receives only

Receives only

Receives only

Does not send or receive

Sends and receives

Sends only

Sends and receives

Sends only

Receives only

Does not send or receive

send off/receive off

send on/receive on

send on/receive off

send desired/receive on

send desired/receive off

send off/receive on

send off/receive off

Does not send or receive

Does not send or receive

Does not send or receive

Does not send or receive

Does not send or receive

Does not send or receive

Does not send or receive

Does not send or receive

Does not send or receive

Does not send or receive

Does not send or receive

Does not send or receive


Examples

This example shows how to configure the local port to not support any level of flow control by the remote port:

Switch(config-if)# flowcontrol receive off
Switch(config-if)# flowcontrol send off

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

Related Commands

Command
Description

show interfaces

Displays the interface settings on the switch, including input and output flow control.


interface port-channel

Use the interface port-channel global configuration command to access or create the port-channel logical interface for Layer 3 routed interfaces. Use the no form of this command to remove the port-channel.

interface port-channel port-channel-number

no interface port-channel port-channel-number

Syntax Description

port-channel-number

Port-channel number. The range is 1 to 64.


Defaults

No port-channel logical interfaces are defined.

Command Modes

Global configuration

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.


Usage Guidelines

For Layer 2 EtherChannels, you must configure the channel-group interface configuration command, which automatically creates the port-channel logical interface. You cannot put Layer 2 interfaces into a manually created port-channel interface.

You create Layer 3 port channels by using the interface port-channel command. You must manually configure the port-channel logical interface before putting the interface into the channel group.

Only one port channel in a channel group is allowed.


Caution When using a port-channel interface as a routed interface, do not assign Layer 3 addresses on the physical interfaces that are assigned to the channel group.


Caution Do not assign bridge groups on the physical interfaces in a channel group used as a Layer 3 port-channel interface because it creates loops. You must also disable spanning tree.

Follow these guidelines when you use the interface port-channel command:

If you configure Inter-Switch Link (ISL), you must assign the IP address to the switch virtual interface (SVI).

If you want to use the CDP, you must configure it only on the physical interface and not on the port-channel interface.

If you do not assign a static MAC address on the port-channel interface, a MAC address is automatically assigned. If you assign a static MAC address and then later remove it, the MAC address is automatically assigned.

Before enabling 802.1X on a port, you must first remove it from the EtherChannel. If you try to enable 802.1X on an EtherChannel or on an active port in an EtherChannel, an error message appears, and 802.1X is not enabled.

Examples

This example shows how to create a port-channel interface with a port channel number of 5:

Switch(config)# interface port-channel 5

You can verify your setting by entering the show running-config privileged EXEC or show etherchannel channel-group-number detail privileged EXEC command.

Related Commands

Command
Description

channel-group

Assigns an Ethernet interface to an EtherChannel group.

show etherchannel

Displays EtherChannel information for a channel.

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.


interface range

Use the interface range global configuration command to enter interface range configuration mode and to execute a command on multiple ports at the same time. Use the no form of this command to remove an interface range.

interface range {port-range | macro name}

no interface range {port-range | macro name}

Syntax Description

port-range

Port range. For a list of valid values for port-range, see the "Usage Guidelines" section.

macro name

Specify the name of a macro.


Defaults

This command has no default setting.

Command Modes

Global configuration

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.


Usage Guidelines

When you enter interface range configuration mode, all interface parameters you enter are attributed to all interfaces within the range.

For VLANs, you can use the interface range command only on existing VLAN switch virtual interfaces (SVIs). To display VLAN SVIs, enter the show running-config privileged EXEC command. VLANs not displayed cannot be used in the interface range command. The commands entered under interface range command are applied to all existing VLAN SVIs in the range.

All configuration changes made to an interface range are saved to nonvolatile RAM (NVRAM), but the interface range itself is not saved to NVRAM.

You can enter the interface range in two ways:

Specifying up to five interface ranges

Specifying a previously defined interface-range macro

You can define up to five interface ranges with a single command, with each range separated by a comma.

All interfaces in a range must be the same type; that is, all Fast Ethernet ports, all Gigabit Ethernet ports, all EtherChannel ports, or all VLANs.

Valid values for port-range type and interface:

vlan vlan-id, where vlan-id is from 1 to 4094; do not enter leading zeros

port-channel port-channel-number, where port-channel-number is from 1 to 64

fastethernet interface-id

gigabitethernet interface-id

For physical interfaces, the interface-id is defined as a slot/number (where slot is always 0 for the Catalyst 3550 switch), and you can enter the range in one of these ways:

type 0/number - number (for example, gigabitethernet0/1 -2)

type 0/number - 0/number (for example, gigabitethernet0/1 - 0/2)

When you define a range, you must enter a space between the first entry and the hyphen (-):

interface range gigabitethernet0/1 -2, gigabitethernet0/4 -5

When you define multiple ranges, you must enter a space before and after the comma (,):

interface range fastethernet0/3 - 7 , gigabitethernet0/1 - 2

You cannot specify both a macro and an interface range in the same command.

A single interface can also be specified in port-range (this would make the command similar to the interface interface-id global configuration command).


Note For more information about configuring interface ranges, refer to the software configuration guide for this release.


Examples

This example shows how to use the interface range command to enter interface range configuration mode to apply commands to two ports:

Switch(config)# interface range gigabitethernet0/1 - 2
Switch(config-if-range)#

This example shows how to use a port-range macro macro1 for the same function. The advantage is that you can reuse macro1 until you delete it.

Switch(config)# define interface-range macro1 gigabitethernet0/1 - 2
Switch(config)# interface range macro macro1
Switch(config-if-range)#

Related Commands

Command
Description

define interface-range

Creates an interface range macro.

show running-config

Displays the configuration information currently running 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.


interface vlan

Use the interface vlan global configuration command to create or access a dynamic switch virtual interface (SVI) and to enter interface configuration mode. Use the no form of this command to delete an SVI.

interface vlan vlan-id

no interface vlan vlan-id

Syntax Description

vlan-id

VLAN number from 1 to 4094; do not enter leading zeros.


Defaults

The default VLAN interface is VLAN 1.

Command Modes

Global configuration

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.


Usage Guidelines

You cannot delete the VLAN 1 interface.

SVIs are created the first time you enter the interface vlan vlan-id command for a particular vlan. The vlan-id corresponds to the VLAN-tag associated with data frames on an ISL or 802.1Q encapsulated trunk or the VLAN ID configured for an access port.


Note When you create an SVI, it does not become active until it is associated with a physical port.


If you delete an SVI by entering the no interface vlan vlan-id command, the deleted interface is no longer visible in the output from the show interfaces privileged EXEC command.

You can reinstate a deleted SVI by entering the interface vlan vlan-id command for the deleted interface. The interface comes back up, but much of the previous configuration will be gone.

The number of routed ports and SVIs that you can configure is not limited by software; however, the interrelationship between this number and the number of other features being configured might have an impact on CPU utilization due to hardware limitations. You can use the sdm prefer global configuration command to reallocate system hardware resources based on templates and feature tables. For the Catalyst 3550 Gigabit Ethernet switches, the tables are based on 16 routed interfaces (SVIs and routed ports. For switches with mainly Fast Ethernet ports, the tables are based on 8 routed interfaces. For more information, see the sdm prefer command.

Examples

This example shows how to create a new SVI with VLAN ID 23 and enter interface configuration mode:

Switch(config)# interface vlan 23
Switch(config-if)#

You can verify your setting by entering the show interfaces and show interfaces vlan vlan-id privileged EXEC commands.

Related Commands

Command
Description

show interfaces vlan vlan-id

Displays the administrative and operational status of all interfaces or the specified VLAN.


ip access-group

Use the ip access-group interface configuration command to control access to a Layer 2 or Layer 3 interface. Use the no form of this command to remove all access groups or the specified access group from the interface.

ip access-group {access-list-number | name} {in | out}

no ip access-group [access-list-number | name] {in | out}

Syntax Description

access-list-number

The number of the IP access control list (ACL), from 1 to 199 or from 1300 to 2699.

name

The name of an IP ACL, specified in the ip access-list global configuration command.

in

Specify filtering on inbound packets.

out

Specify filtering on outbound packets. This keyword is valid only on Layer 3 interfaces.


Defaults

No access list is applied to the interface.

Command Modes

Interface configuration

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.


Usage Guidelines

You can apply named or numbered standard or extended access lists to an interface. To define an access list by name, use the ip access-list global configuration command. To define a numbered access list, use the access list global configuration command. You can used numbered standard access lists ranging from 1 to 99 and 1300 to 1999 or extended access lists ranging from 100 to 199 and 2000 to 2699.

You can use this command to apply an access list to a Layer 2 or Layer 3 interface. However, note these limitations for Layer 2 interfaces (port ACLs):

You can only apply ACLs in the inbound direction; the out keyword is not supported for Layer 2 interfaces.

You can only apply one IP ACL and one MAC ACL per interface.

Layer 2 interfaces do not support logging; if the log keyword is specified in the IP ACL, it is ignored.

An IP ACL applied to a Layer 2 interface only filters IP packets. To filter non-IP packets, use the mac access-group interface configuration command with MAC extended ACLs.

You can apply IP ACLs to both outbound or inbound Layer 3 interfaces.

A Layer 2 interface can have only one IP ACL applied (in the inbound direction). A Layer 3 interface can have one IP ACL applied in each direction.

You cannot apply an IP ACL to a Layer 3 interface on a switch that has a Layer 2 interface with an applied IP ACL or MAC ACL, and you cannot apply a VLAN map to any of the switch VLANs.

You cannot apply an IP ACL or MAC ACL to a Layer 2 interface on a switch that has an input Layer 3 ACL or a VLAN map applied to it.

For standard inbound access lists, after the switch receives a packet, it checks the source address of the packet against the access list. IP extended access lists can optionally check other fields in the packet, such as the destination IP address, protocol type, or port numbers. If the access list permits the packet, the switch continues to process the packet. If the access list denies the packet, the switch discards the packet. If the access list has been applied to a Layer 3 interface, discarding a packet (by default) causes the generation of an Internet Control Message Protocol (ICMP) Host Unreachable message. ICMP Host Unreachable messages are not generated for packets discarded on a Layer 2 interface.

For standard outbound access lists, after receiving a packet and sending it to a controlled interface, the switch checks the packet against the access list. If the access list permits the packet, the switch sends the packet. If the access list denies the packet, the switch discards the packet and, by default, generates an ICMP Host Unreachable message.

If the specified access list does not exist, all packets are passed.

Examples

This example shows how to apply IP access list 101 to inbound packets on Fast Ethernet interface 1:

Switch(config)# interface fastethernet0/1
Switch(config-if)# ip access-group 101 in

You can verify your settings by entering the show ip interface, show access-lists, or show ip access-lists privileged EXEC command.

Related Commands

Command
Description

access list

Configures a numbered ACL. 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 ACL. For syntax information, select Cisco IOS IP and IP Routing Command Reference for IOS Release 12.1 > IP Addressing and Services > IP Services Commands.

show access-lists

Displays ACLs configured on the switch.

show ip access-lists

Displays IP ACLs configured 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.

show ip interface

Displays information about interface status and configuration. For syntax information, select Cisco IOS IP and IP Routing Command Reference for IOS Release 12.1 > IP Addressing and Services > IP Addressing Commands.


ip address

Use the ip address interface configuration command to set an IP address for the Layer 2 switch or an IP address for each switch virtual interface (SVI) or routed port on the Layer 3 switch. Use the no form of this command to remove an IP address or to disable IP processing.

ip address ip-address subnet-mask [secondary]

no ip address [ip-address subnet-mask] [secondary]

Syntax Description

ip-address

IP address.

subnet-mask

Mask for the associated IP subnet.

secondary

(Optional) Specifies that the configured address is a secondary IP address. If this keyword is omitted, the configured address is the primary IP address.


Defaults

No IP address is defined.

Command Modes

Interface configuration

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.


Usage Guidelines

If you remove the switch IP address through a Telnet session, your connection to the switch is lost.

Hosts can determine subnet masks by sending an Internet Control Message Protocol (ICMP) Mask Request message. Routers respond to this request with an ICMP Mask Reply message.

You can disable IP processing on a particular interface by removing its IP address with the no ip address command. If the switch detects another host using one of its IP addresses, it sends an error message to the console.

You can use the optional keyword secondary to specify an unlimited number of secondary addresses. Secondary addresses are treated like primary addresses, except the system never generates datagrams other than routing updates with secondary source addresses. IP broadcasts and ARP requests are handled properly, as are interface routes in the IP routing table.


Note If any router on a network segment uses a secondary address, all other devices on that same segment must also use a secondary address from the same network or subnet. Inconsistent use of secondary addresses on a network segment can very quickly cause routing loops.


When you are routing Open Shortest Path First (OSPF), ensure that all secondary addresses of an interface fall into the same OSPF area as the primary addresses.

If your switch receives its IP address from a Bootstrap Protocol (BOOTP) or Dynamic Host Configuration Protocol (DHCP) server and you remove the switch IP address by using the no ip address command, IP processing is disabled, and the BOOTP or DHCP server cannot reassign the address.

A Layer 3 switch can have an IP address assigned to each routed port and SVI. The number of routed ports and SVIs that you can configure is not limited by software; however, the interrelationship between this number and the number of other features being configured might have an impact on CPU utilization due to hardware limitations. You can use the sdm prefer global configuration command to reallocate system hardware resources based on templates and feature tables. For the Catalyst 3550 Gigabit Ethernet switches, the tables are based on 16 routed interfaces (SVIs and routed ports. For switches with mainly Fast Ethernet ports, the tables are based on 8 routed interfaces. For more information, see the sdm prefer command.

Examples

This example shows how to configure the IP address for the Layer 2 switch on a subnetted network:

Switch(config)# interface vlan 1
Switch(config-if)# ip address 172.20.128.2 255.255.255.0 

This example shows how to configure the IP address for a port on the Layer 3 switch:

Switch(config)# ip multicast-routing
Switch(config)# interface gigabitethernet0/1
Switch(config-if)# no switchport
Switch(config-if)# ip address 172.20.128.2 255.255.255.0

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.


ip dhcp snooping

Use the ip dhcp snooping global configuration command to enable Dynamic Host Configuration Protocol (DHCP) snooping globally. Use the no form of this command to return to the default setting.

ip dhcp snooping

no ip dhcp snooping

Syntax Description

This command has no arguments or keywords.

Defaults

DHCP snooping is disabled.

Command Modes

Global configuration

Command History

Release
Modification

12.1(19)EA1

This command was first introduced.


Usage Guidelines

You must globally enable DHCP snooping for any DHCP snooping configuration to take effect.

DHCP snooping is not active until snooping is enabled on a VLAN by using the ip dhcp snooping VLAN vlan-id global configuration command.

In Cisco IOS Release 12.1(19)EA1, the implementation for the option-82 subscriber identification changed from the previous release. The new option-82 format uses a different circuit ID and remote ID suboption, vlan-mod-port. The previous version uses the snmp-ifindex circuit ID and remote ID suboption.

If you have option 82 configured on the switch and you upgrade to Cisco IOS Release 12.1(19)EA1 or later, the option-82 configuration is not affected. However, when you enable DHCP snooping globally on the switch by using the ip dhcp snooping global configuration command, the previous option-82 configuration is suspended, and the new option-82 format is applied. When you disable DHCP snooping on the switch, the previous option-82 configuration is re-enabled.

To provide for backward compatibility, you can select the previous option-82 format by using the ip dhcp snooping information option format snmp-ifindex global configuration command when you enable DHCP snooping. When DHCP snooping is enabled globally, option-82 information (in the selected format) is inserted only on snooped VLANs.

To use the previous version of option 82 without enabling DHCP snooping, see the software configuration guide for more information.

Examples

This example shows how to enable DHCP snooping:

Switch(config)# ip dhcp snooping

You can verify your settings by entering the show ip dhcp snooping privileged EXEC command.

Related Commands

Command
Description

ip dhcp snooping vlan

Enables DHCP snooping on a VLAN.

show ip dhcp snooping

Displays the DHCP snooping configuration.

show ip dhcp snooping binding

Displays the DHCP snooping binding information.


ip dhcp snooping information option

Use the ip dhcp snooping information option global configuration command to enable Dynamic Host Configuration Protocol (DHCP) option-82 data insertion. Use the no form of this command to disable DHCP option-82 data insertion.

ip dhcp snooping information option

no ip dhcp snooping information option

Syntax Description

This command has no arguments or keywords.

Defaults

DHCP option-82 data insertion is enabled.

Command Modes

Global configuration

Command History

Release
Modification

12.1(19)EA1

This command was first introduced.


Usage Guidelines

You must globally enable DHCP snooping by using the ip dhcp snooping global configuration command for any DHCP snooping configuration to take effect.

When the option-82 feature is enabled and a switch receives a DHCP request from a host, it adds the option-82 information in the packet. The option-82 information contains the switch MAC address (the remote ID suboption) and the port identifier, vlan-mod-port or snmp-ifindex, from which the packet is received (circuit ID suboption). The switch forwards the DHCP request that includes the option-82 field to the DHCP server.

When the DHCP server receives the packet, it can use the remote ID, the circuit ID, or both to assign IP addresses and implement policies, such as restricting the number of IP addresses that can be assigned to a single remote ID or a circuit ID. Then the DHCP server echoes the option-82 field in the DHCP reply.

The DHCP server unicasts the reply to the switch if the request was relayed to the server by the switch. When the client and server are on the same subnet, the server broadcasts the reply. The switch inspects the remote ID and possibly the circuit ID fields to verify that it originally inserted the option-82 data. The switch removes the option-82 field and forwards the packet to the switch port that connects to the DHCP host that sent the DHCP request.

In Cisco IOS Release 12.1(19)EA1, the implementation for the option-82 subscriber identification changed from the previous release. The new option-82 format uses a different circuit ID and remote ID suboption, vlan-mod-port. The previous version uses the snmp-ifindex circuit ID and remote ID suboption.

You can select the previous option-82 format by using the ip dhcp snooping information option format snmp-ifindex global configuration command. When DHCP snooping is enabled globally, option-82 information (in the selected format) is only inserted on snooped VLANs.

Examples

This example shows how to enable DHCP option-82 data insertion:

Switch(config)# ip dhcp snooping information option

You can verify your settings by entering the show ip dhcp snooping privileged EXEC command.

Related Commands

Command
Description

show ip dhcp snooping

Displays the DHCP snooping configuration.

show ip dhcp snooping binding

Displays the DHCP snooping binding information.


ip dhcp snooping information option format snmp-ifindex

Use the ip dhcp snooping information option format snmp-ifindex global configuration command to select the snmp-ifindex alternative option-82 data format. Use the no form of this command to use the vlan-mod-port option-82 data format.

ip dhcp snooping information option format snmp-ifindex

no ip dhcp snooping information option format snmp-ifindex

Syntax Description

This command has no arguments or keywords.

Defaults

DHCP option-82 data insertion uses the vlan-mod-port format.

Command Modes

Global configuration

Command History

Release
Modification

12.1(19)EA1

This command was first introduced.


Usage Guidelines

If you have option 82 configured on the switch and you upgrade to Cisco IOS Release 12.1(19)EA1 or later, the option 82 configuration is not affected. However, when you enable Dynamic Host Configuration Protocol (DHCP) snooping globally on the switch by using the ip dhcp snooping global configuration command, the relay agent information option configuration is disabled. This happens regardless of whether snooping is enabled on any VLANs. To provide for backward compatibility when using option 82 with DHCP snooping, you can select the previous option-82 format by using the ip dhcp snooping information option format snmp-ifindex global configuration command.

You can configure some switches in the network to continue using the previous option 82 format, and configure DHCP snooping on other switches in the network.

