Table Of Contents
clear spanning-tree detected-protocols
deny (access-list configuration)
deny (MAC access-list configuration)
ip igmp snooping source-only-learning
ip igmp snooping vlan immediate-leave
mac address-table notification
permit (access-list configuration)
permit (MAC access-list configuration)
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
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 this 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] [dscp dscp-value] [time-range time-range-name]
no access-list access-list-number
This command is available on physical interfaces only if your switch is running the enhanced software image (EI).
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 and Catalyst 2955 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 ACLs configured on the switch.
Displays IP 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 this command to remove a standard IP ACL.
access-list access-list-number {deny | permit | remark} {source source-wildcard | host source | any}
no access-list access-list-number
This command is available on physical interfaces only if your switch is running the enhanced software image (EI).
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 command 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 ACLs configured on the switch.
Displays IP ACLs configured on the switch.
auto qos voip
Use the auto qos voip interface configuration command to configure automatic quality of service (auto-QoS) for voice over IP (VoIP) within a QoS domain. Use the no form of this command to change the auto-QoS configuration settings to the standard-QoS defaults.
auto qos voip {cisco-phone | trust}
no auto qos voip
This command is available only if your switch is running the enhanced software image (EI).
Syntax Description
Defaults
Auto-QoS is disabled on all interfaces.
When auto-QoS is enabled, it uses the ingress packet label to categorize traffic and to configure the egress queues as summarized in Table 2-1.
Table 2-1 Traffic Types, Ingress Packet Labels, Assigned Packet Labels, and Egress Queues
Ingress DSCP3
46
26
-
-
-
Ingress CoS
5
3
6
7
-
Assigned DSCP
46
26
48
56
0
Assigned CoS
5
3
6
7
0
CoS-to-Queue Map
5
3, 6, 7
0, 1, 2, 4
Egress Queue
Expedite queue
80% WRR4
20% WRR
1 STP = Spanning Tree Protocol
2 BPDU = bridge protocol data unit
3 DSCP = Differentiated Services Code Point
4 WRR = weighted round robin
Table 2-2 lists the auto-QoS configuration for the egress queues.
Table 2-2 Auto-QoS Configuration for the Egress Queues
Expedite
4
5
-
80% WRR
3
3, 6, 7
80%
20% WRR
1
0, 1, 2, 4
20%
Command Modes
Interface configuration
Command History
Usage Guidelines
Use this command to configure the QoS that is appropriate for VoIP traffic within the QoS domain. The QoS domain includes the switch, the interior of the network, and the edge devices that can classify incoming traffic for QoS.
Use the cisco-phone keyword on ports connected to Cisco IP phones at the edge of the network. The switch detects the phone through the Cisco Discovery Protocol (CDP) and trusts the QoS labels in packets received from the phone.
Use the trust keyword on ports connected to the interior of the network. Because it is assumed that traffic has already been classified by other edge devices, the QoS labels in these packets from the interior of the network are trusted.
When you enable the auto-QoS feature on the first interface, these automatic actions occur:
•
•
You can enable auto-QoS on static, dynamic-access, voice VLAN access, and trunk ports.
To display the QoS configuration that is automatically generated when auto-QoS is enabled, enable debugging before you enable auto-QoS. Use the debug autoqos privileged EXEC command to enable auto-QoS debugging.
To disable auto-QoS on an interface, use the no auto qos voip interface configuration command. When you enter this command, the switch changes the auto-QoS settings to the standard-QoS default settings for that interface.
To disable auto-QoS on the switch, use the no auto qos voip interface configuration command on all interfaces on which auto-QoS is enabled. When you enter this command on the last interface on which auto-QoS is enabled, the switch enables pass-through mode.
Examples
This example shows how to enable auto-QoS and to trust the QoS labels received in incoming packets when the switch or router connected to Gigabit Ethernet interface 0/1 is a trusted device:
Switch(config)# interface gigabitethernet0/1Switch(config-if)# auto qos voip trustThis example shows how to enable auto-QoS and to trust the QoS labels received in incoming packets when the device connected to Fast Ethernet interface 0/1 is detected as a Cisco IP phone:
Switch(config)# interface fastethernet0/1Switch(config-if)# auto qos voip cisco-phoneThis example shows how to display the QoS configuration that is automatically generated when auto-QoS is enabled:
Switch# debug autoqosAutoQoS debugging is onSwitch# configure terminalEnter configuration commands, one per line. End with CNTL/Z.Switch(config)# interface fastethernet0/10Switch(config-if)# auto qos voip cisco-phone00:02:54:wrr-queue bandwidth 20 1 80 000:02:55:no wrr-queue cos-map00:02:55:wrr-queue cos-map 1 0 1 2 400:02:56:wrr-queue cos-map 3 3 6 700:02:58:wrr-queue cos-map 4 500:02:59:mls qos map cos-dscp 0 8 16 26 32 46 48 5600:03:00:interface FastEthernet0/1000:03:00: mls qos trust device cisco-phone00:03:00: mls qos trust cosSwitch(config-if)# interface fastethernet0/12Switch(config-if)# auto qos voip trust00:03:15:interface FastEthernet0/1200:03:15: mls qos trust cosSwitch(config-if)#You can verify your settings by entering the show auto qos interface interface-id privileged EXEC command.
