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Table Of Contents
clear mac-address-table dynamic
deny (access-list configuration)
deny (MAC access-list configuration)
ip igmp snooping vlan immediate-leave
mac-address-table notification
match (class-map configuration)
permit (access-list configuration)
permit (MAC access-list configuration)
show mac-address-table multicast
show mac-address-table notification
snmp-server enable traps mac-notification
snmp-server enable traps vlan-membership
spanning-tree portfast bpduguard
udld (interface configuration)
vmps reconfirm (global configuration)
vmps reconfirm (privileged EXEC)
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} method1 [method2...]
Syntax Description
Defaults
No authentication is performed.
Command Modes
Global configuration
Command History
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 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 modelSwitch(config)# aaa authentication dot1x default group radius noneYou can verify your settings by entering the show running-config privileged EXEC command.
Related Commands
abort
Use the abort VLAN configuration command to abandon the proposed VLAN configuration, exit VLAN configuration mode, and return to privileged EXEC mode.
abort
Syntax Description
This command has no arguments or keywords.
Defaults
No default is defined.
Command Modes
VLAN configuration
Command History
12.0(5.2)WC(1)
This command was first introduced.
12.1(6)EA2
The command mode was changed from VLAN database to VLAN configuration.
Usage Guidelines
If you have added, deleted, or modified VLAN parameters in VLAN configuration mode but you do not want to keep the changes, the abort command causes all the changes to be abandoned. The VLAN configuration that was running before you entered VLAN configuration mode continues to be used.
Examples
This example shows how to abandon the proposed VLAN configuration and exit to the privileged EXEC mode:
Switch(vlan)# abortSwitch#You can verify that no VLAN configuration changes occurred by entering the show vlan brief privileged EXEC command.
Related Commands
access-list (IP extended)
Use the extended version of the access-list global configuration command to configure an extended IP access control list (ACL). Use the no form of the command to remove an extended IP ACL.
access-list access-list-number {deny | permit | remark} protocol {source source-wildcard | host source | any} [operator port] {destination destination-wildcard | host destination | any} [operator port]
no access-list access-list-number
This command is available on physical interfaces only if your switch is running the enhanced software image.
Syntax Description
Defaults
The default extended ACL is always terminated by an implicit deny statement for all packets.
Command Modes
Global configuration
Command History
12.1(6)EA2
This command was first introduced.
12.1(6)EA2b
This command is supported only by the enhanced software image.
Usage Guidelines
Plan your access conditions carefully. The ACL is always terminated by an implicit deny statement for all packets.
You can use ACLs to control virtual terminal line access by controlling the transmission of packets on an interface.
Extended ACLs support only the TCP and UDP protocols.
Use the show ip access-lists command to display the contents of IP ACLs.
Use the show access-lists command to display the contents of all ACLs.
Note
For more information about configuring IP ACLs, refer to the "Configuring Network Security with ACLs" chapter in the Catalyst 2950 Desktop Switch Software Configuration Guide for this release.
Examples
This example shows how to configure an extended IP ACL that allows only TCP traffic to the destination IP address 128.88.1.2 with a TCP port number of 25 and how to apply it to an interface:
Switch(config)# access-list 102 permit tcp any host 128.88.1.2 eq 25Switch(config)# interface fastethernet0/8Switch(config-if)# ip access-group 102 inThis is an example of an extended ACL that allows TCP traffic only from two specified networks. The wildcard bits apply to the host portions of the network addresses. Any host with a source address that does not match the ACL statements is denied.
access-list 104 permit tcp 192.5.0.0 0.0.255.255 anyaccess-list 104 permit tcp 128.88.0.0 0.0.255.255 any
Note
You can verify your settings by entering the show ip access-lists or show access-lists privileged EXEC command.
Related Commands
Configures a standard IP ACL.
Controls access to an interface.
Displays IP ACLs configured on the switch.
Displays ACLs configured on the switch.
access-list (IP standard)
Use the standard version of the access-list global configuration command to configure a standard IP access control list (ACL). Use the no form of the command to remove a standard IP ACL.
access-list access-list-number {deny | permit | remark} {source source-wildcard | host source | any}
no access-list access-list-number
This command is available on physical interfaces only if your switch is running the enhanced software image.
Syntax Description
Defaults
The default standard ACL is always terminated by an implicit deny statement for all packets.
Command Modes
Global configuration
Command History
12.1(6)EA2
This command was first introduced.
12.1(6)EA2b
This command is supported only by the enhanced software image.
Usage Guidelines
Plan your access conditions carefully. The ACL is always terminated by an implicit deny statement for all packets.
You can use ACLs to control virtual terminal line access by controlling the transmission of packets on an interface.
Use the show ip access-lists to display the contents of IP ACLs.
Use the show access-lists command to display the contents of all ACLs.
Note
Examples
This example shows how to configure a standard IP ACL that allows only traffic from the host network 128.88.1.10 and how to apply it to an interface:
Switch(config)# access-list 12 permit host 128.88.1.10Switch(config)# interface gigabitethernet0/1Switch(config-if)# ip access-group 12 inThis is an example of an standard ACL that allows traffic only from three specified networks. The wildcard bits apply to the host portions of the network addresses. Any host with a source address that does not match the ACL statements is denied.
access-list 14 permit 192.5.34.0 0.0.0.255access-list 14 permit 128.88.0.0 0.0.0.255access-list 14 permit 36.1.1.0 0.0.0.255
Note
You can verify your settings by entering the show ip access-lists or show access-lists privileged EXEC command.
Related Commands
Configures an extended IP ACL.
Controls access to an interface.
Displays IP ACLs configured on the switch.
Displays ACLs configured on the switch.
apply
Use the apply VLAN configuration command to implement the proposed VLAN configuration, increment the database configuration revision number, propagate it throughout the administrative domain, and remain in VLAN configuration mode.
apply
Syntax Description
This command has no arguments or keywords.
Defaults
No default is defined.
Command Modes
VLAN configuration
Command History
12.0(5.2)WC(1)
This command was first introduced.
12.1(6)EA2
The command mode was changed from VLAN database to VLAN configuration.
Usage Guidelines
The apply command implements the configuration changes that you made after you entered VLAN configuration mode and uses them for the running configuration. The switch remains in VLAN configuration mode.
You cannot use this command when the switch is in the VLAN Trunking Protocol (VTP) client mode.
Examples
This example shows how to implement the proposed VLAN configuration as the current configuration:
Switch(vlan)# applyYou can verify your settings by entering the show vlan privileged EXEC command.
Related Commands
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}
no channel-group
Syntax Description
Defaults
No channel groups are assigned.
There is no default mode.
Command Modes
Interface configuration
Command History
12.1(6)EA2
This command was first introduced. It replaced the port group command.
Usage Guidelines
You must specify the mode when entering this command. If the mode is not entered, an Ethernet interface is not assigned to an EtherChannel group, and an error message appears.
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.
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.
You can create port channels by entering the interface port-channel global configuration command or when the channel group gets its first physical interface assignment. The port channels are not created at runtime or dynamically.
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).
With the on mode, a usable EtherChannel exists only when a port group in on mode is connected to another port group in on mode.
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, transmits 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.
Caution
Examples
This example shows how to add an interface to the EtherChannel group specified as channel group 1:
Switch(config)# interface gigabitethernet0/1Switch(config-if)# channel-group 1 mode onYou can verify your settings by entering the show etherchannel or show running-config privileged EXEC command.
Related Commands
class
Use the class policy-map configuration command to define a traffic classification for the policy to act on using the class-map name or access group. Use the no form of this command to delete an existing class map.
class class-map-name [access-group acl-index-or-name]
no class class-map-name
This command is available only if your switch is running the enhanced software image.
Syntax Description
Defaults
No policy-map class maps are defined.
Command Modes
Policy-map configuration
Command History
12.1(6)EA2
This command was first introduced.
12.1(6)EA2b
This command is supported only by the enhanced software image.
Usage Guidelines
Before you use the class command, use the policy-map global configuration command to identify the policy map and to enter policy-map configuration mode. 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; however, you cannot attach one that uses an ACL classification to the egress direction.
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.
Note
After entering the class command, you enter policy-map class configuration mode. These configuration commands are available:
•
•
•
•
•
To return to policy-map configuration mode, use the exit command. To return to privileged EXEC mode, use the end command.
Note
Examples
This example shows how to create a policy map named policy1. When attached to the ingress port, it matches all the incoming traffic defined in class1 and polices the traffic at an average rate of 1 Mbps and bursts at 131072 bytes. Traffic exceeding the profile is dropped.
Switch(config)# policy-map policy1Switch(config-pmap)# class class1Switch(config-pmap-c)# police 1000000 131072 exceed-action dropSwitch(config-pmap-c)# exitSwitch(config-pmap)#You can verify your settings by entering the show policy-map privileged EXEC command.
Related Commands
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 to return to global configuration mode.
class-map class-map-name
no class-map class-map-name
This command is available only if your switch is running the enhanced software image.
Syntax Description
Defaults
No class maps are defined.
Command Modes
Global configuration
Command History
12.1(6)EA2
This command was first introduced.
12.1(6)EA2b
This command is supported only by the enhanced software image.
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. In this mode, you can enter one match command to configure the match criteria for this class.
The class-map command and its subcommands are used to define packet classification and marking as part of a globally named service policy applied on a per-interface basis.
In quality of service (QoS) class-map configuration mode, these configuration commands are available:
•
•
•
Only one match criteria per class map is supported. For example, when defining a class map, only one match command can be entered.
Only one access control list (ACL) can be configured in a class map. The ACL can have multiple access control entries (ACEs).
Note
Note
Examples
This example shows how to configure the class map named class1. class1 has one match criteria, which is a numbered ACL.
Switch(config)# access-list 103 permit tcp any any eq 80Switch(config)# class-map class1Switch(config-cmap)# match access-group 103Switch(config-cmap)# exitYou can verify your settings by entering the show class-map privileged EXEC command.
Related Commands
clear interface
Use the clear interface privileged EXEC command to clear the hardware logic on an interface or a VLAN.
clear interface {interface-id | vlan vlan-id}
Syntax Description
interface-id
ID of the interface.
vlan-id
VLAN ID value. Valid VLAN IDs are from 1 to 1001; do not enter leading zeroes.
Defaults
No default is defined.
Command Modes
Privileged EXEC
Command History
Examples
This example shows how to clear the hardware logic on a Gigabit Ethernet interface:
Switch# clear interface gigabitethernet0/1This example shows how to clear the hardware logic on a specific VLAN:
Switch# clear interface vlan 5You can verify that the interface-reset counter for an interface is incremented by entering the show interface privileged EXEC command.
clear mac-address-table dynamic
Use the clear mac-address-table dynamic 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.
clear mac-address-table dynamic [address mac-addr | interface interface-id | vlan vlan-id]
Syntax Description
Defaults
No default is defined.
Command Modes
Privileged EXEC
Command History
Examples
This example shows how to remove a specific dynamic address from the MAC address table:
Switch# clear mac-address-table dynamic address 0008.0070.0007You can verify that the information was deleted by entering the show mac-address-table privileged EXEC command.
Related Commands
clear pagp
Use the clear pagp privileged EXEC command to clear Port Aggregation Protocol (PAgP) channel-group information.
clear pagp {channel-group-number | counters}
Syntax Description
Defaults
This command has no default setting.
Command Modes
Privileged EXEC
Command History
Examples
This example shows how to clear channel-group information for a specific group:
Switch# clear pagp 4This example shows how to clear channel-group traffic counters:
Switch# clear pagp countersYou can verify that the information was deleted by entering the show pagp privileged EXEC command.
Related Commands
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
Examples
This example shows how to clear VLAN Membership Policy Server (VMPS) statistics:
Switch# clear vmps statisticsYou can verify that the information was deleted by entering the show vmps statistics privileged EXEC command.
Related Commands
show vmps statistics
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
Examples
This example shows how to clear the VTP counters:
Switch# clear vtp countersYou can verify that the information was deleted by entering the show vtp counters privileged EXEC command.
Related Commands
show vtp counters
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. Enter the no form of this global configuration 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
Defaults
The switch is not a member of any cluster.
Command Modes
Global configuration
Command History
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 an example of text 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 terminalEnter configuration commands, one per line. End with CNTL/Z.Switch(config)# no cluster commander-addressYou can verify your settings by entering the show cluster user EXEC command.
Related Commands
Displays the cluster status and a summary of the cluster to which the switch belongs.
show running-config
Displays the running configuration on the switch.
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 set the hop count to the default value.
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
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 entered on the command switch.
Switch(config)# cluster discovery hop-count 4You can verify your settings by entering the show cluster user EXEC command on the command switch.
Related Commands
Displays the cluster status and a summary of the cluster to which the switch belongs.
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 optionally assign a member number to it. Use the no form of the command to remove all members and make the command switch a candidate switch.
cluster enable name [command-switch-member-number]
no cluster enable
Syntax Description
Defaults
The switch is not a command switch.
No cluster name is defined.
The member number is 0 when this is the command switch.
Command Modes
Global configuration
Command History
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 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 4You can verify your settings by entering the show cluster user EXEC command on the command switch.
Related Commands
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 holdtime is 80 seconds.
Command Modes
Global configuration
Command History
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 of the cluster members.
The holdtime is typically set as a multiple of the interval timer (cluster timer). For example, it takes (holdtime-in-secs divided by 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 3Switch(config)# cluster holdtime 30You can verify your settings by entering the show cluster user EXEC command.
Related Commands
Displays the cluster status and a summary of the cluster to which the switch belongs.
cluster management-vlan
Use the cluster management-vlan global configuration command on the command switch to change the management VLAN for the entire cluster. Use the no form of this command to change the management VLAN to VLAN 1.
cluster management-vlan n
no cluster management-vlan
Syntax Description
n
VLAN ID of the new management VLAN. Valid VLAN IDs are from 1 to 1001. Do not enter leading zeroes.
Defaults
The default management VLAN is VLAN 1.
Command Modes
Global configuration
Command History
Usage Guidelines
Enter this command only on the command switch.
This command is not written to the configuration file.
Examples
This example shows how to change the management VLAN to VLAN 5 on the entire cluster:
Switch(config)# cluster management-vlan 5You can verify your settings by entering the show interface vlan number privileged EXEC command.
Related Commands
Displays the administrative and operational status of a switching (nonrouting) port.
cluster member
Use the cluster member global configuration command on the command switch to add members to a cluster. Use the no form of the command to remove members from the cluster.
cluster member [n] mac-address H.H.H [password enable-password]
no cluster member n
Syntax Description
Defaults
A newly enabled command switch has no associated cluster members.
Command Modes
Global configuration
Command History
Usage Guidelines
Enter this command only on the command switch to add a member to or remove a member from the cluster. If a switch is not commanding a cluster, an error message appears.
You do not need to enter a member number. The command switch selects the next available member number and assigns it to the switch 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.
Examples
This example shows how to add a switch as member 2 with MAC address 00E0.1E00.2222 and the password grandkey to a cluster:
Switch(config)# cluster member 2 mac-address 00E0.1E00.2222 password grandkeyThis example shows how to add a switch with MAC address 00E0.1E00.3333 to the cluster. The command switch selects the next available member number and assigns it to the switch joining the cluster:
Switch(config)# cluster member mac-address 00E0.1E00.3333You can verify your settings by entering the show cluster members user EXEC command on the command switch.
Related Commands
Displays the cluster status and a summary of the cluster to which the switch belongs.
Displays a list of candidate switches.
Displays information about the cluster members.
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
Defaults
Clustering is enabled on all switches.
Command Modes
Global configuration
Command History
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 cannot become 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 cannot become 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 runYou can verify that clustering is disabled by entering the show cluster user EXEC command.
Related Commands
Displays the cluster status and a summary of the cluster to which the switch belongs.
cluster setup
Use the cluster setup privileged EXEC command on the command switch to automatically build a cluster.
cluster setup
Syntax Description
This command has no arguments or keywords.
Defaults
No default is defined.
Command Modes
Privileged EXEC
Command History
Usage Guidelines
You can use the cluster setup command to add new switches to an existing cluster. The cluster setup command provides a high-level view of the configuration and guides you through the configuration change process. You can only see candidate switches that are one hop away from the command switch and have no IP address. To see devices farther away, use the show cluster members or show cluster candidates privileged EXEC command.
If a candidate switch has a password, this information is not passed to the cluster.
Examples
This is an example of the cluster setup command output:
Switch# cluster setup--- Cluster Configuration Dialog ---At any point you may enter a question mark '?' for help.Use ctrl-c to abort configuration dialog at any prompt.Default settings are in square brackets '[]'.This switch is already configured as cluster command switch:Command Switch Name:clus1, contains 1 membersContinue with cluster configuration dialog? [yes/no]:yesThe suggested Cluster configuration is as follows:|---Upstream---|SN MAC Address Name PortIf FEC Hops SN PortIf FEC State0 0030.0002.0240 c2950-1 0 Up (Cmdr)1* 0001.96e4.e580 c2950-2 Fa0/1 1 0 Fa0/9 Up2* 0001.96e4.e580 c2950-2 Fa0/3 1 0 Fa0/3 Up3* 0001.96e4.e580 c2950-2 Fa0/5 1 0 Fa0/5 Up4* 0050.2ae6.2e00 2900-1 Fa0/1 1 0 Fa0/1 UpThe following configuration command script was created:cluster member 1 mac-address 0001.96e4.e580cluster member 2 mac-address 0001.96e4.e580cluster member 3 mac-address 0001.96e4.e580cluster member 4 mac-address 0050.2ae6.2e00!endUse this configuration? [yes/no]:yesBuilding configuration...[OK]Use the enabled mode 'configure' command to modify this configuration.Switch#You can verify your settings by entering the show cluster user EXEC command.
Related Commands
cluster standby-group
Use the cluster standby-group global configuration command to enable command switch redundancy by binding the Hot Standby Router Protocol (HSRP) standby group to the cluster. Use the no form of this command to unbind the cluster from the HSRP standby group.
cluster standby-group HSRP-group-name
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.
Defaults
The cluster is not bound to any HSRP group.
Command Modes
Global configuration
Command History
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 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 entry produces an error.
Use the same group name on all members of the HSRP standby group that is to be bound to the cluster. Use the same HSRP group name 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 on the cluster command and the member switches.)
Examples
This example shows how to bind the HSRP group named my_hsrp to the cluster. This command is entered on the command switch.
Switch(config)# cluster standby-group my_hsrpThis example shows the error message when this command is entered on a command switch and the specified HSRP standby group does not exist:
Switch(config)# cluster standby-group my_hsrp%ERROR: Standby group `my_hsrp' doesn't existThis example shows the error message when this command is entered on a member switch:
Switch(config)# cluster standby-group my_hsrp%ERROR: This command runs only on the command switchYou can verify your settings by entering the show cluster user EXEC command.
Related Commands
standby ip
Enables HSRP on the interface.
Displays the cluster status and a summary of the cluster to which the switch belongs.
show standby
Displays standby group information.
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
Defaults
The interval is 8 seconds.
Command Modes
Global configuration
Command History
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.
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 3Switch(config)# cluster holdtime 30You can verify your settings by entering the show cluster user EXEC command.
Related Commands
Displays the cluster status and a summary of the cluster to which the switch belongs.
delete
Use the delete privileged EXEC command to delete a file from the file system.
delete {device:}filename
Syntax Description
device:
Device containing the file to be deleted. Valid devices include the switch Flash memory.
filename
Name of file.
Command Modes
Privileged EXEC
Command History
Usage Guidelines
A colon (:) follows the device variable. Do not enter spaces after the colon.
Examples
This example shows how to delete a file from the switch Flash memory:
Switch# delete flash:filenameYou can verify that the directory was removed by entering the dir filesystem: privileged EXEC command.
Related Commands
deny (access-list configuration)
Use the deny access-list configuration command to configure conditions for a named or numbered IP access control list (ACL). Use the no form of the command to remove a deny condition from the IP ACL.
