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This chapter describes the clear commands used in the Catalyst 5000 series switch command-line interface (CLI). For a summary of the available switch CLI commands, refer to the "Switch Command Quick Reference" chapter. For more information about using the switch CLI, refer to the "Switch Command-Line Interface" chapter.
Other commands are described elsewhere in this publication:
Switch CLI:
ATM module CLI:
Use the clear alias privileged command to clear the shorthand versions of commands.
clear alias {name | all}| name | Identifies the alternate identifier of the command. |
| all | Identifies every alternate identifier previously created. |
This command has no default setting.
Switch command.
Privileged.
The following example shows how to erase the alias called arpdel:
Console> (enable)clear alias arpdelCommand alias deleted. Console> (enable)clear alias allCommand alias table cleared. (1) Console> (enable)
The (1) indicates the number of command aliases cleared.
Use the clear arp privileged command to delete a specific entry or all entries from the Address Resolution Protocol (ARP) table.
clear arp {ip_address | all}| ip_address | Specific IP address in the ARP table to be cleared. An IP alias or host name that can be resolved through the Domain Name System (DNS) can be specified instead of an IP address. |
| all | Keyword that specifies every IP address in the ARP table. |
This command has no default setting.
Switch command.
Privileged.
The following example shows how to remove IP address 198.133.219.209 from the ARP table and how to remove all entries from the ARP table:
Console> (enable)clear arp 198.133.219.209ARP entry deleted. Console> (enable)clear arp allARP table cleared. (1) Console> (enable)
The (1) indicates the number of entries cleared.
Use the clear banner motd privileged command to clear the message of the day banner.
clear banner motdThis command has no arguments or keywords.
This command has no default setting.
Switch command.
Privileged.
The following example shows how to clear the message of the day banner:
Console> (enable) clear banner motd
MOTD banner cleared
Console> (enable)
Use the clear cam privileged command to delete a specific entry or all entries from the Media Access Control (MAC) Address Resolution Protocol (ARP) table (called the content-addressable memory [CAM] table in this command).
clear cam {mac_addr | dynamic | static | permanent} [vlan]| mac_addr | Identifies one or more MAC addresses. |
| 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. |
| vlan | Identifies the number of the VLAN. |
This command has no default setting.
Switch command.
Privileged.
The following 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.
The following example shows how to clear dynamic entries from the CAM table:
Console> (enable) clear cam dynamic
Dynamic CAM entries cleared.
Console> (enable)
Use the clear cgmp statistics privileged command to clear Cisco Group Management Protocol (CGMP) statistical information.
clear cgmp statisticsThis command has no arguments or keywords.
This command has no default setting.
Switch command.
Privileged.
The following example shows how to clear CGMP statistical information:
Console> (enable) clear cgmp statistics
CGMP statistics cleared.
Console> (enable)
Use the clear config privileged command to clear the system or module configuration information stored in nonvolatile RAM (NVRAM).
clear config {mod_num | rmon | all}| mod_num | Number of the module. |
| rmon | Keyword that clears all RMON configurations, including the historyControlTable, the alarmTable, the eventTable, and the ringStation ControlTable. |
| all | Keyword that specifies all modules and system information, including the IP address. |
This command has no default setting.
Switch command.
Privileged.
When using a Route Switch Module (RSM), clear config clears the portion of the RSM configuration kept by the Catalyst 5000 series switch supervisor engine. The portion of the configuration kept by the RSM must be cleared at the router level (router> prompt).
The following example shows how to delete the configuration information stored in NVRAM on module 2:
Console> (enable)clear config 2This command will clear module 2 configuration. Do you want to continue (y/n) [n]?y.............................. Module 2 configuration cleared. Console> (enable)
The following example shows how to delete the configuration information stored in NVRAM on module 1 (the supervisor module):
Console> (enable)clear config 1This command will clear module 1 configuration. Do you want to continue (y/n) [n]?y...... Module 1 configuration cleared. host%
The following example shows how to delete the configuration information for the entire Catalyst 5000 series switch:
Console> (enable)clear config allThis command will clear all configuration in NVRAM. Do you want to continue (y/n) [n]?y........................................... Connection closed by foreign host host%
Use the clear counters privileged command to clear MAC and port counters.
clear countersThis command has no keywords or arguments.
This command has no default setting.
Switch command.
Privileged.
This command does not clear counters for the ATM module.
The following example shows how to reset MAC and port counters to zero:
Console> (enable) clear counters
MAC and Port counters cleared.
Console> (enable)
Use the clear help privileged command to list the clear commands with brief descriptions of their functions.
clear helpThis command has no arguments or keywords.
This command has no default setting.
Switch command.
Privileged.