Related Commands
boot private-config-file
Use the boot private-config-file global configuration command to specify the filename that IOS uses to read and write a nonvolatile copy of the private configuration. Use the no form of this command to return to the default setting.
boot private-config-file filename
no boot private-config-file
Syntax Description
Defaults
The default configuration file is private-config.text.
Command Modesb
Global configuration
Command History
Usage Guidelines
Only the IOS software can read and write a copy of the private configuration file. You cannot read, write, delete, or display a copy of this file.
Filenames are case sensitive.
Examples
This example shows how to specify the name of the private configuration file as pconfig:
Switch(config)# boot private-config-file pconfigRelated 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 | active | passive}
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.
12.1(12c)EA1
The active and passive keywords were added.
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 PAgP 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, sends packets. A example of a silent partner is a file server or a packet analyzer that is not generating traffic. In this case, running PAgP on a physical port prevents that port from ever becoming operational; however, it allows PAgP to operate, to attach the interface to a channel group, and to use the interface for transmission. Both ends of the link cannot be set to silent.
Note
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 onThis example shows how to set an Etherchannel into PAgP mode:
Switch(config-if)# channel-group 1 mode autoCreating a port-channel interface Port-channel 1This example shows how to set an Etherchannel into LACP mode:
Switch(config-if)# channel-group 1 mode passiveCreating a port-channel interface Port-channel 1You can verify your settings by entering the show etherchannel or show running-config privileged EXEC command.
Related Commands
channel-protocol
Use the channel-protocol interface configuration command to configure an EtherChannel for the Port Aggregation Protocol (PAgP) or Link Aggregation Control Protocol (LACP). Use the no form of this command to disable PAgP or LACP on the EtherChannel.
channel-protocol {lacp | pagp}
no channel-protocol
Syntax Description
lacp
Configure an EtherChannel with the LACP protocol.
pagp
Configure an EtherChannel with the PAgP protocol.
Defaults
No protocol is assigned to the EtherChannel.
Command Modes
Interface configuration
Command History
Usage Guidelines
Use the channel-protocol command only to restrict a channel to LACP or PAgP.
You must use the channel-group interface command to configure the EtherChannel parameters. The channel-group command can also set the EtherChannel for a channel.
Note
Caution
Examples
This example shows how to set an EtherChannel into PAgP mode:
Switch(config-if)# channel-protocol pagpThis example shows how to set an EtherChannel into LACP mode:
Switch(config-if)# channel-protocol lacpYou can verify your settings by entering the 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 name acl-index-or-name]
no class class-map-name
This command is available only if your switch is running the enhanced software image (EI).
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. 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 [match-all]
no class-map class-map-name [match-all]
This command is available only if your switch is running the enhanced software image (EI).
Syntax Description
class-map-name
Name of the class map.
match-all
(Optional) Perform a logical-AND of all matching statements under this class map. All criteria in the class map must be matched.
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 criterion 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
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 interfaces privileged EXEC command.
clear lacp
Use the clear lacp privileged EXEC command to clear Link Aggregration Control Protocol (LACP) channel-group information.
clear lacp {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 lacp 4This example shows how to clear channel-group traffic counters:
Switch# clear lacp countersYou can verify that the information was deleted by entering the show lacp privileged EXEC command.
Related Commands
clear mac address-table
Use the clear mac address-table privileged EXEC command to delete from the MAC address table a specific dynamic address, all dynamic addresses on a particular interface, or all dynamic addresses on a particular VLAN. This command also clears the MAC address notification global counters.
clear mac address-table {dynamic [address mac-addr | interface interface-id | vlan vlan-id] | notification}
Note
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] | 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 port-security dynamic
Use the clear port-security dynamic privileged EXEC command to delete from the MAC address table a specific dynamic secure address or all the dynamic secure addresses on an interface.
clear port-security dynamic [address mac-addr | interface interface-id]
Syntax Description
Defaults
No default is defined.
Command Modes
Privileged EXEC
Command History
Examples
This example shows how to remove a specific dynamic secure address from the MAC address table:
Switch# clear port-security dynamic address 0008.0070.0007This example shows how to remove all the dynamic secure addresses learned on a specific interface:
Switch# clear port-security dynamic interface gigabitethernet0/1This example shows how to remove all the dynamic secure addresses from the address table:
Switch# clear port-security dynamicYou can verify that the information was deleted by entering the show port-security privileged EXEC command.
Related Commands
Displays the port security settings defined for an interface or for the switch.
Enables port security on an interface.
switchport port-security mac-address mac-address
Configures secure MAC addresses.
switchport port-security maximum value
Configures a maximum number of secure MAC addresses on a secure interface.
clear port-security sticky
Use the clear port-security sticky privileged EXEC command to delete from the secure MAC address table a specific sticky secure address, all the sticky secure addresses on an interface, or all the sticky secure addresses on the switch.
clear port-security sticky [address mac-addr | interface interface-id]
Syntax Description
address mac-addr
(Optional) Delete the specified sticky secure MAC address.
interface interface-id
(Optional) Delete all the sticky secure MAC addresses on the specified physical port.
