Table Of Contents

cd

clear acllog

clear alias

clear arp

clear banner motd

clear boot auto-config

clear boot device

clear boot system

clear cam

clear cam notification

clear channel statistics

clear config

clear config pvlan

clear cops

clear counters

clear crypto key rsa

clear dot1x config

clear dot1x guest-vlan

clear gmrp statistics

clear gvrp statistics

clear igmp statistics

clear ip alias

clear ip dns domain

clear ip dns server

clear ip permit

clear ip route

clear kerberos clients mandatory

clear kerberos credentials forward

clear kerberos creds

clear kerberos realm

clear kerberos server

clear key config-key

clear l2protocol-tunnel cos

clear l2protocol-tunnel statistics

clear lacp-channel statistics

clear lda

clear localuser

clear log

clear log command

clear logging buffer

clear logging level

clear logging server

clear mls cef

clear mls entry

clear mls entry cef adjacency

clear mls exclude protocol

22

cd

To set the default Flash device for the system, use the cd command.

cd [[m/]device:]

Syntax Description

m/	(Optional) Module number of the supervisor engine containing the Flash device.
device:	(Optional) Valid devices include bootflash and slot0.

Defaults

The default Flash device is bootflash.

Command Types

Switch command.

Command Modes

Normal.

Usage Guidelines

A colon (:) is required after the specified device.

With commands where the device is an option, if the default device is not specified, the device set by the cd command is used.

Examples

This example shows how to set the system default Flash device to bootflash:

Console> cd bootflash:

Default flash device set to bootflash.

Console> 

Related Commands

pwd

clear acllog

To disable ACL log rate limiting, use the clear acllog command.

clear acllog

Syntax Description

This command has no arguments or keywords.

Defaults

This command has no default settings.

Command Types

Switch command.

Command Modes

Privileged.

Examples

This example shows how to disable ACL log rate limiting:

Console> (enable) clear acllog

ACL log rate limit is cleared.

If the ACLs-LOG were already applied, the rate limit mechanism will be disabled on system 

restart, or after shut/no shut the interface.

Console> (enable) 

Related Commands

set acllog ratelimit
show acllog

clear alias

To clear the abbreviated versions of commands, use the clear alias command.

clear alias {name | all}

Syntax Description

name	Alternate identifier of the command.
all	Clears every alternate identifier previously created.

Defaults

This command has no default settings.

Command Types

Switch command.

Command Modes

Privileged.

Examples

This example shows how to erase the arpdel alias:

Console> (enable) clear alias arpdel

Command alias deleted.

Console> (enable)

This example shows how to erase all the aliases:

Console> (enable) clear alias all

Command alias table cleared. (1)

Console> (enable)

(1) indicates the number of command aliases cleared.

Related Commands

set alias
show alias

clear arp

To delete a specific entry or all entries from the ARP table, use the clear arp command.

clear arp [all | dynamic | permanent | static] {ip_addr}

Syntax Description

all	(Optional) Clears all ARP entries.
dynamic	(Optional) Clears all dynamic ARP entries.
permanent	(Optional) Clears all permanent ARP entries.
static	(Optional) Clears all static ARP entries.
ip_addr	IP address to clear from the ARP table.

Defaults

This command has no default settings.

Command Types

Switch command.

Command Modes

Privileged.

Examples

This example shows how to remove IP address 198.133.219.209 from the ARP table:

Console> (enable) clear arp 198.133.219.209

ARP entry deleted.

Console> (enable)

This example shows how to remove all entries from the ARP table:

Console> (enable) clear arp all

ARP table cleared. (1)

Console> (enable)

(1) indicates the number of entries cleared.

This example shows how to remove all dynamically learned ARP entries:

Console> (enable) clear arp dynamic

Unknown host

Dynamic ARP entries cleared. (3)                 

Console> (enable)

This example shows how to clear all permanently entered ARP entries:

Console> (enable) clear arp permanent

Unknown host

Permanent ARP entries cleared.(5)

Console> (enable) 

Related Commands

set arp
show arp

clear banner motd

To clear the message-of-the-day banner, use the clear banner motd command.

clear banner motd

Syntax Description

This command has no arguments or keywords.

Defaults

This command has no default settings.

Command Types

Switch command.

Command Modes

Privileged.

Examples

This example shows how to clear the message-of-the-day banner:

Console> (enable) clear banner motd

MOTD banner cleared

Console> (enable)

Related Commands

set banner motd

clear boot auto-config

To clear the contents of the CONFIG_FILE environment variable used to specify the configuration files used during bootup, use the clear boot auto-config command.

clear boot auto-config [mod]

Syntax Description

mod	(Optional) Module number of the supervisor engine containing the Flash device.

Defaults

This command has no default settings.

Command Types

Switch command.

Command Modes

Privileged.

Examples

This example shows how to clear the auto-config file:

Console> (enable) clear boot auto-config

CONFIG_FILE variable =

Console> (enable)

Related Commands

set boot auto-config
show boot

clear boot device

To clear the contents of the CONFIG_FILE environment variable used to specify the NAM startup configuration files used, use the clear boot device command.

clear boot device mod

Syntax Description

mod	Number of the module containing the Flash device.

Defaults

This command has no default settings.

Command Types

Switch command.

Command Modes

Privileged.

Usage Guidelines

This command is supported by the NAM module only.