Option-82 information is only inserted on snooped VLANs.

Examples

This example shows how to enable DHCP option 82 data insertion in the snmp-ifindex format:

Switch(config)# ip dhcp snooping information option format snmp-ifindex

You can verify your settings by entering the show ip dhcp snooping privileged EXEC command.

Related Commands

Command
Description

show ip dhcp snooping

Displays the DHCP snooping configuration.

show ip dhcp snooping binding

Displays the DHCP snooping binding information.


ip dhcp snooping limit rate

Use the ip dhcp snooping limit rate interface configuration command to configure the number of Dynamic Host Configuration Protocol (DHCP) messages an interface can receive per second. Use the no form of this command to return to the default setting.

ip dhcp snooping limit rate rate

no ip dhcp snooping limit rate

Syntax Description

rate

Number of DHCP messages an interface can receive per second. The range is
1 to 4294967294.


Defaults

DHCP snooping rate limiting is disabled.

Command Modes

Interface configuration

Command History

Release
Modification

12.1(19)EA1

This command was first introduced.


Usage Guidelines

Normally, the rate limit applies to untrusted interfaces. If you want to configure rate limiting for trusted interfaces, keep in mind that trusted interfaces might aggregate DHCP traffic on multiple VLANs (some of which might not be snooped) in the switch, and you will need to adjust the interface rate limits to a higher value.

If the rate limit is exceeded, the interface is error-disabled. If you enabled error recovery by entering the errdisable recovery dhcp-rate-limit global configuration command, the interface retries the operation again when all the causes have timed out. If the error-recovery mechanism is not enabled, the interface stays in the error-disabled state until you enter the shutdown and no shutdown interface configuration commands.

Examples

This example shows how to set a message rate limit of 150 messages per second on an interface:

Switch(config-if)# ip dhcp snooping limit rate 150

You can verify your settings by entering the show ip dhcp snooping privileged EXEC command.

Related Commands

Command
Description

errdisable recovery

Configures the recover mechanism.

show ip dhcp snooping

Displays the DHCP snooping configuration.

show ip dhcp snooping binding

Displays the DHCP snooping binding information.


ip dhcp snooping trust

Use the ip dhcp snooping trust interface configuration command to configure a port as trusted for Dynamic Host Configuration Protocol (DHCP) snooping purposes. Use the no form of this command to return to the default setting.

ip dhcp snooping trust

no ip dhcp snooping trust

Syntax Description

This command has no arguments or keywords.

Defaults

DHCP snooping trust is disabled.

Command Modes

Interface configuration

Command History

Release
Modification

12.1(19)EA1

This command was first introduced.


Usage Guidelines

Configure as trusted ports that are connected to a DHCP server or to other switches or routers. Configure as untrusted ports that are connected to DHCP clients.

Examples

This example shows how to enable DHCP snooping trust on a port:

Switch(config-if)# ip dhcp snooping trust

You can verify your settings by entering the show ip dhcp snooping privileged EXEC command.

Related Commands

Command
Description

show ip dhcp snooping

Displays the DHCP snooping configuration.

show ip dhcp snooping binding

Displays the DHCP snooping binding information.


ip dhcp snooping vlan

Use the ip dhcp snooping vlan global configuration command to enable Dynamic Host Configuration Protocol (DHCP) snooping on a VLAN. Use the no form of this command to disable DHCP snooping on a VLAN.

ip dhcp snooping vlan vlan-id [vlan-id]

no ip dhcp snooping vlan vlan-id [vlan-id]

Syntax Description

vlan vlan-id [vlan-id]

Specify a VLAN ID or range of VLANs on which to enable DHCP snooping. You can specify a single VLAN identified by VLAN ID number or a start and end VLAN ID separated by a space to specify a range of VLANs. The range is 1 to 4094.


Defaults

DHCP snooping is disabled on all VLANs.

Command Modes

Global configuration

Command History

Release
Modification

12.1(19)EA1

This command was first introduced.


Usage Guidelines

You must first globally enable DHCP snooping before enabling DHCP snooping on a VLAN.

Examples

This example shows how to enable DHCP snooping on VLAN 10:

Switch(config)# ip dhcp snooping vlan 10

You can verify your settings by entering the show ip dhcp snooping privileged EXEC command.

Related Commands

Command
Description

show ip dhcp snooping

Displays the DHCP snooping configuration.

show ip dhcp snooping binding

Displays the DHCP snooping binding information.


ip igmp filter

Use the ip igmp filter interface configuration command to control whether or not all hosts on a Layer 2 interface can join one or more IP multicast groups by applying an Internet Group Management Protocol (IGMP) profile to the interface. Use the no form of this command to remove the specified profile from the interface.

ip igmp filter profile number

no ip igmp filter

Syntax Description

profile number

The IGMP profile number to be applied. The range is from 1 to 4294967295.


Defaults

No IGMP filters are applied.

Command Modes

Interface configuration

Command History

Release
Modification

12.1(8)EA1

This command was first introduced.


Usage Guidelines

You can apply IGMP filters only to Layer 2 physical interfaces; you cannot apply IGMP filters to routed ports, switch virtual interfaces (SVIs), or ports that belong to an EtherChannel group.

An IGMP profile can be applied to one or more switch port interfaces, but one port can have only one profile applied to it.

Examples

This example shows how to apply IGMP profile 22 to an interface.

Switch(config)# interface fastethernet0/12
Switch(config-if)# ip igmp filter 22

You can verify your setting by using the show running-config privileged EXEC command and by specifying an interface.

Switch# show running-config interface fastethernet0/12
Building configuration...

Current configuration : 124 bytes
!
interface FastEthernet0/12
 no ip address
 shutdown
 snmp trap link-status
 ip igmp filter 22
end

Related Commands

Command
Description

ip igmp profile

Configures the specified IGMP profile number.

show ip igmp profile

Displays the characteristics of the specified IGMP profile.

show running-config interface interface-id

Displays the running configuration on the switch interface, the IGMP profile (if any) that is applied to an interface. For syntax information, select Cisco IOS Configuration Fundamentals Command Reference for Release 12.1 > Cisco IOS File Management Commands > Configuration File Commands.


ip igmp max-groups

Use the ip igmp max-groups interface configuration command to set the maximum number of Internet Group Management Protocol (IGMP) groups that a Layer 2 interface can join or to configure the IGMP throttling action when the maximum number of entries is in the forwarding table. Use the no form of this command to set the maximum back to the default, which is to have no maximum limit, or to return to the default throttling action, which is to drop the report.

ip igmp max-groups {number | action {deny | replace}}

no ip igmp max-groups {number | action}

Syntax Description

number

The maximum number of IGMP groups that an interface can join. The range is from 0 to 4294967294. The default is no limit.

action deny

When the maximum number of entries is in the IGMP snooping forwarding table, drop the next IGMP join report. This is the default action.

action replace

When the maximum number of entries is in the IGMP snooping forwarding table, remove an randomly-selected entry in the forwarding table and add an entry for the next IGMP group.


Defaults

The default maximum number of groups is no limit.

After the switch learns the maximum number of IGMP group entries on an interface, the default throttling action is to drop the next IGMP report that the interface receives and to not add an entry for the IGMP group to the interface.

Command Modes

Interface configuration

Command History

Release
Modification

12.1(8)EA1

This command was first introduced.

12.1(19)EA1

The action {deny | replace} keywords were added.


Usage Guidelines

You can use this command only on Layer 2 physical interfaces and on logical EtherChannel interfaces. You cannot set IGMP maximum groups or configure the IGMP throttling action for routed ports, switch virtual interfaces (SVIs), or ports that belong to an EtherChannel group.

Follow these guidelines when configuring the IGMP throttling action:

If you configure the throttling action as deny and set the maximum group limitation, the entries that were previously in the forwarding table are not removed but are aged out. After these entries are aged out and the maximum number of entries is in the forwarding table, the switch drops the next IGMP report received on the interface.

If you configure the throttling action as replace and set the maximum group limitation, the entries that were previously in the forwarding table are removed. When the maximum number of entries is in the forwarding table, the switch deletes a randomly-selected entry and adds an entry for the next IGMP report received on the interface.

When the maximum group limitation is set to the default (no maximum), entering the ip igmp max-groups {deny | replace} command has no effect.

Examples

This example shows how to limit to 25 the number of IGMP groups that an interface can join.

Switch(config)# interface fastethernet0/12
Switch(config-if)# ip igmp max-groups 25

This example shows how to configure the switch to delete a random IGMP group in the forwarding table and to add an entry for the IGMP group when the maximum number of entries is in the forwarding table:

Switch(config)# interface gigabitethernet0/1
Switch(config-if)# ip igmp max-groups action replace

You can verify your setting by using the show running-config privileged EXEC command and by specifying an interface.

Related Commands

Command
Description

show running-config interface interface-id

Displays the running configuration on the switch interface, including the maximum number of IGMP groups that an interface can join and the throttling action. For syntax information, select Cisco IOS Configuration Fundamentals Command Reference for Release 12.1 > Cisco IOS File Management Commands > Configuration File Commands.


ip igmp profile

Use the ip igmp profile global configuration command to create an Internet Group Management Protocol (IGMP) profile and enter igmp profile configuration mode. From this mode, you can specify the configuration of the IGMP profile to be used for filtering IGMP membership reports from a switchport. Use the no form of this command to delete the IGMP profile.

ip igmp profile profile number

no ip igmp profile profile number

Syntax Description

profile number

The IGMP profile number being configured. The range is from 1 to 4294967295.


Defaults

No IGMP profiles are defined. When configured, the default action for matching an IGMP profile is to deny matching addresses.

Command Modes

Global configuration

Command History

Release
Modification

12.1(8)EA1

This command was first introduced.


Usage Guidelines

When you are in IGMP profile configuration mode, you can create the profile by using these commands:

deny: specifies that matching addresses are denied; this is the default condition.

exit: exits from igmp-profile configuration mode.

no: negates a command or resets to its defaults.

permit: specifies that matching addresses are permitted.

range: specifies a range of IP addresses for the profile. This can be a single IP address or a range with a start and an end address.

When entering a range, enter the low IP multicast address, a space, and the high IP multicast address.

You can apply an IGMP profile to one or more Layer 2 interfaces, but each interface can have only one profile applied to it.

Examples

This example shows how to configure IGMP profile 40 that permits the specified range of IP multicast addresses.

Switch # config terminal
Switch(config)# ip igmp profile 40
Switch(config-igmp-profile)# permit
Switch(config-igmp-profile)# range 233.1.1.1 233.255.255.255

You can verify your settings by using the show ip igmp profile privileged EXEC command.

Related Commands

Command
Description

ip igmp filter

Applies the IGMP profile to the specified interface.

show ip igmp profile

Displays the characteristics of all IGMP profiles or the specified IGMP profile number.


ip igmp snooping

Use the ip igmp snooping global configuration command to globally enable Internet Group Management Protocol (IGMP) snooping on the switch or to enable it on the interface. Use the command with keywords to enable and configure IGMP snooping on a VLAN interface. Use the no form of this command to disable IGMP snooping or to reset the parameters to the default setting.

ip igmp snooping [vlan vlan-id [immediate-leave] | [mrouter {interface interface-id} | {learn {cgmp | pim-dvmrp}}] | [static {mac-address} {interface interface-id}]

no ip igmp snooping [vlan vlan-id [immediate-leave] | [mrouter {interface interface-id} | {learn {cgmp | pim-dvmrp}}] | [static {mac-address} {interface interface-id}]


Note For more information about IGMP snooping, refer to the software configuration guide for this release.


Syntax Description

vlan vlan-id

(Optional) When used with other keywords, enable IGMP snooping on a VLAN interface. Use the no form of this command to disable IGMP snooping on a VLAN interface.

The VLAN ID range is from 1 to 4094.

immediate-leave

(Optional) Enable IGMP immediate-leave processing on a VLAN interface. Use the no form of the command to disable the Immediate Leave feature on the interface.

mrouter

(Optional) Add a multicast router port and configure the multicast router learning method. The no form of the command removes the configuration.

interface interface-id

(Optional) With mrouter, specify the next-hop interface to the multicast router.

With static, specify the interface of the member port. It can be one of these values:

fastethernet interface number—a Fast Ethernet 802.3 interface.

gigabitethernet interface number—a Gigabit Ethernet 802.a interface.

port-channel interface number—a channel interface. Valid values are from 0 to 64.

learn

(Optional) The multicast router learning method.

cgmp

(Optional) Set the switch to learn multicast router ports by snooping on CGMP packets.

pim-dvmrp

(Optional) Set the switch to learn multicast router ports by snooping on IGMP queries and Protocol-Independent Multicasting-Distance Vector Multicast Routing Protocol (PIM-DVMRP) packets.

static mac-address

(Optional) Add a Layer 2 port as a member of a multicast group with the specified group MAC address.



Note Though visible in the command-line help string, the tcn keyword is not supported.


Defaults

IGMP snooping is globally enabled on the switch.

IGMP snooping is enabled on VLAN interfaces.

IGMP immediate-leave processing is disabled.

The default learning method is pim-dvmrp—to snoop IGMP queries and PIM-DVMRP packets.

By default, there are no ports specified as members of a static multicast group.

By default, there are no multicast router ports.

Command Modes

Global configuration

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.


Usage Guidelines

When IGMP snooping is enabled globally, it is enabled in all the existing VLAN interfaces. When IGMP snooping is disabled globally, it is disabled in all the existing VLAN interfaces.

The configuration is saved in nonvolatile RAM (NVRAM).

You should configure only the Immediate Leave feature when there is a maximum of one receiver on every port in the VLAN. The configuration is saved in NVRAM.

The Immediate Leave feature is supported only with IGMP version 2 hosts.

The CGMP learn method is useful for cutting down on control traffic.

The configured learn method is saved in NVRAM.

The static keyword is used for configuring the IGMP member ports statically.

The static ports and groups are saved in NVRAM.

Examples

This example shows how to globally enable IGMP snooping:

Switch(config)# ip igmp snooping

This example shows how to globally disable IGMP snooping:

Switch(config)# no ip igmp snooping

This example shows how to enable IGMP snooping on VLAN 1:

Switch(config)# ip igmp snooping vlan 1

This example shows how to disable IGMP snooping on VLAN 1:

Switch(config)# no ip igmp snooping vlan 1

This example shows how to enable IGMP immediate-leave processing on VLAN 1:

Switch(config)# ip igmp snooping vlan 1 immediate-leave

This example shows how to disable IGMP immediate-leave processing on VLAN 1:

Switch(config)# no ip igmp snooping vlan 1 immediate-leave

This example shows how to configure Gigabit Ethernet interface 0/2 as a multicast router port:

Switch(config)# ip igmp snooping vlan 1 mrouter interface gigabitethernet0/2

This example shows how to specify the multicast router learning method as CGMP:

Switch(config)# no ip igmp snooping vlan 1 mrouter learn cgmp

This example shows how to configure a host statically on an interface:

Switch(config)# ip igmp snooping vlan 1 static 0100.5e02.0203 interface gigabitethernet0/6
Configuring port gigabitethernet0/6 on group 0100.5e02.0203
Switch(config)# 

You can verify your settings by entering the show ip igmp snooping privileged EXEC command.

Related Commands

Command
Description

ip igmp snooping report-suppression

Enables IGMP report suppression.

ip igmp snooping source-only-learning age-timer

Enables and configures the aging time of the forward-table entries that the switch learns by using the source-only learning method.

show ip igmp profile

Displays the snooping configuration.

show mac address-table multicast

Displays the Layer 2 multicast entries for a VLAN.


ip igmp snooping report-suppression

Use the ip igmp snooping report-suppression global configuration command to enable Internet Group Management Protocol (IGMP) report suppression. Use the no form of this command to disable IGMP report suppression and forward all IGMP reports to multicast routers.

ip igmp snooping report-suppression

no ip igmp snooping report-suppression

Syntax Description

This command has no arguments or keywords.

Defaults

IGMP report suppression is enabled.

Command Modes

Global configuration

Command History

Release
Modification

12.1(19)EA1

This command was introduced.


Usage Guidelines

IGMP report suppression is supported only when the multicast query has IGMPv1 and IGMPv2 reports. This feature is not supported when the query includes IGMPv3 reports.

The switch uses IGMP report suppression to forward only one IGMP report per multicast router query to multicast devices. When IGMP router suppression is enabled (the default), the switch sends the first IGMP report from all hosts for a group to all the multicast routers. The switch does not send the remaining IGMP reports for the group to the multicast routers. This feature prevents duplicate reports from being sent to the multicast devices.

If the multicast router query includes requests only for IGMPv1 and IGMPv2 reports, the switch forwards only the first IGMPv1 or IGMPv2 report from all hosts for a group to all the multicast routers. If the multicast router query also includes requests for IGMPv3 reports, the switch forwards all IGMPv1, IGMPv2, and IGMPv3 reports for a group to the multicast devices.

If you disable IGMP report suppression by entering the no ip igmp snooping report-suppression command, all IGMP reports are forwarded to all the multicast routers.

Examples

This example shows how to disable report suppression:

Switch(config)# no ip igmp snooping report-suppression

This example shows how to enable report suppression:

Switch(config)# ip igmp snooping report-suppression

You can verify your settings by entering the show ip igmp snooping privileged EXEC command.

Related Commands

Command
Description

ip igmp snooping

Globally enables IGMP snooping. IGMP snooping must be globally enabled in order to be enabled on a VLAN.

show ip igmp snooping

Displays the IGMP snooping configuration of the switch or the VLAN.


ip igmp snooping source-only-learning age-timer

Use the ip igmp snooping source-only-learning age-timer global configuration command to enable and configure the aging time of the forward-table entries that the switch learns by using the source-only learning method. Use the no form of this command to return the aging time to the default setting.

ip igmp snooping source-only-learning age-timer time

no ip igmp snooping source-only-learning age-timer

Syntax Description

time

Aging time is seconds. The valid range is 0 to 2880 seconds. If you set time to 0, aging of the forward-table entries is disabled.


The aging feature is enabled. The default is 600 seconds (10 minutes).

Command Modes

Global configuration

Command History

Release
Modification

12.1(14)EA1

This command was first introduced.


Usage Guidelines

In a source-only network, switch ports are connected to multicast source ports and multicast router ports. The switch ports are not connected to hosts that send IGMP join or leave messages.

The switch learns about IP multicast groups that alias with the reserved, destination, IP multicast addresses (in the range 224.0.0.xxx) from the IP multicast data stream by using the source-only learning method. The switch forwards traffic that aliases with these multicast addresses only to the multicast router ports. You cannot disable IP multicast-source-only learning for traffic that aliases with these multicast addresses.

The aging time only affects the forwarding-table entries that the switch learns by using the source-only learning method. If the aging time is too long or is disabled, the forwarding table is filled with unused multicast addresses that the switch learned by using source-only learning or by using the IGMP join messages. When the switch receives traffic for new IP multicast groups, it floods the packet to all ports in the same VLAN. This unnecessary flooding can impact switch performance.

To disable the aging of the forwarding-table entries, enter the ip igmp snooping source-only-learning age-timer 0 global configuration command. If aging is disabled and you want to delete multicast addresses that the switch learned by using source-only-learning, re-enable aging of the forwarding-table entries. The switch can now age out the multicast addresses that were learned by the source-only learning method and that are not in use.

Examples

This example shows how to set the aging time as 1200 seconds (20 minutes):

Switch(config)# ip igmp snooping source-only-learning age-timer 1200

This example shows how to disable aging of the forward-table entries:

Switch(config)# ip igmp snooping source-only-learning age-timer 0

You can verify your settings by entering the show running-config | include source-only-learning privileged EXEC command.