Defaults
No default is defined.
Command Modes
Privileged EXEC
Usage Guidelines
If you enter the clear port-security sticky privileged EXEC command without keywords, the switch removes all sticky secure MAC addresses from the secure MAC address table.
If you enter the clear port-security sticky address mac-addr command, the switch removes the specified secure MAC address from the secure MAC address table.
If you enter the clear port-security sticky interface interface-id command, the switch removes all sticky secure MAC addresses on an interface from the secure MAC address table.
Command History
Examples
This example shows how to remove a specific sticky secure address from the secure MAC address table:
Switch# clear port-security sticky address 0008.0070.0007This example shows how to remove all the sticky secure addresses learned on a specific interface:
Switch# clear port-security sticky interface gigabitethernet0/1This example shows how to remove all the sticky secure addresses from the secure MAC address table:
Switch# clear port-security stickyYou can verify that the information was deleted by entering the show port-security address privileged EXEC command.
Related Commands
show port-security address
Displays the port security settings defined for an interface or for the switch.
Enables port security on an interface.
switchport port-security mac-address sticky
Enables the interface for sticky learning.
switchport port-security mac-address sticky mac-address
Specifies a sticky secure MAC address
switchport port-security maximum value
Configures a maximum number of secure MAC addresses on a secure interface.
clear spanning-tree counters
Use the clear spanning-tree counters privileged EXEC command to clear the spanning-tree counters.
clear spanning-tree counters [interface interface-id]
Syntax Description
interface interface-id
(Optional) Clear all spanning-tree counters on the specified interface. If interface-id is not specified, spanning-tree counters are cleared for all interfaces.
Defaults
No default is defined.
Command Modes
Privileged EXEC
Command History
Examples
This example shows how to clear spanning-tree counters for all interfaces:
Switch# clear spanning-tree countersRelated Commands
clear spanning-tree detected-protocols
Use the clear spanning-tree detected-protocols privileged EXEC command to restart the protocol migration process (force the renegotiation with neighboring switches) on all interfaces or on the specified interface.
clear spanning-tree detected-protocols [interface interface-id]
This command is available only if your switch is running the enhanced software image (EI).
Syntax Description
Command Modes
Privileged EXEC
Command History
Usage Guidelines
A switch running both the Multiple Spanning Tree Protocol (MSTP) and the Rapid Spanning Tree Protocol (RSTP) supports a built-in protocol migration mechanism that enables it to interoperate with legacy 802.1D switches. If an MSTP and RSTP switch receives a legacy 802.1D configuration bridge protocol data unit (BPDU) with the protocol version set to 0, it sends only 802.1D BPDUs on that port. A multiple spanning-tree (MST) switch can also detect that a port is at the boundary of a region when it receives a legacy BPDU, an MST BPDU (version 3) associated with a different region, or an RST BPDU (version 2).
However, the switch does not automatically revert to the MSTP mode if it no longer receives 802.1D BPDUs because it cannot determine whether the legacy switch has been removed from the link unless the legacy switch is the designated switch. Use the clear spanning-tree detected-protocols command in this situation.
Examples
This example shows how to restart the protocol migration process on Fast Ethernet interface 0/1:
Switch# clear spanning-tree detected-protocols interface fastethernet0/1clear 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 privileged EXEC command.
Related Commands
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 the 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 privileged 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 this 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 privileged 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 its cluster members so that the setting is consistent among all switches in the cluster.
The holdtime is typically set as a multiple of the interval timer (cluster timer). For example, it takes (holdtime-in-secs divided by 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 privileged 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 4094 when the enhanced software image (EI) is installed and 1 to 1001 when the standard software image (SI) is installed.
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 changes the management VLAN of the command switch and member switches. Member switches must have either a trunk connection or connection to the new command-switch management VLAN to maintain communication with 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 interfaces vlan vlan-id privileged EXEC command.
Related Commands
Displays the administrative and operational status of a switching (nonrouting) port.
cluster member
Use the cluster member global configuration command on the command switch to add members to a cluster. Use the no form of this command to remove members from the cluster.
cluster member [n] mac-address H.H.H [password enable-password] [vlan vlan-id]
no cluster member n
Syntax Description
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 you enter this command on a switch other than the command switch, the switch rejects the command and displays an error message.
You must enter a member number to remove a switch from the cluster. However, you do not need to enter a member number to add a switch to the cluster. The command switch selects the next available member number and assigns it to the switch that is joining the cluster.
You must enter the enable password of the candidate switch for authentication when it joins the cluster. The password is not saved in the running or startup configuration. After a candidate switch becomes a member of the cluster, its password becomes the same as the command-switch password.
If a switch does not have a configured host name, the command switch appends a member number to the command-switch host name and assigns it to the member switch.
If you do not specify a VLAN ID, the command switch automatically chooses a VLAN and adds the candidate to the cluster.
