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
Syntax Description
Defaults
The default extended ACL is always terminated by an implicit deny statement for all packets.
Command Modes
Global configuration
Command History
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
Syntax Description
Defaults
The default standard ACL is always terminated by an implicit deny statement for all packets.
Command Modes
Global configuration
Command History
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
Syntax Description
Defaults
No policy-map class maps are defined.
Command Modes
Policy-map configuration
Command History
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. When you are in this 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
Syntax Description
Defaults
No class maps are defined.
Command Modes
Global configuration
Command History
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
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]
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
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]
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
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:
•
•
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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.
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
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
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}
Syntax Description
Defaults
No named or numbered IP ACLs are defined.
Command Modes
Global configuration
Command History
Usage Guidelines
Use this command to specify the name or number of the IP ACL for which you want to create or modify ACL match criteria and to enter access-list configuration mode. In this mode, you must enter the permit and deny commands to configure the permit and deny access conditions for this list.
The ip access-list 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 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 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
Syntax Description
Defaults
No MAC ACL is applied to the interface.
Command Modes
Interface configuration
Command History
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
Syntax Description
Defaults
No MAC ACLs are created.
Command Modes
Global configuration
Command History
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 create a MAC extended ACL named mac1 and to enter extended MAC access-list configuration mode:
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-or-name}
no match {access-group acl-index-or-name}
Syntax Description
Defaults
No match criteria are defined.
Command Modes
Class-map configuration
Command History
Usage Guidelines
The match command is used 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 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}
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
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]
Syntax Description
Defaults
The port is not trusted. If no keyword is specified, the default is dscp.
Command Modes
Interface configuration
Command History
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]
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
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]
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
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}]
Syntax Description
Defaults
No policers are defined.
Command Modes
Policy-map class configuration
Command History
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 crea