Examples

This example shows how to clear the NAM boot string from NVRAM for module 2:

Console> (enable) clear boot device 2

Device BOOT variable =

Console> (enable)

Related Commands

set boot device
show boot device

clear boot system

To clear the contents of the BOOT environment variable and the configuration register setting, use the clear boot system command.

clear boot system all [mod]

clear boot system flash device:[filename] [mod]

Syntax Description

all	Clears the whole BOOT environment variable.
mod	(Optional) Module number of the supervisor engine containing the Flash device.
flash	(Optional) Clears the Flash device.
device:	Name of the Flash device.
filename	(Optional) Filename of the Flash device.

Defaults

This command has no default settings.

Command Types

Switch command.

Command Modes

Privileged.

Examples

This example shows how to clear the whole BOOT environment variable:

Console> (enable) clear boot system all

BOOT variable = 

Console> (enable)

This example shows how to clear a specific device; note how the specified device is not listed:

Console> (enable) clear boot system flash bootflash:cat6000-sup.5-5-1.bin

BOOT variable = bootflash:cat6000-sup.6-1-1.bin,1;bootflash:cat6000-sup.5-5-2.

bin,1;

Console> (enable)

Related Commands

set boot system flash
show boot

clear cam

To delete a specific entry or all entries from the CAM table, use the clear cam command.

clear cam mac_addr [vlan]

clear cam {dynamic | static | permanent} [vlan]

Syntax Description

mac_addr	One or more MAC addresses.
vlan	(Optional) Number of the VLAN; valid values are from 1 to 1000 and from 1025 to 4094.
dynamic	Clears the dynamic CAM entries from the CAM table.
static	Clears the static CAM entries from the CAM table.
permanent	Clears the permanent CAM entries from the CAM table.

Defaults

This command has no default settings.

Command Types

Switch command.

Command Modes

Privileged.

Examples

This example shows how to remove MAC address 00-40-0b-a0-03-fa from the CAM table:

Console> (enable) clear cam 00-40-0b-a0-03-fa

CAM table entry cleared.

Console> (enable)

This example shows how to clear dynamic entries from the CAM table:

Console> (enable) clear cam dynamic

Dynamic CAM entries cleared.

Console> (enable) 

Related Commands

set cam
show cam

clear cam notification

To clear the CAM notification counters and history log, use the clear cam notification command.

clear cam notification {all | counters | history}

Syntax Description

all	Clears the CAM notification counters and history log.
counters	Clears the CAM notification counters.
history	Clears the CAM notification history log.

Defaults

This command has no default settings.

Command Types

Switch command.

Command Modes

Privileged.

Examples

This example shows how to clear the CAM notification counters and history log:

Console> (enable) clear cam notification all

MAC address notification counters and history log cleared.

Console> (enable)

This example shows how to clear the CAM notification counters:

Console> (enable) clear cam notification counters

MAC address notification counters cleared.

Console> (enable)

This example shows how to clear the CAM notification history log:

Console> (enable) clear cam notification history

MAC address notification history log cleared.

Console> (enable)

Related Commands

set cam notification
set snmp trap
show cam notification

clear channel statistics

To clear PAgP statistical information, use the clear channel statistics command.

clear channel statistics

Syntax Description

This command has no arguments or keywords.

Defaults

This command has no default settings.

Command Types

Switch command.

Command Modes

Privileged.

Examples

This example shows how to clear PAgP statistical information:

Console> (enable) clear channel statistics

PAgP statistics cleared.

Console> (enable) 

Related Commands

show channel

clear config

To clear the system or module configuration information stored in NVRAM, use the clear config command.

clear config {mod | rmon | all | snmpv3 | acl nvram | interface}

Syntax Description

mod	Number of the module.
rmon	Clears all RMON configurations, including the historyControlTable, the alarmTable, the eventTable, and the ringStation ControlTable.
all	Clears all module and system configuration information, including the IP address.
snmpv3	Clears all SNMP version 3 configurations.
acl nvram	Clears all ACL configurations.
interface	Clears all interface configurations.

Defaults

This command has no default settings.

Command Types

Switch command.

Command Modes

Privileged.

Usage Guidelines

When you use a Multilayer Switch Module (MSM), you can enter the clear config command to clear the portion of the MSM configuration retained by the Catalyst 6500 series switch supervisor engine. You must clear the portion of the configuration kept by the MSM at the router level (router> prompt).

Before using the clear config all command, save a backup of the configuration using the copy command.

Examples

This example shows how to delete the configuration information in NVRAM on module 2:

Console> (enable) clear config 2

This command will clear module 2 configuration.

Do you want to continue (y/n) [n]? y

..............................

Module 2 configuration cleared.

Console> (enable)

This example shows how to delete the configuration information stored in NVRAM on module 1 (the supervisor engine):

Console> (enable) clear config 1

This command will clear module 1 configuration.

Do you want to continue (y/n) [n]? y

......

Module 1 configuration cleared.

host%

This example shows how to delete all the configuration information for the Catalyst 6500 series switches:

Console> (enable) clear config all

This command will clear all configuration in NVRAM.

Do you want to continue (y/n) [n]? y

...........................................

Connection closed by foreign host

host%

This example shows how to delete all the SNMP configuration information for the Catalyst 6500 series switches:

Console> (enable) clear config snmpv3

This command will clear SNMPv3 configuration in NVRAM.

Do you want to continue (y/n) [n]? y

...........................................

Connection closed by foreign host

host%

This example shows how to delete all ACL configuration information from NVRAM:

Console> (enable) clear config acl nvram

ACL configuration has been deleted from NVRAM.

Warning:Use the copy commands to save the ACL configuration to a file

and the 'set boot config-register auto-config' commands to configure the

auto-config feature.