Related Commands

Command
Description

ip igmp snooping

Globally enables IGMP snooping. IGMP snooping must be globally enabled in order to be enabled on a VLAN.

show running-config | include source-only-learning

Displays the configuration information running 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.


ip ssh

Use the ip ssh global configuration command to configure the switch to run Secure Shell (SSH) version 1 or SSH version 2. Use the no form of this command to return to the default setting.

ip ssh version [1 | 2]

no ip ssh version [1 | 2]

This command is available only when your switch is running the cryptographic (encrypted) software image.

Syntax Description

1

(Optional) Configure the switch to run SSH version 1 (SSHv1).

2

(Optional) Configure the switch to run SSH version 2 (SSHv1).


Defaults

The default version is the latest SSH version supported by the SSH client.

Command Modes

Global configuration

Command History

Release
Modification

12.1(19)EA1

This command was introduced.


Usage Guidelines

If you do not enter this command or if you do not specify a keyword, the SSH server selects the latest SSH version supported by the SSH client. For example, if the SSH client supports SSHv1 and SSHv2, the SSH server selects SSHv2.

The switch supports an SSHv1 or an SSHv2 server. It also supports an SSHv1 client. For more information about the SSH server and the SSH client, refer to the software configuration guide for this release.

A Rivest, Shamir, and Adelman (RSA) key pair generated by an SSHv1 server can be used by an SSHv2 server and the reverse.

Examples

This example shows how to configure the switch to run SSH version 2:

Switch(config)# ip ssh version 2

You can verify your settings by entering the show ip ssh or show ssh privileged EXEC command.

Related Commands

Command
Description

show ip ssh

Displays if the SSH server is enabled and displays the version and configuration information for the SSH server. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Security Command Reference, Release 12.2 > Other Security Features > Secure Shell Commands.

show ssh

Displays the status of the SSH server. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Security Command Reference, Release 12.2 > Other Security Features > Secure Shell Commands.


ip vrf (global configuration)

Use the ip-vrf global configuration command to configure a Virtual Private Network (VPN) routing/forwarding (VRF) routing table and to enter VRF configuration mode. Use the no form of this command to remove a VRF routing table and to return to global configuration mode.

ip vrf vrf-name

no ip vrf vrf-name


Note The Catalyst 3550 switch supports multi-VPN routing/forwarding (multi-VRF) instances in customer edge (CE) devices. You must have the enhanced multilayer image (EMI) installed on your switch to configure multi-VRF CE.


Syntax Description

vrf-name

Name assigned to a VRF.


Defaults

No VRFs are defined.

No import or export lists are associated with a VRF.

No route maps are associated with a VRF.

The maximum number of routes in a VRF is 8000 for Fast Ethernet switches and 12000 for Gigabit Ethernet switches.

Command Modes

Global configuration or router configuration

Command History

Release
Modification

12.1(11)EA1

This command was first introduced.


Usage Guidelines

Entering the ip vrf command enables the VRF configuration mode. These configuration commands are available:

default: set a command (description, export, import, maximum routes, route-target) to its default setting.

description: describes the VRF (up to 80 characters).

exit: exits VRF configuration mode and returns to global configuration mode.

export map route-map: set a route-map to be used as an export route map for the VRF.

import map route-map: set a route-map to be used as an import route map for the VRF.

maximum routes limit {warn threshold | warn-only}: limit the maximum number of routes in a VRF to prevent a PE router from importing too many routes. The limits are from 1 to 4294967295; the threshold is a percentage of the limit, from 1 to 100.

no: negate a command or return to its default setting.

rd: specify Route Distinguisher as either an autonomous system-relative composed of an autonomous system (AS) number and an arbitrary number, or as an IP-address-relative composed of an IP address and an arbitrary number.

16-bit AS number: 32-bit number (for example, 101:3)

32-bit IP address: 16-bit number (for example, 192.168.122.15:1.)

route-target {import | export | both} route-target-ext-community: specify Target VPN Extended Communities. You can specify the Target for export, import, or both.

To return to global configuration mode, use the exit command. To return to privileged EXEC mode, use the end command.

Use an import route map when an application requires finer control over the routes imported into a VRF than that provided by the import and export extended communities configured for the importing and exporting VRF. The import map command associates a route map with the specified VRF. You can filter routes that are eligible for import into a VRF, based on the route target extended community attributes of the route, by using a route map. The route map might deny access to selected routes from a community that is on the import list.

If you set a maximum routes threshold, the switch rejects routes when the threshold limit is reached. If you enter warn-only, the switch creates a syslog error message when the maximum number of VRF routes exceeds the allowed limit, but additional routes are still allowed

A route distinguisher (RD) creates routing and forwarding tables and specifies the default route distinguisher for a VPN. A route distinguisher must be configured for a VRF to be functional. The RD is added to the beginning of the customer's IPv4 prefixes to change them into globally unique VPN-IPv4 prefixes.

The route target specifies a target VPN extended community. Like a route-distinguisher, an extended community is composed of either an autonomous system number and an arbitrary number or an IP address and an arbitrary number.

The ip vrf vrf-name command creates a VRF routing table and a Cisco Express Forwarding (CEF) forwarding table, both named vrf-name. Associated with these tables is the default route distinguisher value route-distinguisher.

Examples

This example shows how to create the VRF named vpn1, enter VRF configuration mode, and import a route map to the VRF:

Switch(config)# ip vrf vpn1
Switch(config-vrf)# rd 100:2
Switch(config-vrf)# route-target both 100:2
Switch(config-vrf)# route-target import 100:1

Related Commands

Command
Description

ip vrf (interface configuration)

Associate a VRF routing table or a route map with an interface.

show ip route vrf

Displays the IP routing table associated with a VRF. For syntax information, go to Cisco IOS Switching Services Command Reference for Release 12.1.

show ip vrf

Displays display the set of defined VRFs and associated interfaces. For syntax information, go to Cisco IOS Switching Services Command Reference for Release 12.1.


ip vrf (interface configuration)

Use the ip-vrf interface configuration command to associate a Virtual Private Network (VPN) routing/forwarding (VRF) routing table or a route map with an interface. Use the no form of this command to disassociate the VRF routing table or route map.

ip vrf {forwarding table-name | sitemap route-map-name}

no ip vrf {forwarding table-name | sitemap route-map-name}


Note The Catalyst 3550 switch supports multi-VPN routing/forwarding (multi-VRF) instances in customer edge (CE) devices. You must have the enhanced multilayer image (EMI) installed on your switch to configure multi-VRF CE.


Syntax Description

forwarding table-name

Specify a VRF forwarding table name for the interface.

sitemap route-map-name

Specify a VRF route-map for routes received from this site.


Defaults

The default for an interface is the global routing table.

Command Modes

Interface configuration

Command History

Release
Modification

12.1(11)EA1

This command was first introduced.


Usage Guidelines

Use the ip vrf forwarding command to associate an interface with a VRF. Executing this command on an interface removes the IP address. You must reconfigure the IP address.

Examples

This example shows how to link the VRF named vpn1 to Fast Ethernet interface 0/12:

Switch(config)# interface fastethernet 0/12
Switch(config-if)# ip vrf forwarding vpn1

Related Commands

Command
Description

ip vrf (global configuration)

Configures a VRF routing table.

ip route vrf

Establishes static routes for a VRF. For syntax information, go to Cisco IOS Switching Services Command Reference for Release 12.1.

show ip route vrf

Displays the IP routing table associated with a VRF. For syntax information, go to Cisco IOS Switching Services Command Reference for Release 12.1.

show ip vrf

Displays display the set of defined VRFs and associated interfaces. For syntax information, go to Cisco IOS Switching Services Command Reference for Release 12.1.


l2protocol-tunnel

Use the l2protocol-tunnel interface configuration command to enable tunneling of Layer 2 protocols on an access or 802.1Q tunnel port. You can enable tunneling for Cisco Discovery Protocol (CDP), Spanning Tree Protocol (STP), or VLAN Trunking Protocol (VTP) packets. You can also enable point-to-point tunneling for Port Aggregation Protocol (PAgP), Link Aggregation Control Protocol (LACP), or UniDirectional Link Detection (UDLD) packets. Use the no form of this command to disable tunneling on the interface.

l2protocol-tunnel [cdp | stp | vtp] [point-to-point [pagp | lacp | udld]] | [shutdown-threshold
[cdp | stp | vtp] [point-to-point [pagp | lacp | udld]]] value] | [drop-threshold [cdp | stp | vtp] [point-to-point [pagp | lacp | udld]]] value]

no l2protocol-tunnel [cdp | stp | vtp] [point-to-point [pagp | lacp | udld]] | [shutdown-threshold
[cdp | stp | vtp] [point-to-point [pagp | lacp | udld]] value] | [drop-threshold [cdp | stp | vtp] [point-to-point [pagp | lacp | udld]] value]

Syntax Description

l2protocol-tunnel

Enable point-to-multipoint tunneling of CDP, STP, and VTP packets.

cdp

(Optional) Enable tunneling of CDP, specify a shutdown threshold for CDP, or specify a drop threshold for CDP.

stp

(Optional) Enable tunneling of STP, specify a shutdown threshold for STP, or specify a drop threshold for STP.

vtp

(Optional) Enable tunneling or VTP, specify a shutdown threshold for VTP, or specify a drop threshold for VTP.

point-to-point

(Optional) Enable point-to point tunneling of PAgP, LACP, and UDLD packets.

pagp

(Optional) Enable point-to-point tunneling of PAgP, specify a shutdown threshold for PAgP, or specify a drop threshold for PAgP.

lacp

(Optional) Enable point-to-point tunneling of LACP, specify a shutdown threshold for LACP, or specify a drop threshold for LACP.

udld

(Optional) Enable point-to-point tunneling of UDLD, specify a shutdown threshold for UDLD, or specify a drop threshold for UDLD.

shutdown-threshold

(Optional) Set a shutdown threshold for the maximum rate of Layer 2 protocol packets per second to be received before an interface is shut down.

drop-threshold

(Optional) Set a drop threshold for the maximum rate of Layer 2 protocol packets per second to be received before an interface drops packets.

value

Specify a threshold in packets per second to be received for encapsulation before the interface shuts down, or specify the threshold before the interface drops packets. The range is 1 to 4096. The default is no threshold.


Defaults

The default is that no Layer 2 protocol packets are tunneled.

The default is no shutdown threshold for the number of Layer 2 protocol packets.

The default is no drop threshold for the number of Layer 2 protocol packets.

Command Modes

Interface configuration

Command History

Release
Modification

12.1(9)EA1

This command was first introduced.

12.1(13)EA1

The drop-threshold keywords was added.

12.1(19)EA1

The point-to-point, pagp, lacp, and udld keywords were added.


Usage Guidelines

You must enter this command, with or without protocol types, to tunnel Layer 2 packets.

Layer 2 protocol tunneling across a service-provider network ensures that Layer 2 information is propagated across the network to all customer locations. When protocol tunneling is enabled, protocol packets are encapsulated with a well-known Cisco multicast address for transmission across the network. When the packets reach their destination, the well-known MAC address is replaced by the Layer 2 protocol MAC address.

You can enable Layer 2 protocol tunneling for CDP, STP, and VTP individually or for all three protocols.

In a service-provider network, you can use Layer 2 protocol tunneling to enhance the creation of EtherChannels by emulating a point-to-point network topology. When protocol tunneling is enabled on the service-provider switch for PAgP or LACP, remote customer switches receive the protocol data units (PDUs) and can negotiate automatic creation of EtherChannels.

To enable tunneling of PAgP, LACP, and UDLD packets, you must have a point-to-point network topology. To decrease the link-down detection time, you should also enable UDLD on the interface when you enable tunneling of PAgP or LACP packets.

You can enable point-to-point protocol tunneling for PAgP, LACP, and UDLD individually or for all three protocols.


Caution PAgP, LACP, and UDLD tunneling is only intended to emulate a point-to-point topology. An erroneous configuration that sends tunneled packets to many ports could lead to a network failure.

Enter the shutdown-threshold keyword to control the number of protocol packets per second that are received on an interface before it shuts down. When no protocol option is specified with the keyword, the threshold is applied to each of the tunneled Layer 2 protocol types. If you also set a drop threshold on the interface, the shutdown-threshold value must be greater than or equal to the drop-threshold value.

When the shutdown threshold is reached, the interface is error-disabled. If you enable error recovery by entering the errdisable recovery cause l2ptguard global configuration command, the interface is brought out of the error-disabled state and allowed to retry the operation again when all the causes have timed out. If the error recovery mechanism is not enabled for l2ptguard, the interface stays in the error-disabled state until you enter the shutdown and no shutdown interface configuration commands.

Enter the drop-threshold keyword to control the number of protocol packets per second that are received on an interface before it drops packets. When no protocol option is specified with a keyword, the threshold is applied to each of the tunneled Layer 2 protocol types. If you also set a shutdown threshold on the interface, the drop-threshold value must be less than or equal to the shutdown-threshold value.

When the drop threshold is reached, the interface drops Layer 2 protocol packets until the rate at which they are received is below the drop threshold.

The configuration is saved in NVRAM.


Note For more information about Layer 2 protocol tunneling, refer to the software configuration guide for this release.


Examples

This example shows how to enable protocol tunneling for CDP packets and to configure the shutdown threshold as 50 packets per second:

Switch(config-if)# l2protocol-tunnel cdp
Switch(config-if)# l2protocol-tunnel shutdown-threshold cdp 50

This example shows how to enable protocol tunneling for STP packets and to configure the drop threshold as 400 packets per second:

Switch(config-if)# l2protocol-tunnel stp
Switch(config-if)# l2protocol-tunnel drop-threshold stp 400

This example shows how to enable point-to-point protocol tunneling for PAgP and UDLD packets and to configure the PAgP drop threshold as 1000 packets per second:

Switch(config-if)# l2protocol-tunnel point-to-point pagp
Switch(config-if)# l2protocol-tunnel point-to-point udld
Switch(config-if)# l2protocol-tunnel drop-threshold point-to-point pagp 1000

Related Commands

Command
Description

l2protocol-tunnel cos

Configures a class of service (CoS) value for all tunneled Layer 2 protocol packets.

show errdisable recovery

Displays errdisable recovery timer information.

show l2protocol-tunnel

Displays information about ports configured for Layer 2 protocol tunneling, including port, protocol, class of service (CoS), and threshold.


l2protocol-tunnel cos

Use the l2protocol-tunnel cos global configuration command to configure class of service (CoS) value for all tunneled Layer 2 protocol packets. Use the no form of this command to return to the default value of zero.

l2protocol-tunnel cos value

no l2protocol-tunnel cos

Syntax Description

value

Specify CoS priority value for tunneled Layer 2 protocol packets. If a CoS value is configured for data packets for the interface, the default is to use this CoS value. If no CoS value is configured for the interface, the default is 5. The range is 0 to 7, with 7 being the highest priority.


Defaults

The default is to use the CoS value configured for data on the interface. If no CoS value is configured, the default is 5 for all tunneled Layer 2 protocol packets.

Command Modes

Global configuration

Command History

Release
Modification

12.1(9)EA1

This command was first introduced.


Usage Guidelines

When enabled, the tunneled Layer 2 protocol packets use this CoS value.

The value is saved in NVRAM.

Examples

This example shows how to configure a Layer-2 protocol-tunnel CoS value of 7:

Switch(config)# l2protocol-tunnel cos 7

Related Commands

Command
Description

show l2protocol-tunnel

Displays information about ports configured for Layer 2 protocol tunneling, including CoS.


lacp port-priority

Use the lacp port-priority interface configuration command to set the port priority for the Link Aggregration Control Protocol (LACP). Use the no form of this command to return to the default setting.

lacp port-priority priority-value

no lacp port-priority

priority-value

Port priority for LACP. The range is from 1 to 65535.


Defaults

The default priority value is 32768.

Command Modes

Interface configuration

Command History

Release
Modification

12.1(12c)EA1

This command was first introduced.


Usage Guidelines

This command only takes effect on EtherChannel interfaces that are already configured for LACP.


Note For more information about configuring LACP on physical interfaces, refer to the "Configuring EtherChannels" chapter in the software configuration guide for this release.


Examples

This example shows set the port priority for LACP:

Switch(config)# lacp port-priority 32764

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

Related Commands

Command
Description

lacp system-priority

Globally sets the LACP priority.


lacp system-priority

Use the lacp system-priority global configuration command to set the system priority for Link Aggregration Control Protocol (LACP). Use the no form of this command to return to the default setting.

lacp system-priority priority-value

no lacp system-priority

Syntax Description

priority-value

System priority for LACP. The range is from 1 to 65535.


Defaults

The default priority value is 32768.

Command Modes

Global configuration

Command History

Release
Modification

12.1(12c)EA1

This command was first introduced.


Usage Guidelines

Although this is a global configuration command, the priority only takes effect on EtherChannels that have physical interfaces with LACP enabled.


Note For more information about configuring LACP on physical interfaces, refer to the "Configuring EtherChannels" chapter in the software configuration guide for this release.


Examples

This example shows how to set the system priority for LACP:

Switch(config)# lacp system-priority 32764

You can verify your settings by entering the show lacp internal privileged EXEC command.

Related Commands

Command
Description

lacp port-priority

Sets the LACP priority for a specific port.


logging file

Use the logging file global configuration command to set logging file parameters. Use the no form of this command to return to the default setting.

logging file flash:filename [max-file-size] [min-file-size] [severity-level-number | type]

no logging file flash:filename [severity-level-number | type]

Syntax Description

flash:filename

The path and name of the file that contains the log messages.

max-file-size

(Optional) Specify the maximum logging file size. The range is 4096 to 2147483647.

min-file-size

(Optional) Specify the minimum logging file size. The range is 1024 to 2147483647.

severity-level-number

(Optional) Specify the logging severity level. The range is 0 to 7. See the type option for the meaning of each level.

type

(Optional) Specify the logging type. These keywords are valid:

emergencies—System is unusable (severity 0).

alerts—Immediate action needed (severity 1).

critical—Critical conditions (severity 2).

errors—Error conditions (severity 3).

warnings—Warning conditions (severity 4).

notifications—Normal but significant messages (severity 5).

information—Information messages (severity 6).

debugging—Debugging messages (severity 7).


Defaults

The minimum file size is 2048 bytes; the maximum file size is 4096 bytes.

The default severity level is 7 (debugging messages and numerically lower levels).

Command Modes

Global configuration

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.


Usage Guidelines

The log file is stored in ASCII text format. You can use the more privileged EXEC command to display its contents.

The command rejects the minimum file size if it is greater than the maximum file size minus 1024; the minimum file size then becomes the maximum file size minus 1024.

Specifying a level causes messages at that level and numerically lower levels to be displayed.

Examples

This example shows how to save informational log messages to a file in Flash memory:

Switch(config)# logging file flash:logfile informational

You can verify your setting 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.


mac access-group

Use the mac access-group interface configuration command to apply a MAC access control list (ACL) to a Layer 2 interface. Use the no form of this command to remove all MAC ACLs or the specified ACL from the interface. You create the MAC ACL by using the mac access-list extended global configuration command.

mac access-group {name} in

no mac access-group [name]

Syntax Description

name

Specify a named MAC access list.

in

Specify that the ACL is applied in the ingress direction. Outbound ACLs are not supported on Layer 2 interfaces.


Defaults

No MAC ACL is applied to the interface.

Command Modes

Interface configuration (Layer 2 interfaces only)

Command History

Release
Modification

12.1(9)EA1

This command was first introduced.


Usage Guidelines

You can apply MAC ACLs only to ingress Layer 2 interfaces. You cannot apply MAC ACLs to Layer 3 interfaces.

On Layer 2 interfaces, you can filter IP traffic by using IP access lists and non-IP traffic by using MAC access lists. You can filter both IP and non-IP traffic on the same Layer 2 interface by applying both an IP ACL and a MAC ACL to the interface.