Use these commands with standard IP ACLs:
deny {source source-wildcard | host source | any}
no deny {source source-wildcard | host source | any}
Use these commands with extended IP ACLs:
deny protocol {source source-wildcard | host source | any} [operator port] {destination destination-wildcard | host source | any} [operator port]
no deny protocol {source source-wildcard | host source | any} [operator port] {destination destination-wildcard | host source | any} [operator port]
This command is available on physical interfaces only if your switch is running the enhanced software image.
Syntax Description
Defaults
There are no specific conditions that deny packets in the named or numbered IP ACL.
The default ACL is always terminated by an implicit deny statement for all packets.
Command Modes
Access-list configuration
Command History
12.1(6)EA2
This command was first introduced.
12.1(6)EA2b
This command is supported only by the enhanced software image.
Usage Guidelines
Use this command after the ip access-list global configuration command to specify deny conditions for an IP ACL. You can specify a source IP address, destination IP address, IP protocol, TCP port, or UDP port. Specify the TCP and UDP port numbers only if protocol is tcp or udp and operator is eq.
Note
Examples
This example shows how to create an extended IP ACL and to configure deny conditions for it:
Switch(config)# ip access-list extended InternetfilterSwitch(config-ext-nacl)# deny tcp host 190.5.88.10 anySwitch(config-ext-nacl)# deny tcp host 192.1.10.10 anyThis is an example of a standard ACL that sets a deny conditions:
ip access-list standard Acclist1deny 192.5.34.0 0.0.0.255deny 128.88.10.0 0.0.0.255deny 36.1.1.0 0.0.0.255
Note
You can verify your settings by entering the show ip access-lists or show access-lists privileged EXEC command.
Related Commands
Defines an IP ACL.
Sets conditions for an IP ACL.
Controls access to an interface.
Displays IP ACLs configured on the switch.
Displays ACLs configured on a switch.
deny (MAC access-list configuration)
Use the deny MAC access-list configuration command to prevent Layer 2 traffic from being forwarded if the conditions are matched. Use the no form of the command to remove a deny condition from the MAC named access control list (ACL).
{permit | deny} {any | host src-MAC-addr} {any | host dst-MAC-addr} [aarp | amber | dec-spanning | decnet-iv | diagnostic | dsm | etype-6000 | etype-8042 | lat | lavc-sca | mop-console | mop-dump | msdos | mumps | netbios | vines-echo |vines-ip | xns-idp]
no {permit | deny} {any | host src-MAC-addr} {any | host dst-MAC-addr} [aarp | amber | dec-spanning | decnet-iv | diagnostic | dsm | etype-6000 | etype-8042 | lat | lavc-sca | mop-console | mop-dump | msdos | mumps | netbios | vines-echo |vines-ip | xns-idp]
This command is available only if your switch is running the enhanced software image.
Syntax Description
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
12.1(6)EA2
This command was first introduced.
12.1(6)EA2b
This command is supported only by the enhanced software image.
Usage Guidelines
When an access control entry (ACE) is added to an ACL, 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.
These options are not allowed:
•
•
•
Note
Examples
This example shows how to define the MAC named extended ACL 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 netbiosThis example shows how to remove the deny condition from the named MAC extended ACL:
Switch(config-ext-macl)# no deny any host 00c0.00a0.03fa netbiosYou can verify your settings by entering the show access-lists privileged EXEC command.
Related Commands
Creates an ACL based on MAC addresses for non-IP traffic.
Permits Layer 2 traffic to be forwarded if conditions are matched.
Displays ACLs configured on a switch.
dot1x default
Use the dot1x default global configuration command to reset the global 802.1X parameters to their default values.
dot1x default
Syntax Description
This command has no arguments or keywords.
Defaults
This command has no default setting.
Command Modes
Global configuration
Command History
Examples
This example shows how to reset the global 802.1X parameters:
Switch(config)# dot1x defaultYou can verify your settings by entering the show dot1x privileged EXEC command.
Related Commands
dot1x max-req
Use the dot1x max-req global 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) 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/identify frame before restarting the authentication process. The range is 1 to 10.
Defaults
The default is 2 times.
Command Modes
Global configuration
Command History
Usage Guidelines
You should change the default value of this command only to adjust for unusual circumstances such as unreliable links or specific behavorial problems with certain clients and authentication servers.
Examples
This example shows how to set the number of times that the switch sends an EAP-request/identity frame to 5 before restarting the authentication process:
Switch(config)# dot1x max-req 5You can verify your settings by entering the show dot1x privileged EXEC command.
Related Commands
dot1x multiple-hosts
Use the dot1x multiple-hosts interface configuration command to allow multiple hosts (clients) 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 multiple-hosts
no dot1x multiple-hosts
Syntax Description
This command has no arguments or keywords.
Defaults
Multiple hosts are disabled.
Command Modes
Interface configuration
Command History
Usage Guidelines
This command enables you to attach multiple clients to a single 802.1X-enabled port. In this 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.
Examples
This example shows how to enable 802.1X on Fast Ethernet interface 0/1 and to allow multiple hosts:
Switch(config)# interface fastethernet0/1Switch(config-if)# dot1x port-control autoSwitch(config-if)# dot1x multiple-hostsYou can verify your settings by entering the show dot1x [interface interface-id] privileged EXEC command.
Related Commands
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 Descriptionn
Defaults
The authorization state is force-authorized.
Command Modes
Interface configuration
Command History
Usage Guidelines
The 802.1X protocol is supported on Layer 2 static-access ports.
You can use the auto keyword only if the port is not configured as one of these:
•
•
•
•
•
•
To globally disable 802.1X on the switch, you must disable it on each port. There is no global configuration command for this task.
Examples
This example shows how to enable 802.1X on Fast Ethernet interface 0/1:
Switch(config)# interface fastethernet0/1Switch(config-if)# dot1x port-control autoYou can verify your settings by entering the show dot1x privileged EXEC command and checking the Status column in the 802.1X Port Summary section of the display. An enabled status means the port-control value is set either to auto or to force-unauthorized.
Related Commands
Displays 802.1X statistics, administrative status, and operational status for the switch or 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
Defaults
There is no default setting.
Command Modes
Privileged EXEC
Command History
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 fastethernet0/1Starting reauthentication on FastEthernet0/1.You can verify your settings by entering the show dot1x privileged EXEC command.
dot1x re-authentication
Use the dot1x re-authentication global configuration command to enable periodic re-authentication of the client. Use the no form of this command to return to the default setting.
dot1x re-authentication
no dot1x re-authentication
Syntax Description
This command has no arguments or keywords.
Defaults
Periodic re-authentication is disabled.
Command Modes
Global configuration
Command History
Usage Guidelines
You configure the amount of time between periodic re-authentication attempts by using the dot1x timeout re-authperiod global configuration command.
Examples
This example shows how to disable periodic re-authentication of the client:
Switch(config)# no dot1x re-authenticationThis example shows how to enable periodic re-authentication and set the number of seconds between re-authentication attempts to 4000 seconds:
Switch(config)# dot1x re-authenticationSwitch(config)# dot1x timeout re-authperiod 4000You can verify your settings by entering the show dot1x privileged EXEC command.
Related Commands
dot1x timeout quiet-period
Use the dot1x quiet-period global configuration command to set the number of seconds that the switch remains in the quiet state following a failed authentication exchange (for example, the client provided an invalid password). Use the no form of this command to return to the default setting.
dot1x timeout quiet-period seconds
no dot1x timeout quiet-period
Syntax Description
seconds
Time in seconds that the switch remains in the quiet state following a failed authentication exchange with the client. The range is 0 to 65535 seconds.
Defaults
The default time is 60 seconds.
Command Modes
Global configuration
Command History
Usage Guidelines
During the quiet period, the switch does not accept or initiate any authentication requests.
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.
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 set the quiet time on the switch to 30 seconds:
Switch(config)# dot1x timeout quiet-period 30You can verify your settings by entering the show dot1x privileged EXEC command.
Related Commands
Displays 802.1X statistics, administrative status, and operational status for the switch or for the specified interface.
dot1x timeout re-authperiod
Use the dot1x timeout re-authperiod global configuration command to set the number of seconds between re-authentication attempts. Use the no form of this command to return to the default setting.
dot1x timeout re-authperiod seconds
no dot1x timeout re-authperiod
Syntax Description
Defaults
The default is 3600 seconds.
Command Modes
Global configuration
Command History
Usage Guidelines
The dot1x timeout re-authperiod global configuration command affects the behavior of the switch only if you have enabled periodic re-authentication by using the dot1x re-authentication global configuration command.
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 or authentication servers.
Examples
This example shows how to enable periodic re-authentication and set the number of seconds between re-authentication attempts to 4000 seconds:
Switch(config)# dot1x re-authenticationSwitch(config)# dot1x timeout re-authperiod 4000You can verify your settings by entering the show dot1x privileged EXEC command.
Related Commands
Enables periodic re-authentication of the client.
Displays 802.1X statistics, administrative status, and operational status for the switch or for the specified interface.
dot1x timeout tx-period
Use the dot1x timeout tx-period global configuration command to set the number of seconds that the switch waits for a response to an Extensible Authentication Protocol (EAP)-request /identity frame from the client before retransmitting the request. Use the no form of this command to return to the default setting.
dot1x timeout tx-period seconds
no dot1x timeout tx-period
Syntax Description
seconds
Time in seconds that the switch should wait for a response to an EAP-request/identity frame from the client before retransmitting the request. The range is 1 to 65535 seconds.
Defaults
The default is 30 seconds.
Command Modes
Global configuration
Command History
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 or authentication servers.
Examples
This example shows how to set 60 as the number of seconds that the switch waits for a response to an EAP-request/identity frame from the client before retransmitting the request:
Switch(config)# dot1x timeout tx-period 60You can verify your settings by entering the show dot1x privileged EXEC command.
Related Commands
duplex
Use the duplex interface configuration command to specify the duplex mode of operation for switch ports. Use the no form of this command to return the port to its default value.
duplex {full | half | auto}
no duplex
Syntax Description
full
Port is in full-duplex mode.
half
Port is in half-duplex mode.
auto
Port automatically detects whether it should run in full- or half-duplex mode.
Defaults
For Fast Ethernet and 10/100/1000 ports, the default is auto.
For 100BASE-FX ports, the default is full.
For the default duplex mode of the Gigabit Interface Converter (GBIC)-module ports, refer to the documentation that came with your GBIC module.
Command Modes
Interface configuration
Command History
12.0(5.2)WC(1)
This command was first introduced.
12.1(6)EA2
The usage guidelines for the Catalyst 2950C-24 switch were modified.
Usage Guidelines
Certain ports, such as GBIC-module ports, can be configured to be either full duplex or half duplex. The applicability of this command depends on the device to which the switch is attached.
The 100BASE-FX ports on Catalyst 2950C-24 switches do not support the duplex command. These ports only operate in full-duplex and 100-Mbps mode.
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.
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.
Note
If both the speed and duplex are set to specific values, autonegotiation is disabled.
Note
Examples
This example shows how to set a Fast Ethernet port to half duplex:
Switch(config)# interface fastethernet0/11Switch(config-if)# duplex halfThis example shows how to set a Gigabit Ethernet port to full duplex:
Switch(config)# interface gigabitethernet0/1Switch(config-if)# duplex fullYou can verify your settings by entering the show running-config privileged EXEC command.
Related Commands
show running-config
Displays the running configuration on the switch.
Specifies the port speed.
errdisable detect
Use the errdisable detect global configuration command to enable error disable detection. Use the no form of this command to disable this feature.
errdisable detect cause {all | bpduguard | dtp-flap | link-flap | pagp-flap | rootguard | udld}
no errdisable detect cause {all | bpduguard | dtp-flap | link-flap | pagp-flap | rootguard | udld}
Syntax Description
Defaults
The default is all, enabled for all causes.
Command Modes
Global configuration
Command History
Usage Guidelines
A cause (bpduguard, dtp-flap, link-flap, pagp-flap, root-guard, udld) is 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 the error-disabled state until you enter the shutdown and no shutdown interface configuration commands. 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.
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 BPDU guard cause:
Switch(config)# errdisable detect cause bpduguardYou can verify your settings by entering the show errdisable detect user EXEC command.
Related Commands
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 | dtp-flap | link-flap | pagp-flap | rootguard | udld}} | {interval {interval}
no errdisable recovery {cause {all | bpduguard | dtp-flap | link-flap | pagp-flap | rootguard | udld}} | {interval}
Syntax Description
Defaults
Recovery is disabled for all causes.
Command Modes
Global configuration
Command History
Usage Guidelines
A cause (bpduguard, dtp-flap, link-flap, pagp-flap, root-guard, udld) is 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 the error-disabled state until you enter the shutdown and no shutdown interface configuration commands. 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.
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 the timer to recover from the BPDU-guard cause:
Switch(config)# errdisable recovery cause bpduguardThis example shows how to set the timer to 300 seconds:
Switch(config)# errdisable recovery interval 300You can verify your settings by entering the show errdisable recovery user EXEC command.
Related Commands
Enables the error disable detection feature.
Displays errdisable recovery timer information.
Displays interface status or a list of interfaces in error-disabled state.
exit
Use the exit VLAN configuration command to implement the proposed VLAN configuration, increment the database configuration number, propagate it throughout the administrative domain, and return to privileged EXEC mode.
exit
Syntax Description
This command has no arguments or keywords.
Defaults
No default is defined.
Command Modes
VLAN configuration
Command History
12.0(5.2)WC(1)
This command was first introduced.
12.1(6)EA2
The command mode was changed from VLAN database to VLAN configuration.
Usage Guidelines
The exit command implements all the configuration changes you made since you entered VLAN configuration mode and uses them for the running configuration. This command returns you to privileged EXEC mode.
Examples
This example shows how to implement the proposed VLAN configuration and return to privileged EXEC mode:
Switch(vlan)# exitSwitch#You can verify your settings changes by entering the show vlan brief privileged EXEC command.
Related Commands
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} {off | on | desired}
Note
Syntax Description
Defaults
The defaults for 10/100/1000 and GBIC-module ports are flowcontrol receive off and flowcontrol send desired.
Command Modes
Interface configuration
Command History
12.0(5.2)WC(1)
This command was first introduced.
12.1(6)EA2
The asymmetric and symmetric keywords were replaced with the receive, send, off, on, and desired keywords.
Usage Guidelines
Use the flowcontrol command only on 10/100/1000 and GBIC-module ports.
We strongly recommend that you do not configure IEEE 802.3X flowcontrol when quality of service (QoS) is configured on the switch. Before configuring flowcontrol on an interface, make sure to disable QoS on the switch.
Note that when used with receive, the on and desired keywords have the same result.
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:
•
•
•
•
•
•
Table 2-1 shows the flow control resolution achieved on local and remote ports by a combination of settings. The table assumes that for receive, using the desired keyword has the same results as using the on keyword.
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 offSwitch(config-if)# flowcontrol send offYou can verify your settings by entering the show interfaces counters privileged EXEC command.
Related Commands
Displays the interface settings on a switch, including input and output flow control.
interface
Use the interface global configuration command to configure an interface type, create a switch virtual interface to be used as the management VLAN interface, and to enter interface configuration mode.
interface {type port | vlan number}
no interface {type port | vlan number}
Syntax Description
type
Type of interface to be configured. Can be Fast Ethernet or Gigabit Ethernet.
port
Port ID.
vlan number
VLAN number from 1 to 1001 to be used as the management VLAN. Do not enter leading zeroes.
Defaults
The default management VLAN interface is VLAN 1.
Command Modes
Global configuration
Command History
12.0(5.2)WC(1)
This command was first introduced.
12.1(6)EA2
The usage guidelines were modified.
Usage Guidelines
When creating a management VLAN interface, a space between vlan and number is accepted.
Only one management VLAN interface can be active.
You cannot delete the management VLAN 1 interface.
You can use the no shutdown interface configuration command to shut down the active management VLAN interface and to enable a new one.
You can configure the management VLAN interface on static-access and trunk ports.
Examples
This example shows how to enable the switch to configure interface 2:
Switch(config)# interface fastethernet0/2Switch(config-if)#This example shows how to change the management VLAN from the default management VLAN to VLAN 3. This series of commands should only be entered from the console. If these commands are entered through a Telnet session, the shutdown command disconnects the session, and there is no way to use IP to access the system.
Switch# configure terminalSwitch(config)# interface vlan 3Switch(config-if)# ip address 172.20.128.176 255.255.255.0Switch(config-if)# no shutdownSwitch(config-if)# exitYou can verify your settings by entering the show interface and show interface vlan number privileged EXEC commands.
Related Commands
Displays the administrative and operational status of a switching (nonrouting) port.
Disables a port and shuts down the management VLAN.
interface port-channel
Use the interface port-channel global configuration command to access or create the port-channel logical interface for Layer 2 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
Defaults
No port-channel logical interfaces are defined.
Command Modes
Global configuration
Command History
Usage Guidelines
Only one port channel in a channel group is allowed.
Follow these guidelines when you use the interface port-channel command:
•
•
Examples
This example shows how to create a port-channel interface with a port-channel number of 5:
Switch(config)# interface port-channel 5You can verify your settings by entering the show running-config or show etherchannel channel-group-number detail privileged EXEC command.
Related Commands
Assigns an Ethernet interface to an EtherChannel group.
Displays EtherChannel information for a channel.
show running-config
Displays the running configuration on the switch.
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
no interface range port-range
Syntax Description
port-range
Port range. For a list of valid values for port-range, see the "Usage Guidelines" section.
Defaults
This command has no default setting.
Command Modes
Global configuration
Command History
Usage Guidelines
From the interface range configuration mode, all interface parameters that you enter are applied to all interfaces within the range.
For VLANs, you can use the interface range command only on existing VLAN interfaces. To display VLAN interfaces, enter the show running-config privileged EXEC command. VLANs not displayed cannot be used in the interface range command. The commands that you enter under the interface range command are applied to all existing VLAN interfaces 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 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.
These are the valid values for port-range type and interface:
•
•
•
•
For physical interfaces, the interface-id is defined as a slot/number (where slot is always 0 for the Catalyst 2950 switch), and the range can be entered as type 0/number - number (for example, gigabitethernet0/1 - 2).
When you define a range, you must enter a space before and after the hyphen (-):
interface range gigabitethernet0/1 - 2A single interface can also be specified in port-range (the command is then similar to the interface interface-id global configuration command).
Examples
This example shows how to use the interface range command to enter interface range configuration mode and to enter commands for two ports:
Switch(config)# interface range gigabitethernet0/1 - 2Switch(config-if-range)#Related Commands
ip access-group
Use the ip access-group interface configuration command to control access to an interface. Use the no form of this command to remove an access group from an interface.
ip access-group {access-list-number | name} in
no ip access-group {access-list-number | name} in
This command is available on physical interfaces only if your switch is running the enhanced software image.
Syntax Description
access-list-number
Number of the IP access control list (ACL), from 1 to 199 or from 1300 to 2699.
name
Name of an IP ACL, specified in the ip access-list command.
Defaults
No ACL is applied to the interface.
Command Modes
Interface configuration
Command History
12.1(6)EA2
This command was first introduced.
12.1(6)EA2b
This command is supported only by the enhanced software image.
Usage Guidelines
You can apply IP ACLs only to ingress interfaces. If a MAC access group is already defined for an interface, you cannot apply this command to the interface.
The ACLs can be standard or extended.
For standard ACLs, after receiving a packet, the switch checks the packet source address. If the source address matches a defined address in the ACL and the list permits the address, the switch forwards the packet.
For extended ACLs, after receiving the packet, the switch checks the match conditions in the ACL. If the conditions are matched, the switch forwards the packet.
If the specified ACL does not exist, the switch forwards all packets.
IP access groups can be separated on Layer 2 and Layer 3 interfaces.