Console> (enable) 

Related Commands

set config acl nvram
show config qos acl

clear config pvlan

To clear all private VLAN configurations in the system including port mappings, use the clear config pvlan command.

clear config pvlan

Syntax Description

This command has no arguments or keywords.

Defaults

This command has no default settings.

Command Types

Switch command.

Command Modes

Privileged.

Examples

This example shows how to clear all private VLAN configurations in the system:

Console> (enable) clear config pvlan

This command will clear all private VLAN configurations.

Do you want to continue (y/n) [n]? y

VLAN 15 deleted 
VLAN 16 deleted 
VLAN 17 deleted 
VLAN 18 deleted

Private VLAN configuration cleared. 
Console> (enable) 

Related Commands

clear pvlan mapping
clear vlan
configure
set vlan
set pvlan
set pvlan mapping
show config
show pvlan
show pvlan mapping
show vlan

clear cops

To clear Common Open Policy Service (COPS) configurations, use the clear cops command.

clear cops roles role1 [role2]...

clear cops all-roles

clear cops server all [diff-serv | rsvp]

clear cops server ipaddr [diff-serv | rsvp]

clear cops domain-name

Syntax Description

roles role#	Specifies the roles to clear.
all-roles	Clears all roles.
server	Specifies the COPS server.
all	Clears all server tables.
diff-serv	(Optional) Specifies the differentiated services server table.
rsvp	(Optional) Specifies the RSVP+ server table.
ipaddr	IP address or IP alias of the server.
domain-name	Specifies the domain name of the server.

Defaults

This command has no default settings.

Command Types

Switch command.

Command Modes

Privileged.

Usage Guidelines

You can use the clear cops all-roles command to clear all roles from all ports.

Examples

This example shows how to clear specific roles:

Console> (enable) clear cops roles backbone_port main_port

Roles cleared.

Console> (enable) 

This example shows how to clear all roles:

Console> (enable) clear cops all-roles

All roles cleared.

Console> (enable) 

This example shows how to clear all COPS servers:

Console> (enable) clear cops server all

All COPS servers cleared.

Console> (enable) 

This example shows how to clear a specific COPS server:

Console> (enable) clear cops server my_server1

All COPS servers cleared.

Console> (enable) 

This example shows how to clear the COPS domain name:

Console> (enable) clear cops domain-name

Domain name cleared.

Console> (enable) 

Related Commands

set cops
show cops

clear counters

To clear MAC counters, EtherChannel MAC counters, port counters, and the channel traffic percentile, use the clear counters command.

clear counters [all | mod/ports]

Syntax Description

all	(Optional) Specifies all ports.
mod/ports	(Optional) Number of the module and the ports on the module.

Defaults

This command has no default settings.

Command Types

Switch command.

Command Modes

Privileged.

Usage Guidelines

If you do not specify a range of ports to be cleared, then all ports on the switch are cleared.

Examples

This example shows how to reset MAC and port counters to zero:

Console> (enable) clear counters

This command will reset all MAC and port counters reported in CLI and SNMP.

Do you want to continue (y/n) [n]? y

MAC and Port counters cleared.

Console> (enable)

This example shows how to reset MAC and port counters to zero for a specific module and port:

Console> (enable) clear counters 5/1

This command will reset MAC and port counters reported by the CLI for port(s) 5/1.

Do you want to continue (y/n) [n]? y

MAC and Port counters cleared.

Console> (enable)

Related Commands

restore counters
show port counters

clear crypto key rsa

To remove all RSA public-key pairs, use the clear crypto key rsa command.

clear crypto key rsa

Syntax Description

This command has no keywords or arguments.

Defaults

This command has no default settings.

Command Types

Switch command.

Command Modes

Privileged.

Usage Guidelines

The crypto commands are supported on systems that run these image types only:

•supk9 image—for example, cat6000-supk9.6-1-3.bin

•supcvk9 image—for example, cat6000-supcvk9.6-1-3.bin

Examples

This example shows how to clear RSA key pairs:

Console> (enable) clear crypto key rsa 

Do you really want to clear RSA keys (y/n) [n]? y

RSA keys has been cleared.

Console> (enable) 

Related Commands

set crypto key rsa
show crypto key

clear dot1x config

To disable dot1x on all ports and return values to the default settings, use the clear dot1x config command.

clear dot1x config

Syntax Description

This command has no keywords or arguments.

Defaults

This command has no default settings.

Command Types

Switch command.

Command Modes

Privileged.

Examples

This example shows how to disable dot1x and return values to the default settings:

Console> (enable) clear dot1x config

This command will disable Dot1x and take values back to factory default.

Do you want to continue (y/n) [n]? y

Dot1x config cleared.

Console> (enable) 

Related Commands

set port dot1x
show dot1x
show port dot1x

clear dot1x guest-vlan

To remove any active 802.1x auto ports from the guest VLAN, use the clear dot1x guest-vlan command.

clear dot1x guest-vlan

Syntax Description

This command has no keywords or arguments.

Defaults

This command has no default settings.

Command Types

Switch command.

Command Modes

Privileged.

Examples

This example shows how to clear the guest VLAN:

Console> (enable) clear dot1x guest-vlan

This command will deactivate all the ports on dot1x guest-vlan

Do you wnat to continue (y/n) [n]? y

Dot1x guest-vlan cleared

Console> (enable)

Related Commands

set dot1x
set port dot1x
show dot1x
show port dot1x

clear gmrp statistics

To clear all the GMRP statistics information from a specified VLAN or all VLANs, use the clear gmrp statistics command.

clear gmrp statistics {vlan | all}

Syntax Description

vlan	Number of the VLAN; valid values are from 1 to 1000 and from 1025 to 4094.
all	Specifies all VLANs.