You cannot apply more than one MAC ACL to a Layer 2 interface. If a MAC ACL is already configured on a Layer 2 interface and you apply a new MAC ACL to the interface, the new ACL replaces the previously configured one.

You cannot apply a MAC ACL (or IP ACL) to a Layer 2 interface on a switch that has an input Layer 3 ACL or a VLAN map applied to it. If a switch has a MAC ACL or IP ACL applied to a Layer 2 interface, you cannot apply an IP ACL to an input Layer 3 interface on that switch, and you cannot apply a VLAN map to any of the switch VLANs.

When an inbound packet is received on an interface with a MAC ACL applied, the switch checks the match conditions in the ACL. If the conditions are matched, the switch forwards or drops the packet, according to the ACL action.

If the specified ACL does not exist, the switch forwards all packets.


Note For more information about configuring MAC extended ACLs, refer to the "Configuring Network Security with ACLs" chapter in the software configuration guide for this release.


Examples

This example shows how to apply a MAC extended ACL named macacl2 to an interface:

Switch(config)# interface fastethernet0/1
Switch(config-if)# mac access-group macacl2 in

You can verify your settings by entering the show mac access-group privileged EXEC command. You can view configured ACLs on the switch by entering the show access-lists privileged EXEC command.

Related Commands

Command
Description

show access-lists

Displays the ACLs configured on the switch.

show mac access-group

Displays the MAC ACLs configured on the switch.

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.


mac access-list extended

Use the mac access-list extended global configuration command to create an access list based on MAC addresses for non-IP traffic. Using this command puts you in the extended MAC access list configuration mode. Use the no form of this command to return to the default setting.

mac access-list extended name

no mac access-list extended name

Syntax Description

name

Assign a name to the MAC extended access list.


Defaults

By default, there are no MAC access lists created.

Command Modes

Global configuration

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.


Usage Guidelines

MAC named extended lists are used with VLAN maps and class maps.

You should use this command (and not the access-list global configuration command) for defining Layer 2 access lists.

Entering the mac access-list extended command enables the MAC-access list configuration mode. These configuration commands are available:

default: sets a command to its default.

deny: specifies packets to reject. For more information, see the deny MAC-access list configuration command.

exit: exits from MAC-access list configuration mode.

no: negates a command or sets its defaults.

permit: specifies packets to forward. For more information, see the permit command.


Note For more information about MAC extended access lists, refer to the software configuration guide for this release.


Examples

This example shows how to create a MAC named extended access list named mac1 and to enter extended MAC access list configuration mode:

Switch(config)# mac access-list extended mac1
Switch(config-ext-macl)#

This example shows how to delete MAC named extended access list mac1:

Switch(config)# no mac access-list extended mac1

You can verify your settings by entering the show access-lists privileged EXEC command.

Related Commands

Command
Description

deny

permit

Configures the MAC ACL (in extended MAC-access list configuration mode).

show access-lists

Displays the access lists configured on the switch.

vlan access-map

Defines a VLAN map and enters access-map configuration mode where you can specify a MAC ACL to match and the action to be taken.


mac address-table aging-time

Use the mac address-table aging-time global configuration command to set the length of time that a dynamic entry remains in the MAC address table after the entry is used or updated. Use the no form of this command to return to the default setting. The aging time applies to all VLANs or a specified VLAN.

mac address-table aging-time {0 | 10-1000000} [vlan vlan-id]

no mac address-table aging-time {0 | 10-1000000} [vlan vlan-id]


Note Beginning with Cisco IOS Release 12.1(11)EA1, the mac address-table aging-time command replaces the mac-address-table aging-time command (with the hyphen).


Syntax Description

0

This value disables aging. Static address entries are never aged or removed from the table.

10-100000

Aging time in seconds. The range is 10 to 1000000 seconds.

vlan vlan-id

(Optional) Specify the VLAN ID to which to apply the aging time. Valid IDs are from 1 to 4094.


Defaults

The default is 300 seconds.

Command Modes

Global configuration

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.

12.1(11)EA1

The mac-address-table aging-time command was replaced by the mac address-table aging-time command.


Usage Guidelines

If hosts do not send continuously, increase the aging time to record the dynamic entries for a longer time. Increasing the time can reduce the possibility of flooding when the hosts send again.

Examples

This example shows how to set the aging time to 200 seconds for all VLANs:

Switch(config)# mac address-table aging-time 200

You can verify your setting by entering the show mac address-table aging-time privileged EXEC command.

Related Commands

Command
Description

show mac address-table aging-time

Displays the MAC address table aging time for all VLANs or the specified VLAN.


mac address-table notification

Use the mac address-table notification global configuration command to enable the MAC address notification feature on the switch. Use the no form of this command to return to the default setting.

mac address-table notification [history-size value] | [interval value]

no mac address-table notification [history-size | interval]


Note Beginning with Cisco IOS Release 12.1(11)EA1, the mac address-table notification command replaces the mac-address-table notification command (with the hyphen).


Syntax Description

history-size value

(Optional) Configure the maximum number of entries in the MAC notification history table. The range is 1 to 500 entries.

interval value

(Optional) Set the notification trap interval. The switch sends the notification traps when this amount of time has elapsed. The range is 0 to 2147483647 seconds.


Defaults

By default, the MAC address notification feature is disabled.

The default trap interval value is 1 second.

The default number of entries in the history table is 1.

Command Modes

Global configuration

Command History

Release
Modification

12.1(8)EA1

This command was first introduced.

12.1(11)EA1

The mac-address-table notification command was replaced by the mac address-table notification command.


Usage Guidelines

The MAC address notification feature sends Simple Network Management Protocol (SNMP) traps to the network management system (NMS) whenever a new MAC address is added or an old address is deleted from the forwarding tables. MAC notifications are generated only for dynamic and secure MAC addresses. Events are not generated for self addresses, multicast addresses, or other static addresses.

When you configure the history-size option, the existing MAC address history table is deleted, and a new table is created.

You enable the MAC address notification feature by using the mac address-table notification command. You must also enable MAC address notification traps on an interface by using the snmp trap mac-notification interface configuration command and configure the switch to send MAC address traps to the NMS by using the snmp-server enable traps mac-notification global configuration command.

Examples

This example shows how to enable the MAC address-table notification feature, set the interval time to 60 seconds, and set the history-size to 100 entries:

Switch(config)# mac address-table notification
Switch(config)# mac address-table notification interval 60 
Switch(config)# mac address-table notification history-size 100

You can verify your settings by entering the show mac address-table notification privileged EXEC command.

Related Commands

Command
Description

clear mac address-table notification

Clears the MAC address notification global counters.

show mac address-table notification

Displays the MAC address notification settings on all interfaces or on the specified interface.

snmp-server enable traps

Sends the SNMP MAC notification traps when the mac-notification keyword is appended.

snmp trap mac-notification

Enables the SNMP MAC notification trap on a specific interface.


mac address-table static

Use the mac address-table static global configuration command to add static addresses to the MAC address table. Use the no form of this command to remove static entries from the table.

mac address-table static mac-addr vlan vlan-id interface interface-id

no mac address-table static mac-addr vlan vlan-id [interface interface-id]


Note Beginning with Cisco IOS Release 12.1(11)EA1, the mac address-table static command replaces the mac-address-table static command (with the hyphen).


Syntax Description

mac-addr

Destination MAC address (unicast or multicast) to add to the address table. Packets with this destination address received in the specified VLAN are forwarded to the specified interface.

vlan vlan-id

Specify the VLAN for which the packet with the specified MAC address is received. Valid VLAN IDs are 1 to 4094.

interface interface-id

Interface to which the received packet is forwarded. Valid interfaces include physical ports and port channels.


Defaults

No static addresses are configured.

Command Modes

Global configuration

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.

12.1(11)EA1

The mac-address-table static command was replaced by the mac address-table static command.


Examples

This example shows how to add the static address c2f3.220a.12f4 to the MAC address table. When a packet is received in VLAN 4 with this MAC address as its destination, the packet is forwarded to the specified interface:

Switch(config)# mac address-table static c2f3.220a.12f4 vlan 4 interface 
gigabitethernet0/1

You can verify your setting by entering the show mac address-table privileged EXEC command.

Related Commands

Command
Description

show mac address-table static

Displays static MAC address table entries only.


mac address-table static drop

Use the mac address-table static drop global configuration command to enable unicast MAC address filtering and to configure the switch to drop traffic with a specific source or destination MAC address. Use the no form of this command to return to the default setting.

mac address-table static mac-addr vlan vlan-id drop

no mac address-table static mac-addr vlan vlan-id

Syntax Description

mac-addr

Unicast source or destination MAC address. Packets with this MAC address are dropped.

vlan vlan-id

Specify the VLAN for which the packet with the specified MAC address is received. Valid VLAN IDs are 1 to 4094.


Defaults

Unicast MAC address filtering is disabled. The switch does not drop traffic for specific source or destination MAC addresses.

Command Modes

Global configuration

Command History

Release
Modification

12.1(19)EA1

This command was first introduced.


Usage Guidelines

Follow these guidelines when using this feature:

Multicast MAC addresses, broadcast MAC addresses, and router MAC addresses are not supported. Packets that are forwarded to the CPU are also not supported.

If you add a unicast MAC address as a static address and configure unicast MAC address filtering, the switch either adds the MAC address as a static address or drops packets with that MAC address, depending on which command was entered last. The second command that you entered overrides the first command.

For example, if you enter the mac address-table static mac-addr vlan vlan-id interface interface-id global configuration command followed by the mac address-table static mac-addr vlan vlan-id drop command, the switch drops packets with the specified MAC address as a source or destination.

If you enter the mac address-table static mac-addr vlan vlan-id drop global configuration command followed by the mac address-table static mac-addr vlan vlan-id interface interface-id command, the switch adds the MAC address as a static address.

Examples

This example shows how to enable unicast MAC address filtering and to configure the switch to drop packets that have a source or destination address of c2f3.220a.12f4. When a packet is received in VLAN 4 with this MAC address as its source or destination, the packet is dropped:

Switch(config)# mac address-table static c2f3.220a.12f4 vlan 4 drop

This example shows how to disable unicast MAC address filtering:

Switch(config)# no mac address-table static c2f3.220a.12f4 vlan 4 

You can verify your setting by entering the show mac address-table static privileged EXEC command.

Related Commands

Command
Description

show mac address-table static

Displays only static MAC address table entries.


macro apply

Use the macro apply interface configuration command to apply a macro to an interface or to apply and trace a macro configuration on an interface.

macro {apply | trace} macro-name

Syntax Description

apply

Apply a macro to the specified interface.

trace

Use the trace keyword to apply a macro to an interface and to debug the macro.

macro-name

Specify the name of the macro.


Defaults

This command has no default setting.

Command Modes

Interface configuration

Command History

Release
Modification

12.1(19)EA1

This command was first introduced.


Usage Guidelines

You can use the macro trace macro-name interface configuration command to show what macros are running on an interface or to debug the macro to determine any syntax or configuration errors.

If a command fails when you apply a macro, either due to a syntax error or a configuration error, the macro continues to apply the remaining commands to the interface.

There is not a no macro apply interface configuration command to remove the set of commands applied by a macro. You can delete a macro-applied configuration on an interface by entering the default interface interface-id interface configuration command.

A macro applied to an interface range behaves the same as a macro applied to a single interface. When you use an interface range, the macro is applied sequentially to each individual interface within the range. If a macro command fails on one interface, it is still applied to the remaining interfaces.

This example shows how to apply the duplex macro to an interface:

Switch(config-if)#macro apply duplex

This example shows how troubleshoot a macro on an interface:

Switch(config-if)# macro trace duplex2
Applying command...`duplex auto'
%Error Unknown error.
Applying command...`speed nonegotiate'

Related Commands

Command
Description

show parser macro

Displays the macro definition for all macros or for the specified macro.

show running-config

Displays the configuration information currently running 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.


macro description

Use the macro description interface configuration command to enter a description about which macros are applied to an interface. Use the no form of this command to remove the description.

macro description text

no macro description text

Syntax Description

description text

Enter a description about the macros that are applied to the specified interface.


Defaults

This command has no default setting.

Command Modes

Interface configuration

Command History

Release
Modification

12.1(19)EA1

This command was first introduced.


Usage Guidelines

Use the description keyword to associate comment text, or the macro name, with an interface. When multiple macros are applied on a single interface, the description text will be from the last applied macro.

This example shows how to add a description to an interface:

Switch(config-if)#macro description duplex settings

You can verify your settings by entering the show parser macro description privileged EXEC command.

Related Commands

Command
Description

show parser macro

Displays the macro definition for all macros or for the specified macro.

show running-config

Displays the configuration information currently running 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.


macro name

Use the macro name global configuration command to create a configuration macro. Use the no form of this command to delete the macro definition.

macro name macro-name

no macro name macro-name

Syntax Description

macro-name

Name of the macro.


Defaults

This command has no default setting.

Command Modes

Global configuration

Command History

Release
Modification

12.1(19)EA1

This command was first introduced.


Usage Guidelines

A macro can contain up to 3000 characters. Enter one macro command per line. Use the @ character to end the macro. Use the # character at the beginning of a line to enter comment text within the macro.

We recommend that you do not use the exit or end commands in a macro. This could cause commands that follow exit or end to execute in a different command mode. For best results, all commands in a macro should be interface configuration mode commands.

The no form of this command only deletes the macro definition. It does not affect the configuration of those interfaces on which the macro is already applied. You can delete a macro-applied configuration on an interface by entering the default interface interface-id interface configuration command. Alternatively, you can create an anti-macro for an existing macro that contains the no form of all the corresponding commands in the original macro. Then apply the anti-macro to the interface.

You can modify a macro by creating a new macro with the same name as the existing macro. The newly created macro overwrites the existing macro but does not affect the configuration of those interfaces on which the original macro was applied.

Examples

This example shows how to create a macro that defines the duplex mode and speed:

Switch(config)# macro name duplex
Enter macro commands one per line. End with the character `@'.
duplex full
speed auto
@

Related Commands

Command
Description

show parser macro

Displays the macro definition for all macros or for the specified macro.

show running-config

Displays the current operating configuration, including defined macros. For syntax information, select Cisco IOS Configuration Fundamentals Command Reference for Release 12.1 > Cisco IOS File Management Commands > Configuration File Commands.


match (access-map configuration)

Use the match access-map configuration command to set the VLAN map to match packets against one or more access lists. Use the no form of this command to remove the match parameters.

match {ip address {name | number} [name | number] [name | number]...} | {mac address {name} [name] [name]...}

no match {ip address {name | number} [name | number] [name | number]...} | {mac address {name} [name] [name]...}

Syntax Description

ip address

Set the access map to match packets against an IP address access list.

mac address

Set the access map to match packets against a MAC address access list.

name

Name of the access list to match packets against.

number

Number of the access list to match packets against. This option is not valid for MAC access lists.


Defaults

The default action is to have no match parameters applied to a VLAN map.

Command Modes

Access-map configuration

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.


Usage Guidelines

You enter access-map configuration mode by using the vlan access-map global configuration command.

You must enter one access list name or number; others are optional. You can match packets against one or more access lists. Matching any of the lists counts as a match of the entry.

In access-map configuration mode, use the match command to define the match conditions for a VLAN map applied to a VLAN. Use the action command to set the action that occurs when the packet matches the conditions.

Packets are matched only against access lists of the same protocol type; IP packets are matched against IP access lists, and all other packets are matched against MAC access lists.

Both IP and MAC addresses can be specified for the same map entry.

Examples

This example shows how to define and apply a VLAN access map vmap4 to VLANs 5 and 6 that will cause the interface to drop an IP packet if the packet matches the conditions defined in access list al2.

Switch(config)# vlan access-map vmap4
Switch(config-access-map)# match ip address al2
Switch(config-access-map)# action drop
Switch(config-access-map)# exit
Switch(config)# vlan filter vmap4 vlan-list 5-6

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

Related Commands

Command
Description

access-list

Configures a standard numbered ACL. For syntax information, select Cisco IOS IP and IP Routing Command Reference for IOS
Release 12.1 > IP Addressing and Services > IP Services Commands
.

action

Specifies the action to be taken if the packet matches an entry in an access control list (ACL).

ip access list

Creates a named access list. 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

Creates a named MAC address access list.

match (access-map configuration)

Defines the match conditions for a VLAN map.

show vlan access-map

Displays the VLAN access maps created on the switch.

vlan access-map

Creates a VLAN access map.


match (class-map configuration)

Use the match class-map configuration command to define the match criteria to classify traffic. Use the no form of this command to remove the match criteria.

match {access-group acl-index-or-name | class-map class-map-name | ip dscp dscp-list
| ip precedence ip-precedence-list | vlan vlan-list}

no match {access-group acl-index-or-name | class-map class-map-name | ip dscp dscp-list
| ip precedence ip-precedence-list | vlan vlan-list}

Syntax Description

access-group acl-index-or-name

Number or name of an IP standard or extended access control list (ACL) or MAC ACL. For an IP standard ACL, the ACL index range is 1 to 99 and 1300 to 1999. For an IP extended ACL, the ACL index range is 100 to 199 and 2000 to 2699.

class-map class-map-name

Name of predefined class map for classification that is performed on a per-port per-VLAN basis.

ip dscp dscp-list

List of up to eight IP Differentiated Services Code Point (DSCP) values to match against incoming packets. Separate each value with a space. The range is 0 to 63. You also can enter a mnemonic name for a commonly-used value.

ip precedence ip-precedence-list

List of up to eight IP-precedence values to match against incoming packets. Separate each value with a space. The range is 0 to 7. You also can enter a mnemonic name for a commonly-used value

vlan vlan-list

List of VLANs to match against incoming packets. You can enter up to 30 VLAN IDs. Use a hyphen for a range of VLANs. A VLAN range is counted as two VLAN IDs. Use a space to separate individual VLANs. The range is 1 to 4094.



Note Though visible in the command-line help strings, the any, destination-address, input-interface, mpls, not, protocol, and source-address keywords are not supported.


Defaults

No match criteria are defined.

Command Modes

Class-map configuration

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.

12.1(11)EA1

The class-map and vlan keywords were added.


Usage Guidelines

The match command is used to specify which fields in the incoming packets are examined to classify the packets. Only the IP access group or the MAC access group matching to the Ether Type/Len are supported.

To define packet classification on a physical-port basis, only one match command per class map is supported. In this situation, the match-all and match-any keywords are equivalent.

To define packet classification on a per-port per-VLAN basis, follow these guidelines:

You must use the match-all keyword with the class-map global configuration command to imply the Logical-AND of all matching statements under this class map.

Per-port per-VLAN classification is a per-port feature and does not work on redundant links. It is supported only on an ingress port configured as a trunk or as a static-access port.

The class map must have two match commands in this order: one match vlan vlan-list class-map configuration command and one match class-map class-map-name class-map configuration command. The class map specified in the match class-map class-map-name command must be predefined and cannot contain the match vlan vlan-list and the match class-map class-map-name commands.

You cannot configure both port-based classification and VLAN-based classification at the same time. When you enter the match vlan vlan-list command, the class map becomes per-port per-VLAN based. If you configure a policy map that contains both port-based and VLAN-based class maps, the switch rejects the policy map when you attach it to an interface.

Within a policy map, when you use the match vlan vlan-list command, all other class maps must use the match vlan vlan-list command.

If you want to modify the VLAN list, first remove the previous configuration in the class map by using the no match vlan vlan-list command and the no match class-map class-map-name command. Then reconfigure the class map, and specify the new VLAN list. If the policy map is attached to an interface and you modify the class map by using any other method, the policy map detaches from the interface.