Examples
This example shows how to add a switch as member 2 with MAC address 00E0.1E00.2222 and the password key to a cluster. The command switch adds the candidate to the cluster through VLAN 3.
Switch(config)# cluster member 2 mac-address 00E0.1E00.2222 password key vlan 3This example shows how to add a switch with MAC address 00E0.1E00.3333 to the cluster. This switch does not have a password. The command switch selects the next available member number and assigns it to the switch joining the cluster:
Switch(config)# cluster member mac-address 00E0.1E00.3333You can verify your settings by entering the show cluster members privileged 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 privileged EXEC command.
Related Commands
Displays the cluster status and a summary of the cluster to which the switch belongs.
cluster standby-group
Use the cluster standby-group global configuration command to enable command switch redundancy by binding the 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 (my_hsrp) group does not 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 on a cluster command switchYou can verify your settings by entering the show cluster privileged EXEC command.
Related Commands
Displays the cluster status and a summary of the cluster to which the switch belongs.
show standby
Displays standby group information.
standby ip
Enables HSRP on the interface.
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 so that the setting is consistent among all switches in the cluster.
The holdtime is typically set as a multiple of the heartbeat interval timer (cluster timer). For example, it takes (holdtime-in-secs divided by the interval-in-secs) number of heartbeat messages to be missed in a row to declare a switch down.
Examples
This example shows how to change the heartbeat interval timer and the duration on the command switch.
Switch(config)# cluster timer 3Switch(config)# cluster holdtime 30You can verify your settings by entering the show cluster privileged EXEC command.
Related Commands
Displays the cluster status and a summary of the cluster to which the switch belongs.
define interface-range
Use the define interface-range global configuration command to create an interface-range macro. Use the no form of this command to delete the defined macro.
define interface-range macro-name interface-range
no define interface-range macro-name interface-range
Syntax Description
macro-name
Name of the interface-range macro; up to 32 characters.
interface-range
Interface range; for valid values for interface ranges, see "Usage Guidelines."
Defaults
This command has no default setting.
Command Modes
Global configuration
Command History
Usage Guidelines
The macro name is a 32-character maximum character string.
A macro can contain up to five ranges.
All interfaces in a range must be the same type; that is, all Fast Ethernet ports, all Gigabit Ethernet ports, all EtherChannel ports, or all VLANs, but you can combine multiple interface types in a macro.
When entering the interface-range, use this format:
•
•
Valid values for type and interface:
•
•
•
•
VLAN interfaces must have been configured with the interface vlan command (the show running-config privileged EXEC command displays the configured VLAN interfaces). VLAN interfaces not displayed by the show running-config command cannot be used in interface-ranges.
For physical interfaces, the interface-id is defined as a slot/number (where slot is always 0 for the switch), and the range can be entered as type 0/number - number (for example, gigabitethernet0/1 - 2). You can also enter multiple ranges.
When you define a range, you must enter a space before and after the hyphen (-):
interface range gigabitethernet0/1 - 2When you define multiple ranges, you must enter a space before and after the comma (,):
interface range fastethernet0/3 - 7 , gigabitethernet0/1 - 2Examples
This example shows how to create a multiple-interface macro:
Switch(config)# define interface-range macro1 fastethernet 0/3 -7 , gigabitethernet 0/2Related Commands
delete
Use the delete privileged EXEC command to delete a file or directory on the Flash memory device.
delete [/force] [/recursive] filesystem:/file-url
Syntax Description
Command Modes
Privileged EXEC
Command History
12.0(5.2)WC(1)
This command was first introduced.
12.1(6)EA2
The /force and /recursive keywords were added.
Usage Guidelines
If you use the /force keyword, you are prompted once at the beginning of the deletion process to confirm the deletion.
If you use the /recursive keyword without the /force keyword, you are prompted to confirm the deletion of every file.
The prompting behavior depends on the setting of the file prompt global configuration command. By default, the switch prompts for confirmation on destructive file operations. For more information about this command, refer to the Cisco IOS Command Reference for Release 12.1.
Examples
This example shows how to 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 this 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] [dscp dscp-value] [time-range time-range-name]
no deny protocol {source source-wildcard | host source | any} [operator port] {destination destination-wildcard | host source | any} [operator port] [dscp dscp-value] [time-range time-range-name]
This command is available on physical interfaces only if your switch is running the enhanced software image (EI).
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 condition:
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 this 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 | appletalk | 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 | appletalk | dec-spanning | decnet-iv | diagnostic | dsm | etype-6000 | etype-8042 | lat | lavc-sca | mop-console | mop-dump | msdos | mumps | netbios | vines-echo |vines-ip | xns-idp]
This command is available only if your switch is running the enhanced software image (EI).
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 behavioral 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 Description
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 output. 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.
Related Commands
Displays 802.1X statistics, administrative status, and operational status for the switch or for the specified interface.
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 timeout 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 {auto | full | half}
no duplex
Syntax Description
auto
Port automatically detects whether it should run in full- or half-duplex mode.
full
Port is in full-duplex mode.
half
Port is in half-duplex mode.