Defaults

This command has no default settings.

Command Types

Switch command.

Command Modes

Privileged.

Examples

This example shows how to clear GMRP statistical information from all VLANs:

Console> (enable) clear gmrp statistics all

GMRP statistics cleared.

Console> (enable) 

This example shows how to clear GMRP statistical information from VLAN 1:

Console> (enable) clear gmrp statistics 1

GMRP statistics cleared from VLAN 1.

Console> (enable) 

Related Commands

show gmrp statistics

clear gvrp statistics

To clear all the GVRP statistics information, use the clear gvrp statistics command.

clear gvrp statistics {mod/port | all}

Syntax Description

mod/port	Number of the module and port.
all	Specifies all ports.

Defaults

This command has no default settings.

Command Types

Switch command.

Command Modes

Privileged.

Examples

This example shows how to clear all GVRP statistical information:

Console> (enable) clear gvrp statistics all

GVRP statistics cleared for all ports.

Console> (enable) 

This example shows how to clear GVRP statistical information for module 2, port 1:

Console> (enable) clear gvrp statistics 2/1

GVRP statistics cleared on port 2/1.

Console> (enable) 

Related Commands

set gvrp
show gvrp configuration

clear igmp statistics

To clear IGMP snooping statistical information, use the clear igmp statistics command.

clear igmp statistics

Syntax Description

This command has no arguments or keywords.

Defaults

This command has no default settings.

Command Types

Switch command.

Command Modes

Privileged.

Examples

This example shows how to clear IGMP statistical information:

Console> (enable) clear igmp statistics

IGMP statistics cleared.

Console> (enable) 

Related Commands

set igmp
show igmp statistics

clear ip alias

To clear IP aliases that were set using the set ip alias command, use the clear ip alias command.

clear ip alias {name | all}

Syntax Description

name	IP address alias to delete.
all	Specifies that all previously set IP address aliases be deleted.

Defaults

This command has no default settings.

Command Types

Switch command.

Command Modes

Privileged.

Examples

This example shows how to delete a previously defined IP alias named babar:

Console> (enable) clear ip alias babar

IP alias deleted.

Console> (enable)

Related Commands

set ip alias
show ip alias

clear ip dns domain

To clear the default DNS domain name, use the clear ip dns domain command.

clear ip dns domain

Syntax Description

This command has no arguments or keywords.

Defaults

This command has no default settings.

Command Types

Switch command.

Command Modes

Privileged.

Examples

This example shows how to clear the default DNS domain name:

Console> (enable) clear ip dns domain

Default DNS domain name cleared.

Console> (enable)

Related Commands

set ip dns domain
show ip dns

clear ip dns server

To remove a DNS server from the DNS server listing, use the clear ip dns server command.

clear ip dns server {ip_addr | all}

Syntax Description

ip_addr	IP address of the DNS server you want to remove. An IP alias or a host name that can be resolved through DNS can also be used.
all	Specifies all the IP addresses in the DNS server listing to be removed.

Defaults

This command has no default settings.

Command Types

Switch command.

Command Modes

Privileged.

Examples

This example shows how to remove the DNS server at IP address 198.92.30.32 from the DNS server listing:

Console> (enable) clear ip dns server 198.92.30.32

198.92.30.32 cleared from DNS table.

Console> (enable)

This example shows how to remove all DNS servers from the DNS server listing:

Console> (enable) clear ip dns server all

All DNS servers cleared 

Console> (enable)

Related Commands

set ip dns server
show ip dns

clear ip permit

To remove a specified IP address and mask or all IP addresses and masks from the permit list, use the clear ip permit command.

clear ip permit all

clear ip permit {ip_addr} [mask] [telnet | ssh | snmp | all]

Syntax Description

ip_addr	IP address to be cleared. An IP alias or a host name that can be resolved through DNS can also be used.
mask	(Optional) Subnet mask of the specified IP address.
telnet	(Optional) Clears the entries in the Telnet permit list.
ssh	(Optional) Clears the entries in the SSH permit list.
snmp	(Optional) Clears the entries in the SNMP permit list.
all	(Optional) Clears all permit lists.

Defaults

This command has no default settings.

Command Types

Switch command.

Command Modes

Privileged.

Usage Guidelines

The clear ip permit all command clears the permit list but does not change the state of the IP permit feature. A warning is displayed if all IP addresses are cleared from the permit list, and the feature is enabled. If a mask other than the default (255.255.255.255) has been configured, you must provide both the address and mask to clear a specific entry.

If the telnet, ssh, snmp, or all keyword is not specified, the IP address is removed from both the SNMP and Telnet permit lists.

Examples

These examples show how to remove IP addresses:

Console> (enable) clear ip permit 172.100.101.102

172.100.101.102 cleared from IP permit list.

Console> (enable)

Console> (enable) clear ip permit 172.160.161.0 255.255.192.0 snmp

172.160.128.0 with mask 255.255.192.0 cleared from snmp permit list.

Console> (enable)

Console> (enable) clear ip permit 172.100.101.102 telnet

172.100.101.102 cleared from telnet permit list.

Console> (enable)

Console> (enable) clear ip permit all

IP permit list cleared.

WARNING

IP permit list is still enabled.

Console> (enable)

Related Commands

set ip permit
show ip permit

clear ip route

To delete IP routing table entries, use the clear ip route command.

clear ip route destination gateway

Syntax Description

destination	IP address of the host or network. An IP alias or a host name that can be resolved through DNS can also be used.
gateway	IP address or alias of the gateway router.