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

You cannot attach policy maps that contain these elements to an egress interface by using the service-policy interface configuration command:

set or trust policy-map class configuration commands. Instead, you can use the police policy-map class configuration command to mark down (reduce) the DSCP value at the egress interface.

Access control list (ACL) classification.

Per-port per-VLAN classification.

The only match criterion in a policy map that can be attached to an egress interface is the match ip dscp dscp-list class-map configuration command.

Examples

This example shows how to create a class map called class2, which matches all the incoming traffic with DSCP values of 10, 11, and 12:

Switch(config)# class-map class2
Switch(config-cmap)# match ip dscp 10 11 12
Switch(config-cmap)# exit

This example shows how to create a class map called class3, which matches all the incoming traffic with IP-precedence values of 5, 6, and 7:

Switch(config)# class-map class3
Switch(config-cmap)# match ip precedence 5 6 7 
Switch(config-cmap)# exit

This example shows how to delete the IP-precedence match criteria and to classify traffic with acl1:

Switch(config)# class-map class2
Switch(config-cmap)# match ip precedence 5 6 7 
Switch(config-cmap)# no match ip precedence
Switch(config-cmap)# match access-group acl1
Switch(config-cmap)# exit

This example shows how to configure a class map called dscp_class whose match criterion is to match IP DSCP 9. A second class map, called vlan_class, matches traffic on VLANs 10, 20 to 30, and 40 to class map dscp_class:

Switch(config)# class-map match-any dscp_class
Switch(config-cmap)# match ip dscp 9
Switch(config-cmap)# exit
Switch(config)# class-map match-all vlan_class
Switch(config-cmap)# match vlan 10 20-30 40
Switch(config-cmap)# match class-map dscp_class
Switch(config-cmap)# exit

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

Related Commands

Command
Description

class-map

Creates a class map to be used for matching packets to the class whose name you specify.

show class-map

Displays quality of service (QoS) class maps.


mls aclmerge delay

Use the mls aclmerge delay global configuration command to adjust the time required for access control list (ACL) configuration to be stable before the system performs ACL merges and ternary content addressable memory (TCAM) updates. Use the no form of this command to return to the default setting.

mls aclmerge delay delay-time

no mls aclmerge delay

Syntax Description

delay-time

The time in milliseconds that the system requires ACL configuration to be stable before it performs an ACL merge. The range is 0 to 3000.


Defaults

The default time is 3000 milliseconds (3 seconds).

Command Modes

Global configuration

Command History

Release
Modification

12.1(11)EA1

This command was first introduced.


Usage Guidelines

Because ACL merges take a significant amount of time, if the configuration of security ACLs on the system is changing rapidly, the software postpones ACL merges and TCAM updates until the configuration is no longer changing. By default, if a new security ACL-related configuration change is made within 3000 milliseconds of a previous change, the merge is postponed. ACL-related configuration changes include applying ACLs to interfaces or making changes to ACLs or VLAN maps that are already applied to interfaces. All postponed merges and TCAM updates are performed by a background process after the configuration has been stable for 3000 milliseconds. A configuration is stable if no changes are being made that affect information stored in the TCAM.

Entering the mls aclmerge delay command allows the merge delay to be adjusted to less than 3 seconds. Setting the delay to 0 causes all merges to be performed immediately as the configuration is changed.

New settings affect all ACL configuration changes made after the command is entered. If the configuration is saved to the startup configuration file, when the switch boots up, the merge settings do not take affect until after the complete saved configuration file is read. This allows initial configuration to proceed efficiently.

Examples

This example shows how to change the merge delay to be 2000 milliseconds (2 seconds):

Switch(config)# mls aclmerge delay 2000

This example shows how to set the merge to be performed immediately:

Switch(config)# mls aclmerge delay 0

You can verify the ACL merge setting by entering the show running-config | include mls aclmerge delay privileged EXEC command.

Related Commands

Command
Description

access-list {deny | permit}

Configures a standard numbered ACL. For syntax information, select Cisco IOS IP and IP Routing Command Reference for IOS
Release 12.1 > IP Addressing and Services > IP Services Commands
.

action (access map configuration)

Defines or modifies the action for the VLAN access map entry.

ip access-group

Applies an IP access list to a Layer 2 or Layer 3 interface.

ip access-list

Configures a named access list. 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-group

Applies a MAC access list to a Layer 2 interface.

match (access-map configuration)

Defines the match conditions for a VLAN map.

show running-config | include mls aclmerge delay

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.

vlan access-map

Creates a VLAN access map or enters access-map configuration mode.

vlan filter

Applies a VLAN map to one or more VLANs.


mls qos

Use the mls qos global configuration command to enable quality of service (QoS) for the entire switch. When the mls qos command is entered, QoS is enabled with the default parameters on all ports in the system. Use the no form of this command to reset all the QoS-related statistics and to disable the QoS features for the entire switch.

mls qos

no mls qos

Syntax Description

This command has no arguments or keywords.

Defaults

QoS is disabled. Table 2-5 shows the default QoS settings when QoS is disabled.

Table 2-5 Default QoS Configuration when QoS is Disabled

Port
Type
QoS
State
Egress traffic (DSCP 1 and CoS 2 Value)
Queue
Queue
Weights
Tail-drop Thresholds
CoS Mapping
to Queue

Gigabit-capable Ethernet ports

Disabled

Pass through.

All the queue RAM is allocated to queue 1 (no expedite queue).

-

100%, 100%

WRED3 is disabled.

All CoS values map to queue 1.

10/100 Ethernet ports

Disabled

Pass through.

Each of the eight minimum-reserve levels have a buffer size of 100 packets. The queue selects the level.

-

-

All CoS values map to queue 1.

1 Differentiated Services Code Point

2 Class of service

3 Weighted Random Early Detection


When QoS is disabled, there is no concept of trusted or untrusted ports because the packets are not modified (the CoS, DSCP, and IP precedence values in the packet are not changed).

Table 2-6 shows the default QoS settings when QoS is enabled.

Table 2-6 Default QoS Configuration when QoS is Enabled

Port
Type
QoS
State
Egress traffic (DSCP and CoS Value)
Queue
Queue
Weights
Tail-drop Thresholds
CoS Mapping to Queue

Gigabit-capable Ethernet ports

Enabled

(no policing)

DSCP=0

CoS=0

(0 means best-effort delivery.)

Four queues are available (no expedite queue).

Each queue has the same weight.

100%, 100%

WRED is disabled.

0, 1: queue 1

2, 3: queue 2

4, 5: queue 3

6, 7: queue 4

10/100 Ethernet ports

Enabled

(no policing)

DSCP=0

CoS=0

(0 means best-effort delivery.)

Each of the eight minimum-reserve levels have a buffer size of 100 packets. The queue selects the level.

Each queue has the same weight.

-

0, 1: queue 1

2, 3: queue 2

4, 5: queue 3

6, 7: queue 4


When QoS is enabled, the default trust state on all ports is untrusted.

Command Modes

Global configuration

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.


Usage Guidelines

QoS must be globally enabled to use QoS classification, policing, mark down or drop, and queueing features. You can create a policy-map and attach it to a port before executing the mls qos command. However, until you enter the mls qos command, QoS processing is disabled.

You must disable 802.3X flow control on all ports before enabling QoS on the switch. To disable it, use the flowcontrol receive off and flowcontrol send off interface configuration commands.

When QoS is enabled without any further configuration, ingress traffic is classified to best-effort without any policing. DSCP and CoS values carried in packets are rewritten to 0. For the egress direction, all four queues are configured with same weighted round robin (WRR) weights, and all the packets (that have been classified as best-effort traffic) are placed at the queue mapped to CoS value equal to 0.

QoS features at the ingress port include traffic classification (by class map, packet DSCP/CoS, or port DSCP/CoS), policing, and possibly marking-down or dropping out-of-profile packets. At the egress port, traffic can be also classified (by packet DSCP or CoS assigned at the ingress port), policed, and possibly marked down or dropped. If not dropped, the packet is placed in one of four queues, which can be configured with tail-drop or WRED threshold parameters.

Policy-maps and class-maps used to configure QoS are not deleted from the configuration by the no mls qos command, but entries corresponding to policy maps are removed from the switch hardware to save system resources. To re-enable QoS with the previous configurations, use the mls qos command.

When QoS is disabled, ingress traffic is switched in pass-through mode, which means packets are switched without any rewrites and are classified to best effort without any policing. No ingress and egress policers are configured. All CoS values for egress traffic are mapped to queue 1.

Toggling the QoS status of the switch with this command modifies (reallocates) the sizes of the queues. During the queue size modification, the switch is in a halt mode and drops packets for a short period.

Examples

This example shows how to disable flow control on all interfaces and then enable QoS on the switch:

Switch(config)# interface range gigabitethernet0/1 -12
Switch(config-if)# flowcontrol receive off
Switch(config-if-range)# flowcontrol send off
Switch(config-if-range)# exit
Switch(config)# mls qos

This example shows how to disable all QoS processing on the switch:

Switch(config)# no mls qos

You can verify your settings by entering the show mls qos privileged EXEC command.

Related Commands

Command
Description

flowcontrol

Sets the receive or send flow-control value for an interface.

mls qos min-reserve

Configures the minimum-reserve levels (segments) on 10/100 Ethernet ports.

show mls qos

Displays QoS information.

wrr-queue bandwidth

Assigns WRR weights to the four egress queues.

wrr-queue min-reserve

Assigns a minimum-reserve level to an egress queue on a 10/100 Ethernet port.

wrr-queue queue-limit

Configures the sizes of the egress queues on Gigabit-capable Ethernet ports.

wrr-queue threshold

Assigns tail-drop threshold percentages to an egress queue of a Gigabit-capable Ethernet port.


mls qos aggregate-policer

Use the mls qos aggregate-policer global configuration command to define policer parameters, which can be shared by multiple classes within the same policy map. Use the no form of this command to delete an aggregate policer.

mls qos aggregate-policer aggregate-policer-name rate-bps burst-byte exceed-action {drop | policed-dscp-transmit}

no mls qos aggregate-policer aggregate-policer-name

Syntax Description

aggregate-policer-name

Name of the aggregate policer referenced by the police aggregate policy-map class configuration command.

rate-bps

Specify average traffic rate in bits per second (bps). The range is 8000 to 2000000000.

burst-byte

Specify the normal burst size in bytes. The range is 8000 to 512000000.

exceed-action drop

When the specified rate is exceeded, specify that the switch drop the packet.

exceed-action policed-dscp-transmit

When the specified rate is exceeded, specify that the switch change the Differentiated Services Code Point (DSCP) of the packet to that specified in the policed-DSCP map and then send the packet.


Defaults

No aggregate policers are defined.

Command Modes

Global configuration

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.


Usage Guidelines

Define an aggregate policer if the policer is shared with multiple classes.

Policers in one port cannot be shared with other policers in another port; traffic from two different ports cannot be aggregated for policing purposes.

You cannot attach an aggregate policer to the ingress or egress of the same port.

Although the command-line help strings show a large range of values, the rate-bps option cannot exceed the configured port speed, and the burst-byte option cannot exceed 2000000 bytes. If you enter a larger value, the switch rejects the policy map when you attach it to an interface.

You apply an aggregate policer to multiple classes in the same policy map; you cannot use an aggregate policer across different policy maps or interfaces.

You cannot delete an aggregate policer if it is being used in a policy map. You must first use the no police aggregate aggregate-policer-name policy-map class configuration command to delete the aggregate policer from all policy maps before using the no mls qos aggregate-policer aggregate-policer-name command.

Policing uses a token bucket algorithm. You configure the bucket depth (the maximum burst that is tolerated before the bucket overflows) by using the burst-byte option of the police policy-map class configuration command or the mls qos aggregate-policer global configuration command. You configure how fast (the average rate) that the tokens are removed from the bucket by using the rate-bps option of the police policy-map class configuration command or the mls qos aggregate-policer global configuration command. For more information, refer to the software configuration guide for this release.

Examples

This example shows how to define the aggregate policer parameters and apply the policer to multiple classes in a policy map:

Switch(config)# mls qos aggregate-policer agg_policer1 10000 1000000 exceed-action drop
Switch(config)# policy-map policy2
Switch(config-pmap)# class class1
Switch(config-pmap-c)# police aggregate agg_policer1
Switch(config-pmap-c)# exit
Switch(config-pmap)# class class2 
Switch(config-pmap-c)# set ip dscp 10
Switch(config-pmap-c)# police aggregate agg_policer1
Switch(config-pmap-c)# exit
Switch(config-pmap)# class class3
Switch(config-pmap-c)# trust dscp
Switch(config-pmap-c)# police aggregate agg_policer2
Switch(config-pmap-c)# exit

You can verify your settings by entering the show mls qos aggregate-policer privileged EXEC command.

Related Commands

Command
Description

police aggregate

Creates a policer that is shared by different classes.

show mls qos aggregate-policer

Displays the quality of service (QoS) aggregate policer configuration.


mls qos cos

Use the mls qos cos interface configuration command to define the default class of service (CoS) value of a port or assign the default CoS to all incoming packets on the port. Use the no form of this command to return to the default setting.

mls qos cos {default-cos | override}

no mls qos cos {default-cos | override}

Syntax Description

default-cos

Assign a default CoS value to a port. If the port is CoS trusted and packets are untagged, the default CoS value becomes a CoS value used to select one output queue to index into the CoS-to-Differentiated Services Code Point (DSCP) map. The CoS range is 0 to 7.

override

Override the CoS of the incoming packets, and apply the default CoS value on the port to all incoming packets.


Defaults

The default CoS value for a port is 0.

CoS override is disabled.

Command Modes

Interface configuration

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.


Usage Guidelines

You can use the default value to assign a CoS and DSCP value to all packets entering a port if the port has been configured with the override keyword.

Use the override keyword when all incoming packets on certain ports deserve higher or lower priority than packets entering from other ports. Even if a port is previously set to trust DSCP, CoS, or IP precedence, this command overrides the previously configured trust state, and all the incoming CoS values are assigned the default CoS value configured with the mls qos cos command. If an incoming packet is tagged, the CoS value of the packet is modified with the default CoS of the port at the ingress port.

Examples

This example shows how to configure the default port CoS to 4:

Switch(config)# interface gigabitethernet0/1
Switch(config-if)# mls qos trust cos
Switch(config-if)# mls qos cos 4

This example shows how to assign all the packets entering a port to the default port CoS value of 4:

Switch(config)# interface gigabitethernet0/1
Switch(config-if)# mls qos cos 4
Switch(config-if)# mls qos cos override

You can verify your settings by entering the show mls qos interface privileged EXEC command.

Related Commands

Command
Description

show mls qos interface

Displays quality of service (QoS) information.


mls qos cos policy-map

Use the mls qos cos policy-map global configuration command to set the class of service (CoS) value of a port in a policy map. Use the no form of this command to return to the default setting.

mls qos cos policy-map

no mls qos cos policy-map

Syntax Description

This command has no arguments or keywords.

Defaults

The CoS value is not set in a policy map.

Command Modes

Global configuration

Command History

Release
Modification

12.1(12c)EA1

This command was first introduced.


Usage Guidelines

When using the mls qos cos policy-map global configuration command, you can specify the CoS value in a policy map that includes the trust dscp policy-map configuration command.

If you do not use the mls qos cos policy-map command but use the set cos new-cos policy-map class configuration command, the switch ignores the action defined by the set cos command in the policy map. If this policy map also has an action defined by the trust dscp policy-map class configuration command, the switch uses the Differentiated Services Code Point (DSCP)-to-CoS map to define the CoS value of a port.

Examples

This example shows how to define the CoS value in a policy map. When traffic matches the class map class1, the CoS value for traffic is set to 3, and the DSCP value does change.

Switch(config)# mls qos cos policy-map
Switch(config)# policy-map policy2
Switch(config-pmap)# class class1
Switch(config-pmap-c)# trust dscp
Switch(config-pmap-c)# set cos 3
Switch(config-pmap-c)# exit

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

Related Commands

Command
Description

class

Defines a traffic classification on which a policy acts.

policy-map

Creates or modifies a policy map that can be attached to multiple interfaces and enters policy-map configuration mode.

set

Classifies IP traffic by setting a CoS, DSCP, or IP-precedence value in the packet.

show policy-map

Displays quality of service (QoS) policy maps.

trust

Defines a trust state for traffic classified by the class policy-map configuration or the class-map global configuration command.


mls qos dscp-mutation

Use the mls qos dscp-mutation interface configuration command to apply a Differentiated Services Code Point (DSCP)-to-DSCP-mutation map to a DSCP-trusted port. Use the no form of this command to return the DSCP-to-DSCP-mutation map to the default settings (no DSCP mutation).

mls qos dscp-mutation dscp-mutation-name

no mls qos dscp-mutation dscp-mutation-name

Syntax Description

dscp-mutation-name

Name of the DSCP-to-DSCP-mutation map, which was previously defined with the mls qos map dscp-mutation global configuration command.


Defaults

The default DSCP-to-DSCP-mutation map is a null map, which maps incoming DSCPs to the same DSCP values.

Command Modes

Interface configuration

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.


Usage Guidelines

You apply the DSCP-to-DSCP-mutation map to a port at the boundary of a quality of service (QoS) administrative domain. If two QoS domains have different DSCP definitions between them, you use the DSCP-to-DSCP-mutation map to translate a set of DSCP values to match the definition of another domain. You apply the map only to ingress and to DSCP-trusted ports. Applying this map to a port causes IP packets to be rewritten with newly mapped DSCP values at the ingress ports. If you apply the DSCP mutation map to an untrusted port, to class of service (CoS) or IP-precedence trusted port, the command has no immediate effect until the port becomes DSCP-trusted.

You can have multiple DSCP-to-DSCP-mutation maps and apply them to different Gigabit-capable Ethernet ports. However, on 10/100 Ethernet ports, you can attach only one DSCP-to-DSCP-mutation map to a group of twelve ports. For example, Fast Ethernet ports 0/1 to 0/12 are a group, Fast Ethernet ports 0/13 to 0/24 are a group, Gigabit Ethernet port 0/1 is a group, and Gigabit Ethernet port 0/2 is a group. When applying a mutation map to any port in a group, all ports in the same group are automatically configured with the same map.

Examples

This example shows how to define the DSCP-to-DSCP-mutation map named dscpmutation1and to apply the map to a port:

Switch(config)# mls qos map dscp-mutation dscpmutation1 10 11 12 13 to 30
Switch(config)# interface gigabitethernet0/1
Switch(config-if)# mls qos trust dscp
Switch(config-if)# mls qos dscp-mutation dscpmutation1

This example show how to remove the DSCP-to-DSCP-mutation map name dscpmutation1 from the port and to reset the map to the default:

Switch(config-if)# no mls qos dscp-mutation dscpmutation1

You can verify your settings by entering the show mls qos maps privileged EXEC command.

Related Commands

Command
Description

mls qos map dscp-mutation

Defines the DSCP-to-DSCP-mutation map.

mls qos trust

Configures the port trust state.

show mls qos maps

Displays QoS mapping information.


mls qos map

Use the mls qos map global configuration command to define the class of service (CoS)-to-Differentiated Services Code Point (DSCP) map, DSCP-to-CoS map, the DSCP-to-DSCP-mutation map, the DSCP-to-switch-priority map, the IP-precedence-to-DSCP map, and the policed-DSCP map. Use the no form of this command to return to the default map.

mls qos map {cos-dscp dscp1...dscp8 | dscp-cos dscp-list to cos | dscp-mutation dscp-mutation-name in-dscp to out-dscp | dscp-switch-priority dscp-list to switch-priority | ip-prec-dscp dscp1...dscp8 | policed-dscp dscp-list to mark-down-dscp}

no mls qos map {cos-dscp | dscp-cos | dscp-mutation dscp-mutation-name | dscp-switch-priority | ip-prec-dscp | policed-dscp}

Syntax Description

cos-dscp dscp1...dscp8

Define the CoS-to-DSCP map.