Note
Examples
This example shows how to apply a numbered ACL to an interface:
Switch(config)# interface fastethernet0/1Switch(config-if)# ip access-group 101 inYou can verify your settings by entering the show access-lists or show ip access-lists privileged EXEC command.
Related Commands
ip access-list
Use the ip access-list global configuration command to create an IP access control list (ACL) to be used for matching packets to an ACL whose name or number you specify and to enter access-list configuration mode. Use the no form of this command to delete an existing IP ACL and return to global configuration mode.
ip access-list {standard | extended} {name | access-list-number}
no ip access-list {standard | extended} {name | access-list-number}
This command is available on physical interfaces only if your switch is running the enhanced software image.
Syntax Description
Defaults
No named or numbered IP ACLs are defined.
Command Modes
Global configuration
Command History
12.1(6)EA2
This command was first introduced.
12.1(6)EA2b
This command is supported only by the enhanced software image.
Usage Guidelines
Use this command to enter access-list configuration mode and to specify the name or number of the IP ACL for which you want to create or modify ACL match criteria. In this mode, you must enter the permit and deny commands to configure the permit and deny access conditions for this list.
Use the ip access-list command and its subcommands to define packet classification and marking as part of a globally-named service policy applied on a per-interface basis or as an IP access group applied on a per-interface basis.
Specifying standard or extended with the ip access-list command determines the prompt that you get when you enter access-list configuration mode.
Note
Examples
This example shows how to configure a standard ACL named Internetfilter1:
Switch(config)# ip access-list standard Internetfilter1Switch(config-std-nacl)# permit 192.5.34.0 0.0.0.255Switch(config-std-nacl)# permit 192.5.32.0 0.0.0.255Switch(config-std-nacl)# exitThis example shows how to configure an extended ACL named Internetfilter2:
Switch(config)# ip access-list extended Internetfilter2Switch(config-ext-nacl)# permit any 128.8.10.0 0.0.0.255 eq 80Switch(config-ext-nacl)# permit any 128.5.8.0 0.0.0.255 eq 80Switch(config-ext-nacl)# exit
Note
You can verify your settings by entering the show access-lists or show ip access-lists privileged EXEC command.
Related Commands
ip address
Use the ip address interface configuration command to set an IP address for a switch. Use the no form of this command to remove an IP address or to disable IP processing.
ip address ip-address subnet-mask
no ip address ip-address subnet-mask
Syntax Description
Defaults
No IP address is defined for the switch.
Command Modes
Interface configuration
Command History
Usage Guidelines
A switch can have one IP address.
The IP address of the switch can be accessed only by nodes connected to ports that belong to the management VLAN. By default, the management VLAN is VLAN 1, but you can configure a different VLAN as the management VLAN.
If you remove the IP address through a Telnet session, your connection to the switch is lost.
If your switch receives its IP address from a Bootstrap Protocol (BOOTP) or a Dynamic Host Configured 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.
Examples
This example shows how to configure the IP address for the switch on a subnetted network:
Switch(config)# interface vlan 1Switch(config-if)# ip address 172.20.128.2 255.255.255.0You can verify your settings by entering the show running-config privileged EXEC command.
Related Commands
ip igmp snooping
Use the ip igmp snooping global configuration command to globally enable Internet Group Management Protocol (IGMP) snooping. Use the no form of this command to disable IGMP snooping.
ip igmp snooping
no ip igmp snooping
Syntax Description
This command has no arguments or keywords.
Defaults
By default, IGMP snooping is globally enabled.
Command Modes
Global configuration
Command History
Usage Guidelines
When IGMP snooping is globally enabled, it enables IGMP snooping on all the existing VLAN interfaces. When IGMP snooping is globally disabled, it disables IGMP snooping on all the existing VLAN interfaces.
The configuration is saved in nonvolatile RAM (NVRAM).
Examples
This example shows how to globally enable IGMP snooping:
Switch(config)# ip igmp snoopingThis example shows how to globally disable IGMP snooping:
Switch(config)# no ip igmp snoopingYou can verify your settings commands by entering the show ip igmp snooping privileged EXEC command.
Related Commands
ip igmp snooping vlan
Use the ip igmp snooping vlan global configuration command to enable Internet Group Management Protocol (IGMP) snooping on a specific VLAN. Use the no form of this command to disable IGMP snooping on a VLAN interface.
ip igmp snooping vlan vlan-id
no ip igmp snooping vlan vlan-id
Syntax Description
Defaults
By default, IGMP snooping is enabled when each VLAN is created.
Command Modes
Global configuration
Command History
Usage Guidelines
This command automatically configures the VLAN if it is not already configured. The configuration is saved in nonvolatile RAM (NVRAM).
Examples
This example shows how to enable IGMP snooping on VLAN 2:
Switch(config)# ip igmp snooping vlan 2This example shows how to disable IGMP snooping on VLAN 2:
Switch(config)# no ip igmp snooping vlan 2You can verify your settings by entering the show ip igmp snooping vlan privileged EXEC command.
Related Commands
ip igmp snooping vlan immediate-leave
Use the ip igmp snooping immediate-leave global configuration command to enable Internet Group Management Protocol (IGMP) Immediate-Leave processing on a VLAN interface. Use the no form of this command to disable Immediate-Leave processing on the VLAN interface.
ip igmp snooping vlan vlan-id immediate-leave
no ip igmp snooping vlan vlan-id immediate-leave
Syntax Description
Defaults
By default, IGMP Immediate-Leave processing is disabled.
Command Modes
Global configuration
Command History
Usage Guidelines
Use the Immediate-Leave feature only when there is only one IP multicast receiver present on every port in the VLAN. The Immediate-Leave configuration is saved in nonvolatile RAM (NVRAM).
The Immediate-Leave feature is supported only with IGMP version 2 hosts.
Examples
This example shows how to enable IGMP Immediate-Leave processing on VLAN 1:
Switch(config)# ip igmp snooping vlan 1 immediate-leaveThis example shows how to disable IGMP Immediate-Leave processing on VLAN 1:
Switch(config)# no ip igmp snooping vlan 1 immediate-leaveYou can verify your settings by entering the show ip igmp snooping vlan privileged EXEC command.
Related Commands
ip igmp snooping vlan mrouter
Use the ip igmp snooping vlan mrouter global configuration command to add a multicast router port and to configure the multicast router learning method. Use the no form of this command to remove the configuration.
ip igmp snooping vlan vlan-id mrouter {interface interface-id | learn {cgmp | pim-dvmrp}}
no ip igmp snooping vlan vlan-id mrouter {interface interface-id | learn {cgmp | pim-dvmrp}}
Syntax Description
Defaults
The default learning method is pim-dvmrp.
Command Modes
Global configuration
Command History
Usage Guidelines
The CGMP learning method is useful for controlling traffic in Cisco router environments.
The configured learning method is saved in nonvolatile RAM (NVRAM).
Static connections to multicast routers are supported only on switch ports.
Examples
This example shows how to configure Fast Ethernet interface 0/6 as a multicast router port:
Switch(config)# ip igmp snooping vlan 1 mrouter interface fastethernet0/6This example shows how to specify the multicast router learning method as CGMP:
Switch(config)# no ip igmp snooping vlan 1 mrouter learn cgmpYou can verify your settings by entering the show ip igmp snooping mrouter privileged EXEC command.
Related Commands
ip igmp snooping vlan static
Use the ip igmp snooping vlan vlan-id static global configuration command to add a Layer 2 port as a member of a multicast group. Use the no form of this command to remove the configuration.
ip igmp snooping vlan vlan-id static mac-address interface interface-id
no ip igmp snooping vlan vlan-id static mac-address interface interface-id
Syntax Description
Defaults
None configured.
Command Modes
Global configuration
Command History
Usage Guidelines
The command is used to statically configure the IP multicast group member ports.
The static ports and groups are saved in nonvolatile RAM (NVRAM).
Static connections to multicast routers are supported only on switch ports.
Examples
This example shows how to statically configure a host on an interface:
Switch(config)# ip igmp snooping vlan 1 static 0100.5e02.0203 interface fastethernet0/6Configuring port FastEthernet 0/6 on group 0100.5e02.0203You can verify your settings by entering the show mac-address-table multicast privileged EXEC command.
Related Commands
mac access-group
Use the mac access-group interface configuration command to apply a named extended MAC access control list (ACL) to an interface. Use the no form of this command to remove a MAC ACL from an interface.
mac access-group name in
no mac access-group name in
This command is available only if your switch is running the enhanced software image.
Syntax Description
Defaults
No MAC ACL is applied to the interface.
Command Modes
Interface configuration
Command History
12.1(6)EA2
This command was first introduced.
12.1(6)EA2b
This command is supported only by the enhanced software image.
Usage Guidelines
You can apply MAC ACLs only to ingress interfaces. If an IP access group is already defined for an interface, you cannot apply this command to the interface.
After receiving the packet, the switch checks the match conditions in the ACL. If the conditions are matched, the switch forwards the packet.
If the specified ACL does not exist, the switch forwards all packets.
Note
Examples
This example shows how to apply a MAC extended ACL named macacl2 to an interface:
Switch(config)# interface fastethernet0/1Switch(config-if)# mac access-group macacl2 inYou can verify your settings by entering the show mac access-group privileged EXEC command.
Related Commands
{deny (MAC access-list configuration) | permit (MAC access-list configuration)}
Configures a MAC ACL.
Displays the MAC ACLs configured on the switch.
Displays the ACLs configured on the switch.
mac access-list extended
Use the mac access-list extended global configuration command to create an access control list (ACL) based on MAC addresses. Using this command changes the mode to 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
This command is available only if your switch is running the enhanced software image.
Syntax Description
Defaults
No MAC ACLs are created.
Command Modes
Global configuration
Command History
12.1(6)EA2
This command was first introduced.
12.1(6)EA2b
This command is supported only by the enhanced software image.
Usage Guidelines
MAC-named extended ACLs are used with the mac access-group interface configuration command and class maps.
Note
Examples
This example shows how to enter extended MAC access-list configuration mode and to create a MAC extended ACL named mac1:
Switch(config)# mac access-list extended mac1Switch(config-ext-macl)#This example shows how to delete the MAC extended ACL named mac1:
Switch(config)# no mac access-list extended mac1You can verify your settings by entering the show access-lists privileged EXEC command.
Related Commands
{deny (MAC access-list configuration) | permit (MAC access-list configuration)}
Configures a MAC ACL.
Applies a MAC ACL to an interface.
Creates a class map to be used for matching packets to the class whose name you specify and to enter class-map configuration mode.
Displays the ACLs configured on the switch.
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.
mac-address-table aging-time [0 | 10-1000000]
no mac-address-table aging-time [0 | 10-1000000]
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.
Defaults
The default is 300 seconds.
Command Modes
Global configuration
Command History
12.0(5.2)WC(1)
This command was first introduced.
12.1(6)EA2
The aging-time values were modified.
Usage Guidelines
If hosts do not send continuously, increase the aging time to record the dynamic entries for a longer time. This reduces the possibility of flooding when the hosts send again.
Examples
This example shows how to set the aging time to 200 seconds:
Switch(config)# mac-address-table aging-time 200This exampleshows how to disable aging in VLAN 1.
Switch(config)# mac-address-table aging-time 0This example shows how to set aging time to 450 seconds for all VLANs for which the user did not specify aging time.
Switch(config)# mac-address-table aging-time 450You can verify your settings by entering the show mac-address-table privileged EXEC command.
Related Commands
Deletes dynamic entries from the MAC address table.
Displays the MAC address table.
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 notification feature and configure the notification-trap interval or history table. Use the no form of this command to disable this feature.
mac-address-table notification [interval interval | history-size size]
no mac-address-table notification [interval interval | history-size size]
Syntax Description
Defaults
The MAC notification feature is disabled.
The default trap-interval value is 1 second.
The default number of entries in the history table is one.
Command Modes
Global configuration
Command History
Usage Guidelines
The MAC address notification feature sends Simple Network Management Protocol (SNMP) traps to the network management system (NMS) whenever a MAC address is added or 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 notification feature:
Switch(config)# mac-address-table notificationThis example shows how to set the notification-trap interval to 60 seconds:
Switch(config)# mac-address-table notification interval 60This example shows how to set the number of entries in the history table to 32:
Switch(config)# mac-address-table notification history-size 32You can verify your settings by entering the show mac-address-table notification privileged EXEC command.
Related Commands
Enables the MAC-notification traps on a port.
Enables SNMP notification for the MAC notification feature.
Displays MAC-notification parameters.
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 MAC address table.
mac-address-table static mac-addr vlan vlan-id interface interface-id interface-id...
no mac-address-table static mac-addr vlan vlan-id interface interface-id interface-id...
Syntax Description
Defaults
None configured.
Command Modes
Global configuration
Command History
12.0(5.2)WC(1)
This command was first introduced.
12.1(6)EA2
The interface keyword and parameters were changed.
Examples
This example shows how to add the static address 0004.5600.67ab to the MAC address table:
Switch(config)# mac-address-table static 0004.5600.67ab vlan 1 interface fastethernet0/2This 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 interfaces:
Switch(config)# mac-address-table static c2f3.220a.12f4 vlan 4 interface gigabitethernet0/1 gigabitethernet0/2You can verify your settings by entering the show mac-address-table privileged EXEC command.
Related Commands
Deletes entries from the MAC address table.
Sets the length of time that a dynamic entry remains in the MAC address table after the entry is used or updated.
Displays the MAC address table.
show mac-address-table static
Displays static MAC address table entries only.
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 | name acl-name}
no match access-group {acl-index | name acl-name}
This command is available only if your switch is running the enhanced software image.
Syntax Description
Defaults
No match criteria are defined.
Command Modes
Class-map configuration
Command History
12.1(6)EA2
This command was first introduced.
12.1(6)EA2b
This command is supported only by the enhanced software image.
Usage Guidelines
Use the match command to specify which fields in the incoming packets are examined to classify the packets. Only IP access groups and MAC access groups are supported.
Only one match command per class map is supported.
Note
Examples
This example shows how to classify traffic on an interface by using the access group named acl2:
Switch(config)# class-map class2Switch(config-cmap)# match access-group name acl2Switch(config-cmap)# exitYou can verify your settings by entering the show class-map privileged EXEC command.
Related Commands
mls qos cos
Use the mls qos cos interface configuration command to define the default class of service (CoS) value of a port or to 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
Defaults
The default CoS value for a port is 0.
CoS override is disabled.
Command Modes
Interface configuration
Command History
12.1(6)EA2
This command was first introduced. It replaced the switchport priority command.
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 by using 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 was previously set to trust DSCP or CoS, this command overrides that 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 gigabitethernet0/1Switch(config-if)# mls qos trust cosSwitch(config-if)# mls qos cos 4This example shows how to assign all the packets entering a port to the default port CoS value of 4:
Switch(config)# interface gigabitethernet0/1Switch(config-if)# mls qos cos 4Switch(config-if)# mls qos cos overrideYou can verify your settings by entering the show mls qos interface privileged EXEC command.
Related Commands
Defines the CoS-to-DSCP map or the DSCP-to-CoS map.
Configures the port trust state.
Displays quality of service (QoS) 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 or DSCP-to-CoS 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}
no mls qos map {cos-dscp | dscp-cos}
This command is available only if your switch is running the enhanced software image.
Syntax Description
Defaults
Table 2-2 shows the default CoS-to-DSCP map:
Table 2-3 shows the default DSCP-to-CoS map:
Table 2-3 Default DSCP-to-CoS Map
DSCP Values
0
8, 10
16, 18
24, 26
32, 34
40, 46
48
56
CoS Value
0
1
2
3
4
5
6
7
Command Modes
Global configuration
Command History
12.1(6)EA2
This command was first introduced.
12.1(6)EA2b
This command is supported only by the enhanced software image.
Usage Guidelines
All the maps are globally defined. You apply all maps to all ports.
If you enter the mls qos trust cos command, the default CoS-to-DSCP map is applied.
If you enter the mls qos trust dscp command, the default DSCP-to-CoS map is applied.
After a default map is applied, you can define the CoS-to-DSCP or DSCP-to-CoS map by entering consecutive mls qos map commands.
The supported DSCP values are 0, 8, 10, 16, 18, 24, 26, 32, 34, 40, 46, 48, and 56. If the mls qos trust dscp command is entered and a packet with a untrusted DSCP value is at an ingress port, the packet CoS value is set to 0.
Note
Examples
This example shows how to define the DSCP-to-CoS map. DSCP values 16, 18, 24, and 26 are mapped to CoS 1. DSCP values 0, 8, and 10 are mapped to CoS 0.
Switch# configure terminalSwitch(config)# mls qos map dscp-cos 16 18 24 26 to 1Switch(config)# mls qos map dscp-cos 0 8 10 to 0This example shows how to define the CoS-to-DSCP map. CoS values 0 to 7 are mapped to DSCP values 8, 8, 8, 8, 24, 32, 56, and 56.
Switch# configure terminalSwitch(config)# mls qos map cos-dscp 8 8 8 8 24 32 56 56You can verify your settings by entering the show mls qos maps privileged EXEC command.
Related Commands
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 class of service (CoS) or Differentiated Services Code Point (DSCP) value. Use the no form of this command to return a port to its untrusted state.
mls qos trust [cos | dscp]
no mls qos trust [cos | dscp]
This command is available only if your switch is running the enhanced software image.
Syntax Description
Defaults
The port is not trusted. If no keyword is specified, the default is dscp.
Command Modes
Interface configuration
Command History
12.1(6)EA2
This command was first introduced.
12.1(6)EA2b
This command is supported only by the enhanced software image.
Usage Guidelines
Packets entering a quality of service (QoS) domain are classified at the edge of the QoS domain. Because the packets are classified at the edge, the switch port within the QoS domain can be configured to one of the trusted states; 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 and the incoming packet is a non-IP packet, the CoS value for the packet is set to 0, and the DSCP-to-CoS map is not applied.
If 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 DSCP-to-CoS map).
If CoS is trusted, CoS of the packet is not modified, but DSCP can be modified (according to the CoS-to-DSCP map) if it is an IP packet.
Examples
This example shows how to configure a port to be a DSCP-trusted port:
Switch(config)# interface gigabitethernet0/1Switch(config-if)# mls qos trust dscpYou can verify your settings by entering the show mls qos interface privileged EXEC command.
Related Commands
monitor session
Use the monitor session global configuration command to enable Switch Port Analyzer (SPAN) monitoring on a port or multiple ports and to configure a port as a source port or a destination port. Use the no form of this command to return the port to its default value.
monitor session {session} {source {interface interface-id} [, | - | rx | tx | both]}
no monitor session {session} {source {interface interface-id} [, | - | rx | tx | both]}
monitor session {session} {destination {interface interface-id}}
no monitor session {session} {destination {interface interface-id}}
Syntax Description
Defaults
SPAN monitoring is disabled.
Command Modes
Global configuration
Command History
12.1(6)EA2
This command was first introduced. It replaced the port monitor command.
Usage Guidelines
The switch supports only one SPAN session. For this session, there is no limit on the number of SPAN source ports.
You can configure a port or multiple ports as SPAN source ports. You can configure a SPAN source port to monitor received traffic, sent traffic, or received and sent traffic.
You can configure only one port as a SPAN destination port for a SPAN session. If you attempt to add another destination interface to a session that already has a destination interface configured, an error message appears. You must first remove a SPAN destination interface before changing the SPAN destination to a different interface.
All traffic to the SPAN destination port is seen with the 802.1Q tag, but packets from the switch CPU to the destination port are without the 802.1Q tag.
Examples
This example shows how to configure a port as a SPAN source port that monitors only received traffic:
Switch(config)# monitor session 1 source fastethernet0/1 rxThis example shows how to configure a port as a SPAN destination port:
Switch(config)# monitor session 1 destination fastethernet0/2This example shows how to return to the default SPAN settings:
Switch(config)# no monitor session 1 source fastethernet0/4You can verify your settings by entering the show monitor privileged EXEC command.