The following example shows how to list all of the clear commands in privileged command mode:
Console> (enable) clear help
Clear commands:
----------------------------------------------------------------------
clear alias Clear aliases of commands
clear arp Clear ARP table entries
clear banner Clear Message Of The Day banner
clear cam Clear CAM table entries
clear cgmp Clear CGMP statistics
clear config Clear configuration and reset system
clear counters Clear MAC and Port counters
clear help Show this message
clear ip Clear IP, use 'clear ip help' for more info
clear log Clear log information
clear logging Clear system logging information
clear multicast Clear multicast router port
clear ntp Clear NTP servers and timezone
clear port Clear port broadcast suppression
clear snmp Clear SNMP trap receiver address
clear spantree Clear spantree port vlan priority
clear tacacs Clear TACACS server host/key
clear timezone Clear timezone
clear trunk Clear trunk ports
clear vlan Clear a VLAN
clear vmps Clear VMPS information
clear vtp Clear VTP statistics
Console> (enable)
Use the clear ip alias privileged command to clear IP aliases set using the set ip alias command.
clear ip alias {name | all}| name | Identifies a specific alias for an IP address to delete. |
| all | Specifies that all previously set aliases of IP addresses be deleted. |
This command has no default setting.
Switch command.
Privileged.
The following example shows how to delete a previously defined IP alias named babar:
Console> (enable) clear ip alias babar IP alias deleted. Console> (enable)
Use the clear ip dns domain privileged command to clear the default DNS domain name.
clear ip dns domainThis command has no arguments or keywords.
This command has no default setting.
Switch command.
Privileged.
The following examples show how to clear the default DNS domain name:
Console> (enable) clear ip dns domain
Default DNS domain name cleared.
Console> (enable)
Use the clear ip dns server privileged command to remove a DNS server from the DNS server listing.
clear ip dns server {ip_addr | all}| 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 | Keyword that specifies all the IP addresses in the DNS server listing. |
This command has no default setting.
Switch command.
Privileged.
The following 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)
Use the clear ip permit privileged command to remove entries from the IP permit list.
clear ip permit {ip_address | all} [mask]| ip_address | IP address to be cleared. An IP alias or a host name that can be resolved through DNS can also be used. |
| all | Keyword that specifies all entries in the IP permit list. |
| mask | (Optional) Specifies the subnet mask of the specified IP address. |
This command has no default setting.
Switch command.
Privileged.
This command removes a specified IP address and mask, or all IP addresses and masks from the permit list.
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.
The following example shows the usage of the clear ip permit command:
Console> (enable)clear ip permit 172.100.101.102172.100.101.102 cleared from IP permit list. Console> (enable)clear ip permit 172.160.128.0 255.255.192.0172.160.128.0 with mask 255.255.192.0 cleared from IP permit list. Console> (enable)clear ip permit allIP permit list cleared. WARNING!! IP permit list is still enabled. Console> (enable)
set ip permit
show ip permit
show snmp
Use the clear ip route privileged command to delete IP routing table entries.
clear ip route {destination gateway | all}| 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. |
| all | Keyword that specifies every entry in the IP routing table. |
This command has no default setting.
Switch command.
Privileged.
The following example shows how to delete the route table entries using the clear ip route command:
Console> (enable)clear ip route 134.12.3.0 elvisRoute deleted. Console> (enable)clear ip route allAll routes deleted. Console> (enable)
Use the clear log privileged command to delete system error log entries.
clear log [mod_num]| mod_num | (Optional) Specifies the number of the specific module for which you want to erase the system error log. |
This command has no default setting.
Switch command.
Privileged.
If you do not specify a module number, the system error log for the entire system is erased.
The following example shows how to clear the system error log:
Console> (enable) clear log
System error log cleared.
Console> (enable)
Use the clear logging buffer privileged command to clear the system logging buffer.
clear logging bufferThis command has no arguments or keywords.
This command has no default setting.
Switch command.
Privileged.
The following example shows how to clear the system logging buffer:
Console <enable> clear logging buffer
System logging buffer cleared.
Console> (enable)
Use the clear logging server privileged command to delete a syslog server from the system log server table.
clear logging server ip_addr| ip_addr | IP address of the syslog server to be deleted. |
This command has no default setting.
Switch command.
Privileged.
The following example shows how to delete a syslog server from the configuration:
Console <enable>clear logging server 171.69.192.207System log server171.69.192.207 removed from system log server table. Console> (enable)
set logging server
show logging
Use the clear multicast router privileged command to clear multicast router ports from the multicast router port list.
clear multicast router {mod_num/port_num | all}| mod _num | Number of the module. |
| port_num | Number of the port on the module. |
| all | Keyword that specifies all multicast router ports. |
The default configuration has no multicast router ports configured.
Switch command.
Privileged.
The following example shows how to clear multicast router port 1 on module 3:
Console> (enable)clear multicast router 3/1Port 3/1 cleared from multicast router port list.Console> (enable)
set multicast router
show multicast router
Use the clear ntp server privileged command to remove one or more servers from the Network Time Protocol (NTP) server table.
clear ntp server {ip_addr | all}| ip_addr | IP address of the server to remove from the server table. |
| all | Keyword that specifies all server addresses in the server table. |
The default configuration has no NTP servers configured.
Switch command.
Privileged.