For dscp1...dscp8, enter eight DSCP values that correspond to CoS values 0 to 7. Separate each DSCP value with a space. The range is 0 to 63.

dscp-cos dscp-list to cos

Define the DSCP-to-CoS map.

For dscp-list, enter up to eight DSCP values, with each value separated by a space. The range is 0 to 63. Then enter the to keyword.

For cos, enter the CoS value to which the DSCP values correspond. The range is 0 to 7.

dscp-mutation dscp-mutation-name in-dscp to out-dscp

Define the DSCP-to-DSCP-mutation map.

For dscp-mutation-name, enter the mutation map name.

For in-dscp, enter up to eight DSCP values, with each value separated by a space. Then enter the to keyword.

For out-dscp, enter a single DSCP value.

The range is 0 to 63.

dscp-switch-priority dscp-list to switch-priority

Define the DSCP-to-switch-priority map. This map generates the priority of a request to the switch fabric when using a priority-aware switch fabric.

For dscp-list, enter up to eight DSCP values, with each value separated by a space. The range is 0 to 63. Then enter the to keyword.

For switch-priority, the range is 0 to 3.

ip-prec-dscp dscp1...dscp8

Define the IP-precedence-to-DSCP map.

For dscp1...dscp8, enter eight DSCP values that correspond to the IP precedence values 0 to 7. Separate each DSCP value with a space. The range is 0 to 63.

policed-dscp dscp-list to mark-down-dscp

Define the policed-DSCP map.

For dscp-list, enter up to eight DSCP values, with each value separated by a space. Then enter the to keyword.

For mark-down-dscp, enter the corresponding policed (marked down) DSCP value.

The range is 0 to 63.


Defaults

Table 2-7 shows the default CoS-to-DSCP map:

Table 2-7 Default CoS-to-DSCP Map

CoS Value

0

1

2

3

4

5

6

7

DSCP Value

0

8

16

24

32

40

48

56


Table 2-8 shows the default DSCP-to-CoS map:

Table 2-8 Default DSCP-to-CoS Map

DSCP Value

0-7

8-15

16-23

24-31

32-39

40-47

48-55

56-63

CoS Value

0

1

2

3

4

5

6

7


Table 2-9 shows the default DSCP-to-switch priority map:

Table 2-9 Default DSCP-to-Switch Priority

DSCP Value

0-15

16-31

32-47

48-63

Switch Priority

0

1

2

3


Table 2-10 shows the default IP-precedence-to-DSCP map:

Table 2-10 Default IP-Precedence-to-DSCP Map

IP Precedence Value

0

1

2

3

4

5

6

7

DSCP Value

0

8

16

24

32

40

48

56


The default DSCP-to-DSCP-mutation map is a null map, which maps an incoming DSCP value to the same DSCP value.

The default policed-DSCP map is a null map, which maps an incoming DSCP value to the same DSCP value.

Command Modes

Global configuration

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.


Usage Guidelines

All the maps are globally defined. All the maps, except the DSCP-to-DSCP-mutation map, are applied to all ports. The DSCP-to-DSCP-mutation map is applied to a specific port. You can have multiple DSCP-to-DSCP-mutation maps, and apply them to different Gigabit-capable Ethernet ports. Because a group of twelve 10/100 Ethernet ports (Fast Ethernet 0/1 to 0/12, 0/13 to 0/24, and so forth) shares a single DSCP-to-DSCP-mutation map, only one map can be attached to each 10/100 group.

Examples

This example shows how to define the IP-precedence-to-DSCP map and map IP-precedence values 0 to 7 to DSCP values of 0, 10, 20, 30, 40, 50, 55, and 60:

Switch# configure terminal
Switch(config)# mls qos map ip-prec-dscp 0 10 20 30 40 50 55 60

This example shows how to define the policed-DSCP map. DSCP values 1, 2, 3, 4, 5, and 6 are marked down to DSCP value 0. Marked DSCP values that not explicitly configured are not modified:

Switch# configure terminal
Switch(config)# mls qos map policed-dscp 1 2 3 4 5 6 to 0

This example shows how to define the DSCP-to-CoS map. DSCP values 20, 21, 22, 23, and 24 are mapped to CoS 1. DSCP values 10, 11, 12, 13, 14, 15, 16, and 17 are mapped to CoS 0:

Switch# configure terminal
Switch(config)# mls qos map dscp-cos 20 21 22 23 24 to 1
Switch(config)# mls qos map dscp-cos 10 11 12 13 14 15 16 17 to 0

This example shows how to define the CoS-to-DSCP map. CoS values 0 to 7 are mapped to DSCP values 0, 5, 10, 15, 20, 25, 30, and 35:

Switch# configure terminal
Switch(config)# mls qos map cos-dscp 0 5 10 15 20 25 30 35

This example shows how to define the DSCP-to-DSCP-mutation map. All the entries that are not explicitly configured are not modified (remain as specified in the null map):

Switch# configure terminal
Switch(config)# mls qos map dscp-mutation mutation1 1 2 3 4 5 6 7 to 10
Switch(config)# mls qos map dscp-mutation mutation1 8 9 10 11 12 13 to 10
Switch(config)# mls qos map dscp-mutation mutation1 20 21 22 to 20
Switch(config)# mls qos map dscp-mutation mutation1 0 31 32 33 34 to 30

You can verify your settings by entering the show mls qos maps privileged EXEC command.

Related Commands

Command
Description

mls qos dscp-mutation

Applies a DSCP-to-DSCP-mutation map to a DSCP-trusted port.

show mls qos maps

Displays quality of service (QoS) mapping information.


mls qos min-reserve

Use the mls qos min-reserve global configuration command to configure the size of the minimum-reserve levels (segments) on all 10/100 Ethernet ports. Use the no form of this command to return to the default setting.

mls qos min-reserve min-reserve-level min-reserve-buffersize

no mls qos min-reserve min-reserve-level

Syntax Description

min-reserve-level

Minimum-reserve level number. The range is 1 to 8.

min-reserve-buffersize

Actual minimum-reserve buffer size. The range is 10 to 170 packets.


Defaults

The buffer size for all eight minimum-reserve levels is 100 packets.

Command Modes

Global configuration

Command History

Release
Modification

12.1(6)EA1

This command was first introduced.


Usage Guidelines

When you enter this command, the switch is in a halt mode and drops packets for a short period.

Use the wrr-queue min-reserve interface configuration command to assign one of these minimum-reserve levels to an egress queue. The minimum-reserve level configuration is meaningless until it is assigned to a particular queue.

Examples

This example shows how to configure minimum-reserve level 5 to 20 packets on all 10/100 Ethernet ports:

Switch(config)# mls qos min-reserve 5 20

You can verify your settings by entering the show mls qos interface buffers privileged EXEC command.

Related Commands

Command
Description

show mls qos interface

Displays quality of service (QoS) information.

wrr-queue min-reserve

Assigns a minimum-reserve level to an egress queue on a 10/100 Ethernet port.


mls qos monitor

Use the mls qos monitor interface configuration command to define up to eight Differentiated Services Code Point (DSCP) values per command for which byte or packet statistics are gathered by hardware. Use the no form of this command to return to the default setting.

mls qos monitor {bytes | dscp dscp1 ... dscp8 | packets}

no mls qos monitor {bytes | dscp dscp1 ... dscp8 | packets}

Syntax Description

bytes

Gather statistics in bytes.

dscp dscp1 ... dscp8

DSCP values to be monitored. Enter up to eight values per command, with each value separated by a space. The range is 0 to 63.

packets

Gather statistics in packets.


Defaults

Statistics are not gathered for any DSCP.

If no keyword is specified when the command is entered, byte statistics are gathered.

Command Modes

Interface configuration

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.


Usage Guidelines

If you want to monitor more than eight DSCP values, you must enter this command again and specify another set of DSCP values. Use this command when you want to find out how many packets are policed and dropped by the quality of service (QoS) process in hardware.

Examples

This example shows how to monitor DSCP values 10 to 20. Note that up to eight values can be entered per command.

Switch(config-if)# mls qos monitor dscp 10 11 12 13 14 15 16 17
Switch(config-if)# mls qos monitor dscp 18 19 20
Switch(config-if)# end
Switch# show mls qos interface statistics

This example shows how to gather packet statistics for DSCPs 10 to 13:

Switch(config-if)# mls qos monitor dscp 10 11 12 13
Switch(config-if)# mls qos monitor packets

You can see the results of the monitoring activity by entering the show mls qos interface statistics privileged EXEC command.

Related Commands

Command
Description

show mls qos interface

Displays all the DSCPs for which statistics are maintained and the corresponding ingress and egress statistics, including the number of bytes dropped, when the statistics keyword is appended.


mls qos trust

Use the mls qos trust interface configuration command to configure the port trust state. Ingress traffic can be trusted, and classification is performed by examining the Differentiated Services Code Point (DSCP), class of service (CoS), or IP-precedence packet field. Use the no form of this command to return a port to its untrusted state.

mls qos trust [cos [pass-through dscp] | device cisco-phone | dscp [pass-through cos] | ip-precedence]

no mls qos trust [cos [pass-through] | device | dscp [pass-through] | ip-precedence]

Syntax Description

cos

(Optional) Classify ingress packets with packet CoS values. For untagged packets, use the port default CoS value.

cos pass-through dscp

(Optional) Classify ingress packets by trusting the CoS value and by sending packets without modifying the DSCP value (pass-through mode).

device cisco-phone

(Optional) Classify ingress packets by trusting the value sent from the Cisco IP phone (trusted boundary).

dscp

(Optional) Classify ingress packets with packet DSCP values (most significant 6 bits of 8-bit service-type field). For non-IP packets, the packet CoS is used if the packet is tagged. The default port CoS value is used if the packet is untagged.

dscp pass-through cos

(Optional) Classify ingress packets by trusting the DSCP value and by sending packets without modifying the CoS value (pass-through mode).

ip-precedence

(Optional) Classify ingress packets with IP-precedence values (most significant 3 bits of 8-bit service-type field). For non-IP packets, the packet CoS is used if the packet is tagged. The port default CoS value is used if the packet is untagged.


Defaults

The port is not trusted. If no keyword is specified when the command is entered, the default is dscp.

Command Modes

Interface configuration

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.

12.1(11)EA1

The device cisco-phone, pass-through cos, and pass-through dscp keywords were added.


Usage Guidelines

Packets entering a quality of service (QoS) domain are classified at the edge of the QoS domain. When the packets are classified at the edge, the switch port within the QoS domain can be configured to one of the trusted states because there is no need to classify the packets at every switch within the domain. Use this command to specify whether the port is trusted and which fields of the packet to use to classify traffic.

When a port is configured with trust DSCP or trust IP precedence and the incoming packet is a non-IP packet, the CoS-to-DSCP map derives the corresponding DSCP value from the CoS value. The CoS can be the packet CoS for trunk ports or the port default CoS for nontrunk ports.

If the DSCP is trusted, the DSCP field of the IP packet is not modified. However, it is still possible that the CoS value of the packet is modified (according to the CP-to-CoS map) unless the pass-through cos keyword is specified.

If the CoS is trusted, the CoS field of the packet is not modified, but the DSCP can be modified (according to the CoS-to-DSCP map) if the packet is an IP packet (unless the pass-through dscp keyword is specified).

If you configure the mls qos trust [cos pass-through dscp | dscp pass-through cos] interface configuration command and then configure the mls qos trust [cos | dscp] interface configuration command, pass-through mode is disabled.

If you configure an interface for DSCP pass-through mode by using the mls qos trust cos pass-through dscp interface configuration command and apply the DSCP-to-DSCP mutation map to the same interface, the DSCP value changes according to the mutation map.

The trusted boundary feature prevents security problems if users disconnect their PCs from networked Cisco IP phones and connect them to the switch port to take advantage of trusted CoS settings. You must globally enable the Cisco Discovery Protocol (CDP) on the switch and on the interface connected to the IP phone. If the telephone is not detected, trusted boundary disables the trusted setting on the switch port (sets the trust state to not trusted) and prevents misuse of a high-priority queue.

For an inter-QoS domain boundary, you can configure the port to the DSCP-trusted state and apply the DSCP-to-DSCP-mutation map if the DSCP values are different between the QoS domains.

A classification that uses a port trust state (for example, mls qos trust [cos | dscp | ip-precedence] and classification that uses a policy map (for example, service-policy input policy-map-name) are mutually exclusive. The last setting configured overwrites the previous configuration.

Examples

This example shows how to configure a port as an IP-precedence trusted port:

Switch(config)# interface gigabitethernet0/1
Switch(config-if)# mls qos trust ip-precedence

This example shows how to specify that the Cisco IP phone is a trusted device:

Switch(config)# interface fastethernet0/1
Switch(config-if)# mls qos trust device cisco-phone

You can verify your settings by entering the show mls qos interface privileged EXEC command.

Related Commands

Command
Description

mls qos cos

Defines the default CoS value of a port or assigns the default CoS to all incoming packets on the port.

mls qos dscp-mutation

Applies a DSCP-to DSCP-mutation map to a DSCP-trusted port.

mls qos map

Defines the CoS-to-DSCP map, DSCP-to-CoS map, the DSCP-to-DSCP-mutation map, the IP-precedence-to-DSCP map, and the policed-DSCP map.

show mls qos interface

Displays QoS information.


monitor session

Use the monitor session global configuration command to start a new Switched Port Analyzer (SPAN) or Remote SPAN (RSPAN) session, to add or delete interfaces or VLANs to or from an existing SPAN or RSPAN session, and to limit (filter) SPAN source traffic to specific source VLANs. Use the no form of this command to remove the SPAN or RSPAN session or to remove source or destination interfaces or filters from the SPAN or RSPAN session.

monitor session session_number {destination {interface interface-id [encapsulation {dot1q [ingress vlan vlan id] | ISL [ingress]} [ingress vlan vlan id] | remote vlan vlan-id reflector-port interface-id} | filter vlan vlan-id [, | -] | {source {interface interface-id [, | -] [both | rx | tx ] | remote vlan vlan-id | vlan vlan-id [, | -] rx}}

no monitor session session_number {destination {interface interface-id [encapsulation {dot1q [ingress vlan vlan id] | ISL [ingress]} [ingress vlan vlan id] | remote vlan vlan-id reflector-port interface-id} | filter vlan vlan-id [, | -] | {source {interface interface-id [, | -] [both | rx | tx ] | remote vlan vlan-id | vlan vlan-id [, | -] rx}}

no monitor session {session_number | all | local | remote}

Syntax Description

session_number

Specify the session number identified with the SPAN or RSPAN session. Valid values are 1 and 2.

destination interface interface-id

Specify the destination interface for a local SPAN session. Valid interfaces are physical ports.

encapsulation

(Optional) Specify the encapsulation header for outgoing packets through a destination port. If encapsulation type is not specified, packets are sent in native form. To reconfigure a destination port in native form, enter the command without the encapsulation keyword.

dot1q

(Optional) Specify the encapsulation type as 802.1Q.

isl

(Optional) Specify the encapsulation type as ISL.

ingress vlan vlan id

(Optional) Specify whether forwarding is enabled for ingress traffic on the destination port.

For native (untagged) and dot1q encapsulation, specify ingress vlan vlan id to enable ingress forwarding with vlan id as the native VLAN. Vlan id is also used as the native VLAN for transmitted packets.

Specify ingress to enable ingress forwarding when using ISL encapsulation.

destination remote vlan vlan-id

Specify the destination remote VLAN for an RSPAN source session.

reflector-port interface-id

Specify the reflector port used for a source RSPAN session.

filter vlan vlan-id

Specify a list of VLANs as filters on trunk source ports. The vlan-id range is 1 to 4094.

source interface interface-id

Specify the SPAN source interface type, slot, and port number. Valid interfaces include physical ports and port channels.

,

(Optional) Specify a series of interfaces or VLANs, or separate a range of interfaces or VLANs from a previous range. Enter a space after the comma.

Note For source interface, you can configure the first port to monitor egress traffic; other ports will be ingress only if a range or list is specified.

-

(Optional) Specify a range of interfaces or VLANs. Enter a space before and after the hyphen.

Note For source interface, you can configure the first port to monitor egress traffic; other ports will be ingress only if a range or list is specified.

both, rx, tx

(Optional) Specify the traffic direction to monitor. If you do not specify a traffic direction, the source interface sends both transmitted and received traffic. Transmitted (tx) traffic can be monitored on only one source port.

source remote vlan vlan-id

Specify the source RSPAN VLAN for an RSPAN destination session.

source vlan vlan-id rx

Specify the SPAN or RSPAN source interface as a VLAN ID. The vlan-id range is 1 to 4094.

VLANs cannot be egress monitored. Direction (rx) must be specified.

all, local, remote

Specify all, local, or remote to clear a SPAN or RSPAN session.


Defaults

On a source interface, the default is to monitor both received and transmitted traffic. On source VLANs, you can monitor only received traffic.

All VLANs are monitored on a trunk interface that is used as a source port.

If encapsulation type is not specified on a destination port, packets are sent in native form with no encapsulation.

Ingress forwarding is disabled on destination ports.

Command Modes

Global configuration

Command History

Release
Modification

12.1(6)EA1

This command was first introduced.

12.1(11)EA1

These RSPAN keywords were added: destination remote vlan reflector-port, source remote vlan, all, local, remote.

12.1(12c)EA1

The ingress vlan keyword was added.


Usage Guidelines

Traffic that enters or leaves source ports or enters source VLANs can be monitored by using SPAN or RSPAN. Traffic routed to source ports or source VLANs cannot be monitored.

You can set a maximum of two SPAN or RSPAN sessions. You can divide the two sessions between SPAN, RSPAN source, and RSPAN destination sessions. Each session can have only one destination port and only one transmitting source port. You can, however, have multiple receiving source ports and VLANs.

You can monitor only received traffic on a VLAN; you cannot monitor transmitted traffic.

You can monitor traffic on a single port or VLAN or on a series or range of ports (ingress traffic only) or VLANs. You select a series or range of interfaces or VLANs by using the [, | -] options.

If you specify a series of VLANs or interfaces, you must enter a space before and after the comma. If you specify a range of VLANs or interfaces, you must enter a space before and after the hyphen (-).

EtherChannel ports cannot be configured as SPAN or RSPAN destination or reflector ports. A physical port that is a member of an EtherChannel group can be used as a source or destination port. It cannot participate in the EtherChannel group while it is configured for SPAN or RSPAN.

A port used as a reflector port cannot be a SPAN or RSPAN source or destination port, nor can a port be a reflector port for more than one session at a time.

A port used as a destination port cannot be a SPAN or RSPAN source or reflector port, nor can a port be a destination port for more than one session at a time.

You can enable 802.1X on a port that is a SPAN or RSPAN destination port; however, 802.1X is disabled until the port is removed as a SPAN destination. (If 802.1X is not available on the port, the switch will return an error message.) You can enable 802.1X on a SPAN or RSPAN source port.

If ingress forwarding is enabled, you can use the SPAN or RSPAN destination port to inject traffic from a network security device. For example, if you connect a Cisco Intrusion Detection System (IDS) Sensor Appliance to a destination port, the IDS device can send TCP Reset packets to close down the TCP session of a suspected attacker.

VLAN monitoring and VLAN filtering are mutually exclusive. If a VLAN is a source, VLAN filtering cannot be enabled. If VLAN filtering is configured, a VLAN cannot become a source.

VLAN-based SPAN (VSPAN) refers to analyzing network traffic in a set of VLANs. All active ports in the source VLANs become source ports for the SPAN or RSPAN session. Trunk ports are included as source ports for VSPAN, and only packets with the monitored VLAN ID are sent to the destination port.