Related Commands
mvr
Use the mvr global configuration command without keywords to enable the multicast VLAN registration (MVR) feature on the switch. Use the no form of this command to disable MVR and its options. Use the command with keywords to set the MVR mode for a switch, to configure the MVR IP multicast address, to 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 the command to return the switch to the default settings.
mvr [mode {dynamic | compatible} | group ip-address [count] | querytime value | vlan vlan-id]
no mvr [mode {dynamic | compatible} | group ip-address | querytime value | vlan vlan-id]
Syntax Description
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
Usage Guidelines
A maximum of 256 MVR multicast groups can be configured on a switch.
Use the mvr group command to statically configure 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 registered to receive data on that IP multicast address.
Note
The mvr querytime parameter applies only to receiver ports.
The mvr group and mvr vlan commands only apply to ports configured as receiver ports.
If the switch MVR is interoperating with Catalyst 2900 XL or Catalyst 3500 XL switches, set the multicast mode to compatible.
When in compatible mode, MVR does not support IGMP dynamic joins on MVR source ports.
Examples
This example shows how to enable MVR:
Switch(config)# mvrThis example shows how to disable MVR:
Switch(config)# no mvrThis example shows how to configure 228.1.23.4 as an IP multicast address:
Switch(config)# mvr group 228.1.23.4This command fails because of address aliasing:
Switch(config)# mvr group 230.1.23.4Cannot 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 10This example shows how to delete the previously configured ten IP multicast addresses:
Switch(config)# no mvr group 228.1.23.1 10This example shows how to delete all previously configured IP multicast addresses:
Switch(config)# no mvr groupThis example shows how to set the maximum query response time as 1 second (10 tenths):
Switch(config)# mvr querytime 10This example shows how to return the maximum query response time to the default setting of one-half second:
Switch(config)# no mvr querytimeThis example shows how to set VLAN 2 as the multicast VLAN:
Switch(config)# mvr vlan 2Use the show mvr members privileged EXEC command to display the IP multicast group addresses configured on the switch.
You can verify your settings by entering the show mvr privileged EXEC command.
Related Commands
Enables the Immediate-Leave feature on an interface.
Configures a port as a receiver or source port.
Configures a receiver port as a member of an MVR group.
Displays MVR global parameters or port parameters.
Displays all ports that are members of an MVR multicast group; if the group has no members, its status is shown as Inactive.
Displays the configured MVR interfaces with their type, status, and Immediate-Leave configuration.
show mvr interface interface-id member
Displays all MVR groups of which the interface is a member.
mvr immediate
Use the mvr immediate interface configuration command to enable the Immediate-Leave feature on an interface. Use the no form of this command to disable the feature on the interface.
mvr immediate
no mvr immediate
Syntax Description
This command has no keywords or arguments.
Defaults
The Immediate-Leave feature is disabled.
Command Modes
Interface configuration
Command History
Usage Guidelines
The Immediate-Leave feature applies only to receiver ports. When the Immediate-Leave feature is enabled, a receiver port leaves a multicast group more quickly. When the switch receives an Internet Group Management Protocol (IGMP) leave message from a group on a receiver port, it sends an IGMP 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 the Immediate-Leave feature, an IGMP 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, thus speeding up leave latency.
The Immediate-Leave feature should only be enabled on receiver ports to which a single receiver device is connected.
Examples
This example shows how to enable the Immediate-Leave feature on a port:
Switch(config-if)# mvr immediateThis example shows how to disable the Immediate-Leave feature on a port:
Switch(config-if)# no mvr immediateYou can verify your settings by entering the show mvr privileged EXEC command.
Related Commands
mvr type
Use the mvr type interface configuration command to configure a port as a multicast VLAN registration (MVR) receiver or source port. Use the no form of the command to return the port to the default settings.
mvr type {receiver | source}
no mvr type {receiver | source}
Syntax Description
receiver
Port that receives multicast data and cannot send multicast data to multicast groups.
source
Port that can send and receive multicast data to multicast groups.
Defaults
By default, a port is configured as neither receiver nor source.
Command Modes
Interface configuration
Command History
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.
Configure a port as a receiver port if that port should only be able to receive multicast data and should not be able to send multicast data to the configured multicast groups. None of the receiver ports receives multicast data unless it sends an Internet Group Management Protocol (IGMP) group join message for a multicast group.
A receiver port configured as a static member of a multicast group remains a member until statically removed from membership.
Note
A port that is not taking part in MVR should not be configured as an MVR receiver port or source port. This port is a normal switch port and is able to send and receive multicast data with normal switch behavior.
Examples
This example shows how to configure a port as an MVR receiver port:
Switch(config)# interface fastethernet0/1Switch(config-if)# mvr type receiverThis example shows how to configure a port as an MVR source port:
Switch(config)# interface fastethernet0/3Switch(config-if)# mvr type sourceThis example shows how to return a port to the default setting:
Switch(config)# interface fastethernet0/5Switch(config-if)# no mvr type receiverYou can verify your settings by entering the show mvr privileged EXEC command.
Related Commands
Enables MVR.
Enables the Immediate-Leave feature on an interface.
Configures a receiver port as a member of an MVR group.
Displays MVR global parameters or port parameters.
mvr vlan group
Use the mvr vlan group interface configuration command to statically configure a receiver port as a member of a multicast VLAN registration (MVR) group in a particular VLAN. Use the no form of the command to remove the port from the MVR group.
mvr vlan vlan-id group ip-address
no mvr vlan vlan-id group ip-address
Syntax Description
Defaults
By default, a port is configured as neither receiver nor source.
Command Modes
Interface configuration
Command History
Usage Guidelines
The receiver port belongs to a multicast VLAN.
The group address is configured as a MVR group address.
Examples
This example shows how to configure a static MVR group entry on port 0/1 in VLAN 10:
Switch(config)# interface fastethernet0/1Switch(config-if)# mvr vlan 10 group 225.1.1.1This example shows how to remove an entry on port 0/3 in VLAN 10:
Switch(config)# interface fastethernet0/3Switch(config-if)# no mvr 10 group 255.1.1.2You can verify your settings by entering the show mvr privileged EXEC command.
Related Commands
Enables MVR.
Enables the Immediate-Leave feature on an interface.
Configures a port as a receiver or source port.
Displays MVR global parameters or port parameters.
pagp learn-method
Use the pagp learn-method interface configuration command to set the source-address learning method 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
no pagp learn-method
Syntax Description
Note
Defaults
The default is aggregation-port (logical port channel).
Command Modes
Interface configuration
Command History
Usage Guidelines
The switch supports address learning only on aggregate ports even though the physical-port keyword is provided in the command-line interface (CLI). The pagp learn-method and the pagp port-priority interface configuration commands have no affect on the switch hardware.
Note
If the link partner to the switch is a physical learner that has the channel-group interface configuration command set to auto or desirable, the switch automatically uses the load-distribution method based on the source MAC address, regardless of the configured load-distribution method.
If the link partner to the switch is a physical learner that has the channel-group interface configuration command set to on, set the load-distribution method based on the source MAC address by using the port-channel load-balance src-mac global configuration command.
Examples
This example shows how to set the learning method to aggregation-port (the default):
Switch(config-if)# pagp learn-method aggregation-portYou can verify your settings by entering the show running-config or show pagp channel-group-number internal privileged EXEC command.
Related Commands
pagp port-priority
You do not need to enter this command. It is documented for informational purposes only. Though visible in the command-line help strings, the switch does not support the pagp port-priority command.
Use the pagp port-priority interface configuration command to select an interface through which all Port Aggregation Protocol (PAgP) traffic through the EtherChannel is sent. Use the no form of this command to return to the default value.
pagp port-priority priority
no pagp port-priority
Syntax Description
Defaults
The default value is 128.
Command Modes
Interface configuration
Command History
Usage Guidelines
The pagp learn-method and the pagp port-priority interface configuration commands have no affect on the switch hardware.
Note
Related Commands
permit (access-list configuration)
Use the permit access-list configuration command to configure conditions for a named or numbered IP access control list (ACL). Use the no form of the command to remove a permit condition from the IP ACL.
Use these commands with standard IP ACLs:
permit {source source-wildcard | host source | any}
no permit {source source-wildcard | host source | any}
Use these commands with extended IP ACLs:
permit protocol {source source-wildcard | host source | any} [operator port] {destination destination-wildcard | host source | any} [operator port]
no permit protocol {source source-wildcard | host source | any} [operator port] {destination destination-wildcard | host source | any} [operator port]
This command is available on physical interfaces only if your switch is running the enhanced software image.
Syntax Description
Defaults
There are no specific conditions that permit packets in a named or numbered IP ACL.
The default ACL is always terminated by an implicit deny statement for all packets.
Command Modes
Access-list configuration
Command History
12.1(6)EA2
This command was first introduced.
12.1(6)EA2b
This command is supported only by the enhanced software image.
Usage Guidelines
Use this command after the ip access-list global configuration command to specify permit conditions for a named or numbered IP ACL. You can specify a source IP address, destination IP address, IP protocol, TCP port, or UDP port. Specify the TCP and UDP port numbers only if protocol is tcp or udp and operator is eq.
Note
Examples
This example shows how to create an extended IP ACL and configure permit conditions for it:
Switch(config)# ip access-list extended Internetfilter2Switch(config-ext-nacl)# permit host 36.10.10.5 anySwitch(config-ext-nacl)# permit host 192.1.10.8 anyThis is an example of a standard ACL that sets permit conditions:
ip access-list standard Acclist1permit 192.5.34.0 0.0.0.255permit 128.88.10.0 0.0.0.255permit 36.1.1.0 0.0.0.255
Note
You can verify your settings by entering the show ip access-lists or show access-lists privileged EXEC command.
Related Commands
Sets deny conditions for an IP ACL.
Defines an IP ACL.
Controls access to an interface.
Displays IP ACLs configured on the switch.
Displays ACLs configured on a switch.
permit (MAC access-list configuration)
Use the permit MAC access-list configuration command to allow Layer 2 traffic to be forwarded if the conditions are matched. Use the no form of the command to remove a permit condition from the named MAC access control list (ACL).
{permit | deny} {any | host src-MAC-addr} {any | host dst-MAC-addr} [aarp | amber | dec-spanning | decnet-iv | diagnostic | dsm | etype-6000 | etype-8042 | lat | lavc-sca | mop-console | mop-dump | msdos | mumps | netbios | vines-echo |vines-ip | xns-idp]
no {permit | deny} {any | host src-MAC-addr} {any | host dst-MAC-addr} [aarp | amber | dec-spanning | decnet-iv | diagnostic | dsm | etype-6000 | etype-8042 | lat | lavc-sca | mop-console | mop-dump | msdos | mumps | netbios | vines-echo |vines-ip | xns-idp]
This command is available only if your switch is running the enhanced software image.
Syntax Description
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
12.1(6)EA2
This command was first introduced.
12.1(6)EA2b
This command is supported only by the enhanced software image.
Usage Guidelines
When an access control entry (ACE) is added to an ACL, 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.
These options are not allowed:
•
•
•
Note
Examples
This example shows how to define the named MAC extended ACL to deny 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 netbiosThis example shows how to remove the permit condition from the named MAC extended ACL:
Switch(config-ext-macl)# no permit any host 00c0.00a0.03fa netbiosYou can verify your settings by entering the show access-lists privileged EXEC command.
Related Commands
Creates an ACL based on MAC addresses.
Prevents Layer 2 traffic from being forwarded if conditions are matched.
Displays ACLs 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 | dscp dscp-value}]
no police rate-bps burst-byte [exceed-action {drop | dscp dscp-value}]
This command is available only if your switch is running the enhanced software image.
Syntax Description
Defaults
No policers are defined.
Command Modes
Policy-map class configuration
Command History
12.1(6)EA2
This command was first introduced.
12.1(6)EA2b
This command is supported only by the enhanced software image.
Usage Guidelines
You can configure up to six policers on ingress Fast Ethernet ports.
You can configure up to 60 policers on ingress Gigabit-capable Ethernet ports.
Policers cannot be configured on egress Fast Ethernet and Gigabit-capable Ethernet ports.
To return to policy-map configuration mode, use the exit command. To return to privileged EXEC mode, use the end command.
Note
Examples
This example shows how to configure a policer that sets the DSCP value to 46 if traffic does not exceed a 1-Mbps average rate with a burst size of 65536 bytes and drops packets if traffic exceeds these conditions:
Switch(config)# policy-map policy1Switch(config-pmap)# class class1Switch(config-pmap-c)# set ip dscp 46Switch(config-pmap-c)# police 1000000 65536 exceed-action dropSwitch(config-pmap-c)# exitYou can verify your settings by entering the show policy-map privileged EXEC command.
Related Commands
Creates or modifies a policy map that can be attached to multiple interfaces, and enters policy-map configuration mode.
Displays quality of service (QoS) policy maps.
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
This command is available only if your switch is running the enhanced software image.
Syntax Description
Defaults
No policy maps are defined.
Command Modes
Global configuration
Command History
12.1(6)EA2
This command was first introduced.
12.1(6)EA2b
This command is supported only by the enhanced software image.
Usage Guidelines
Entering the policy-map command enables the policy-map configuration mode. These configuration commands are available:
•
•
•
•
•
Note
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 or modified. Entering this 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. Use the class-map and match commands to configure the match criteria for a class. Only one match command per class map is supported.
Only one policy map per interface per direction is supported. You can apply the same policy map to multiple interfaces but only in the ingress direction.
Note
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 and polices the traffic at an average rate of 1 Mbps and bursts at 65536 bytes. Traffic exceeding the profile is dropped.
Switch(config)# policy-map policy1Switch(config-pmap)# class class1Switch(config-pmap-c)# police 1000000 65536 exceed-action dropSwitch(config-pmap-c)# exitSwitch(config-pmap)#This example shows how to delete policymap2:
Switch(config)# no policy-map policymap2You can verify your settings by entering the show policy-map privileged EXEC command.
Related Commands
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 reset the load distribution to the default.
port-channel load-balance method
no port-channel load-balance
Syntax Description
method
Load distribution method.
These are the method values:
•
•
Defaults
The default method is src-mac.
Command Modes
Global configuration
Command History
Usage Guidelines
If the link partner to the Catalyst 2950 switch is a physical learner that has the channel-group interface configuration command set to auto or desirable, the switch automatically uses the load-distribution method based on the source MAC address regardless of the configured load-distribution method.
If the link partner to the switch is a physical learner that has the channel-group interface configuration command set to on, set the load-distribution method based on the source MAC address by using the port-channel load-balance src-mac global configuration command.
Examples
This example shows how to set the load-distribution method to dst-mac:
Switch(config)# port-channel load-balance dst-macYou can verify your settings by entering the show etherchannel privileged EXEC command.
Related Commands
Assigns an Ethernet interface to an EtherChannel group.
Displays EtherChannel information for a channel.
show running-config
Displays the running configuration on the switch.
rcommand
Use the rcommand user EXEC command to start a Telnet session and to enter commands from the command switch for a member switch. To end the session, enter the exit command.
rcommand {n | commander | mac-address hw-addr}
Syntax Description
Command Modes
User EXEC
Command History
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 enter 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:
•
•
The Catalyst 1900 and 2820 CLI is available only on switches running Enterprise Edition Software.
This command does 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 3Switch-3# show versionCisco Internet Operating System Software ......Switch-3# exitSwitch#Related Commands
reset
Use the reset VLAN configuration command to abandon the proposed VLAN configuration and to remain in VLAN configuration mode. This command resets the proposed configuration to the current VLAN configuration on the switch.
reset
Syntax Description
This command has no arguments or keywords.
Defaults
No default is defined.
Command Modes
VLAN configuration
Command History
12.0(5.2)WC(1)
This command was first introduced.
12.1(6)EA2
The command mode was changed from VLAN database to VLAN configuration.
Examples
This example shows how to abandon the proposed VLAN configuration and to reset the current VLAN configuration:
Switch(vlan)# resetSwitch(vlan)#You can verify that no VLAN configuration changes occurred by entering the show changes and show proposed VLAN configuration commands.
Related Commands
rmon collection stats
Use the rmon collection stats interface configuration command to collect Ethernet group statistics. The Ethernet group statistics 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
Remote Network Monitoring (RMON) collection control index. The range is 1 to 65535.
owner name
(Optional) Owner of the RMON collection.
Defaults
The RMON statistics collection is disabled.
Command Modes
Interface configuration
Command History
Usage Guidelines
The RMON statistics collection command is based on hardware counters.
Examples
This example shows how to collect RMON statistics for the owner root on an interface:
Switch(config)# interface fastethernet0/1Switch(config-if)# rmon collection stats 2 owner rootYou can verify your settings by entering the show rmon statistics user EXEC command.
Related Commands
service-policy
Use the service-policy interface configuration command to apply a policy map defined by the policy-map command to the input of a particular interface. Use the no form of this command to remove the policy map and interface association.
service-policy input policy-map-name
no service-policy input policy-map-name
This command is available only if your switch is running the enhanced software image.
Syntax Description
Defaults
No policy maps are attached to the interface.
Command Modes
Interface configuration
Command History
12.1(6)EA2
This command was first introduced.
12.1(6)EA2b
This command is supported only by the enhanced software image.
Usage Guidelines
Only one policy map per ingress interface is supported.
Service policy maps cannot be defined on egress interfaces.
Note
Examples
This example shows how to apply plcmap1 to an ingress interface:
Switch(config)# interface gigabitethernet0/1Switch(config-if)# service-policy input plcmap1You can verify your settings by entering the show policy-map privileged EXEC command.
Related Commands
Creates or modifies a policy map that can be attached to multiple interfaces to specify a service policy.
Displays quality of service (QoS) policy maps.
set
Use the set policy-map class configuration command to classify IP traffic by setting a Differentiated Services Code Point (DSCP) value. Use the no form of this command to remove traffic classification.
set ip dscp new-dscp
no set ip dscp new-dscp
This command is available only if your switch is running the enhanced software image.
Syntax Description
new-dscp
New DSCP value assigned to the classified traffic.
The supported DSCP values are 0, 8, 10, 16, 18, 24, 26, 32, 34, 40, 46, 48, and 56.
Defaults
No traffic classification is defined.
Command Modes
Policy-map class configuration
Command History
12.1(6)EA2
This command was first introduced.
12.1(6)EA2b
This command is supported only by the enhanced software image.
Usage Guidelines
The set command can be used in a policy with a match command.
The set command sets the DSCP value for in-profile packets.
Note
To return to policy-map configuration mode, use the exit command. To return to privileged EXEC mode, use the end command.
Note
Examples
This example shows how to assign a DSCP value of 10 to all FTP traffic without any policers:
Switch(config)# policy-map policy_ftpSwitch(config-pmap)# class ftp_classSwitch(config-pmap-c)# set ip dscp 10Switch(config-pmap)# exitYou can verify your settings by entering the show policy-map privileged EXEC command.
Related Commands
show access-lists
Use the show access-lists privileged EXEC command to display access control lists (ACLs) configured on the switch.
show access-lists [name | number] [ | {begin | exclude | include} expression]
Syntax Description
Command Modes
Privileged EXEC
Command History
Usage Guidelines
Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output do not appear, but the lines that contain Output appear.
Examples
This is an example of output from the show access-lists command:
Switch# show access-listsStandard IP access list testingaclpermit 10.10.10.2Standard IP access list wizard_1-1-1-2permit 1.1.1.2Extended IP access list 103permit tcp any any eq wwwExtended IP access list CMP-NAT-ACLDynamic Cluster-HSRP deny ip any anyDynamic Cluster-NAT permit ip any anypermit ip host 10.123.222.192 anypermit ip host 10.228.215.0 anypermit ip host 10.245.137.0 anypermit ip host 10.245.155.128 anypermit ip host 10.221.111.64 anypermit ip host 10.216.25.128 anypermit ip host 10.186.122.64 anypermit ip host 10.169.110.128 anypermit ip host 10.146.106.192 anyRelated Commands
show changes
Use the show changes VLAN configuration command to display the differences between the current VLAN configuration and the proposed VLAN configuration. You can also display the differences between the two for a selected VLAN.
show changes [vlan-id]
Syntax Description
Command Modes
VLAN configuration
Command History
12.0(5.2)WC(1)
This command was first introduced.