Defaults
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
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
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 | dtp-flap | gbic-invalid | link-flap | pagp-flap}
no errdisable detect cause {all | dtp-flap | gbic-invalid | link-flap | pagp-flap}
Syntax Description
Defaults
The default is all, enabled for all causes.
Command Modes
Global configuration
Command History
12.1(6)EA2
This command was first introduced.
12.1(9)EA1
The bpduguard, rootguard, and udld keywords were removed. The gbic-invalid keyword was added.
Usage Guidelines
A cause (dtp-flap, gbic-invalid, link-flap, and pagp-flap) 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 link-flap error-disable cause:
Switch(config)# errdisable detect cause link-flapYou can verify your settings by entering the show errdisable detect privileged EXEC command.
Related Commands
Configures the recovery mechanism variables.
show errdisable detect
Displays errdisable detection status.
show interfaces trunk
Displays interface status or a list of interfaces in error-disabled state.
errdisable recovery
Use the errdisable recovery global configuration command to configure the recover mechanism variables. Use the no form of this command to return to the default setting.
errdisable recovery {cause {all | bpduguard | channel-misconfig | dtp-flap | gbic-invalid | link-flap | pagp-flap | psecure-violation | udld} | {interval interval}
no errdisable recovery {cause {all | bpduguard | channel-misconfig | dtp-flap | gbic-invalid | link-flap | pagp-flap | psecure-violation | udld} | {interval interval}
Syntax Description
Defaults
Recovery is disabled for all causes.
The default interval is 300 seconds.
Command Modes
Global configuration
Command History
Usage Guidelines
A cause (bpduguard, channel-misconfig, dtp-flap, gbic-invalid, link-flap, pagp-flap, psecure-violation, and udld) is defined as the reason why the error-disabled state occurred. When a cause is detected on an interface, the interface is placed in error-disabled state, an operational state similar to link-down state. If you do not enable errdisable recovery for the cause, the interface stays in error-disabled state until you enter a shutdown and no shutdown interface configuration command. If you enable the recovery for a cause, the interface is brought out of the error-disabled state and allowed to retry the operation again when all the causes have timed out.
Otherwise, you must enter the shutdown then no shutdown commands to manually recover an interface from the error-disabled state.
Examples
This example shows how to enable the recovery timer for the BPDU guard error-disable cause:
Switch(config)# errdisable recovery cause bpduguardThis example shows how to set the timer to 500 seconds:
Switch(config)# errdisable recovery interval 500You can verify your settings by entering the show errdisable recovery privileged EXEC command.
Related Commands
Displays errdisable recovery timer information.
show interfaces status
Displays interface status.
flowcontrol
Use the flowcontrol interface configuration command to set the receive or send flow-control value for an interface. When flow control send is on for a device and it detects any congestion at its end, it notifies the link partner or the remote device of the congestion by sending a pause frame. When flow control receive is on for the remote device and it receives a pause frame, it stops sending any data packets. This prevents any loss of data packets during the congestion period.
Use the receive off and send off keywords to disable flow control.
flowcontrol {receive | send} {desired | off | on}
Note
Syntax Description
Defaults
The defaults for 10/100/1000 and GBIC-module ports are flowcontrol receive off and flowcontrol send desired.
Command Modes
Interface configuration
Command History
12.0(5.2)WC(1)
This command was first introduced.
12.1(6)EA2
The asymmetric and symmetric keywords were replaced with the receive, send, off, on, and desired keywords.
Usage Guidelines
Use the flowcontrol command only on 10/100/1000 and GBIC-module ports.
We strongly recommend that you do not configure IEEE 802.3X flowcontrol when quality of service (QoS) is configured on the switch. Before configuring flowcontrol on an interface, make sure to disable QoS on the switch.
Note that when used with receive, the on and desired keywords have the same result.
When you use the flowcontrol command to set a port to control traffic rates during congestion, you are setting flow control on a port to one of these conditions:
•
•
•
•
•
•
Table 2-3 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 {interface-id | vlan number}
no interface {interface-id | vlan number}
Syntax Description
Defaults
The default management VLAN interface is VLAN 1.
Command Modes
Global configuration
Command History
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 interfaces and show interfaces vlan vlan-id 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
interface range
Use the interface range global configuration command to enter interface range configuration mode and to execute a command on multiple ports at the same time. Use the no form of this command to remove an interface range.
interface range {port-range | macro name}
no interface range {port-range | macro name}
Syntax Description
port-range
Port range. For a list of valid values for port-range, see the "Usage Guidelines" section.
macro name
Specify the name of a macro.
Defaults
This command has no default setting.
Command Modes
Global configuration
Command History
Usage Guidelines
From the interface range configuration mode, all interface parameters that you enter are applied to all interfaces within the range.
For VLANs, you can use the interface range command only on existing VLAN interfaces. To display VLAN interfaces, enter the show running-config privileged EXEC command. VLANs not displayed cannot be used in the interface range command. The commands that you enter under the interface range command are applied to all existing VLAN interfaces in the range.
