Table of Contents

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cd

Use the cd command to set the default Flash device for the system.

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.

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

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 alias

Use the clear alias command to clear the shorthand versions of commands.

Console> (enable) clear alias arpdel
Command alias deleted.
Console> (enable)
 

Console> (enable) clear alias all
Command alias table cleared. (1)
Console> (enable)
 

set alias
show alias

clear arp

Use the clear arp command to delete a specific entry or all entries from the ARP table.

Syntax Description

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

Defaults

This command has no default setting.

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

Use the clear banner motd command to clear the message-of-the-day banner.

Syntax Description

This command has no arguments or keywords.

Defaults

This command has no default setting.

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

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

Console> (enable) clear boot auto-config
CONFIG_FILE variable =
Console> (enable)

set boot auto-config
show boot

clear boot device

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

Syntax Description

mod	Number of the module containing the Flash device.

Defaults

This command has no default setting.

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

Use the clear boot system command set to clear the contents of the BOOT environment variable and the configuration register setting.

Syntax Description

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

Defaults

This command has no default setting.

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:

Console> (enable) clear boot system flash bootflash:cat6000-sup.5-5-1.bin
BOOT variable = bootflash:cat6000-sup.5-2-1.bin,1;bootflash:cat6000-sup.4-5-2.
bin,1;
Console> (enable)

Related Commands

set boot system flash
show boot

clear cam

Use the clear cam command to delete a specific entry or all entries from the CAM table.

Syntax Description

mac_addr	One or more MAC addresses.
dynamic	Keyword to clear the dynamic CAM entries from the CAM table.
static	Keyword to clear the static CAM entries from the CAM table.
permanent	Keyword to clear the permanent CAM entries from the CAM table.
vlan	(Optional) Number of the VLAN; valid values are 1 to 1005.

Defaults

This command has no default setting.

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 channel statistics

Use the clear channel statistics command to clear PAgP statistical information.

Console> (enable) clear channel statistics
PAgP statistics cleared.
Console> (enable) 

show channel

clear config

Use the clear config command to clear the system or module configuration information stored in NVRAM.

Syntax Description

mod	Number of the module.
rmon	Keyword to clear all RMON configurations, including the historyControlTable, the alarmTable, the eventTable, and the ringStation ControlTable.
all	Keyword to clear all module and system configuration information, including the IP address.
snmp	Keyword to clear all SNMP configurations.
acl nvram	Keywords to clear all ACL configurations.

Defaults

This command has no default setting.

Command Types

Switch command.

Command Modes

Privileged.

Usage Guidelines

When using an MSM, clear config clears the portion of the MSM configuration kept by the Catalyst 6000 series switch supervisor engine. The portion of the configuration kept by the MSM must be cleared 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 6000 family 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 6000 family switches:

Console> (enable) clear config snmp
This command will clear SNMP 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

configure
show config

clear config pvlan

Use the clear config pvlan command to clear all private VLAN configurations in the system including port mappings.

Syntax Description

This command has no arguments or keywords.

Defaults

This command has no default setting.

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

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

clear cops

Use the clear cops command to clear COPS configurations.

Syntax Description

roles role#	Keyword and variable to specify the roles to clear.
all-roles	Keyword to clear all roles.
server	Keyword to specify the COPS server.
all	Keyword to clear all servers.
ipaddress	Keyword and variable to specify the IP address or IP alias of the server.
primary	(Optional) Keyword to specify the primary server.
diff-serv	(Optional) Keyword to specify the differentiated services server table.
rsvp	(Optional) Keyword to specify the RSVP+ server table.
domain-name	Domain name of the server.

Defaults

This command has no default setting.

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

show cops
set cops

clear counters

Use the clear counters command to clear MAC and port counters.

Syntax Description

This command has no keywords or arguments.

Defaults

This command has no default setting.

Command Types

Switch command.

Command Modes

Privileged.

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)

Related Commands

show port counters

clear gmrp statistics

Use the clear gmrp statistics command to clear all the GMRP statistics information from a specified VLAN or all VLANs.