12.1(6)EA2
The command mode was changed from VLAN database to VLAN configuration.
Examples
This is an example of output from the show changes command:
Switch(vlan)# show changesADDED:Name:VLAN0003Media Type:EthernetVLAN 802.10 Id:100003State:OperationalMTU:1500ADDED:Name:VLAN0004Media Type:EthernetVLAN 802.10 Id:100004State:OperationalMTU:1500This is an example of output from the show changes 4 command for VLAN 4:
Switch(vlan)# show changes 4ADDED:Name:VLAN0004Media Type:EthernetVLAN 802.10 Id:100004State:OperationalMTU:1500Related Commands
Displays the VLAN configuration on the switch or a selected VLAN.
Displays the proposed VLAN configuration for a selected VLAN.
show class-map
Use the show class-map privileged EXEC command to display quality of service (QoS) class maps, which define the match criteria to classify traffic.
show class-map [class-map-name] [ | {begin | exclude | include} expression]
This command is available only if your switch is running the enhanced software image.
Syntax Description
Command Modes
Privileged EXEC
Command History
12.1(6)EA2
This command was first introduced.
12.1(6)EA2b
This command is supported only by the enhanced software image.
Usage Guidelines
If you do not specify a class-map-name, all class maps appear.
Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output do not appear, but the lines that contain Output appear.
Examples
This is an example of output from the show class-map test command:
Switch# show class-map testClass Map match-all test (id 2)Match access-group name testingaclThis is an example of output from the show class-map command:
Switch# show class-mapClass Map match-all wizard_1-1-1-2 (id 3)Match access-group name videowizard_1-1-1-2Class Map match-all test (id 2)Match access-group name testingaclClass Map match-any class-default (id 0)Match anyClass Map match-all class1 (id 5)Match access-group 103Class Map match-all classtest (id 4)Description: This is a test.Match access-group name testingaclRelated Commands
Creates a class map to be used for matching packets to the class whose name you specify.
Defines the match criteria to classify traffic.
show cluster
Use the show cluster user EXEC command to display the cluster status and a summary of the cluster to which the switch belongs. This command can be entered on command and member switches.
show cluster [ | {begin | exclude | include} expression]
Syntax Descriptionshow cluster
Command Modes
User EXEC
Command History
Usage Guidelines
On a member switch, this command displays the identity of the command switch, the switch member number, and the state of its connectivity with the command switch.
On a command switch, this command displays the cluster name and the total number of members. It also shows the cluster status and time since the status changed. If redundancy is enabled, it displays the primary and secondary command-switch information.
If you enter this command on a switch that is not a cluster member, the error message Not a management cluster member is displayed.
Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output do not appear, but the lines that contain Output appear.
Examples
This is an example of output when this command is entered on the active command switch:
Switch> show clusterCommand switch for cluster "Ajang"Total number of members: 7Status: 1 members are unreachableTime since last status change: 0 days, 0 hours, 2 minutesRedundancy: EnabledStandby command switch: Member 1Standby Group: Ajang_standbyStandby Group Number: 110Heartbeat interval: 8Heartbeat hold-time: 80Extended discovery hop count: 3This is an example of output when this command is entered on a member switch:
Switch> show clusterMember switch for cluster "commander"Member number: 3Management IP address: 192.192.192.192Command switch mac address: 0000.0c07.ac14Heartbeat interval: 8Heartbeat hold-time: 80This is an example of output when this command is entered on a member switch that is configured as the standby command switch:
Switch> show clusterMember switch for cluster "commander"Member number: 3 (Standby command switch)Management IP address: 192.192.192.192Command switch mac address: 0000.0c07.ac14Heartbeat interval: 8Heartbeat hold-time: 80This is an example of output when this command is entered on the command switch that is separated from a member:
Switch> show clusterCommand switch for cluster "Ajang"Total number of members: 7Status: 1 members are unreachableTime since last status change: 0 days, 0 hours, 5 minutesRedundancy: DisabledHeartbeat interval: 8Heartbeat hold-time: 80Extended discovery hop count: 3This is an example of output when this command is entered on a member switch that is separated from the command switch:
Switch> show clusterMember switch for cluster "commander"Member number: <UNKNOWN>Management IP address: 192.192.192.192Command switch mac address: 0000.0c07.ac14Heartbeat interval: 8Heartbeat hold-time: 80Related Commands
show cluster candidates
Use the show cluster candidates user EXEC command on the command switch to display a list of candidate switches.
show cluster candidates [mac-address H.H.H. | detail] [ | {begin | exclude | include} expression]
Syntax Description
Command Modes
User EXEC
Command History
Usage Guidelines
You should only enter this command on a command switch.
If the switch is not a command switch, the command displays an empty line at the prompt.
The SN in the output means switch member number. If E is in the SN column, it means that the switch is discovered through extended discovery. The hop count is the number of devices the candidate is from the command switch.
Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output do not appear, but the lines that contain Output appear.
Examples
This is an example of output from the show cluster candidates command:
Switch> show cluster candidates|---Upstream---|MAC Address Name Device Type PortIf FEC Hops SN PortIf FEC00d0.7961.c4c0 c2950-012 WS-C2950-12 Fa0/5 1 0 Fa0/300d0.bbf5.e900 ldf-dist-128 WS-C3524-XL Fa0/7 1 0 Fa0/2400e0.1e7e.be80 1900_Switch 1900 3 0 1 0 Fa0/1100e0.1e9f.7a00 c2924XL-24 WS-C2924-XL Fa0/5 1 0 Fa0/300e0.1e9f.8c00 c2912XL-12-2 WS-C2912-XL Fa0/4 1 0 Fa0/700e0.1e9f.8c40 c2912XL-12-1 WS-C2912-XL Fa0/1 1 0 Fa0/90050.2e4a.9fb0 C3508XL-0032 WS-C3508-XL E0050.354e.7cd0 C2924XL-0034 WS-C2924-XL EThis is an example of output from the show cluster candidates command that uses the MAC address of a member switch directly connected to the command switch:
Switch> show cluster candidates mac-address 00d0.7961.c4c0Device 'c2950-12' with mac address number 00d0.7961.c4c0Device type: cisco WS-C2950-12Upstream MAC address: 00d0.796d.2f00 (Cluster Member 0)Local port: Fa0/3 FEC number:Upstream port: Fa0/13 FEC Number:Hops from cluster edge: 1Hops from command device: 1This is an example of output from the show cluster candidates command that uses the MAC address of a member switch three hops from the cluster edge:
Switch> show cluster candidates mac-address 0010.7bb6.1cc0Device 'c2950-24' with mac address number 0010.7bb6.1cc0Device type: cisco WS-C2950-24Upstream MAC address: 0010.7bb6.1cd4Local port: Fa2/1 FEC number:Upstream port: Fa0/24 FEC Number:Hops from cluster edge: 3Hops from command device: -This is an example of output from the show cluster candidates detail command:
Switch> show cluster candidates detailDevice 'c2950-12' with mac address number 00d0.7961.c4c0Device type: cisco WS-C2950-12Upstream MAC address: 00d0.796d.2f00 (Cluster Member 1)Local port: Fa0/3 FEC number:Upstream port: Fa0/13 FEC Number:Hops from cluster edge: 1Hops from command device: 2Device '1900_Switch' with mac address number 00e0.1e7e.be80Device type: cisco 1900Upstream MAC address: 00d0.796d.2f00 (Cluster Member 2)Local port: 3 FEC number: 0Upstream port: Fa0/11 FEC Number:Hops from cluster edge: 1Hops from command device: 2Device 'c2924-XL' with mac address number 00e0.1e9f.7a00Device type: cisco WS-C2924-XLUpstream MAC address: 00d0.796d.2f00 (Cluster Member 3)Local port: Fa0/5 FEC number:Upstream port: Fa0/3 FEC Number:Hops from cluster edge: 1Hops from command device: 2Related Commands
Displays the cluster status and a summary of the cluster to which the switch belongs.
Displays information about the cluster members.
show cluster members
Use the show cluster members user EXEC command on the command switch to display information about the cluster members.
show cluster members [n | detail] [ | {begin | exclude | include} expression]
Syntax Description
Command Modes
User EXEC
Command History
Usage Guidelines
You should only enter this command on a command switch.
If the cluster has no members, this command displays an empty line at the prompt.
Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output do not appear, but the lines that contain Output appear.
Examples
This is an example of output from the show cluster members command. The SN in the display means switch number.
Switch> show cluster members|---Upstream---|SN MAC Address Name PortIf FEC Hops SN PortIf FEC State0 0002.4b29.2e00 StLouis1 0 Up (Cmdr)1 0030.946c.d740 tal-switch-1 Fa0/13 1 0 Gi0/1 Up2 0002.b922.7180 nms-2820 10 0 2 1 Fa0/18 Up3 0002.4b29.4400 SanJuan2 Gi0/1 2 1 Fa0/11 Up4 0002.4b28.c480 GenieTest Gi0/2 2 1 Fa0/9 UpThis is an example of output from the show cluster members 3 command for cluster member 3:
Switch> show cluster members 3Device 'SanJuan2' with member number 3Device type: cisco WS-C3550-12TMAC address: 0002.4b29.4400Upstream MAC address: 0030.946c.d740 (Cluster member 1)Local port: Gi0/1 FEC number:Upstream port: Fa0/11 FEC Number:Hops from command device: 2This is an example of output from the show cluster members detail command:
Switch> show cluster members detailDevice 'StLouis1' with member number 0 (Command Switch)Device type: cisco WS-C3550-12TMAC address: 0002.4b29.2e00Upstream MAC address:Local port: FEC number:Upstream port: FEC Number:Hops from command device: 0Device 'tal-switch-14' with member number 1Device type: cisco WS-C3548-XLMAC address: 0030.946c.d740Upstream MAC address: 0002.4b29.2e00 (Cluster member 0)Local port: Fa0/13 FEC number:Upstream port: Gi0/1 FEC Number:Hops from command device: 1Device 'nms-2820' with member number 2Device type: cisco 2820MAC address: 0002.b922.7180Upstream MAC address: 0030.946c.d740 (Cluster member 1)Local port: 10 FEC number: 0Upstream port: Fa0/18 FEC Number:Hops from command device: 2Device 'SanJuan2' with member number 3Device type: cisco WS-C3550-12TMAC address: 0002.4b29.4400Upstream MAC address: 0030.946c.d740 (Cluster member 1)Local port: Gi0/1 FEC number:Upstream port: Fa0/11 FEC Number:Hops from command device: 2Device 'Test' with member number 4Device type: cisco SeaHorseMAC address: 0002.4b28.c480Upstream MAC address: 0030.946c.d740 (Cluster member 1)Local port: Gi0/2 FEC number:Upstream port: Fa0/9 FEC Number:Hops from command device: 2Device 'Palpatine' with member number 5Device type: cisco WS-C2924M-XLMAC address: 00b0.6404.f8c0Upstream MAC address: 0002.4b29.2e00 (Cluster member 0)Local port: Gi2/1 FEC number:Upstream port: Gi0/7 FEC Number:Hops from command device: 1Related Commands
Displays the cluster status and a summary of the cluster to which the switch belongs.
Displays a list of candidate switches.
show current
Use the show current VLAN configuration command to display the VLAN configuration on the switch or a selected VLAN on it.
show current [vlan-id]
Syntax Description
Command Modes
VLAN configuration
Command History
12.0(5.2)WC(1)
This command was first introduced.
12.1(6)EA2
The command mode was changed from VLAN database to VLAN configuration.
Examples
This is an example of output from the show current command:
Switch(vlan)# show currentName: defaultMedia Type: EthernetVLAN 802.10 Id: 100001State: OperationalMTU: 1500Translational Bridged VLAN: 1002Translational Bridged VLAN: 1003Name: fddi-defaultMedia Type: FDDIVLAN 802.10 Id: 101002State: OperationalMTU: 1500Bridge Type: SRBTranslational Bridged VLAN: 1Translational Bridged VLAN: 1003Name: token-ring-defaultMedia Type: Token RingVLAN 802.10 Id: 101003State: OperationalMTU: 1500Bridge Type: SRBRing Number: 0Bridge Number: 1Parent VLAN: 1005Maximum ARE Hop Count: 7Maximum STE Hop Count: 7Backup CRF Mode: DisabledTranslational Bridged VLAN: 1Translational Bridged VLAN: 1002Name: fddinet-defaultMedia Type: FDDI NetVLAN 802.10 Id: 101004State: OperationalMTU: 1500Bridge Type: SRBBridge Number: 1STP Type: IBMName: trnet-defaultMedia Type: Token Ring NetVLAN 802.10 Id: 101005State: OperationalMTU: 1500Bridge Type: SRBBridge Type: SRBBridge Number: 1STP Type: IBMRelated Commands STP Type: IBM
Displays the differences between the current VLAN configuration and the proposed VLAN configuration.
Displays the proposed VLAN configuration for a selected VLAN.
show dot1x
Use the show dot1x privileged EXEC command to display the 802.1X statistics, administrative status, and operational status for the switch or for the specified interface.
show dot1x [statistics] [interface interface-id] [ | {begin | exclude | include} expression]
Syntax Description
Command Modes
Privileged EXEC
Command History
Usage Guidelines
If you do not specify an interface, global parameters and a summary appear. If you specify an interface, details for that interface appear.
If you specify an interface with the statistics keyword, statistics appear for all physical ports.
Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output do not appear, but the lines that contain Output appear.
Examples
This is an example of output from the show dot1x command:
Switch# show dot1xGlobal 802.1X Parametersreauth-enabled noreauth-period 3600quiet-period 60tx-period 30supp-timeout 30server-timeout 30reauth-max 2max-req 2802.1X Port SummaryPort Name Status Mode AuthorizedGi0/1 disabled n/a n/aGi0/2 enabled Auto (negotiate) no802.1X Port Details802.1X is disabled on GigabitEthernet0/1802.1X is enabled on GigabitEthernet0/2Status UnauthorizedPort-control AutoSupplicant 0060.b0f8.fbfbMultiple Hosts DisallowedCurrent Identifier 2Authenticator State MachineState AUTHENTICATINGReauth Count 1Backend State MachineState RESPONSERequest Count 0Identifier (Server) 2Reauthentication State MachineState INITIALIZE
Note
In the 802.1X Port Summary section of the example, the Status column shows whether the port is enabled for 802.1X (the dot1x port-control interface configuration command is set to auto or force-unauthorized). The Mode column shows the operational status of the port; for example, if you configure the dot1x port-control interface configuration command to force-unauthorized, but the port has not transitioned to that state, the Mode column displays auto. If you disable 802.1X, the Mode column displays n/a.
The Authorized column shows the authorization state of the port. For information about port states, refer to the "Configuring 802.1X Port-Based Authentication" chapter in the Catalyst 2950 Desktop Switch Software Configuration Guide.
This is an example of output from the show dot1x interface gigabitethernet0/2 privileged EXEC command. Table 2-4 describes the fields in the example.
Switch# show dot1x interface gigabitethernet0/2802.1X is enabled on GigabitEthernet0/2Status AuthorizedPort-control AutoSupplicant 0060.b0f8.fbfbMultiple Hosts DisallowedCurrent Identifier 3Authenticator State MachineState AUTHENTICATEDReauth Count 0Backend State MachineState IDLERequest Count 0Identifier (Server) 2Reauthentication State MachineState INITIALIZE
Table 2-4 show dot1x interface Field Description
802.1X is enabled on GigabitEthernet0/2
Status
Status of the port (authorized or unauthorized). The status of a port appears as authorized if the dot1x port-control interface configuration command is set to auto, and authentication was successful.
Port-control
Setting of the dot1x port-control interface configuration command.
Supplicant
Ethernet MAC address of the client, if one exists. If the switch has not discovered the client, this field displays Not set.
Multiple Hosts
Setting of the dot1x multiple-hosts interface configuration command (allowed or disallowed).
Current Identifier1
Each exchange between the switch and the client includes an identifier, which matches requests with responses. This number is incremented with each exchange and can be reset by the authentication server.
1 This field and the remaining fields in the example show internal state information. For a detailed description of these state machines and their settings, refer to the IEEE 802.1X standard.
This is an example of output from the show dot1x statistics interface gigiabitethernet0/1 command. Table 2-5 describes the fields in the example.
Switch# show dot1x statistics interface gigabitethernet0/1GigabitEthernet0/1Rx: EAPOL EAPOL EAPOL EAPOL EAP EAP EAPStart Logoff Invalid Total Resp/Id Resp/Oth LenError0 0 0 21 0 0 0Last LastEAPOLVer EAPOLSrc1 0002.4b29.2a03Tx: EAPOL EAP EAPTotal Req/Id Req/Oth622 445 0
Table 2-5 show dot1x statistics Field Descriptions
RX EAPOL1 Start
Number of valid EAPOL-start frames that have been received
RX EAPOL Logoff
Number of EAPOL-logoff frames that have been received
RX EAPOL Invalid
Number of EAPOL frames that have been received and have an unrecognized frame type
RX EAPOL Total
Number of valid EAPOL frames of any type that have been received
RX EAP2 Resp/ID
Number of EAP-response/identity frames that have been received
RX EAP Resp/Oth
Number of valid EAP-response frames (other than response/identity frames) that have been received
RX EAP LenError
Number of EAPOL frames that have been received in which the packet body length field is invalid
Last EAPOLVer
Protocol version number carried in the most recently received EAPOL frame
LAST EAPOLSrc
Source MAC address carried in the most recently received EAPOL frame
TX EAPOL Total
Number of EAPOL frames of any type that have been sent
TX EAP Req/Id
Number of EAP-request/identity frames that have been sent
TX EAP Req/Oth
Number of EAP-request frames (other than request/identity frames) that have been sent
1 EAPOL = Extensible Authentication Protocol over LAN
2 EAP = Extensible Authentication Protocol
Related Commands
show env
Use the show env privileged EXEC command to display fan information for the switch.
show env {all | fan} [ | {begin | exclude | include} expression]
Syntax Description
Command Modes
Privileged EXEC
Command History
Usage Guidelines
Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output do not appear, but the lines that contain Output appear.
Examples
This is an example of output from the show env all command:
Switch# show env allFAN 1 is OKThis is an example of output from the show env fan command:
Switch# show env fanFAN 1 is FAULTYshow errdisable recovery
Use the show errdisable recovery user EXEC command to display the error-disable recovery timer information.
show errdisable recovery [ | {begin | exclude | include} expression]
Syntax Description
Command Modes
User EXEC
Command History
Usage Guidelines
Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output do not appear, but the lines that contain Output appear.
Examples
This is an example of output from the show errdisable recovery command:
Switch> show errdisable recoveryErrDisable Reason Timer Status----------------- --------------udld Enabledbpduguard Enabledrootguard Enabledpagp-flap Enableddtp-flap Enabledlink-flap EnabledTimer interval:300 secondsInterfaces that will be enabled at the next timeout:Interface Errdisable reason Time left(sec)--------- ----------------- --------------Gi0/4 link-flap 279Related Commands
Configures the recover mechanism variables.
Displays interface status or a list of interfaces in error-disabled state.
show etherchannel
Use the show etherchannel user EXEC command to display EtherChannel information for a channel.
show etherchannel [channel-group-number] {brief | detail | load-balance | port | port-channel | summary} [ | {begin | exclude | include} expression]
Syntax Description
Command Modes
User EXEC
Command History
12.1(6)EA2
This command was first introduced. It replaced the show port group command.
Usage Guidelines
If you do not specify a channel-group, all channel groups appear.
Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output do not appear, but the lines that contain Output appear.
Examples
This is an example of output from the show etherchannel 1 detail command:
Switch> show etherchannel 1 detailGroup state = L2Ports: 1 Maxports = 8Port-channels: 1 Max Port-channels = 1Ports in the group:-------------------Port: Fa0/3------------Port state = Down Not-in-BndlChannel group = 1 Mode = Automatic-Sl Gcchange = 0Port-channel = null GC = 0x00000000 Pseudo port-channel = Po1Port index = 0 Load = 0x00Flags: S - Device is sending Slow hello. C - Device is in Consistent state.A - Device is in Auto mode. P - Device learns on physical port.d - PAgP is down.Timers: H - Hello timer is running. Q - Quit timer is running.S - Switching timer is running. I - Interface timer is running.Local information:Hello Partner PAgP Learning GroupPort Flags State Timers Interval Count Priority Method IfindexFa0/3 dA U1/S1 1s 0 200 Any 0Age of the port in the current state: 10d:23h:07m:37sPort-channels in the group:----------------------Port-channel: Po1------------Age of the Port-channel = 03d:02h:22m:43sLogical slot/port = 1/0 Number of ports = 0GC = 0x00000000 HotStandBy port = nullPort state = Port-channel Ag-Not-InuseThis is an example of output from the show etherchannel 1 summary command:
Switch> show etherchannel 1 summaryFlags: D - down P - in port-channelI - stand-alone s - suspendedR - Layer3 S - Layer2U - port-channel in useGroup Port-channel Ports-----+------------+-----------------------------------------------------------1 Po1(SD) Fa0/3(D)This is an example of output from the show etherchannel 1 brief command:
Switch> show etherchannel 1 briefGroup state = L2Ports: 1 Maxports = 8Port-channels: 1 Max Port-channels = 1This is an example of output from the show etherchannel 1 port command:
Switch> show etherchannel 1 portPorts in the group:-------------------Port: Fa0/3------------Port state = Down Not-in-BndlChannel group = 1 Mode = Automatic-Sl Gcchange = 0Port-channel = null GC = 0x00000000 Pseudo port-channel = Po1Port index = 0 Load = 0x00Flags: S - Device is sending Slow hello. C - Device is in Consistent state.A - Device is in Auto mode. P - Device learns on physical port.d - PAgP is down.Timers: H - Hello timer is running. Q - Quit timer is running.S - Switching timer is running. I - Interface timer is running.Local information:Hello Partner PAgP Learning GroupPort Flags State Timers Interval Count Priority Method IfindexFa0/3 dA U1/S1 1s 0 200 Any 0Age of the port in the current state: 10d:23h:13m:21sRelated Commands
Assigns an Ethernet interface to an EtherChannel group.
Accesses or creates the port channel.
show file
Use the show file privileged EXEC command to display a list of open file descriptors, file information, and file system information.
show file {descriptors | information {device:}filename | systems} [ | {begin | exclude |
include} expression]Syntax Description
Command Modes
Privileged EXEC
Command History
12.0(5.2)WC(1)
This command was first introduced.
12.1(6)EA2
The descriptors and information keywords were added.
Usage Guidelines
File descriptors are the internal representations of open files. You can use this command to see if another user has a file open.
Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output do not appear, but the lines that contain Output appear.
Examples
This is an example of output from the show file descriptors command:
Switch# show file descriptorsFile Descriptors:FD Position Open PID Path0 187392 0001 2 tftp://temp/hampton/c2950g.a1 184320 030A 2 flash:c2950-i-m.aTable 2-6 describes the fields in the show file descriptors command output.
This is an example of output from the show file information nvram:startup-config command:
Switch# show file information nvram:startup-confignvram:startup-config:type is ascii textTable 2-7 lists the possible file types for the previous example.
This is an example of output from the show file systems command:
Switch# show file systemsFile Systems:Size(b) Free(b) Type Flags Prefixes* 7741440 433152 flash rw flash:7741440 433152 unknown rw zflash:32768 25316 nvram rw nvram:- - network rw tftp:- - opaque rw null:- - opaque rw system:- - opaque ro xmodem:- - opaque ro ymodem:- - network rw rcp:- - network rw ftp:For this example, Table 2-8 describes the fields in the show file systems command output. Table 2-9 lists the file system types. Table 2-10 lists the file system flags.
Table 2-10 File System Flags
ro
The file system is Read Only.
wo
The file system is Write Only
rw
The file system is Read/Write.
show interface
Use the show interface privileged EXEC command to display the administrative and operational status of a switching (nonrouting) port.
show interface [interface-id | vlan number] [flow-control | status | switchport [allowed-vlan | native-vlan]] [ | {begin | exclude | include} expression]
Syntax Description
Command Modes
Privileged EXEC
Command History
Usage Guidelines
Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output do not appear, but the lines that contain Output appear.
Examples
This is an example of output from the show interface status command:
Switch# show interface statusPort Name Status Vlan Duplex Speed Type------- ------------------ ------------ -------- ------ ------- ----Fa0/1 connected 1 A-Full A-100 100BaseTX/FXFa0/2 connected 1 A-Full A-100 100BaseTX/FXFa0/3 connected 1 A-Full A-100 100BaseTX/FXFa0/4 connected 1 A-Full A-100 100BaseTX/FXFa0/5 connected 1 A-Full A-100 100BaseTX/FXFa0/6 connected 1 A-Full A-100 100BaseTX/FXFa0/7 connected 1 A-Full A-100 100BaseTX/FXFa0/8 connected 1 A-Full A-100 100BaseTX/FXFa0/9 connected 1 A-Full A-100 100BaseTX/FXFa0/10 connected 1 A-Full A-100 100BaseTX/FXFa0/11 connected 1 A-Full A-100 100BaseTX/FXFa0/12 connected 1 A-Full A-100 100BaseTX/FXFa0/13 connected 1 A-Full A-100 100BaseTX/FXFa0/14 connected 1 A-Full A-100 100BaseTX/FXFa0/15 connected 1 A-Full A-100 100BaseTX/FXFa0/16 connected 1 A-Full A-100 100BaseTX/FXFa0/17 connected 1 A-Full A-100 100BaseTX/FXFa0/18 connected 1 A-Full A-100 100BaseTX/FXFa0/19 connected 1 A-Full A-100 100BaseTX/FXFa0/20 connected 1 A-Full A-100 100BaseTX/FXFa0/21 connected 1 A-Full A-100 100BaseTX/FXFa0/22 connected 1 A-Full A-100 100BaseTX/FXFa0/23 connected 1 A-Full A-100 100BaseTX/FXFa0/24 monitoring 1 A-Full A-100 100BaseTX/FXGi0/1 connected 1 Full 1000 1000BaseTGi0/2 connected 1 Full 1000 1000BaseTIn the previous example, Fast Ethernet port 0/24 is a SPAN destination port receiving copies of traffic from SPAN source ports.
This is an example of output from the show interface fastethernet0/2 switchport command. Table 2-11 describes each field in the example.
Switch# show interface fastethernet0/2 switchportName: Fa0/2Switchport: EnabledAdministrative mode: static accessOperational Mode: static accessAdministrative Trunking Encapsulation: dot1qOperational Trunking Encapsulation: dot1qNegotiation of Trunking: DisabledAccess Mode VLAN: 1 (default)Trunking Native Mode VLAN: 1 (default)Trunking VLANs Enabled: NONEPruning VLANs Enabled: NONEPriority for untagged frames: 0Override vlan tag priority: FALSEVoice VLAN: noneAppliance trust: none
Related Commands
Configures a port as static access.
Configures the VLAN membership mode of a port.
show interfaces counters
Use the show interfaces counters privileged EXEC command to display various counters for a specific interface or for all interfaces.
show interfaces [interface-id | vlan vlan-id] counters [broadcast | errors | multicast | trunk | unicast] [ | {begin | exclude | include} expression]
Syntax Description
Command Modes
Privileged EXEC
Command History
Usage Guidelines
If you do not enter any keywords, all counters for all interfaces are included.
Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output do not appear, but the lines that contain Output appear.
Examples
This is an example of output from the show interfaces counters command. It displays all the counters for the switch.
Switch# show interfaces countersPort InOctets InUcastPkts InMcastPkts InBcastPktsGi0/1 23324617 10376 185709 126020Gi0/2 0 0 0 0Port OutOctets OutUcastPkts OutMcastPkts OutBcastPktsGi0/1 4990607 28079 21122 10Gi0/2 1621568 25337 0 0This is an example of output from the show interfaces counters broadcast command. It displays the dropped broadcast traffic for all interfaces.
Switch# show interfaces counters broadcastPort BcastSuppDiscardsGi0/1 1Gi0/2 0This is an example of output from the show interfaces gigabitethernet0/1 counters broadcast command. It displays the dropped broadcast traffic for an interface.
Switch# show interfaces gigabitethernet0/1 counters broadcastPort BcastSuppDiscardsGi0/1 0This is an example of output from the show interfaces counters errors command. It displays the interface error counters for all interfaces.
Switch# show interfaces counters errorsPort Align-Err FCS-Err Xmit-Err Rcv-Err UnderSizeGi0/1 0 0 0 0 0Gi0/2 0 0 0 0 0Port Single-Col Multi-Col Late-Col Excess-Col Carri-Sen Runts GiantsGi0/1 0 0 0 0 0 0 0Gi0/2 0 0 0 0 0 0 0This is an example of output from the show interfaces counters multicast command. It displays the dropped multicast traffic for all interfaces.
Switch# show interfaces counters multicastPort McastSuppDiscardsGi0/1 0Gi0/2 0This is an example of output from the show interfaces counters trunk command. It displays the trunk counters for all interfaces.
Switch# show interfaces counters trunkPort TrunkFramesTx TrunkFramesRx WrongEncapGi0/1 0 0 0Gi0/2 0 0 0This is an example of output from the show interfaces counters unicast command. It displays the dropped unicast traffic for all interfaces.
Switch# show interfaces counters unicastPort UcastSuppDiscardsGi0/1 6872Gi0/2 0Related Commands
Configures broadcast, multicast, and unicast storm control for an interface.
show interfaces
Displays interface characteristics.
show interfaces status
Use the show interfaces status privileged EXEC command to display the status of the interfaces or of the interfaces in error-disabled state.
show interfaces status [interface-id ] [err-disabled] [ | {begin | exclude | include} expression]
Syntax Description
Command Modes
Privileged EXEC
Command History
Usage Guidelines
Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output do not appear, but the lines that contain Output appear.
Examples
This is an example of output from the show interfaces status command. It displays the status of all interfaces.
Switch# show interfaces statusPort Name Status Vlan Duplex Speed TypeFa0/1 zippy disabled 1 auto auto 10/100BaseTXFa0/2 disabled 1 auto auto 10/100BaseTXFa0/3 disabled 1 auto auto 10/100BaseTXFa0/4 monitoring 1 a-full a-100 10/100BaseTXFa0/5 notconnect 0 auto auto 10/100BaseTXFa0/6 disabled 1 auto auto 10/100BaseTXFa0/7 notconnect 0 auto auto 10/100BaseTXFa0/8 disabled 1 auto auto 10/100BaseTXFa0/9 notconnect 1 auto auto 10/100BaseTXFa0/10 disabled 1 auto auto 10/100BaseTXFa0/11 notconnect 1 auto auto 10/100BaseTXFa0/12 disabled 1 auto auto 10/100BaseTXFa0/13 connected trunk a-half a-10 10/100BaseTXFa0/14 disabled 1 auto auto 10/100BaseTXFa0/15 disabled 0 auto auto 10/100BaseTXFa0/16 notconnect 2 auto auto 10/100BaseTXFa0/17 test1 notconnect 1 auto auto 10/100BaseTXFa0/18 disabled 1 auto auto 10/100BaseTX...Fa0/43 disabled 1 auto auto 10/100BaseTXFa0/44 disabled 1 auto auto 10/100BaseTXFa0/45 connected trunk a-full a-100 10/100BaseTXFa0/46 disabled 1 auto auto 10/100BaseTXFa0/47 notconnect 1 auto auto 10/100BaseTXFa0/48 disabled 1 auto auto 10/100BaseTXGi0/1 disabled 1 auto auto 1000BaseSXGi0/2 disabled 1 auto auto unknownPo1 notconnect 1 auto autoIn the previous example, Fast Ethernet port 0/4 is a SPAN destination port receiving copies of traffic from SPAN source ports.
This is an example of output from the show interfaces status err-disabled command. It displays the status of interfaces in the error-disabled state.
Switch# show interfaces status err-disabledPort Name Status ReasonFa0/4 notconnect link-flapinformational error message when the timer expires on a cause--------------------------------------------------------------5d04h:%PM-SP-4-ERR_RECOVER:Attempting to recover from link-flap err-disable state on Fa9/4Switch#Related Commands
show interfaces switchport
Use the show interfaces switchport privileged EXEC command to display the administrative and the perational status of a switching (nonrouting) port.
show interfaces switchport [ | {begin | exclude | include} expression]
Syntax Description
Command Modes
Privileged EXEC
Command History
12.1(6)EA2
This command was first introduced. It replaced the show port protected command.
Usage Guidelines
Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output do not appear, but the lines that contain Output appear.
Examples
This is an example of output from the show interfaces switchport command. It displays the switch-port information for module 1.
Switch# show interfaces switchportName: Fa0/1Switchport: EnabledAdministrative Mode: static accessOperational Mode: downAdministrative Trunking Encapsulation: dot1qNegotiation of Trunking: OffAccess Mode VLAN: 1 (default)Trunking Native Mode VLAN: 1 (default)Trunking VLANs Enabled: ALLPruning VLANs Enabled: 2-1001Protected: falseName: Fa0/2Switchport: EnabledAdministrative Mode: trunkOperational Mode: downAdministrative Trunking Encapsulation: dot1qNegotiation of Trunking: OnAccess Mode VLAN: 1 (default)Trunking Native Mode VLAN: 1 (default)Trunking VLANs Enabled: ALLPruning VLANs Enabled: 2-1001Protected: trueName: Fa0/3Switchport: EnabledAdministrative Mode: trunkOperational Mode: down (suspended member of bundle Po1)Administrative Trunking Encapsulation: dot1qNegotiation of Trunking: OnAccess Mode VLAN: 1 (default)Trunking Native Mode VLAN: 1 (default)Trunking VLANs Enabled: ALLPruning VLANs Enabled: 2-1001Protected: false...This is an example of output from the show interfaces switchport | begin VLAN command:
Switch# show interfaces switchport | begin VLANAccess Mode VLAN: 1 (default)Trunking Native Mode VLAN: 1 (default)Trunking VLANs Enabled: ALLPruning VLANs Enabled: 2-1001Protected: falseName: Fa0/2Switchport: EnabledAdministrative Mode: trunkOperational Mode: downAdministrative Trunking Encapsulation: dot1qNegotiation of Trunking: OnAccess Mode VLAN: 1 (default)Trunking Native Mode VLAN: 1 (default)Trunking VLANs Enabled: ALLPruning VLANs Enabled: 2-1001Protected: trueName: Fa0/3Switchport: EnabledAdministrative Mode: trunkOperational Mode: down (suspended member of bundle Po1)Administrative Trunking Encapsulation: dot1qNegotiation of Trunking: OnAccess Mode VLAN: 1 (default)Trunking Native Mode VLAN: 1 (default)Trunking VLANs Enabled: ALLPruning VLANs Enabled: 2-1001Protected: false...show interfaces trunk
Use the show interfaces trunk privileged EXEC command to display interface-trunk information.
show interfaces trunk [ | {begin | exclude | include} expression]
Syntax Description
Command Modes
Privileged EXEC
Command History
Usage Guidelines
Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output do not appear, but the lines that contain Output appear.
Examples
This is an example of output from the show interfaces trunk command:
Switch# show interfaces trunkPort Mode Encapsulation Status Native vlanFa0/13 on 802.1q trunking 1Fa0/24 on 802.1q trunking 1Fa0/26 on 802.1q trunking 1Fa0/30 on 802.1q trunking 1Fa0/45 on 802.1q trunking 1Port Vlans allowed on trunkFa0/13 1-1005Fa0/24 1-1005Fa0/26 1-1005Fa0/30 1-1005Fa0/45 1-1005Port Vlans allowed and active in management domainFa0/13 1,101,120-130Fa0/24 1,101,120-130Fa0/26 1,101,120-130Fa0/30 1,101,120-130Fa0/45 1,101,120-130Port Vlans in spanning tree forwarding state and not prunedFa0/13 1,101,120-130Port Vlans in spanning tree forwarding state and not prunedFa0/24 1,101,120-130Fa0/26 1,101,120-130Fa0/30 1,101,120-130Fa0/45 1,101,120-130This is an example of output from the show interfaces trunk | include Fa0/13 command:
Switch# show interfaces trunk | include Fa0/13Fa0/13 on 802.1q trunking 1Fa0/13 1-1005Fa0/13 1,101,120-130Fa0/13 1,101,120-130show ip access-lists
Use the show ip access-lists privileged EXEC command to display IP access control lists (ACLs) configured on the switch.
show ip access-lists [name | number] [ | {begin | exclude | include} expression]
Syntax Description
Command Modes
Privileged EXEC
Command History
Usage Guidelines
Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output do not appear, but the lines that contain Output appear.
Examples
This is an example of output from the show ip access-lists command:
Switch# show ip access-listsStandard IP access list testingaclpermit 10.10.10.2Standard IP access list wizard_1-1-1-2permit 1.1.1.2Extended IP access list 103permit tcp any any eq wwwExtended IP access list CMP-NAT-ACLDynamic Cluster-HSRP deny ip any anyDynamic Cluster-NAT permit ip any anypermit ip host 10.245.155.128 anypermit ip host 10.245.137.0 anypermit ip host 10.146.106.192 anypermit ip host 10.216.25.128 anypermit ip host 10.228.215.0 anypermit ip host 10.221.111.64 anypermit ip host 10.123.222.192 anypermit ip host 10.169.110.128 anypermit ip host 10.186.122.64 anyThis is an example of output from the show ip access-lists 103 command:
Switch# show ip access-lists 103Extended IP access list 103permit tcp any any eq wwwRelated Commands
Configures a standard IP ACL on the switch.
Configures an extended IP ACL on the switch.
Configures an IP ACL on the switch.
Displays ACLs configured on a switch.
show ip igmp snooping
Use the show ip igmp snooping privileged EXEC command to display the Internet Group Management Protocol (IGMP) snooping configuration of the switch or the VLAN.
show ip igmp snooping [ | {begin | exclude | include} expression]
show ip igmp snooping [vlan vlan-id] [ | {begin | exclude | include} expression]
Syntax Description
Command Modes
Privileged EXEC
Command History
Usage Guidelines
Use this command to display snooping characteristics for the switch or for a specific VLAN.
Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output do not appear, but the lines that contain Output appear.
Examples
This is an example of output from the show ip igmp snooping command:
Switch# show ip igmp snoopingvlan 1----------IGMP snooping is globally enabledIGMP snooping is enabled on this VlanIGMP snooping immediate-leave is enabled on this VlanIGMP snooping mrouter learn mode is pim-dvmrp on this Vlanvlan 2----------IGMP snooping is globally enabledIGMP snooping is enabled on this VlanIGMP snooping immediate-leave is enabled on this VlanIGMP snooping mrouter learn mode is cgmp on this Vlanvlan 3----------IGMP snooping is globally enabledIGMP snooping is enabled on this VlanIGMP snooping immediate-leave is disabled on this VlanIGMP snooping mrouter learn mode is cgmp on this Vlanvlan 4----------IGMP snooping is globally enabledIGMP snooping is enabled on this VlanIGMP snooping immediate-leave is disabled on this VlanIGMP snooping mrouter learn mode is cgmp on this Vlanvlan 5----------IGMP snooping is globally enabledIGMP snooping is enabled on this VlanIGMP snooping immediate-leave is disabled on this VlanIGMP snooping mrouter learn mode is pim-dvmrp on this Vlanvlan 33----------IGMP snooping is globally enabledIGMP snooping is enabled on this VlanIGMP snooping immediate-leave is disabled on this VlanIGMP snooping mrouter learn mode is pim-dvmrp on this VlanThis is an example of output from the show ip igmp snooping vlan 1 command:
Switch# show ip igmp snooping vlan 1vlan 1----------IGMP snooping is globally enabledIGMP snooping is enabled on this VlanIGMP snooping immediate-leave is enabled on this VlanIGMP snooping mrouter learn mode is pim-dvmrp on this VlanRelated Commands
Enables IGMP snooping.
ip igmp snooping vlan vlan-id
Enables IGMP snooping on the VLAN interface.