Defaults

The default is destination. If the destination is not the active default gateway, the actual destination is the default.

Command Types

Switch command.

Command Modes

Privileged.

Examples

This example shows how to delete the routing table entries using the clear ip route command:

Console> (enable) clear ip route 134.12.3.0 elvis

Route deleted.

Console> (enable)

Related Commands

set ip route
show ip route

clear kerberos clients mandatory

To disable mandatory Kerberos authentication for services on the network, use the clear kerberos clients mandatory command.

clear kerberos clients mandatory

Syntax Description

This command has no arguments or keywords.

Defaults

Kerberos clients are not set to mandatory.

Command Types

Switch command.

Command Modes

Privileged.

Usage Guidelines

If you do not make Kerberos authentication mandatory and Kerberos authentication fails, the application attempts to authenticate users using the default method of authentication for that network service. For example, Telnet prompts for a password.

Examples

This example shows how to clear mandatory Kerberos authentication:

Console> (enable) clear kerberos clients mandatory 

Kerberos clients mandatory cleared

Console> (enable)

Related Commands

set kerberos clients mandatory
show kerberos

clear kerberos credentials forward

To disable credentials forwarding, use the clear kerberos credentials forward command.

clear kerberos credentials forward

Syntax Description

This command has no arguments or keywords.

Defaults

The default is forwarding is disabled.

Command Types

Switch command.

Command Modes

Privileged.

Usage Guidelines

If you have a ticket granting ticket (TGT) and are authenticated to a Kerberized switch, you can use the TGT to authenticate to a host on the network. If forwarding is not enabled and you try to list credentials after authenticating to a host, the output will show no Kerberos credentials are present.

Examples

This example shows how to disable Kerberos credentials forwarding:

Console> (enable) clear kerberos credentials forward 

Kerberos credentials forwarding disabled

Console> (enable) 

Related Commands

set kerberos clients mandatory
set kerberos credentials forward
show kerberos

clear kerberos creds

To delete all the Kerberos credentials, use the clear kerberos creds command.

clear kerberos creds

Syntax Description

This command has no arguments or keywords.

Defaults

The command has no default settings.

Command Types

Switch command.

Command Modes

Privileged.

Usage Guidelines

If you have a TGT and are authenticated to a Kerberized switch, you can use the TGT to authenticate to a host on the network.

Examples

This example shows how to delete all Kerberos credentials:

Console> (enable) clear kerberos creds

Console> (enable) 

Related Commands

set kerberos credentials forward
show kerberos

clear kerberos realm

To clear an entry that maps the name of a Kerberos realm to a DNS domain name or a host name, use the clear kerberos realm command.

clear kerberos realm {dns_domain | host} kerberos_realm

Syntax Description

dns_domain	DNS domain name to map to a Kerberos realm.
host	IP address or name to map to a Kerberos realm.
kerberos_realm	IP address or name of a Kerberos realm.

Defaults

This command has no default settings.

Command Types

Switch command.

Command Modes

Privileged.

Usage Guidelines

You can map the name of a Kerberos realm to a DNS domain name or a host name with the set kerberos realm command.

Examples

This example shows how to clear an entry mapping a Kerberos realm to a domain name:

Console> (enable) clear kerberos realm CISCO CISCO.COM

Kerberos DnsDomain-Realm entry CISCO - CISCO.COM deleted

Console> (enable) 

Related Commands

set kerberos local-realm
set kerberos realm
show kerberos

clear kerberos server

To clear a specified Key Distribution Center (KDC) entry, use the clear kerberos server command.

clear kerberos server kerberos_realm {hostname | ip_address} [port_number]

Syntax Description

kerberos_realm	Name of a Kerberos realm.
hostname	Name of the host running the KDC.
ip_address	IP address of the host running the KDC.
port_number	(Optional) Number of the port on the module.

Defaults

This command has no default settings.

Command Types

Switch command.

Command Modes

Privileged.

Usage Guidelines

You can specify to the switch which KDC to use in a Kerberos realm. This command clears a server entry from the table.

Examples

This example shows how to clear a KDC server entered on the switch:

Console> (enable) clear kerberos server CISCO.COM 187.0.2.1 750

Kerberos Realm-Server-Port entry CISCO.COM-187.0.2.1-750  deleted

Console> (enable) 

Related Commands

set kerberos server
show kerberos

clear key config-key

To remove a private 3DES key, use the clear key config-key command.

clear key config-key string

Syntax Description

string

Name of the 3DES key; the name should be no longer than 8 bytes.

Defaults

This command has no default settings.

Command Types

Switch command.

Command Modes

Privileged.

Examples

This example shows how to remove a private 3DES key:

Console> (enable)  clear key config-key abcd

Kerberos config key deleted

Console> (enable) 

Related Commands

set key config-key

clear l2protocol-tunnel cos

To clear the Layer 2 protocol tunneling CoS value for all ingress tunneling ports, use the clear l2protocol-tunnel cos command.

clear l2protocol-tunnel cos

Syntax Description

This command has no arguments or keywords.

Defaults

The CoS value is restored to 5.

Command Types

Switch command.

Command Modes

Privileged.

Examples

This example shows how to clear the Layer 2 protocol tunneling CoS value:

Console> (enable) clear l2protocol-tunnel cos

Default Cos set to 5.