Console> (enable) clear gmrp statistics
GMRP statistics cleared.
Console> (enable) 
 

Console> (enable) clear gmrp statistics 1
GMRP statistics cleared from VLAN 1.
Console> (enable) 

show gmrp statistics

clear gvrp statistics

Use the clear gvrp statistics command to clear all the GVRP statistics information.

Console> (enable) clear gvrp statistics all
GVRP statistics cleared for all ports.
Console> (enable) 
 

Console> (enable) clear gvrp statistics 2/1
GVRP statistics cleared on port 2/1.
Console> (enable) 

show gvrp configuration
set gvrp

clear igmp statistics

Use the clear igmp statistics command to clear IGMP snooping statistical information.

Console> (enable) clear igmp statistics
IGMP statistics cleared.
Console> (enable) 

set igmp
show igmp statistics

clear ip alias

Use the clear ip alias command to clear IP aliases set using the set ip alias command.

Console> (enable) clear ip alias babar
IP alias deleted.
Console> (enable)

set ip alias
show ip alias

clear ip dns domain

Use the clear ip dns domain command to clear the default DNS domain name.

Console> (enable) clear ip dns domain
Default DNS domain name cleared.
Console> (enable)

set ip dns domain
show ip dns

clear ip dns server

Use the clear ip dns server command to remove a DNS server 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)
 

Console> (enable) clear ip dns server all
All DNS servers cleared 
Console> (enable)

set ip dns server
show ip dns

clear ip permit

Use the clear ip permit command to remove a specified IP address and mask or all IP addresses and masks from the permit list.

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)

set ip permit
show ip permit
show port counters

clear ip route

Use the clear ip route command to delete IP routing table entries.

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 route 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

Use the clear kerberos clients mandatory command to disable mandatory Kerberos authentication for services on the network.

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

Use the clear kerberos credentials forward command to disable credentials forwarding.

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 TGT and are authenticated to a Kerberized switch, you can use the TGT to authenticate to a host on the network. However, if forwarding is not enabled and you try to list credentials after authenticating to a host, the output will show no Kerberos credentials 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 credentials forward
set kerberos clients mandatory
show kerberos creds

clear kerberos creds

Use the clear kerberos creds command to delete all the Kerberos credentials.

Syntax Description

This command has no arguments or keywords.

Defaults

The command has no default setting.

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

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

Syntax Description

dns_domain	DNS domain name.
host	Host name.
kerberos-realm	IP address or name of Kerberos realm.

Defaults

This command has no default setting.

Command Types

Switch command.

Command Modes

Privileged.

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 realm
set kerberos local-realm
show kerberos

clear kerberos server

Use the clear kerberos server command to clear a specified KDC entry.

Syntax Description

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

Defaults

This command has no default setting.

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

Use the clear key config-key command to remove a private DES key.

Syntax Description

string

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

Defaults

This command has no default setting.

Command Types

Switch command.

Command Modes

Privileged.

Examples

This example shows how to remove a private DES key:

kerberos> (enable)  clear key config-key abcd
Kerberos config key deleted
kerberos> (enable) 

Related Commands

set key config-key

clear lda

Use the clear lda command set to remove the ASLB MLS entries or MAC addresses from the switch.

Syntax Description

mls	Keyword to remove configured LDs.
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) Keyword and variable to specify 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) Keyword and variable to specify 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) Keyword and variable to specify 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	Keywords to remove all VIP couples (set using the set lda command).
vip vip	Keyword and variable to specify a VIP.
vip vip tcp_port	Keyword and variables to specify a VIP and port couple.
mac all	Keywords to clear all ASLB router MAC addresses.
mac router_mac_ address	Keyword and variable to clear a specific router MAC address.

Defaults

This command has no default setting.

Command Types

Switch command.

Command Modes

Privileged.

Usage Guidelines

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
show lda
set lda

clear log

Use the clear log command set to delete module, system error log, or dump log entries.

Console> (enable) clear log
System error log cleared.
Console> (enable) 
 

Console> (enable) clear log dump
Console> (enable) 

show log

clear logging buffer

Use the clear logging buffer command to clear the system logging buffer.

Console> (enable) clear logging buffer
System logging buffer cleared.
Console> (enable)

show logging buffer

Posted: Wed Aug 23 13:23:34 PDT 2000
Copyright 1989-2000©Cisco Systems Inc.