All configuration changes made to an interface range are saved to nonvolatile RAM (NVRAM), but the interface range itself is not saved to NVRAM.
You can enter the interface range in two ways:
•
•
You can define up to five interface ranges with a single command, with each range separated by a comma (,).
All interfaces in a range must be the same type; that is, all Fast Ethernet ports, all Gigabit Ethernet ports, all EtherChannel ports, or all VLANs.
These are the valid values for port-range type and interface:
•
•
•
•
For physical interfaces, the interface-id is defined as a slot/number (where slot is always 0 for the switch), and the range is entered as type 0/number - number (for example, gigabitethernet0/1 - 2). You can also enter multiple ranges.
When you define a range, you must enter a space before and after the hyphen (-):
interface range gigabitethernet0/1 - 2When you define multiple ranges, you must enter a space before and after the comma (,):
interface range fastethernet0/3 - 7 , gigabitethernet0/1 - 2You cannot specify both a macro and an interface range in the same command.
A single interface can also be specified in port-range. (The command is then similar to the interface interface-id global configuration command.)
Note
Examples
This example shows how to use the interface range command to enter interface range configuration mode and to enter commands for two ports:
Switch(config)# interface range gigabitethernet0/1 - 2Switch(config-if-range)#This example shows how to use a port-range macro macro1 for the same function. The advantage is that you can reuse the macro1 until you delete it.
Switch(config)# define interface-range macro gigabitethernet0/1 - 2Switch(config)# interface range macro macro1Switch(config-if-range)#Related Commands
ip access-group
Use the ip access-group interface configuration command to control access to an interface. Use the no form of this command to remove an access group from an interface.
ip access-group {access-list-number | name} in
no ip access-group {access-list-number | name} in
This command is available on physical interfaces only if your switch is running the enhanced software image (EI).
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 {extended | standard} {access-list-number | name}
no ip access-list {extended | standard} {access-list-number | name}
This command is available on physical interfaces only if your switch is running the enhanced software image (EI).
Syntax Description
Defaults
No named or numbered IP ACLs are defined.
Command Modes
Global configuration
Command History
Usage Guidelines
Use this command to enter access-list configuration mode and to specify the name or number of the IP ACL for which you want to create or modify ACL match criteria. In this mode, you must enter the permit and deny commands to configure the permit and deny access conditions for this list.
Use the ip access-list command and its subcommands to define packet classification and marking as part of a globally-named service policy applied on a per-interface basis or as an IP access group applied on a per-interface basis.
Specifying standard or extended with the ip access-list command determines the prompt that you get when you enter access-list configuration mode.
Note
Examples
This example shows how to configure a standard ACL named Internetfilter1:
Switch(config)# ip access-list standard Internetfilter1Switch(config-std-nacl)# permit 192.5.34.0 0.0.0.255Switch(config-std-nacl)# permit 192.5.32.0 0.0.0.255Switch(config-std-nacl)# exitThis example shows how to configure an extended ACL named Internetfilter2:
Switch(config)# ip access-list extended Internetfilter2Switch(config-ext-nacl)# permit any 128.8.10.0 0.0.0.255 eq 80Switch(config-ext-nacl)# permit any 128.5.8.0 0.0.0.255 eq 80Switch(config-ext-nacl)# exit
Note
You can verify your settings by entering the show access-lists or show ip access-lists privileged EXEC command.
Related Commands
ip address
Use the ip address interface configuration command to set an IP address for a switch. Use the no form of this command to remove an IP address or to disable IP processing.
ip address ip-address subnet-mask
no ip address ip-address subnet-mask
Syntax Description
Defaults
No IP address is defined for the switch.
Command Modes
Interface configuration
Command History
Usage Guidelines
A switch can have one IP address.
The IP address of the switch can be accessed only by nodes connected to ports that belong to the management VLAN. The default for 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 or Secure Shell (SSH) 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
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 source-only-learning
Use the ip igmp snooping source-only-learning global configuration command to enable IP multicast-source-only learning on the switch. Use the no form of this command to disable IP multicast-source-only learning.
ip igmp snooping source-only-learning
no ip igmp snooping source-only-learning
Syntax Description
This command has no arguments or keywords.
Defaults
IP multicast-source-only learning is enabled.
Command Modes
Global configuration
Command History
Usage Guidelines
When IP multicast-source-only learning is enabled, the switch learns the IP multicast group from the IP multicast data stream and only forwards traffic to the multicast router ports.
Note
Examples
This example shows how to disable source-only learning:
Switch(config)# no ip igmp snooping source-only-learningThis example shows how to enable source-only learning:
Switch(config)# ip igmp snooping source-only-learningYou can verify your settings by entering the show running-config | include source-only-learning 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
vlan-id
VLAN ID. The range is from 1 to 4094 when the enhanced software image (EI) is installed and 1 to 1001 when the standard software image (SI) is installed.
Defaults
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 vlan 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
vlan-id
VLAN ID value. The range is between 1 to 4094 when the enhanced software image (EI) is installed and 1 to 1001 when the standard software image (SI) is installed.