Console> (enable)

Related Commands

clear l2protocol-tunnel statistics
set l2protocol-tunnel cos
set port l2protocol-tunnel
show l2protocol-tunnel statistics
show port l2protocol-tunnel

clear l2protocol-tunnel statistics

To clear Layer 2 protocol tunneling statistics on a port or on all tunneling ports, use the clear l2protocol-tunnel statistics command.

clear l2protocol-tunnel statistics [mod/port]

Syntax Description

mod/port

(Optional) Number of the module and port on the module. See the "Usage Guidelines" section for more information.

Defaults

This command has no default settings.

Command Types

Switch command.

Command Modes

Privileged.

Usage Guidelines

If you do not specify a module and port number, the Layer 2 protocol tunneling statistics for all tunneling ports and all VLANs are cleared.

Examples

This example shows how to clear the Layer 2 protocol tunneling statistics for a single port:

Console> (enable) clear l2protocol-tunnel statistics 7/1  

Layer 2 Protocol Tunneling statistics cleared on port 7/1.

Console> (enable)

Related Commands

clear l2protocol-tunnel cos
set l2protocol-tunnel cos
set port l2protocol-tunnel
show l2protocol-tunnel statistics
show port l2protocol-tunnel

clear lacp-channel statistics

To clear Link Aggregation Control Protocol (LACP) statistical information, use the clear lacp-channel statistics command.

clear lacp-channel statistics

Syntax Description

This command has no keywords or arguments.

Defaults

This command has no default settings.

Command Types

Switch command.

Command Modes

Normal.

Usage Guidelines

For differences between PAgP and LACP, refer to the "Guidelines for Port Configuration" section of the "Configuring EtherChannel" chapter of the Catalyst 6500 Series Switch Software Configuration Guide.

Examples

This example shows how to clear LACP statistical information:

Console> (enable) clear lacp-channel statistics

LACP channel counters are cleared.

Console> (enable)

Related Commands

set channelprotocol
set lacp-channel system-priority
set port lacp-channel
set spantree channelcost
set spantree channelvlancost
show lacp-channel
show port lacp-channel

clear lda

To remove the accelerated server load balancing (ASLB) MLS entries or MAC addresses from the switch, use the clear lda command.

clear lda mls

clear lda mls [destination ip_addr_spec] [source ip_addr_spec] [protocol protocol
src-port src_port dst-port dst_port]

clear lda vip {all | vip | vip tcp_port}

clear lda mac {all | router_mac_address}

Syntax Description

mls	Removes an LDA MLS entry.
destination ip_addr_spec	(Optional) Full destination IP address or a subnet address in these formats: ip_addr, ip_addr/netmask, or ip_addr/maskbit.
source ip_addr_spec	(Optional) Full source IP address or a subnet address in these formats: ip_addr, ip_addr/netmask, or ip_addr/maskbit.
protocol protocol	(Optional) Specifies additional flow information (protocol family and protocol port pair) to be matched; valid values include tcp, udp, icmp, or a decimal number for other protocol families.
src-port src_port	(Optional) Specifies the number of the TCP/UDP source port (decimal). Used with dst-port to specify the port pair if the protocol is tcp or udp. 0 indicates "do not care."
dst-port dst_port	(Optional) Specifies the number of the TCP/UDP destination port (decimal). Used with src-port to specify the port pair if the protocol is tcp or udp. 0 indicates "do not care."
vip all	Removes all VIP couples (set using the set lda command).
vip vip	Specifies a VIP.
vip vip tcp_port	Specifies a VIP and port couple.
mac all	Clears all ASLB router MAC addresses.
mac router_mac_ address	Clears a specific router MAC address.

Defaults

This command has no default settings.

Command Types

Switch command.

Command Modes

Privileged.

Usage Guidelines

This command is supported only on switches configured with the Supervisor Engine 1 with Layer 3 Switching Engine WS-F6K-PFC (Policy Feature Card).

Entering the destination keyword specifies the entries matching the destination IP address specification, entering the source keyword specifies the entries matching the source IP address specification, and entering an ip_addr_spec can specify a full IP address or a subnet address. If you do not specify a keyword, it is treated as a wildcard, and all entries are displayed.

When entering the ip_addr_spec, use the full IP address or a subnet address in one of the following formats: ip_addr, ip_addr/netmask, or ip_addr/maskbit.

If you do not enter any keywords, the LD is removed from the switch and the LD configuration is removed from NVRAM.

If you do not enter any keywords with the clear lda mls command, all ASLB MLS entries are cleared.

Examples

This example shows how to clear the ASLB MLS entry at a specific destination address:

Console> (enable) clear lda mls destination 172.20.26.22

MLS IP entry cleared.

Console> (enable)

This example shows how to delete a VIP and port pair (VIP 10.0.0.8, port 8):

Console> (enable) clear lda vip 10.0.0.8 8

Successfully deleted vip/port pairs.

Console> (enable)

This example shows how to clear all ASLB router MAC addresses:

Console> (enable) clear lda mac all

Successfully cleared Router MAC address.

Console> (enable)

This example shows how to clear a specific ASLB router MAC address:

Console> (enable) clear lda mac 1-2-3-4-5-6

Successfully cleared Router MAC address.

Console> (enable)

Related Commands

commit lda
set lda
show lda

clear localuser

To delete a local user account from the switch, use the clear localuser command.

clear localuser name

Syntax Description

name	Specifies the local user account.

Defaults

This command has no default settings.

Command Types

Switch command.

Command Modes

Privileged.

Examples

This example shows how to delete a local user account:

Console> (enable) clear localuser troy

Local user cleared.