Trunk VLAN filter refers to analyzing network traffic on a selected set of VLANs on trunk source ports. By default, all VLANs are monitored on trunk source ports. You can use the monitor session session_number filter vlan vlan-id command to limit SPAN traffic on the trunk source port to only the specified VLANs.

Examples

This example shows how to create SPAN session 1 to monitor both sent and received traffic on source interface 0/1 on destination interface 0/8:

Switch(config)# monitor session 1 source interface fastEthernet0/1 both
Switch(config)# monitor session 1 destination interface fastEthernet0/8

This example shows how to delete a destination port from an existing SPAN session:

Switch(config)# no monitor session 2 destination fastEthernet0/4

This example shows how to limit SPAN traffic only to specific VLANs:

Switch(config)# monitor session 1 filter vlan 100 - 304

This example shows how to configure RSPAN session 1 to monitor multiple source interfaces and a VLAN and to configure the destination RSPAN VLAN and the reflector-port.

Switch(config)# monitor session 1 source interface fastEthernet0/10 tx
Switch(config)# monitor session 1 source interface fastEthernet0/2 rx
Switch(config)# monitor session 1 source interface port-channel 102 rx
Switch(config)# monitor session 1 source vlan 5 rx
Switch(config)# monitor session 1 destination remote vlan 901 reflector-port 
fastEthernet 0/1
Switch(config)# end

This example shows how to configure the destination port for ingress traffic on VLAN 5 by using a security device that does not support 802.1Q encapsulation.

Switch(config)# monitor session 1 destination interface Fa 0/5 ingress vlan 5

This example shows how to configure the destination port for ingress traffic on VLAN 5 by using a security device that supports 802.1Q encapsulation.

Switch(config)# monitor session 1 destination interface Fa 0/5 encapsulation dot1q ingress 
vlan 5

This example shows how to disable ingress traffic forwarding on the destination port.

Switch(config)# monitor session 1 destination interface Fa 0/5 encapsulation dot1q

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

Related Commands

Command
Description

remote-span

Configures an RSPAN VLAN in vlan configuration mode.

show monitor

Displays SPAN and RSPAN session information.


mvr (global configuration)

Use the mvr global configuration command without keywords to enable the multicast VLAN registration (MVR) feature on the switch. Use the command with keywords to set the MVR mode for a switch, configure the MVR IP multicast address, set the maximum time to wait for a query reply before removing a port from group membership, and to specify the MVR multicast VLAN. Use the no form of this command to return to the default settings.

mvr [group ip-address [count] | mode [compatible | dynamic] | querytime value | vlan vlan-id]

no mvr [group ip-address | mode [compatible | dynamic] | querytime value | vlan vlan-id]

Syntax Description

group ip-address

Statically configure an MVR group IP multicast address on the switch.

Use the no form of this command to remove a statically configured IP multicast address or contiguous addresses or, when no IP address is entered, to remove all statically configured MVR IP multicast addresses.

count

(Optional) Configure multiple contiguous MVR group addresses. The range is from 1 to 256; the default is 1.

mode

(Optional) Specify the MVR mode of operation.

The default is compatible mode.

compatible

Set MVR mode to provide compatibility with Catalyst 2900 XL and 3500 XL switches. This mode does not allow dynamic membership joins on source ports.

dynamic

Set MVR mode to allow dynamic MVR membership on source ports.

querytime value

(Optional) Set the maximum time to wait for IGMP report memberships on a receiver port. This time applies only to receiver-port leave processing. When an IGMP query is sent from a receiver port, the switch waits for the default or configured MVR querytime for an IGMP group membership report before removing the port from multicast group membership.

The value is the response time in units of tenths of a second. The range is from 1 to 100; the default is 5 tenths or one-half second.

Use the no form of the command to return to the default setting.

vlan vlan-id

(Optional) Specify the VLAN on which MVR multicast data is expected to be received. This is also the VLAN to which all the source ports belong. The valid range is 1 to 4094. The default is VLAN 1.


Defaults

MVR is disabled by default.

The default MVR mode is compatible mode.

No IP multicast addresses are configured on the switch by default.

The default group ip address count is 0.

The default query response time is 5 tenths of or one-half second.

The default multicast VLAN for MVR is VLAN 1.

Command Modes

Global configuration

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.


Usage Guidelines

A maximum of 256 MVR multicast groups can be configured on a switch.

Use the mvr group command to statically set up all the IP multicast addresses that will take part in MVR. Any multicast data sent to a configured multicast address is sent to all the source ports on the switch and to all receiver ports that have registered to receive data on that IP multicast address.


Note The mvr group command prevents adding IP multicast addresses that cause address aliasing between MVR multicast groups or with the reserved IP multicast addresses (in the range 224.0.0.xx). Each IP multicast address translates to a multicast 48-bit MAC address. If the IP address being configured translates (aliases) to the same 48-bit MAC address as a previously configured IP multicast address or the reserved MAC multicast addresses, the command fails.


The mvr querytime command applies only to receiver ports.

If the switch MVR is interoperating with Catalyst 2900 XL or Catalyst 3500 XL switches, set the multicast mode to compatible.

When operating in compatible mode, MVR does not support IGMP dynamic joins on MVR source ports.

Multicast routing and MVR cannot coexist on a switch. If you enable multicast routing and a multicast routing protocol while MVR is enabled, MVR is disabled, and a warning message appears. If you try to enable MVR while multicast routing and a multicast routing protocol are enabled, the operation to enable MVR is cancelled with an Error message.

Examples

This example shows how to enable MVR:

Switch(config)# mvr

This example shows how to disable MVR:

Switch(config)# no mvr

Use the show mvr privileged EXEC command to display the current setting for maximum multicast groups.

This example shows how to configure 228.1.23.4 as an IP multicast address:

Switch(config)# mvr group 228.1.23.4

This command fails because of address aliasing:

Switch(config)# mvr group 230.1.23.4

Cannot add this IP address - aliases with previously configured IP address 228.1.23.4. 

This example shows how to configure ten contiguous IP multicast groups with multicast addresses from 228.1.23.1 to 228.1.23.10:

Switch(config)# mvr group 228.1.23.1 10

This example shows how to delete the previously configured ten IP multicast addresses:

Switch(config)# no mvr group 228.1.23.1 10

This example shows how to delete all previously configured IP multicast addresses:

Switch(config)# no mvr group

Use the show mvr members privileged EXEC command to display the IP multicast group addresses configured on the switch.

This example shows how to set the maximum query response time as one second (10 tenths):

Switch(config)# mvr querytime 10

This example shows how to return the maximum query response time to the default setting of one-half second:

Switch(config)# no mvr querytime

This example shows how to set VLAN 2 as the multicast VLAN:

Switch(config)# mvr vlan 2 

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

Related Commands

Command
Description

mvr (interface configuration)

Configures MVR ports.

show mvr

Displays MVR global parameters or port parameters.

show mvr interface

Displays the configured MVR interfaces with their type, status, and Immediate Leave configuration. Also displays all MVR groups of which the interface is a member.

show mvr members

Displays all ports that are members of an MVR multicast group; if the group has no members, its status is shown as Inactive.


mvr (interface configuration)

Use the mvr interface configuration command to configure a Layer 2 port as a multicast VLAN registration (MVR) receiver or source port, to set the Immediate Leave feature and to statically assign a port to an IP multicast VLAN and IP address. Use the no form of this command to return to the default settings.

mvr {immediate | type {receiver | source} | vlan vlan-id group ip-address}

no mvr {immediate | type {source | receiver}| vlan vlan-id group [ip-address]}

Syntax Description

immediate

(Optional) Enable the Immediate Leave feature of MVR on a port. Use the no mvr immediate command to disable the feature.

type

(Optional) Configure the port as an MVR receiver port or a source port.

The default port type is neither an MVR source nor a receiver port. The no mvr type command resets the port as neither a source or a receiver port.

receiver

Configure the port as a subscriber port that can only receive multicast data. Receiver ports cannot belong to the multicast VLAN.

source

Configure the port as an uplink port that can send and receive multicast data for the configured multicast groups. All source ports on a switch belong to a single multicast VLAN.

vlan vlan-id group ip-address

(Optional) Statically configure the specified MVR IP multicast group address for the specified multicast VLAN ID. This is the IP address of the multicast group that the port is joining. If the entered VLAN is not the multicast VLAN, an error message is reported.

The no mvr vlan group command removes a port on a VLAN from membership in an IP multicast address group. With the no form, the IP address is optional; when no IP address is entered, the specified port is removed from membership in all configured multicast groups.


Defaults

A port is configured as neither a receiver nor a source.

The Immediate Leave feature is disabled on all ports.

No receiver port is a member of any configured multicast group.

Command Modes

Interface configuration

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.


Usage Guidelines

Configure a port as a source port if that port should be able to both send and receive multicast data bound for the configured multicast groups. Multicast data is received on all ports configured as source ports.

Receiver ports cannot be trunk ports. Receiver ports on a switch can be in different VLANs, but should not belong to the multicast VLAN.

A port that is not taking part in MVR should not be configured as an MVR receiver port or a source port. A non-MVR port is a normal switch port, able to send and receive multicast data with normal switch behavior.

When Immediate Leave is enabled, a receiver port leaves a multicast group more quickly. Without Immediate Leave, when the switch receives an IGMP leave message from a group on a receiver port, it sends out an IGMP MAC-based query on that port and waits for IGMP group membership reports. If no reports are received in a configured time period, the receiver port is removed from multicast group membership. With Immediate Leave, an IGMP MAC-based query is not sent from the receiver port on which the IGMP leave was received. As soon as the leave message is received, the receiver port is removed from multicast group membership, which speeds up leave latency.

The Immediate Leave feature should be enabled only on receiver ports to which a single receiver device is connected.

The mvr vlan group command statically configures ports to receive multicast traffic sent to the IP multicast address. A port statically configured as a member of group remains a member of the group until statically removed. In compatible mode, this command applies only to receiver ports; in dynamic mode, it can also apply to source ports. Receiver ports can also dynamically join multicast groups by using IGMP join messages.

When operating in compatible mode, MVR does not support IGMP dynamic joins on MVR source ports.

Examples

This example shows how to configure Gigabit Ethernet port 0/1 as an MVR receiver port:

Switch(config)# interface gigabitethernet0/1
Switch(config-if)# mvr type receiver

This example shows how to configure Gigabit Ethernet port 0/2 as an MVR source port:

Switch(config)# interface gigabitethernet0/2
Switch(config-if)# mvr type source

This example shows how to remove port 0/1 as an MVR port:

Switch(config)# interface gigabitethernet0/1
Switch(config-if))# no mvr

This example shows how to display configured receiver ports and source ports.

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 

This example shows how to enable immediate leave on Gigabit Ethernet port 0/1:

Switch(config)# interface gigabitethernet0/1
Switch(config-if)# mvr immediate

This example shows how to disable immediate leave on Gigabit Ethernet port 0/1:

Switch(config)# interface gigabitethernet0/1
Switch(config-if)# no mvr immediate

To display the MVR status and whether or not immediate leave is enabled on an interface, use the show mvr privileged EXEC command for the interface, as in this example:

Switch# show mvr interface gigabitethernet0/2
Type: RECEIVER Status: ACTIVE Immediate Leave: DISABLED 

This example shows how to add Gigabit Ethernet port 0/2 on VLAN 1 as a static member of IP multicast group 228.1.23.4:

Switch(config)# interface gigabitethernet0/2
Switch(config-if)# mvr vlan1 group 230.1.23.4

This example shows how to remove this port from membership:

Switch(config)# interface gigabitethernet0/1
Switch(config-if)# no mvr vlan5 group 228.1.23.4

This example shows how to remove this port from all IP multicast groups:

Switch(config)# interface gigabitethernet0/1
Switch(config-if)# no mvr vlan5 group

This example shows the result if Gigabit Ethernet port 0/2 is not a receiver port:

Switch(config)# interface gigabitethernet0/2
Switch(config-if)# mvr vlan 1 group 230.1.23.4
Interface Gi0/2 not configured as a receiver interface 

You can verify your settings by entering the show mvr members privileged EXEC command.

Related Commands

Command
Description

mvr (global configuration)

Enables and configures multicast VLAN registration on the switch.

show mvr

Displays MVR global parameters or port parameters.

show mvr interface

Displays the configured MVR interfaces or displays the multicast groups to which a receiver port belongs. Also displays all MVR groups of which the interface is a member.

show mvr members

Displays all receiver ports that are members of an MVR multicast group.


pagp learn-method

Use the pagp learn-method interface configuration command to learn the source address of incoming packets received from an EtherChannel port. Use the no form of this command to return to the default setting.

pagp learn-method {aggregation-port | physical-port}

no pagp learn-method

Syntax Description

aggregation-port

Specify address learning on the logical port-channel. The switch sends packets to the source by using any of the interfaces in the EtherChannel. This setting is the default. With aggregate-port learning, it is not important on which physical port the packet arrives.

physical-port

Specify address learning on the physical port within the EtherChannel. The switch sends packets to the source by using the same interface in the EtherChannel from which it learned the source address. The other end of the channel uses the same port in the channel for a particular destination MAC or IP address.


Defaults

The default is aggregation-port (logical port channel).

Command Modes

Interface configuration

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.


Usage Guidelines

The learn method must be configured the same at both ends of the link.


Note The Catalyst 3550 supports address learning only on aggregate ports even though the physical-port keyword is provided in the CLI. The pagp learn-method and the pagp port-priority interface configuration commands have no effect on the switch hardware, but they are required for PAgP interoperability with devices that only support address learning by physical ports, such as the Catalyst 1900 switch.

When the link partner to the Catalyst 3550 switch is a physical learner, we recommend that you configure the switch as a physical-port learner by using the pagp learn-method physical-port interface configuration command and to set the load-distribution method based on the source MAC address by using the port-channel load-balance src-mac global configuration command. Use the pagp learn-method interface configuration command only in this situation.


Examples

This example shows how to set the learning method to learn the address on the physical port within the EtherChannel:

Switch(config-if)# pagp learn-method physical-port

This example shows how to set the learning method to learn the address on the port-channel within the EtherChannel:

Switch(config-if)# pagp learn-method aggregation-port

You can verify your settings by entering the show running-config privileged EXEC command or the show pagp channel-group-number internal privileged EXEC command.

Related Commands

Command
Description

pagp port-priority

Selects an interface over which all traffic through the EtherChannel is sent.

show pagp

Displays PAgP channel-group information.

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
.


pagp port-priority

Use the pagp port-priority interface configuration command to select an interface over which all Port Aggregation Protocol (PAgP) traffic through the EtherChannel is sent. If all unused interfaces in the EtherChannel are in hot-standby mode, they can be placed into operation if the currently selected interface and link fail. Use the no form of this command to return to the default setting.

pagp port-priority priority

no pagp port-priority

Syntax Description

priority

A priority number ranging from 0 to 255.


Defaults

The default value is 128.

Command Modes

Interface configuration

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.


Usage Guidelines

The physical port with the highest priority that is operational and has membership in the same EtherChannel is the one selected for PAgP transmission.


Note The Catalyst 3550 supports address learning only on aggregate ports even though the physical-port keyword is provided in the CLI. The pagp learn-method and the pagp port-priority interface configuration commands have no effect on the switch hardware, but they are required for PAgP interoperability with devices that only support address learning by physical ports, such as the Catalyst 1900 switch.

When the link partner to the Catalyst 3550 switch is a physical learner, we recommend that you configure the switch as a physical-port learner by using the pagp learn-method physical-port interface configuration command and to set the load-distribution method based on the source MAC address by using the port-channel load-balance src-mac global configuration command. Use the pagp learn-method interface configuration command only in this situation.


Examples

This example shows how to set the port priority to 200:

Switch(config-if)# pagp port-priority 200

You can verify your setting by entering the show running-config privileged EXEC command or the show pagp channel-group-number internal privileged EXEC command.

Related Commands

Command
Description

pagp learn-method

Provides the ability to learn the source address of incoming packets.

show pagp

Displays PAgP channel-group information.

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
.


permit

Use the permit MAC-access list configuration command to allow non-IP traffic to be forwarded if the conditions are matched. Use the no form of this command to remove a permit condition from the extended MAC access list.

{permit | deny} {any | host src-MAC-addr | src-MAC-addr mask} {any | host dst-MAC-addr | dst-MAC-addr mask} [type mask | cos cos | aarp | amber | dec-spanning | decnet-iv | diagnostic | dsm | etype-6000 | etype-8042 | lat | lavc-sca | lsap lsap mask | mop-console | mop-dump | msdos | mumps | netbios | vines-echo | vines-ip | xns-idp]

no {permit | deny} {any | host src-MAC-addr | src-MAC-addr mask} {any | host dst-MAC-addr | dst-MAC-addr mask} [type mask | cos cos | aarp | amber | dec-spanning | decnet-iv | diagnostic | dsm | etype-6000 | etype-8042 | lat | lavc-sca | lsap lsap mask | mop-console | mop-dump | msdos | mumps | netbios | vines-echo |vines-ip | xns-idp]


Note Though visible in the command-line help strings, appletalk is not supported as a matching condition, nor is matching on any SNAP-encapsulated packet with a non-zero Organizational Unique Identifier (OUI).


Syntax Description

any

Keyword to specify to deny any source or destination MAC address.

host src-MAC-addr |
src-MAC-addr mask

Define a host MAC address and optional subnet mask. If the source address for a packet matches the defined address, non-IP traffic from that address is denied.

host dst-MAC-addr |
dst-MAC-addr mask

Define a destination MAC address and optional subnet mask. If the destination address for a packet matches the defined address, non-IP traffic to that address is denied.

type mask

(Optional) Use the Ethertype number of a packet with Ethernet II or SNAP encapsulation to identify the protocol of the packet.

type is from 0 to 65535, typically specified in hexadecimal.

mask is a mask of don't care bits applied to the Ethertype before testing for a match.

aarp

(Optional) Select Ethertype AppleTalk Address Resolution Protocol that maps a data-link address to a network address.

amber

(Optional) Select EtherType DEC-Amber.

cos cos

(Optional) Select an arbitrary class of service (CoS) number from 0 to 7 to set priority. Filtering on CoS can be performed only in hardware. A warning message appears if the cos option is configured.

dec-spanning

(Optional) Select EtherType Digital Equipment Corporation (DEC) spanning tree.

decnet-iv

(Optional) Select EtherType DECnet Phase IV protocol.

diagnostic

(Optional) Select EtherType DEC-Diagnostic.

dsm

(Optional) Select EtherType DEC-DSM.

etype-6000

(Optional) Select EtherType 0x6000.

etype-8042

(Optional) Select EtherType 0x8042.

lat

(Optional) Select EtherType DEC-LAT.

lavc-sca

(Optional) Select EtherType DEC-LAVC-SCA.

lsap lsap-number mask

(Optional) Use the LSAP number (from 0 to 65535) of a packet with 802.2 encapsulation to identify the protocol of the packet.

The mask is a mask of don't care bits applied to the LSAP number before testing for a match.

mop-console

(Optional) Select EtherType DEC-MOP Remote Console.

mop-dump

(Optional) Select EtherType DEC-MOP Dump.

msdos

(Optional) Select EtherType DEC-MSDOS.

mumps

(Optional) Select EtherType DEC-MUMPS.

netbios

(Optional) Select EtherType DEC- Network Basic Input/Output System (NETBIOS).

vines-echo

(Optional) Select EtherType Virtual Integrated Network Service (VINES) Echo from Banyan Systems.

vines-ip

(Optional) Select EtherType VINES IP.

xns-idp

(Optional) Select EtherType Xerox Network Systems (XNS) protocol suite.