Defaults
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
lacp port-priority
Use the lacp port-priority interface configuration command to set the port priority for the Link Aggregration Control Protocol (LACP). Use the no form of this command to return to the default setting.
lacp port-priority priority-value
no lacp port-priority
Syntax Description
Defaults
The default priority value is 32768.
Command Modes
Interface configuration
Command History
Usage Guidelines
This command only takes effect on EtherChannel interfaces that are already configured for LACP.
Note
Examples
This example shows set the port priority for LACP:
Switch(config)# lacp port-priority 32764You can verify your settings by entering the show etherchannel privileged EXEC command.
Related Commands
lacp system-priority
Use the lacp system-priority global configuration command to set the system priority for Link Aggregration Control Protocol (LACP). Use the no form of this command to return to the default setting.
lacp system-priority priority-value
no lacp system-priority
Syntax Description
Defaults
The default priority value is 32768.
Command Modes
Global configuration
Command History
Usage Guidelines
Although this is a global configuration command, the priority only takes effect on EtherChannels that have physical interfaces with LACP enabled.
Note
Examples
This example shows set the system priority for LACP:
Switch(config)# lacp system-priority 32764You can verify your settings by entering the show lacp sys-id privileged EXEC command.
Related Commands
mac access-group
Use the mac access-group interface configuration command to apply a named extended MAC access control list (ACL) to an interface. Use the no form of this command to remove a MAC ACL from an interface.
mac access-group name in
no mac access-group name in
This command is available only if your switch is running the enhanced software image (EI).
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 ACLs configured on the switch.
Displays the MAC ACLs configured on the switch.
mac access-list extended
Use the mac access-list extended global configuration command to create an access control list (ACL) based on MAC addresses. Using this command changes the mode to extended MAC access-list configuration mode. Use the no form of this command to return to the default setting.
mac access-list extended name
no mac access-list extended name
This command is available only if your switch is running the enhanced software image (EI).
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 enter extended MAC access-list configuration mode and to create a MAC extended ACL named mac1:
Switch(config)# mac access-list extended mac1Switch(config-ext-macl)#This example shows how to delete the MAC extended ACL named mac1:
Switch(config)# no mac access-list extended mac1You can verify your settings by entering the show access-lists privileged EXEC command.
Related Commands
Creates a class map to be used for matching packets to the class whose name you specify and to enter class-map configuration mode.
{deny (MAC access-list configuration) | permit (MAC access-list configuration)}
Configures a MAC ACL.
Applies a MAC ACL to an interface.
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]
Note
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
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 example shows 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 [history-size size | interval interval]
no mac address-table notification [history-size size | interval interval]
Note
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 1.
Command Modes
Global configuration
Command History
12.1(6)EA2
This command was first introduced.
12.1(11)EA1
The mac-address-table notification command was replaced by the mac address-table notification command.
Usage Guidelines
The MAC address notification feature sends Simple Network Management Protocol (SNMP) traps to the network management system (NMS) whenever a 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
clear mac address-table notification
Clears the MAC address notification global counters.
Displays the MAC address notification settings for all interfaces or the specified interface.
Sends the SNMP MAC notification traps when the mac-notification keyword is appended.
Enables the SNMP MAC notification trap on a specific interface.
mac address-table static
Use the mac address-table static global configuration command to add static addresses to the MAC address table. Use the no form of this command to remove static entries from the MAC address table.
mac address-table static mac-addr vlan vlan-id interface interface-id
no mac address-table static mac-addr vlan vlan-id interface interface-id
Note
Syntax Description
Defaults
None configured.
Command Modes
Global configuration
Command History
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 interface:
Switch(config)# mac address-table static c2f3.220a.12f4 vlan 4 interface gigabitethernet0/1You 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
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 | access-group name acl-name | ip dscp dscp-list}
no match {access-group acl-index | access-group name acl-name | ip dscp}
This command is available only if your switch is running the enhanced software image (EI).
Syntax Description
Defaults
No match criteria are defined.
Command Modes
Class-map configuration
Command History
Usage Guidelines
Use the match command to specify which fields in the incoming packets are examined to classify the packets. Only IP access groups, MAC access groups, and classification based on DSCP values are supported.
Only one match command per class map is supported.
Note
Examples
This example shows how to classify traffic on an interface by using the access group named acl2:
Switch(config)# class-map class2Switch(config-cmap)# match access-group name acl2Switch(config-cmap)# exitYou can verify your settings by entering the show class-map privileged EXEC command.
Related Commands
mls qos cos
Use the mls qos cos interface configuration command to define the default class of service (CoS) value of a port or to assign the default CoS to all incoming packets on the port. Use the no form of this command to return to the default setting.
mls qos cos {default-cos | override}
no mls qos cos {default-cos | override}
Syntax Description
Defaults
The default CoS value for a port is 0.
CoS override is disabled.
Command Modes
Interface configuration
Command History
Usage Guidelines
You can use the default value to assign CoS and DSCP values to all packets entering a port if the port has been configured by using the override keyword.