Console> (enable)

Related Commands

set localuser
show localuser

clear log

To delete module, system error log, or dump log entries, use the clear log command.

clear log [mod]

clear log dump

Syntax Description

mod	(Optional) Module number.
dump	Clears dump log entries.

Defaults

This command has no default settings.

Command Types

Switch command.

Command Modes

Privileged.

Usage Guidelines

If you do not specify a module number, the system error log for the entire system is erased.

Examples

This example shows how to clear the system error log:

Console> (enable) clear log

System error log cleared.

Console> (enable) 

This example shows how to clear the dump log:

Console> (enable) clear log dump

Console> (enable) 

Related Commands

show log

clear log command

To clear the command log entry table, use the clear log command command.

clear log command [mod]

Syntax Description

mod	(Optional) Number of the module.

Defaults

This command has no default settings.

Command Types

Switch command.

Command Modes

Privileged.

Usage Guidelines

The command log entry table is a history log of the commands sent to the switch from the console or Telnet.

Examples

This example shows how to clear the command log table for the switch:

Console> (enable) clear log command

Local-log cleared

Console> (enable) 

This example shows how to clear the command log table for a specific module:

Console> (enable) clear log command 3

Module 3 log cleared.

Console> (enable) 

Related Commands

show log command

clear logging buffer

To clear the system logging buffer, use the clear logging buffer command.

clear logging buffer

Syntax Description

This command has no arguments or keywords.

Defaults

This command has no default settings.

Command Types

Switch command.

Command Modes

Privileged.

Examples

This example shows how to clear the system logging buffer:

Console> (enable) clear logging buffer

System logging buffer cleared.

Console> (enable)

Related Commands

show logging buffer

clear logging level

To reset the logging level for a facility or for all facilities to their default settings, use the clear logging level command.

clear logging level {facility | all}

Syntax Description

facility	Name of the facility to reset; facility types are listed in Table 2-1.
all	Resets all facilities.

Table 2-1 Facility Types 

Facility Name	Definition
all	All facilities
acl	access control list
cdp	Cisco Discovery Protocol
cops	Common Open Policy Service Protocol
dtp	Dynamic Trunking Protocol
dvlan	Dynamic VLAN
earl	Enhanced Address Recognition Logic
filesys	file system facility
gvrp	GARP VLAN Registration Protocol
ip	Internet Protocol
kernel	Kernel
ld	ASLB facility
mcast	Multicast
mgmt	Management
mls	Multilayer Switching
pagp	Port Aggregation Protocol
protfilt	Protocol Filter
pruning	VTP pruning
privatevlan	Private VLAN facility
qos	Quality of Service
radius	Remote Access Dial-In User Service
rsvp	ReSerVation Protocol
security	Security
snmp	Simple Network Management Protocol
spantree	Spanning Tree Protocol
sys	System
tac	Terminal Access Controller
tcp	Transmission Control Protocol
telnet	Terminal Emulation Protocol
tftp	Trivial File Transfer Protocol
udld	User Datagram Protocol
vmps	VLAN Membership Policy Server
vtp	Virtual Terminal Protocol

Defaults

This command has no default settings.

Command Types

Switch command.

Command Modes

Privileged.

Examples

This example shows how to reset a specific facility back to its default settings:

Console> (enable) clear logging level dtp

Current session and default severities of facility <dtp> set to factory default values.

Console> (enable)

This example shows how to reset all facilities back to their default settings:

Console> (enable) clear logging level all

Current session and default severities of all facilities set to factory default values.

Console> (enable)

Related Commands

set logging level
show logging

clear logging server

To delete a syslog server from the system log server table, use the clear logging server command.

clear logging server ip_addr

Syntax Description

ip_addr

IP address of the syslog server to be deleted.

Defaults

This command has no default settings.

Command Types

Switch command.

Command Modes

Privileged.

Examples

This example shows how to delete a syslog server from the configuration:

Console> (enable) clear logging server 171.69.192.207 
System log server 171.69.192.207 removed from system log server table.

Console> (enable) 

Related Commands

set logging server
show logging

clear mls cef

To clear CEF summary statistics, use the clear mls cef command.

clear mls cef

Syntax Description

This command has no arguments or keywords.

Defaults

This command has no default settings.

Command Types

Switch command.

Command Modes

Privileged.

Usage Guidelines

This command is supported on Catalyst 6500 series switches configured with the Supervisor Engine 2 with Layer 3 Switching Engine II (PFC2) only.

Examples

This example shows how to clear CEF summary information:

Console> (enable) clear mls cef 

CEF statistics cleared.

Console> (enable)

Related Commands

show mls cef summary

clear mls entry

To clear MLS entries in the Catalyst 6500 series switches, use the clear mls entry command.

clear mls entry [ip | ipx] all

clear mls entry ip destination ip_addr_spec [source ip_addr_spec] [protocol protocol] [src-port src_port] [dst-port dst_port]

clear mls entry ipx destination ipx_addr_spec

Syntax Description

ip	(Optional) Specifies IP MLS.
ipx	(Optional) Specifies IPX MLS.
all	Clears all MLS entries.
destination	Specifies the destination IP address.
ip_addr_spec	Full IP address or a subnet address in these formats: ip_addr, ip_addr/netmask, or ip_addr/maskbit.
source ip_addr_spec	(Optional) Specifies the source IP address.
protocol protocol	(Optional) Specifies additional flow information (protocol family and protocol port pair) to be matched; valid values are 0 to 255 or ip, ipinip, icmp, igmp, tcp, and udp.
src-port src_port	(Optional) Specifies the source port IP address; valid values are 1 to 65535, dns, ftp, smtp, telnet, x (X-Windows), www.
dst-port dst_port	(Optional) Specifies the destination port IP address; valid values are 1 to 65535, dns, ftp, smtp, telnet, x (X-Windows), www.
ipx_addr_spec	Full IPX address or a subnet address in these formats: src_net/[mask], dest_net.dest_node, or dest_net/mask.