Configures IGMP Immediate-Leave processing.
Configures a Layer 2 port as a multicast router port.
Displays the Layer 2 multicast entries for a VLAN.
show ip igmp snooping mrouter
Use the show ip igmp snooping mrouter privileged EXEC command to display information on dynamically learned and manually configured multicast router ports.
show ip igmp snooping mrouter [vlan vlan-id] [ | {begin | exclude | include} expression]
Syntax Description
Command Modes
Privileged EXEC
Command History
Usage Guidelines
You can also use the show mac-address-table multicast command to display entries in the MAC address table for a VLAN that has Internet Group Management Protocol (IGMP) snooping enabled.
Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output do not appear, but the lines that contain Output appear.
Examples
This is an example of output from the show ip igmp snooping mrouter vlan 1 command:
Note
Switch# show ip igmp snooping mrouter vlan 1Vlan ports---- -----1 Fa0/2(static), Fa0/3(dynamic)Related Commands
show mac access-group
Use the show mac access-group privileged EXEC command to display the MAC access control lists (ACLs) configured for an interface or a switch.
show mac access-group [interface interface-id] [ | {begin | exclude | include} expression]
This command is available only if your switch is running the enhanced software image.
Syntax Description
Command Modes
Privileged EXEC
Command History
12.1(6)EA2
This command was first introduced.
12.1(6)EA2b
This command is supported only by the enhanced software image.
Usage Guidelines
Use the show mac access-group command without keywords to display MAC ACLs for all interfaces.
Use this command with the interface keyword to display ACLs for a specific interface.
Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output do not appear, but the lines that contain Output appear.
Examples
This is an example of output from the show mac access-group command:
Switch# show mac access-groupInterface FastEthernet0/1:Inbound access-list is not setInterface FastEthernet0/2:Inbound access-list is not setInterface FastEthernet0/3:Inbound access-list is not setInterface FastEthernet0/4:Inbound access-list is not set...Interface FastEthernet0/47:Inbound access-list is not setInterface FastEthernet0/48:Inbound access-list is not setInterface GigabitEthernet0/1:Inbound access-list is not setInterface GigabitEthernet0/2:Inbound access-list is 101This is an example of output from the show mac access-group interface gigabitethernet 0/2 command:
Switch# show mac access-group interface gigabitethernet 0/2Interface GigabitEthernet0/2:Inbound access-list is 101Related Commands
show mac-address-table
Use the show mac-address-table privileged EXEC command to display the MAC address table.
show mac-address-table [static | dynamic | aging-time | count] [address hw-addr]
[interface interface-id] [vlan vlan-id] [ | {begin | exclude | include} expression]Syntax Description
Command Modes
Privileged EXEC
Command History
Usage Guidelines
This command displays the MAC address table for the switch. Specific views can be defined by using the optional keywords and values. If more than one optional keyword is used, all of the conditions must be true in order for that entry to appear.
Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output do not appear, but the lines that contain Output appear.
Examples
This is an example of output from the show mac-address-table command:
Switch# show mac-address-tableDynamic Addresses Count: 9Secure Addresses (User-defined) Count: 0Static Addresses (User-defined) Count: 0System Self Addresses Count: 41Total MAC addresses: 50Non-static Address Table:Destination Address Address Type VLAN Destination Port------------------- ------------ ---- --------------------0010.0de0.e289 Dynamic 1 FastEthernet0/10010.7b00.1540 Dynamic 2 FastEthernet0/50010.7b00.1545 Dynamic 2 FastEthernet0/50060.5cf4.0076 Dynamic 1 FastEthernet0/10060.5cf4.0077 Dynamic 1 FastEthernet0/10060.5cf4.1315 Dynamic 1 FastEthernet0/10060.70cb.f301 Dynamic 1 FastEthernet0/100e0.1e42.9978 Dynamic 1 FastEthernet0/100e0.1e9f.3900 Dynamic 1 FastEthernet0/1This is an example of output from the show mac-address-table static interface fastethernet0/2 vlan 1 command:
Switch# show mac-address-table static interface fastethernet0/2 vlan 1vlan mac address type ports-----+---------------+--------+---------1 abcd.2345.0099 static Fa0/21 abcd.0070.0070 static Fa0/21 abcd.2345.0099 static Fa0/21 abcd.2345.0099 static Fa0/21 00d0.d333.7f34 static Fa0/21 abcd.2345.0099 static Fa0/21 0005.6667.0007 static Fa0/2This is an example of output from the show mac-address-table count vlan 1 command:
Switch# show mac-address-table count vlan 1MAC Entries for Vlan 1 :Dynamic Address Count: 1Static Address (User-defined) Count: 41Total MAC Addresses In Use:42Remaining MAC addresses: 8150This is an example of output from the show mac-address-table aging-time command:
Switch# show mac-address-table aging-timeVlan Aging Time---- ----------1 4502 3003 600300 450301 450This is an example of output from the show mac-address-table aging-time vlan 1 command:
Switch# show mac-address-table aging-time vlan 1Vlan Aging Time---- ----------1 450Related Commands
show mac-address-table multicast
Use the show mac-address-table multicast privileged EXEC command to display the Layer 2 multicast entries for the switch or for the VLAN.
show mac-address-table multicast [vlan vlan-id] [user | igmp-snooping] [count] [ | {begin | exclude | include} expression]
Syntax Description
Defaults
This command has no default setting.
Command Modes
Privileged EXEC
Command History
12.0(5.2)WC(1)
This command was first introduced.
12.1(6)EA2
The valid VLAN values were changed.
Usage Guidelines
Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output do not appear, but the lines that contain Output appear.
Examples
This is an example of output from the show mac-address-table multicast vlan 1 command:
Switch# show mac-address-table multicast vlan 1Vlan Mac Address Type Ports---- ----------- ---- -----1 0100.5e00.0128 IGMP Fa0/111 0100.5e01.1111 USER Fa0/5, Fa0/6, Fa0/7, Fa0/11This is an example of output from the show mac-address-table multicast count command:
Switch# show mac-address-table multicast countMulticast Mac Entries for all vlans: 10This is an example of output from the show mac-address-table multicast vlan 1 count command:
Switch# show mac-address-table multicast vlan 1 countMulticast Mac Entries for vlan 1: 2This is an example of output from the show mac-address-table multicast vlan 1 user command:
Switch# show mac-address-table multicast vlan 1 uservlan mac address type ports-----+----------------+-------+---------------------1 0100.5e02.0203 user Fa0/1,Fa0/2,Fa0/4This is an example of output from the show mac-address-table multicast vlan 1 igmp-snooping count command:
Switch# show mac-address-table multicast vlan 1 igmp-snooping countNumber of igmp-snooping programmed entries : 1show mac-address-table notification
Use the show mac-address-table notification privileged EXEC command to display parameters for the MAC notification feature.
show mac-address-table notification [interface interface-id] [ | {begin | exclude | include} expression]
Syntax Description
Defaults
This command has no default setting.
Command Modes
Privileged EXEC
Command History
Usage Guidelines
Use the show mac-address-table notification command without keywords to display parameters for all interfaces.
Use this command with the interface keyword to display parameters for a specific interface.
Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output do not appear, but the lines that contain Output appear.
Examples
This is an example of output from the show mac-address-table notification command:
Switch# show mac-address-table notificationMAC Notification Feature is Disabled on the switchRelated Commands
show mls masks
Use the show mls masks privileged EXEC command to display the details of the Access Control Parameters (ACPs) used for quality of service (QoS) and security access control lists (ACLs).
show mls masks [qos | security] [ | {begin | exclude | include} expression]
This command is available only if your switch is running the enhanced software image.
Syntax Description
Note
Command Modes
Privileged EXEC
Command History
12.1(6)EA2
This command was first introduced.
12.1(6)EA2b
This command is supported only by the enhanced software image.
Usage Guidelines
Use the show mls mask command without keywords to display all ACPs configured on the switch.
Use this command with the qos keyword to display the ACPs used for QoS ACLs.
Use this command with the security keyword to display the ACPs used for security ACLs.
Note
Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output do not appear, but the lines that contain Output appear.
Examples
This is an example of output from the show mls masks command:
Switch# show mls masksMask1Type : qosFields : ip-sa(0.0.0.255), ip-da(host), dest-portPolicymap: pmap1Interfaces: Fa0/9, Gi0/1Policymap: pmap2Interfaces: Fa0/1, Fa0/5, Fa0/13Mask2Type : securityFields : mac-sa (host), ethertypeAccess-group: 3Interfaces: Fa0/2, Fa0/6Access-group: macag1Interfaces: Fa0/16In this example, Mask 1 is a QoS ACP consisting an IP source address (with wildcard bits 0.0.0.255), an IP destination address, and Layer 4 destination port fields. This ACP is used by the QoS policy maps pmap1 and pmap2.
Mask 2 is a security ACP consisting of a MAC source address and ethertype fields. This ACP is used by the MAC security access groups 3 and macag1.
Related Commands
show mls qos interface
Use the show mls qos interface privileged EXEC command to display quality of service (QoS) information at the interface level.
show mls qos interface [interface-id] [policers] [ | {begin | exclude | include} expression]
Syntax Description
Note
Command Modes
Privileged EXEC
Command History
12.1(6)EA2
This command was first introduced.
12.1(6)EA2b
The policers keyword is supported only by the enhanced software image.
Usage Guidelines
Though visible in the command-line help string, the policers keyword is available only when your switch is running the enhanced software image.
Use the show mls qos interface command without keywords to display parameters for all interfaces.
Use the show mls qos interface interface-id command to display the parameters for a specific interface.
Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output do not appear, but the lines that contain Output appear.
Examples
This is an example of output from the show mls qos interface fastethernet0/1 command:
Switch# show mls qos interface fastethernet0/1FastEthernet0/1trust state: trust cosCOS override: disdefault COS: 0Related Commands
show mls qos maps
Use the show mls qos maps privileged EXEC command to display quality of service (QoS) mapping information. Maps are used to generate an internal Differentiated Services Code Point (DSCP) value, which represents the priority of the traffic.
show mls qos maps [cos-dscp | dscp-cos] [ | {begin | exclude | include} expression]
This command is available only if your switch is running the enhanced software image.
Syntax Description
Command Modes
Privileged EXEC
Command History
12.1(6)EA2
This command was first introduced.
12.1(6)EA2b
This command is supported only by the enhanced software image.
Usage Guidelines
Use the show mls qos maps command without keywords to display all maps.
Use this command with the cos-dscp keyword to display the CoS-to-DSCP map.
Use this command with the dscp-cos keyword to display the DSCP-to-CoS map.
Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output do not appear, but the lines that contain Output appear.
Examples
This is an example of output from the show mls qos maps cos-dscp command:
Switch# show mls qos maps cos-dscpCos-dscp map:cos: 0 1 2 3 4 5 6 7--------------------------------dscp: 8 8 8 8 24 32 56 56This is an example of output from the show mls qos maps dscp-cos command:
Switch# show mls qos maps dscp-cosDscp-cos map:dscp: 0 8 10 16 18 24 26 32 34 40 46 48 56-----------------------------------------------cos: 0 1 1 1 2 2 3 3 4 4 5 6 7This is an example of output from the show mls qos maps command:
Switch# show mls qos mapsDscp-cos map:dscp: 0 8 10 16 18 24 26 32 34 40 46 48 56-----------------------------------------------cos: 0 1 1 2 2 3 7 4 4 5 5 7 7Cos-dscp map:cos: 0 1 2 3 4 5 6 7--------------------------------dscp: 0 8 16 24 32 40 48 56Related Commands
show monitor
Use the show monitor privileged EXEC command to display Switch Port Analyzer (SPAN) session information.
show monitor [session session-number] [ | {begin | exclude | include} expression]
Syntax Description
Defaults
This command has no default setting.
Command Modes
Privileged EXEC
Command History
12.1(6)EA2
This command was first introduced. It replaced the show port monitor command.
Usage Guidelines
Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output do not appear, but the lines that contain Output appear.
Examples
This is an example of output from the show monitor command:
Switch# show monitorSession 1---------Source Ports:RX Only: NoneTX Only: NoneBoth: NoneDestination Ports: NoneRelated Commands
Enables SPAN monitoring on a port and configures a port as a source or destination port.
show mvr
Use the show mvr privileged EXEC command without keywords to display the Multicast VLAN Registration (MVR) global parameter values, including whether or not MVR is enabled, the MVR multicast VLAN, the maximum query response time, the number of multicast groups, and the MVR mode (dynamic or compatible).
show mvr [ | {begin | exclude | include} expression]
Syntax Description
Command Modes
Privileged EXEC
Command History
Usage Guidelines
Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output do not appear, but the lines that contain Output appear.
Examples
This is an example of output from the show mvr command:
Switch# show mvrMVR Running: TRUEMVR multicast vlan: 1MVR Max Multicast Groups: 256MVR Current multicast groups: 256MVR Global query response time: 5 (tenths of sec)MVR Mode: compatibleIn the previous example, the maximum number of multicast groups is 256. The MVR mode is either compatible (for interoperability with Catalyst 2900 XL and Catalyst 3500 XL switches) or dynamic (where operation is consistent with Internet Group Management Protocol [IGMP] snooping operation, and dynamic MVR membership on source ports is supported).
Related Commands
show mvr interface
Use the show mvr interface privileged EXEC command without keywords to display the Multicast VLAN Registration (MVR) receiver and source ports. Use the command with keywords to display MVR parameters for a specific receiver port.
show mvr interface [interface-id [members [vlan vlan-id]] [ | {begin | exclude | include} expression]
Syntax Description
Command Modes
Privileged EXEC
Command History
Usage Guidelines
If the entered port identification is a non-MVR port or a source port, the command returns an error message. For receiver ports, it displays the port type, per port status, and Immediate-Leave setting.
Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output do not appear, but the lines that contain Output appear.
Examples
This is an example of output from the show mvr interface command:
Switch# show mvr interfacePort Type Status Immediate Leave---- ---- ------- ---------------Gi0/1 SOURCE ACTIVE/UP DISABLEDGi0/2 RECEIVER ACTIVE/DOWN DISABLEDGi0/5 RECEIVER ACTIVE/UP ENABLEDIn the previous example, Status is defined as:
•
•
•
This is an example of output from the show mvr interface gigabitethernet0/2 command:
Switch# show mvr interface gigabitethernet0/2Type: RECEIVER Status: ACTIVE Immediate Leave: DISABLEDThis is an example of output from the show mvr interface gigabitethernet0/6 member command:
Switch# show mvr interface gigabitethernet0/6 member239.255.0.0 DYNAMIC ACTIVE239.255.0.1 DYNAMIC ACTIVE239.255.0.2 DYNAMIC ACTIVE239.255.0.3 DYNAMIC ACTIVE239.255.0.4 DYNAMIC ACTIVE239.255.0.5 DYNAMIC ACTIVE239.255.0.6 DYNAMIC ACTIVE239.255.0.7 DYNAMIC ACTIVE239.255.0.8 DYNAMIC ACTIVE239.255.0.9 DYNAMIC ACTIVERelated Commands
show mvr members
Use the show mvr members privileged EXEC command to display all receiver ports that are members of an IP multicast group.
show mvr members [ip-address] [ | {begin | exclude | include} expression]
Syntax Description
Command Modes
Privileged EXEC
Command History
Usage Guidelines
The show mvr members command only applies to receiver ports. All source ports are members of all multicast groups.
Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output do not appear, but the lines that contain Output appear.
Examples
This is an example of output from the show mvr members command:
Switch# show mvr membersMVR Group IP Status Members------------ ------ -------239.255.0.1 ACTIVE Gi0/1(d), Gi0/2(s)239.255.0.2 INACTIVE None239.255.0.3 INACTIVE None239.255.0.4 INACTIVE None239.255.0.5 INACTIVE None239.255.0.6 INACTIVE None239.255.0.7 INACTIVE None239.255.0.8 INACTIVE None239.255.0.9 INACTIVE None239.255.0.10 INACTIVE None<output truncated>239.255.0.255 INACTIVE None239.255.1.0 INACTIVE NoneThis is an example of output from the show mvr members 239.255.0.2 command. It shows how to view the members of the IP multicast group 239.255.0.2.
Switch# show mvr member 239.255.0.2239.255.0.2 ACTIVE Gi0/1(d), Gi0/2(d)Related Commands
show pagp
Use the show pagp privileged EXEC command to display Port Aggregation Protocol (PAgP) channel-group information.
show pagp [channel-group-number] {counters | internal | neighbor} [ | {begin | exclude | include} expression]
Syntax Description
Command Modes
Privileged EXEC
Command History
Usage Guidelines
You can enter any show pagp command to display the active port channel information. To display the nonactive information, enter the show pagp command with a group number.
Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output do not appear, but the lines that contain Output appear.
Examples
This is an example of output from the show pagp 1 counters command:
Switch# show pagp 1 countersInformation FlushPort Sent Recv Sent Recv--------------------------------------Channel group: 1Gi0/1 45 42 0 0Gi0/2 45 41 0 0This is an example of output from the show pagp 1 internal command:
Switch# show pagp 1 internalFlags: S - Device is sending Slow hello. C - Device is in Consistent state.A - Device is in Auto mode.Timers: H - Hello timer is running. Q - Quit timer is running.S - Switching timer is running. I - Interface timer is running.Channel group 1Hello Partner PAgP Learning GroupPort Flags State Timers Interval Count Priority Method IfindexGi0/1 SC U6/S7 H 30s 1 128 Any 16Gi0/2 SC U6/S7 H 30s 1 128 Any 16This is an example of output from the show pagp 1 neighbor command:
Switch# show pagp 1 neighborFlags: S - Device is sending Slow hello. C - Device is in Consistent state.A - Device is in Auto mode. P - Device learns on physical port.Channel group 1 neighborsPartner Partner Partner Partner GroupPort Name Device ID Port Age Flags Cap.Gi0/1 device-p2 0002.4b29.4600 Gi0/1 9s SC 10001Gi0/2 device-p2 0002.4b29.4600 Gi0/2 24s SC 10001Related Commands
Sets the source-address learning method of incoming packets received from an EtherChannel port.
Clears PAgP channel-group information.
show policy-map
Use the show policy-map privileged EXEC command to display quality of service (QoS) policy maps, which define classification criteria for incoming traffic. Policy maps can include policers that specify the bandwidth limitations and the action to take if the limits are exceeded.
show policy-map [policy-map-name [class class-name]] [ | {begin | exclude | include} expression]
This command is available only if your switch is running the enhanced software image.
Syntax Description
Command Modes
Privileged EXEC
Command History
12.1(6)EA2
This command was first introduced.
12.1(6)EA2b
This command is supported only by the enhanced software image.
Usage Guidelines
Use the show policy-map command without keywords to display all policy maps configured on the switch.
Note
Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output do not appear, but the lines that contain Output appear.