Use the override keyword when all incoming packets on certain ports deserve higher or lower priority than packets entering from other ports. Even if a port was previously set to trust DSCP or CoS, this command overrides that trust state, and all the incoming CoS values are assigned the default CoS value configured with the mls qos cos command. If an incoming packet is tagged, the CoS value of the packet is modified with the default CoS of the port at the ingress port.
Examples
This example shows how to configure the default port CoS to 4:
Switch(config)# interface gigabitethernet0/1Switch(config-if)# mls qos trust cosSwitch(config-if)# mls qos cos 4This example shows how to assign all the packets entering a port to the default port CoS value of 4:
Switch(config)# interface gigabitethernet0/1Switch(config-if)# mls qos cos 4Switch(config-if)# mls qos cos overrideYou can verify your settings by entering the show mls qos interface privileged EXEC command.
Related Commands
Defines the CoS-to-DSCP map or the DSCP-to-CoS map.
Configures the port trust state.
Displays quality of service (QoS) information.
mls qos map
Use the mls qos map global configuration command to define the class of service (CoS)-to-Differentiated Services Code Point (DSCP) map or DSCP-to-CoS map. Use the no form of this command to return to the default map.
mls qos map {cos-dscp dscp1...dscp8 | dscp-cos dscp-list to cos}
no mls qos map {cos-dscp | dscp-cos}
This command is available only if your switch is running the enhanced software image (EI).
Syntax Description
Defaults
Table 2-4 shows the default CoS-to-DSCP map:
Table 2-5 shows the default DSCP-to-CoS map:
Table 2-5 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 an 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 the 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 [pass-through dscp] | device cisco-phone | dscp]
no mls qos trust [cos [pass-through dscp] | device cisco-phone | dscp]
Syntax Description
Defaults
The port is not trusted.
Pass-through mode is disabled.
Trusted boundary is disabled.
If no keyword is specified and the switch is running the EI, the default is dscp.
Command Modes
Interface configuration
Command History
12.1(6)EA2
This command was first introduced.
12.1(11)EA1
The device cisco-phone and pass-through dscp keywords were added.
Usage Guidelines
Packets entering a quality of service (QoS) domain are classified at the edge of the QoS domain. When the packets are classified at the edge, the switch port within the QoS domain can be configured to one of the trusted states because there is no need to classify the packets at every switch within the domain. Use this command to specify whether the port is trusted and which fields of the packet to use to classify traffic.
When a port is configured with trust DSCP and the incoming packet is a tagged non-IP packet, the CoS value for the packet is set to 0, and the DSCP-to-CoS map is not applied. For an untagged non-IP packet, the default port CoS value is used.
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, the 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.
To return a port to the untrusted state, use the no mls qos trust interface configuration command.
The trusted boundary feature prevents security problems if users disconnect their PCs from networked Cisco IP phones and connect them into the switch port to take advantage of trusted CoS settings. You must globally enable the Cisco Discovery Protocol (CDP) on both the switch and on the interface connected to the IP phone. If the phone is not detected, trusted boundary disables the trust setting on the switch port and prevents misuse of a high-priority queue.
If trusted boundary is enabled and the no mls qos trust command is entered, the port returns to the untrusted state and cannot be configured to trust if it is connected to a Cisco IP phone.
To disable trusted boundary, use the no mls qos trust device interface configuration command.
In software releases earlier than Release 12.1(11)EA1, the switch is in pass-through mode. It uses the CoS value of incoming packets without modifying the DSCP value and sends the packets from one of the four egress queues. You cannot enable or disable pass-through mode if your switch is running a software release earlier than Release 12.1(11)EA1.
In Release 12.1(11)EA1 or later, pass-through mode is disabled by default. The switch assigns a CoS value of 0 to all incoming packets without modifying the packets. It offers best-effort service to each packet regardless of the packet contents or size and sends it from a single egress queue.
You can enable pass-through mode on a switch running Release 12.1(11)EA1 or later by using the mls qos trust cos pass-through dscp interface configuration command. To disable pass-through mode, use the no mls qos trust cos pass-through interface configuration command.
Note
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 dscp
Note
This example shows how to specify that the Cisco IP phone is a trusted device:
Switch(config)# interface fastethernet0/1Switch(config-if)# mls qos trust device cisco-phoneThis example shows how to configure the interface to trust the CoS of incoming packets and to send them without modifying the DSCP field:
Switch(config)# interface fastethernet0/1Switch(config-if)# mls qos trust cos pass-through 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 start a new Switched Port Analyzer (SPAN) or Remote SPAN (RSPAN) session. Use the no form of this command to remove the SPAN or the RSPAN session or to remove source or destination interfaces from the SPAN or RSPAN session.
monitor session session_number {destination {interface interface-id [encapsulation {dot1q}] [ingress vlan vlan id] | remote vlan vlan-id reflector-port interface-id} | {source {interface interface-id [, | -] [both | rx | tx ] | remote vlan vlan-id}}
no monitor session session_number {destination {interface interface-id [encapsulation {dot1q}] [ingress vlan vlan id] | remote vlan vlan-id reflector-port interface-id} | {source {interface interface-id [, | -] [both | rx | tx ] | remote vlan vlan-id}}