Defaults

This command has no default settings.

Command Types

Switch command.

Command Modes

Privileged.

Usage Guidelines

This command is not supported on systems configured with the Supervisor Engine 2 with Layer 3 Switching Engine II (PFC2). To clear entries on systems configured with the Supervisor Engine 2 with Layer 3 Switching Engine II (PFC2), you must enter the clear mls entry cef adjacency command.

When entering the IPX address syntax, use the following format:

•IPX net address—1..FFFFFFFE

•IPX node address—x.x.x where x is 0..FFFF

•IPX address—ipx_net.ipx_node (for example 3.0034.1245.AB45, A43.0000.0000.0001)

Up to 16 routers can be included explicitly as MLS-RPs.

To use a router as an MLS, you must meet these conditions:

•The router must be included (either explicitly or automatically) in the MLS-SE.

•The MLS feature must be enabled in the Catalyst 6500 series switches.

•The Catalyst 6500 series switches must know the router's MAC-VLAN pairs.

Use the following syntax to specify an IP subnet address:

•ip_subnet_addr—This is the short subnet address format. The trailing decimal number 00 in an IP address YY.YY.YY.00 specifies the boundary for an IP subnet address. For example, 172.22.36.00 indicates a 24-bit subnet address (subnet mask 172.22.36.00/255.255.255.0), and 173.24.00.00 indicates a 16-bit subnet address (subnet mask 173.24.00.00/255.255.0.0). However, this format can identify only a subnet address of 8, 16, or 24 bits.

•ip_addr/subnet_mask—This is the long subnet address format. For example, 172.22.252.00/255.255.252.00 indicates a 22-bit subnet address. This format can specify a subnet address of any bit number. To provide more flexibility, the ip_addr is a full host address, such as 172.22.253.1/255.255.252.00.

•ip_addr/maskbits—This is the simplified long subnet address format. The mask bits specify the number of bits of the network masks. For example, 172.22.252.00/22 indicates a 22-bit subnet address. The ip_addr is a full host address, such as 193.22.253.1/22, which has the same subnet address as the ip_subnet_addr.

If you do not use the all argument in the clear mls entry command, you must specify at least one of the other three keywords (source, destination, or protocol) and its arguments.

If no value or 0 is entered for src_port and dest_port, all entries are cleared.

When you remove a Multilayer Switch Module (MSM) from the Catalyst 6500 series switch, it is removed immediately from the inclusion list and all the MLS entries for the MSM are removed.

Examples

This example shows how to clear the MLS entries with destination IP address 172.20.26.22:

Console> (enable) clear mls entry destination 172.20.26.22 

Multilayer switching entry cleared.

Console> (enable)

This example shows how to clear specific IP MLS entries for destination IP address 172.20.26.22:

Console> (enable) clear mls entry ip destination 172.20.26.22 source 172.20.22.113 protocol tcp 520 320

Multilayer switching entry cleared

Console> (enable)

This example shows how to clear specific IPX MLS entries for a destination IPX address:

Console> (enable) clear mls entry ipx destination 1.00e0.fefc.6000 source 3.0034.1245.AB45 

IPX Multilayer switching entry cleared

Console> (enable)

Related Commands

show mls entry

clear mls entry cef adjacency

To clear CEF adjacency statistics, use the clear mls entry cef adjacency command.

clear mls entry cef adjacency

clear mls entry cef ip [[ip_addr/]mask_len] adjacency

clear mls entry cef ipx [[ipx_addr/]mask_len] adjacency

Syntax Description

ip	Specifies IP entries.
ipx	Specifies IPX entries.
ip_addr	(Optional) IP address of the entry.
mask_len	(Optional) Mask length associated with the IP or IPX address of the entry; valid values are from 0 to 32.
ipx_addr	(Optional) IPX address of the entry.

Defaults

This command has no default settings.

Command Types

Switch command.

Command Modes

Privileged.

Usage Guidelines

This command is supported on Catalyst 6500 series switches configured with the Supervisor Engine 2 with Layer 3 Switching Engine II (PFC2).

To clear MLS entries on systems configured with the Supervisor Engine 1 with Layer 3 Switching Engine WS-F6K-PFC (Policy Feature Card), enter the clear mls entry command.

The ipx_addr value is entered as 32-bit hexadecimal digits.

Examples

This example shows how to clear all adjacencies associated with CEF entries:

Console> (enable) clear mls cef entry adjacency

Adjacency statistics has been cleared.

Console> (enable) 

Related Commands

show mls entry cef

clear mls exclude protocol

To remove a protocol port that has been excluded from shortcutting using the set mls exclude protocol command, use the clear mls exclude protocol command.

clear mls exclude protocol tcp | udp | both port

Syntax Description

tcp	Specifies a TCP port.
udp	Specifies a UDP port.
both	Specifies that the port be applied to both TCP and UDP traffic.
port	Number of the port.

Defaults

This command has no default settings.

Command Types

Switch command.

Command Modes

Privileged.

Examples

This example shows how to set TCP packets in a protocol port to be hardware switched:

Console> (enable) clear mls exclude protocol tcp 25

TCP packets with protocol port 25 will be MLS switched.

Console> (enable)

Related Commands

set mls exclude protocol
show mls exclude protocol