Examples
This is an example of output from the show policy-map command:
Switch# show policy-mapPolicy Map bumbumDescription: this is a description.Policy Map wizard_policy3class wizard_1-1-1-2set ip dscp 34Policy Map testPolicy Map policytestclass classtestset ip dscp 20police 10000000 8192 exceed-action dropThis is an example of output from the show policy-map policytest command:
Switch# show policy-map policytestPolicy Map policytestclass classtestset ip dscp 20police 10000000 8192 exceed-action dropThis is an example of output from the show policy-map policytest class classtest command:
Switch# show policy-map policytest class classtestset ip dscp 20police 10000000 8192 exceed-action dropRelated Commands
Creates or modifies a policy map that can be attached to multiple interfaces to specify a service policy.
show port-security
Use the show port-security privileged EXEC command to display the port security settings defined for an interface or for the switch.
show port-security [interface interface-id] [address] [ | {begin | exclude | include} expression]
Syntax Description
Command Modes
Privileged EXEC
Command History
12.1(6)EA2
This command was first introduced. It replaced the show port security and show mac-address-table secure commands.
Usage Guidelines
If you enter this command without keywords, the output includes the administrative and the operational status of all secure ports on the switch.
If you enter an interface-id, the show port-security command displays port security settings for the interface.
If you enter the address keyword, the show port-security address command displays the secure MAC addresses for all interfaces on which port security is enabled.
If you enter an interface-id and the address keyword, the show port-security interface interface-id address command displays all the MAC addresses for the interface. You can also use this command to display all the MAC addresses for an interface even if you have not enabled port security on it.
Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output do not appear, but the lines that contain Output appear.
Examples
This is an example of output from the show port-security command:
Switch# show port-securitySecure Port MaxSecureAddr CurrentAddr SecurityViolation Security Action(Count) (Count) (Count)-----------------------------------------------------------------------------------------Fa0/8 132 0 0 ShutdownFa0/9 132 5 0 ShutdownFa0/10 132 0 0 ShutdownThis is an example of output from the show port-security interface fastethernet0/2 command:
Switch# show port-security interface fastethernet0/2Security Enabled:No, Port Status:ShutDownViolation Mode:ShutdownMax. Addrs:132, Current Addrs:3, Configure Addrs:3This is an example of output from the show port-security address command:
Switch# show port-security addressSecure Mac Address Table------------------------------------------------------------Vlan Mac Address Type Ports----- ---------------- ------------------ -------1 0001.0002.0003 SecureConfigured Fa0/91 0002.0002.0002 SecureConfigured Fa0/91 0003.0003.0003 SecureConfigured Fa0/91 0004.0005.0006 SecureConfigured Fa0/9This is an example of output from the show port-security interface fastethernet0/5 address command:
Switch# show port-security interface fastethernet0/5 addressSecure Mac Address Table------------------------------------------------------------Vlan Mac Address Type Ports---- ----------- ---- -----1 0005.0005.0005 Secureconfigured Fa0/51 0005.0005.0006 Secureconfigured Fa0/5-----------------------------------------------------Total Addresses:2Related Commands
Enables port security on a port, restricts the use of the port to a user-defined group of stations and configures secure MAC addresses.
show proposed
Use the show proposed VLAN configuration command to display the proposed VLAN configuration or a selected VLAN from it.
show proposed [vlan-id]
Syntax Description
Command Modes
VLAN configuration
Command History
12.0(5.2)WC(1)
This command was first introduced.
12.1(6)EA2
The valid VLAN ID range was changed.The command mode was changed from VLAN database to VLAN configuration.
Usage Guidelines
If the variable vlan-id is omitted, the show proposed command displays the entire proposed VLAN configuration.
The proposed VLAN configuration is not the running configuration until you use the exit or apply command.
Examples
This is an example of output from the show proposed command:
Switch(vlan)# show proposedName: defaultMedia Type: EthernetVLAN 802.10 Id: 100001State: OperationalMTU: 1500Translational Bridged VLAN: 1002Translational Bridged VLAN: 1003Name: fddi-defaultMedia Type: FDDIVLAN 802.10 Id: 101002State: OperationalMTU: 1500Bridge Type: SRBTranslational Bridged VLAN: 1Translational Bridged VLAN: 1003Name: token-ring-defaultMedia Type: Token RingVLAN 802.10 Id: 101003State: OperationalMTU: 1500Bridge Type: SRBRing Number: 0Bridge Number: 1Parent VLAN: 1005Maximum ARE Hop Count: 7Maximum STE Hop Count: 7Backup CRF Mode: DisabledTranslational Bridged VLAN: 1Translational Bridged VLAN: 1002Name: fddinet-defaultMedia Type: FDDI NetVLAN 802.10 Id: 101004State: OperationalMTU: 1500Bridge Type: SRBBridge Number: 1STP Type: IBMName: trnet-defaultMedia Type: Token Ring NetVLAN 802.10 Id: 101005State: OperationalMTU: 1500Maximum ARE Hop Count: 7Maximum STE Hop Count: 7Backup CRF Mode: DisabledTranslational Bridged VLAN: 1Translational Bridged VLAN: 1002Name: fddinet-defaultMedia Type: FDDI NetVLAN 802.10 Id: 101004State: OperationalMTU: 1500Bridge Type: SRBBridge Number: 1STP Type: IBMName: trnet-defaultMedia Type: Token Ring NetVLAN 802.10 Id: 101005State: OperationalMTU: 1500Bridge Type: SRBBridge Number: 1STP Type: IBMRelated Commands
Displays the differences between the current VLAN configuration and the proposed VLAN configuration.
Displays the VLAN configuration on the switch or a selected VLAN from it.
show rps
Use the show rps privileged EXEC command to display the status of the Cisco Redundant Power System (RPS).
show rps [ | {begin | exclude | include} expression]
Syntax Description
Command Modes
Privileged EXEC
Command History
Usage Guidelines
Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output do not appear, but the lines that contain Output appear.
Examples
This is an example of output from the show rps command. Table 2-12 describes the possible output.
Switch# show rpsGREEN
show spanning-tree
Use the show spanning-tree privileged EXEC command to display spanning-tree information for the specified spanning-tree instances.
show spanning-tree [bridge-group] [active | backbonefast | blockedports | bridge | brief | inconsistentports | interface interface-id | pathcost method | root | summary [totals] | uplinkfast | vlan vlan-id] [ | {begin | exclude | include} expression]
Syntax Description
Command Modes
Privileged EXEC
Command History
Usage Guidelines
If the variable vlan-id is omitted, the command applies to the spanning-tree instance for all VLANs.
Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output do not appear, but the lines that contain Output appear.
Examples
This is an example of output from the show spanning-tree summary command:
Switch# show spanning-tree summaryUplinkFast is disabledName Blocking Listening Learning Forwarding STP Active-------------------- -------- --------- -------- ---------- ----------VLAN1 23 0 0 1 24-------------------- -------- --------- -------- ---------- ----------1 VLAN 23 0 0 1 24This is an example of output from the show spanning-tree brief command:
Switch# show spanning-tree briefVLAN1Spanning tree enabled protocol IEEEROOT ID Priority 32768Address 0030.7172.66c4Hello Time 2 sec Max Age 20 sec Forward Delay 15 secVLAN1Spanning tree enabled protocol IEEEROOT ID Priority 32768Address 0030.7172.66c4Port DesignatedName Port ID Prio Cost Sts Cost Bridge ID Port ID------- ------- ---- ---- --- ---- -------------- -------Fa0/11 128.17 128 100 BLK 38 0404.0400.0001 128.17Fa0/12 128.18 128 100 BLK 38 0404.0400.0001 128.18Fa0/13 128.19 128 100 BLK 38 0404.0400.0001 128.19Fa0/14 128.20 128 100 BLK 38 0404.0400.0001 128.20Fa0/15 128.21 128 100 BLK 38 0404.0400.0001 128.21Fa0/16 128.22 128 100 BLK 38 0404.0400.0001 128.22Fa0/17 128.23 128 100 BLK 38 0404.0400.0001 128.23Fa0/18 128.24 128 100 BLK 38 0404.0400.0001 128.24Fa0/19 128.25 128 100 BLK 38 0404.0400.0001 128.25Fa0/20 128.26 128 100 BLK 38 0404.0400.0001 128.26Fa0/21 128.27 128 100 BLK 38 0404.0400.0001 128.27Port DesignatedName Port ID Prio Cost Sts Cost Bridge ID Port ID------- ------- ---- ---- --- ---- -------------- -------Fa0/22 128.28 128 100 BLK 38 0404.0400.0001 128.28Fa0/23 128.29 128 100 BLK 38 0404.0400.0001 128.29Fa0/24 128.30 128 100 BLK 38 0404.0400.0001 128.30 Hello Time 2 sec Max Age 20 sec Forward Delay 15 secThis is an example of output from the show spanning-tree vlan 1 command for VLAN 1:
Switch# show spanning-tree vlan 1Spanning tree 1 is executing the IEEE compatible Spanning Tree protocolBridge Identifier has priority 32768, address 00e0.1eb2.ddc0Configured hello time 2, max age 20, forward delay 15Current root has priority 32768, address 0010.0b3f.ac80Root port is 5, cost of root path is 10Topology change flag not set, detected flag not set, changes 1Times: hold 1, topology change 35, notification 2hello 2, max age 20, forward delay 15Timers: hello 0, topology change 0, notification 0Interface Fa0/1 in Spanning tree 1 is downPort path cost 100, Port priority 128Designated root has priority 32768, address 0010.0b3f.ac80Designated bridge has priority 32768, address 00e0.1eb2.ddc0Designated port is 1, path cost 10Timers: message age 0, forward delay 0, hold 0BPDU: sent 0, received 0...This is an example of output from the show spanning-tree interface fastethernet0/3 command:
Switch# show spanning-tree interface fastethernet0/3Interface Fa0/3 (port 3) in Spanning tree 1 is downPort path cost 100, Port priority 128Designated root has priority 6000, address 0090.2bba.7a40Designated bridge has priority 32768, address 00e0.1e9f.4abfDesignated port is 3, path cost 410Timers: message age 0, forward delay 0, hold 0BPDU: sent 0, received 0Related Commands
show storm-control
Use the show storm-control privileged EXEC command to display the packet-storm control information. This command also displays the action that the switch takes when the thresholds are reached.
show storm-control [interface-id] [{broadcast | multicast | unicast | history}] [ | {begin | exclude | include} expression]
Syntax Description
Command Modes
Privileged EXEC
Command History
12.1(6)EA2
This command was first introduced. It replaced the show port storm-control command.
Usage Guidelines
If the variable interface-id is omitted, the show storm-control command displays storm-control settings for all ports on the switch.
You can display broadcast, multicast, or unicast packet-storm information by using the corresponding keyword. When no option is specified, the default is to display broadcast storm-control information.
Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output do not appear, but the lines that contain Output appear.
Examples
This is an example of output from the show storm-control broadcast command:
Switch# show storm-control broadcastInterface Filter State Trap State Upper Lower Current Traps Sent--------- ------------- ------------- ------- ------- ------- ----------Fa0/1 <inactive> <inactive> 100.00% 100.00% 0.00% 0Fa0/2 <inactive> <inactive> 100.00% 100.00% 0.00% 0Fa0/3 <inactive> <inactive> 100.00% 100.00% 0.00% 0Fa0/4 Forwarding Below rising 30.00% 20.00% 20.32% 17. . . .Table 2-13 lists the show storm-control field descriptions.
This is an example of output from the show storm-control fastethernet0/4 history command, which displays the ten most recent storm events for an interface.
Switch# show storm-control fastethernet0/4 historyInterface Fa0/4 Storm Event HistoryEvent Type Event Start Time Duration (seconds)------------------ ---------------- ------------------Unicast 04:58:18 206Broadcast 05:01:54 n/aMulticast 05:01:54 n/aUnicast 05:01:54 108Broadcast 05:05:00 n/aMulticast 05:05:00 n/aUnicast 05:06:00 n/aBroadcast 05:09:39 n/aMulticast 05:09:39 n/aBroadcast 05:11:32 172
Note
Related Commands
show system mtu
Use the show system mtu privileged EXEC command to display the global maximum packet size or maximum transmission unit (MTU) set for the switch.
show system mtu [ | {begin | exclude | include} expression]
Syntax Description
Command Modes
Privileged EXEC
Command History
Usage Guidelines
Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output do not appear, but the lines that contain Output appear.
Examples
This is an example of output from the show system mtu command:
Switch# show system mtuSystem MTU size is 1500 bytesRelated Commands
show udld
Use the show udld privileged EXEC command to display UniDirectional Link Detection (UDLD) status for all ports or the specified port.
show udld [interface-id] [ | {begin | exclude | include} expression]
Syntax Description
Command Modes
Privileged EXEC
Command History
Usage Guidelines
If you do not enter an interface-id, the administrative and the operational UDLD status for all interfaces appear.
Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output do not appear, but the lines that contain Output appear.
Examples
This is an example of output from the show udld gigabitethernet0/1 command. In this example, UDLD is enabled on both ends of the link, and UDLD detects that the link is bidirectional. Table 2-14 describes the fields in this example.
Switch# show udld gigabitethernet0/1Interface gi0/1---Port enable administrative configuration setting: Follows device defaultPort enable operational state: EnabledCurrent bidirectional state: BidirectionalCurrent operational state: Advertisement - Single Neighbor detectedMessage interval: 60Time out interval: 5Entry 1Expiration time: 146Device ID: 1Current neighbor state: BidirectionalDevice name: 0050e2826000Port ID: Gi0/2Neighbor echo 1 device: SAD03160954Neighbor echo 1 port: Gi0/1Message interval: 5CDP Device name: 066527791
Table 2-14 show udld Field Descriptions
Interface
The interface on the local device configured for UDLD.
Port enable administrative configuration setting
How UDLD is configured on the port. If UDLD is enabled or disabled, the port enable configuration setting is the same as the operational enable state. Otherwise, the enable operational setting depends on the global enable setting.
Port enable operational state
Operational state that shows whether UDLD is actually running on this port.
Current bidirectional state
The bidirectional state of the link. An unknown state appears if the link is down or if it is connected to an UDLD-incapable device. A bidirectional state appears if the link is a normal two-way connection to a UDLD-capable device. All other values mean miswiring.
Current operational state
The phase of the UDLD state machine. For a normal bidirectional link, the state machine is usually in the Advertisement phase.
Message interval
How often advertisement messages are sent from the local device. Measured in seconds.
Time out interval
The time period, in seconds, that UDLD waits for echoes from a neighbor device during the detection window.
Entry 1
Information from the first cache entry, which contains a copy of echo information received from the neighbor.
Expiration time
The amount of time in seconds remaining before this cache entry is aged out.
Device ID
The neighbor device identification.
Current neighbor state
The neighbor's state. If both the local and neighbor devices are running UDLD, the neighbor state and the local state is bidirectional. If the link is down or the neighbor is not UDLD-capable, no cache entries appear.
Device name
The neighbor MAC address.
Port ID
The neighbor port ID enabled for UDLD.
Neighbor echo 1 device
The MAC address of the neighbors' neighbor from which the echo originated.
Neighbor echo 1 port
The port number ID of the neighbor from which the echo originated.
Message interval
The rate, in seconds, at which the neighbor is sending advertisement messages.
CDP1 device name
CDP name of the device.
1 CDP = Cisco Discovery Protocol
Related Commands
Enables UDLD on a port.
Enables UDLD on all ports on the switch.
Resets any interface that was shut down by UDLD.
show version
Use the show version privileged EXEC command to display version information for the hardware and firmware.
show version [ | {begin | exclude | include} expression]
Syntax Description
Command Modes
Privileged EXEC
Command History
Usage Guidelines
Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output do not appear, but the lines that contain Output appear.
Examples
This is an example of output from the show version command:
Switch# show versionCisco Internetwork Operating System SoftwareIOS (tm) C2950 Software (C2950-I6Q4L2-M), Version 12.1(6)EA2Copyright (c) 1986-2001 by cisco Systems, Inc.Compiled Thu 18-Oct-01 06:15 by devgoyalImage text-base: 0x80010000, data-base: 0x803F4000ROM: Bootstrap program is C2950 boot loaderSwitch uptime is 22 hours, 2 minutesSystem returned to ROM by power-onSystem image file is "flash:c2950-i6q4l2-mz-121.0.0.27-EA2.bin"cisco WS-C2950G-48 (RC32300) processor with 21416K bytes of memory.Last reset from system-reset48 FastEthernet/IEEE 802.3 interface(s)2 Gigabit Ethernet/IEEE 802.3 interface(s)32K bytes of flash-simulated non-volatile configuration memory.Base ethernet MAC Address: 00:03:FD:62:1C:00Configuration register is 0xFshow vlan
Use the show vlan privileged EXEC command to display the parameters for all configured VLANs or one VLAN (if the VLAN ID or name is specified) in the administrative domain.
show vlan [brief | id vlan-id | name vlan-name] [ | {begin | exclude | include} expression]
Syntax Description
Command Modes
Privileged EXEC
Command History
Usage Guidelines
Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output do not appear, but the lines that contain Output appear.
Examples
This is an example of output from the show vlan command:
Switch# show vlanVLAN Name Status Ports---- -------------------------------- --------- -------------------------------1 default active Fa0/1, Fa0/2, Fa0/3, Fa0/4,Fa0/5, Fa0/6, Fa0/7, Fa0/8,Fa0/9, Fa0/10, Fa0/11, Fa0/12,Fa0/13, Fa0/14, Fa0/15, Fa0/16,Fa0/17, Fa0/18, Fa0/19, Fa0/20,Fa0/21, Fa0/22, Fa0/23, Fa0/24,Gi0/1, Gi0/21002 fddi-default active1003 token-ring-default active1004 fddinet-default active1005 trnet-default activeVLAN Type SAID MTU Parent RingNo BridgeNo Stp Trans1 Trans2---- ----- ---------- ----- ------ ------ -------- ---- ------ ------1 enet 100001 1500 - - - - 1002 10036 fdnet 100006 1500 - - - ieee 0 07 trnet 100007 1500 - - 5 ieee 0 01002 fddi 101002 1500 - - - - 1 10031003 tr 101003 1500 1005 3276 - - 1 10021004 fdnet 101004 1500 - - 1 ibm 0 01005 trnet 101005 1500 - - 15 ibm 0 0This is an example of output from the show vlan brief command:
Switch# show vlan briefVLAN Name Status Ports---- -------------------------------- --------- -------------------------------1 default active Fa0/1, Fa0/2, Fa0/5, Fa0/6,Fa0/7, Fa0/8, Fa0/9, Fa0/10,Fa0/11, Fa0/12, Fa0/13, Fa0/14,Fa0/15, Fa0/16, Fa1/1, Fa1/2,Fa1/3, Fa1/4, Fa2/3, Fa2/42 VLAN0002 active3 VLAN0003 active6 VLAN0006 active7 VLAN0007 active1002 fddi-default active1003 token-ring-default active1004 fddinet-default active1005 trnet-default activeThis is an example of output from the show vlan id 6 or show vlan name VLAN006 command:
Switch# show vlan id 6VLAN Name Status Ports---- -------------------------------- --------- -------------------------------6 VLAN0006 activeVLAN Type SAID MTU Parent RingNo BridgeNo Stp Trans1 Trans2---- ----- ---------- ----- ------ ------ -------- ---- ------ ------6 fdnet 100006 1500 - - - ieee 0 0Related Commands
show vmps
Use the show vmps privileged EXEC command without keywords to display the VLAN Query Protocol (VQP) version, reconfirmation interval, retry count, VLAN Membership Policy Server (VMPS) IP addresses, and the current and primary servers, or use the statistics keyword to display client-side statistics.
show vmps [statistics] [ | {begin | exclude | include} expression]
Syntax Description
Command Modes
Privileged EXEC
Command History
Usage Guidelines
Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output do not appear, but the lines that contain Output appear.
Examples
This is an example of output from the show vmps command:
Switch# show vmpsVQP Client Status:--------------------VMPS VQP Version: 1Reconfirm Interval: 60 minServer Retry Count: 3VMPS domain server:Reconfirmation status---------------------VMPS Action: otherThis is an example of output from the show vmps statistics command. Table 2-15 describes each field in the example.
Switch# show vmps statistics