To filter IPX traffic, you use the type mask or lsap lsap mask keywords, depending on the type of IPX encapsulation being used. Filter criteria for IPX encapsulation types as specified in Novell terminology and Cisco IOS terminology are listed in Table 2-11.

Table 2-11 IPX Filtering Criteria

IPX Encapsulation Type
Filter Criterion
Cisco IOS Name
Novell Name

arpa

Ethernet II

Ethertype 0x8137

snap

Ethernet-snap

Ethertype 0x8137

sap

Ethernet 802.2

LSAP 0xE0E0

novell-ether

Ethernet 802.3

LSAP 0xFFFF


Defaults

This command has no defaults. However; the default action for a MAC-named ACL is to deny.

Command Modes

MAC-access list configuration

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.


Usage Guidelines

You enter MAC-access list configuration mode by using the mac access-list extended global configuration command.

If you use the host keyword, you cannot enter an address mask; if you do not use the any or host keywords, you must enter an address mask.

After an access control entry (ACE) is added to an access control list, an implied deny-any-any condition exists at the end of the list. That is, if there are no matches, the packets are denied. However, before the first ACE is added, the list permits all packets.


Note For more information about MAC named extended access lists, refer to the software configuration guide for this release.


Examples

This example shows how to define the MAC name extended access list to allow NETBIOS traffic from any source to MAC address 00c0.00a0.03fa. Traffic matching this list is allowed.

Switch(config-ext-macl)# permit any host 00c0.00a0.03fa netbios

This example shows how to remove the permit condition from the MAC name extended access list:

Switch(config-ext-macl)# no permit any 00c0.00a0.03fa 0000.0000.0000 netbios

This example permits all packets with Ethertype 0x4321:

Switch(config-ext-macl)# permit any any 0x4321 0

You can verify your settings by entering the show access-lists privileged EXEC command.

Related Commands

Command
Description

deny

Denies non-IP traffic to be forwarded if conditions are matched.

mac access-list extended

Creates an access list based on MAC addresses for non-IP traffic.

show access-lists

Displays access control lists configured on a switch.


police

Use the police policy-map class configuration command to define a policer for classified traffic. Use the no form of this command to remove an existing policer.

police rate-bps burst-byte [exceed-action {drop | policed-dscp-transmit}]

no police rate-bps burst-byte [exceed-action {drop | policed-dscp-transmit}]

Syntax Description

rate-bps

Specify average traffic rate in bits per second (bps). The range is 8000 to 2000000000.

burst-byte

Specify the normal burst size in bytes. The range is 8000 to 512000000.

exceed-action drop

(Optional) When the specified rate is exceeded, specify that the switch drop the packet.

exceed-action policed-dscp-transmit

(Optional) When the specified rate is exceeded, specify that the switch change the Differentiated Services Code Point (DSCP) of the packet to that specified in the policed-DSCP map and then send the packet.


Defaults

No policers are defined.

Command Modes

Policy-map class configuration

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.


Usage Guidelines

You can configure up to 128 policers on ingress Gigabit-capable Ethernet ports.

You can configure up to eight policers on ingress 10/100 Ethernet ports.

You can configure up to eight policers on egress ports.

Although the command-line help strings show a large range of values, the rate-bps option cannot exceed the configured port speed, and the burst-byte option cannot exceed 2000000 bytes. If you enter a larger value, the switch rejects the policy map when you attach it to an interface.

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

Policing uses a token bucket algorithm. You configure the bucket depth (the maximum burst that is tolerated before the bucket overflows) by using the burst-byte option of the police policy-map class configuration command or the mls qos aggregate-policer global configuration command. You configure how quickly (the average rate) the tokens are removed from the bucket by using the rate-bps option of the police policy-map class configuration command or the mls qos aggregate-policer global configuration command. For more information, refer to the software configuration guide for this release.

Examples

This example shows how to configure a policer that drops packets if traffic exceeds a 1-Mbps average rate and a 20-KB burst. The DSCPs of incoming packets are trusted, and there is no packet modification.

Switch(config)# policy-map policy1
Switch(config-pmap)# class class1
Switch(config-pmap-c)# set ip dscp 45
Switch(config-pmap-c)# police 1000000 20000 exceed-action drop
Switch(config-pmap-c)# exit

This example shows how to configure a policer, which marks down the DSCPs with the values defined in policed-DSCP map, and sends the packet:

Switch(config)# policy-map policy2
Switch(config-pmap)# class class2
Switch(config-pmap-c)# police 1000000 20000 exceed-action policed-dscp-transmit
Switch(config-pmap-c)# exit

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

Related Commands

Command
Description

mls qos map policed-dscp

Applies a policed-DSCP map to a DSCP-trusted port.

show policy-map

Displays quality of service (QoS) policy maps.


police aggregate

Use the police aggregate policy-map class configuration command to apply an aggregate policer to multiple classes in the same policy map. Use the no form of this command to remove the specified policer.

police aggregate aggregate-policer-name

no police aggregate aggregate-policer-name

Syntax Description

aggregate-policer-name

Name of the aggregate policer.


Defaults

No aggregate policers are defined.

Command Modes

Policy-map class configuration

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.


Usage Guidelines

You set aggregate policer parameters by using the mls qos aggregate-policer global configuration command.

You can configure up to 128 policers on ingress Gigabit-capable Ethernet ports.

You can configure up to eight policers on ingress 10/100 Ethernet ports.

You can configure up to eight policers on egress ports.

You apply an aggregate policer to multiple classes in the same policy map; you cannot use an aggregate policer across different policy maps or interfaces.

Policy maps that contain per-port per-VLAN classification commands cannot be applied to egress interfaces.

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 define the aggregate policer parameters and apply the policer to multiple classes in a policy map:

Switch(config)# mls qos aggregate-policer agg_policer1 10000 1000000 exceed-action drop
Switch(config)# policy-map policy2
Switch(config-pmap)# class class1
Switch(config-pmap-c)# police aggregate agg_policer1
Switch(config-pmap-c)# exit
Switch(config-pmap)# class class2
Switch(config-pmap-c)# set ip dscp 10
Switch(config-pmap-c)# police aggregate agg_policer1
Switch(config-pmap-c)# exit
Switch(config-pmap)# class class3
Switch(config-pmap-c)# trust dscp
Switch(config-pmap-c)# police aggregate agg_policer2
Switch(config-pmap-c)# exit

You can verify your settings by entering the show mls qos aggregate-policer privileged EXEC command.

Related Commands

Command
Description

mls qos aggregate-policer

Defines policer parameters, which can be shared by multiple classes within a policy map.

show mls qos aggregate-policer

Displays the quality of service (QoS) aggregate policer configuration.


policy-map

Use the policy-map global configuration command to create or modify a policy map that can be attached to multiple interfaces and to enter policy-map configuration mode. Use the no form of this command to delete an existing policy map and return to global configuration mode.

policy-map policy-map-name

no policy-map policy-map-name

Syntax Description

policy-map-name

Name of the policy map.


Defaults

No policy maps are defined.

The default behavior is to set the Differentiated Services Code Point (DSCP) to 0 if the packet is an IP packet and to set the class of service (CoS) to 0 if the packet is tagged. No policing is performed.

Command Modes

Global configuration

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.


Usage Guidelines

Entering the policy-map command enables the policy-map configuration mode. These configuration commands are available:

class: defines the classification match criteria for the specified class map. For more information, see the "class" section.

description: describes the policy map (up to 200 characters).

exit: exits policy-map configuration mode and returns you to global configuration mode.

no: removes a previously defined policy map.

rename: renames the current policy map.

To return to global configuration mode, use the exit command. To return to privileged EXEC mode, use the end command.

Before you can configure policies for classes whose match criteria are defined in a class map, use the policy-map command to specify the name of the policy map to be created, added to, or modified. Entering the policy-map command also enables the policy-map configuration mode in which you can configure or modify the class policies for that policy map.

You can configure class policies in a policy map only if the classes have match criteria defined for them. You use the class-map global configuration and match class-map configuration commands to configure the match criteria for a class. You define packet classification on a physical-port basis and on a per-port per-VLAN basis.

Only one policy map per interface per direction is supported. You can apply the same policy map to multiple interfaces and directions.

Per-port per-VLAN policing is not supported on routed ports or on virtual (logical) interfaces. It is supported only on an ingress port configured as a trunk or as a static-access port.

You cannot use the service-policy interface configuration command to attach policy maps that contain these elements to an egress interface:

set or trust policy-map class configuration commands. Instead, you can use the police policy-map class configuration command to mark down (reduce) the DSCP value at the egress interface.

Access control list (ACL) classification.

Per-port per-VLAN classification.

The only match criterion in a policy map that can be attached to an egress interface is the match ip dscp dscp-list class-map configuration command.

Examples

This example shows how to create a policy map called policy1. When attached to the ingress direction, it matches all the incoming traffic defined in class1, sets the IP DSCP to 10, and polices the traffic at an average rate of 1 Mbps and 20-KB bursts. Traffic exceeding the profile is marked down to a DSCP value obtained from the policed-DSCP map and then sent.

Switch(config)# policy-map policy1
Switch(config-pmap)# class class1
Switch(config-pmap-c)# set ip dscp 10
Switch(config-pmap-c)# police 1000000 20000 exceed-action policed-dscp-transmit
Switch(config-pmap-c)# exit

This example shows how to configure multiple classes in a policy map called policymap2:

Switch(config)# policy-map policymap2
Switch(config-pmap)# class class1
Switch(config-pmap-c)# set ip dscp 10
Switch(config-pmap-c)# police 100000 20000 exceed-action policed-dscp-transmit
Switch(config-pmap-c)# exit
Switch(config-pmap)# class class2
Switch(config-pmap-c)# trust dscp
Switch(config-pmap-c)# police 100000 20000 exceed-action drop
Switch(config-pmap-c)# exit
Switch(config-pmap)# class class3
Switch(config-pmap-c)# set dscp 0 (no policer)
Switch(config-pmap-c)# exit

This example shows how to create a policy map that contains a per-port per-VLAN classification and how to attach it to an ingress interface. A class map, called vlan_class, matches traffic received on VLANs 10, 20 to 30, and 40 that contains IP DSCP 9 (defined in class map dscp_class). If the specified average traffic rates and the burst sizes are exceeded, the switch drops the packet.

Switch(config)# class-map match-any dscp_class
Switch(config-cmap)# match ip dscp 9
Switch(config-cmap)# exit
Switch(config)# class-map match-all vlan_class
Switch(config-cmap)# match vlan 10 20-30 40
Switch(config-cmap)# match class-map dscp_class
Switch(config-cmap)# exit
Switch(config)# policy-map policymap2
Switch(config-pmap)# class vlan_class
Switch(config-pmap-c)# police 80000 8000 exceed-action drop
Switch(config-pmap-c)# exit
Switch(config-pmap)# exit
Switch(config)# interface gigabitethernet0/1
Switch(config-if)# service-policy input policymap2

This example shows how to delete policymap2:

Switch(config)# no policy-map policymap2

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

Related Commands

Command
Description

class

Defines a traffic classification for the policy to act on.

class-map

Creates a class map to be used for matching packets to the class whose name you specify.

police

Defines a policer for classified traffic.

set

Classifies IP traffic by setting a CoS, DSCP, or IP-precedence value in the packet.

show policy-map

Displays quality of service (QoS) policy maps.

trust

Defines a trust state for traffic classified by the class or the class-map command.


port-channel load-balance

Use the port-channel load-balance global configuration command to set the load-distribution method among the ports in the EtherChannel. Use the no form of this command to return to the default setting.

port-channel load-balance {dst-mac | src-mac}

no port-channel load-balance

Syntax Description

dst-mac

Load distribution is based on the destination host MAC address. Packets to the same destination are sent on the same port, but packets to different destinations are sent on different ports in the channel.

src-mac

Load distribution is based on the source MAC address. Packets from different hosts use different ports in the channel, but packets from the same host use the same port.


Defaults

The default is src-mac.

Command Modes

Global configuration

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.


Usage Guidelines

When src-mac is used, load distribution based on the source and destination IP address is also enabled. For all IP traffic being routed, the switch chooses a port for transmission based on the source and destination IP address. Packets between two IP hosts always use the same port for packet transmission, but packets between any other pair of hosts might use a different transmission port.

Examples

This example shows how to set the load-distribution method to dst-mac:

Switch(config)# port-channel load-balance dst-mac

You can verify your setting by entering the show running-config privileged EXEC command or the show etherchannel load-balance privileged EXEC command.

Related Commands

Command
Description

interface port-channel

Accesses or creates the port channel.

show etherchannel

Displays EtherChannel information for a channel.

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
.


power inline

Use the power inline interface configuration command to set the inline-power state on the inline-power-capable interfaces on the Catalyst 3550-24PWR switches.

power inline {auto | never} | [delay {shutdown seconds initial seconds}]


Note This command is available only on the Catalyst 3550-24PWR switches.


Syntax Description

auto

Automatically detect and power inline devices.

never

Disable the detection and power for the inline-power-capable interface.

delay

(Optional) Configure a power shutdown delay time.

shutdown seconds

Configure the time that the switch continues to provide power to the device after linkdown. The range is 0 to 20 seconds.

initial seconds

Configure an initial time that the power shutdown delay is in effect. The range is 0 to 300 seconds.


Defaults

The default for inline-power capable interfaces is auto.

No delay time is configured.

Command Modes

Interface configuration

Command History

Release
Modification

12.1(12c)EA1

This command was first introduced.

12.1(19)EA1

The delay shutdown seconds initial seconds keywords were added.


Usage Guidelines

When using a Cisco Power Device, the delay shutdown command is not needed. Although you can configure a delay shutdown time, it does not take any action on a connected Cisco device.

The delay shutdown command is only recommended for certain IEEE Power Devices that require multiple reloads during initialization. Use the delay shutdown seconds initial seconds keywords to configure the switch to continue providing power during initialization. Without using the delay shutdown command, the switch removes power immediately when linkdown occurs on the connected device.


Caution To avoid product damage, you should not connect any non-IEEE Power Device during the delay shutdown time interval. When the delay shutdown command is active on a port, the port remains powered after unplugging the IEEE Power Device for the configured time interval.

The initial time period begins when the IEEE Power Device is detected by the switch. If linkdown occurs on the connected device during the initial time period, the shutdown time determines how long the switch continues to provide power to the device.

Enter the no power inline delay shutdown seconds initial seconds interface configuration command to return to the default setting.

Examples

This example shows how to disable inline-power detection and power for inline-power-capable interfaces:

Switch(config-if)# power inline never

This example shows how to enable inline-power detection and power for inline-power-capable interfaces:

Switch(config-if)# power inline auto

This example shows how to configure a shutdown time delay for an IEEE Power Device:

Switch(config-if)# power inline delay shutdown 20 initial 90

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

Related Commands

Command
Description

show power inline

Displays the power status for the specified port or for all ports.


priority-queue

Use the priority-queue interface configuration command to enable the egress expedite queue on a Gigabit-capable or a 10/100 Ethernet interface. Use the no form of this command to return to the default setting.

priority-queue out

no priority-queue out

Syntax Description

out

Enable the egress expedite queue.


Defaults

The egress expedite queue is disabled.

Command Modes

Interface configuration

Command History

Release
Modification

12.1(6)EA1

This command was first introduced.


Usage Guidelines

When you configure the priority-queue out command, the weighted round robin (WRR) weight ratios are affected because there is one fewer queue participating in WRR. This means that weight4 in the wrr-queue bandwidth interface configuration command is ignored (not used in the ratio calculation). The expedite queue is a priority queue, and it is serviced until empty before the other queues are serviced.

Examples

This example shows how to enable the egress expedite queue:

Switch(config)# interface gigabitethernet0/1
Switch(config-if)# priority-queue out

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

Related Commands

Command
Description

show mls qos interface queueing

Displays the queueing strategy (WRR, priority queueing), the weights corresponding to the queues, and the CoS-to-egress-queue map.


rcommand

Use the rcommand user EXEC command to start a Telnet session and to execute commands on a member switch from the command switch. To end the session, enter the exit command.

rcommand {n | commander | mac-address hw-addr}

Syntax Description

n

Provide the number that identifies a cluster member. The range is from 0 to 15.

commander

Provide access to the command switch from a member switch.

mac-address hw-addr

MAC address of the member switch.


Command Modes

User EXEC

Command History

Release
Modification

12.1(4)EA1

This command was first introduced.


Usage Guidelines

If the switch is the command switch but the member switch n does not exist, an error message appears. To obtain the switch number, enter the show cluster members privileged EXEC command on the command switch.

You can use this command to access a member switch from the command-switch prompt or to access a command switch from the member-switch prompt.

For Catalyst 2900 XL, 3500 XL, 2950, and 3550 switches, the Telnet session accesses the member-switch command-line interface (CLI) at the same privilege level as on the command switch. For example, if you execute this command at user level on the cluster command switch, the member switch is accessed at user level. If you use this command on the command switch at privileged level, the command accesses the remote device at privileged level. If you use an intermediate enable-level lower than privileged, access to the member switch is at user level.

For Catalyst 1900 and 2820 switches running standard edition software, the Telnet session accesses the menu console (the menu-driven interface) if the command switch is at privilege level 15. If the command switch is at privilege level 1, you are prompted for the password before being able to access the menu console. Command switch privilege levels map to the member switches running standard edition software as follows:

If the command switch privilege level is from 1 to 14, the member switch is accessed at privilege level 1.

If the command switch privilege level is 15, the member switch is accessed at privilege level 15.

The Catalyst 1900 and 2820 CLI is available only on switches running Enterprise Edition Software.

This command will not work if the vty lines of the command switch have access-class configurations.

You are not prompted for a password because the member switches inherited the password of the command switch when they joined the cluster.

Examples

This example shows how to start a session with member 3. All subsequent commands are directed to member 3 until you enter the exit command or close the session.

Switch# rcommand 3
Switch-3# show version
Cisco Internet Operating System Software ...
...
Switch-3# exit
Switch#

Related Commands

Command
Description

show cluster members

Displays information about the cluster members.


remote-span

Use the remote-span VLAN configuration command to add the Remote Switched Port Analyzer (RSPAN) feature to a VLAN. Use the no form of this command to remove the RSPAN feature from the VLAN.

remote-span

no remote-span

Syntax Description

This command has no arguments or keywords.

Defaults

No RSPAN VLANs are defined.

Command Modes

VLAN configuration

Command History

Release
Modification

12.1(11)EA1

This command was first introduced.


Usage Guidelines

When a VLAN is converted from a normal VLAN to an RSPAN VLAN (or the reverse), the VLAN is first deleted and is then recreated with the new configuration. If VTP is enabled, the RSPAN feature is propagated by VLAN Trunking Protocol (VTP) for VLAN-IDs that are lower than 1024.

Before you configure the RSPAN remote-span feature, use the vlan (global configuration) command to create the VLAN.

Examples

This example shows how to configure an RSPAN VLAN.

Switch(config)# vlan 901
Switch(config-vlan)# remote-span

This example shows how to remove the RSPAN feature from a VLAN.

Switch(config)# vlan 901
Switch(config-vlan)# no remote-span

You can verify your settings by entering the show vlan user EXEC command.

Related Commands

Command
Description

monitor session

Enables Switched Port Analyzer (SPAN) and RSPAN monitoring on a port and configures a port as a source or destination port.

vlan (global configuration)

Changes to config-vlan mode where you can configure VLANs 1 to 4094; do not enter leading zeros.


rmon collection stats

Use the rmon collection stats interface configuration command to collect Ethernet group statistics, which include utilization statistics about broadcast and multicast packets, and error statistics about Cyclic Redundancy Check (CRC) alignment errors and collisions. Use the no form of this command to return to the default setting.

rmon collection stats index [owner name]

no rmon collection stats index [owner name]

Syntax Description

index