The following example shows how to use the clear ntp server command to remove NTP servers from the server table:
Console> (enable) clear ntp server 172.20.22.191 NTP server 172.20.22.191 removed. Console> (enable) clear ntp server all All NTP servers cleared. Console> (enable)
Use the clear port broadcast privileged command to disable broadcast/multicast suppression on one or more ports.
clear port broadcast mod_num/port_num| mod_num | Number of the module. |
| port_num | Number of the port on the module. |
The default configuration has broadcast/multicast suppression cleared (that is, unlimited broadcast/multicast traffic allowed).
Switch command.
Privileged.
The following example shows how to disable broadcast/multicast suppression:
Console> (enable) clear port broadcast 2/1
Broadcast traffic unlimited on ports 2/1.
Console> (enable)
Use the clear snmp trap privileged command to clear an entry from the Simple Network Management Protocol (SNMP) trap receiver table.
clear snmp trap {rcvr_address | all}| rcvr_address | IP address or IP alias of the trap receiver (the SNMP management station) to clear. |
| all | Keyword that specifies every entry in the SNMP trap receiver table. |
The default configuration has no entries in the SNMP trap receiver table.
Switch command.
Privileged.
The following example shows how to clear an entry from the SNMP trap receiver table:
Console> (enable) clear snmp trap 192.122.173.82
SNMP trap receiver deleted.
Console> (enable)
set snmp trap
show snmp
test snmp trap
Use the clear spantree portvlanpri privileged command to reset the spanning-tree port VLAN priority.
clear spantree portvlanpri mod_num/port_num vlans| mod_num | Number of the module. |
| port_num | Number of the port on the module. |
| vlans | One or more VLANs. |
This command has no default setting.
Switch command.
Privileged.
The following example shows how to reset the spanning-tree port VLAN priority:
Console> (enable) clear spantree portvlanpri 1/2 23-40
Port 1/2 vlans 3,6-20,23-1000 using portpri 32
Port 1/2 vlans 1-2,4-5,21-22 using portpri 30
set spantree portvlanpri
show spantree
Use the clear tacacs key privileged command to remove the key setting used for Terminal Access Controller Access Control System Plus (TACACS+) authentication and encryption.
clear tacacs keyThis command has no arguments or keywords.
This default key value is null.
Switch command.
Privileged.
The following example shows how to clear the key setting used for authentication and encryption:
Console> (enable) clear tacacs key
TACACS server key cleared.
Console> (enable)
Use the clear tacacs server privileged command to remove a host from the list of TACACS+ servers.
clear tacacs server ip_addr| ip_addr | IP address of the server to be removed from the list of TACACS+ servers. |
There is no default setting for this command.
Switch command.
Privileged.
The following example shows how to remove a server from the list of TACACS+ servers:
Console> (enable) clear tacacs server 170.1.2.20
170.1.2.20 cleared from TACACS table
Console> (enable)
Use the clear timezone privileged command to return the time zone to its default, Coordinated Universal Time (UTC).
clear timezoneThis command has no arguments or keywords.
By default, the time zone is set to UTC.
Switch command.
Privileged.
The clear timezone command only functions when NTP is running. If you set the time manually and NTP is disengaged, the clear timezone command has no effect.
The following example shows how to clear the time zone:
Console> (enable) clear timezone Timezone name and offset cleared. Console> (enable)
Use the clear trunk privileged command to reset trunk ports to bridge ports or to clear partial information in the trunk table.
clear trunk mod_num/port_num [vlans]| mod_num | Number of the module. |
| port_num | Number of the port on the module. |
| vlans | (Optional) One or more VLANs. |
If VLANs are specified, they are removed from the list of allowed VLANs on the trunk. If you do not specify a VLAN range, the mode is set to auto for Dynamic Interswitch Link (DISL) trunk ports and off for other trunk ports. Refer to the set trunk command for more information about auto and off modes.
Switch command.
Privileged.
If VLANs are specified, only the specified VLANs are cleared from the trunk port table. Default VLANs cannot be cleared on the trunk.
The following example shows how to clear the trunk for module 1, port 2:
Console> (enable)clear trunk 1/2 2-4Vlan(s) 2-4 cleared from port 1/2. Console> (enable)clear trunk 1/2Port 1/2 mode set to auto. Console> (enable)
Use the clear vlan privileged command to delete an existing VLAN from a management domain.
clear vlan vlan_num| vlan_num | Number of the VLAN (range is 2 to 1000). |
This command has no default setting.
Switch command.
Privileged.
When a VLAN is cleared, all ports assigned to that VLAN become inactive. However, the VLAN assignments of the ports are retained until the ports are moved to another VLAN. If the cleared VLAN is reactivated, all ports still configured on that VLAN are also reactivated.
The following example shows how to clear an existing VLAN from a management domain:
Console> (enable)clear vlan 4This command will de-activate all ports on vlan 4 in the entire management domain Do you want to continue(y/n) [n]?yVTP: VLAN 4 deletion successful
Use the clear vmps server privileged command to delete a VLAN Membership Policy Server (VMPS) server from the VMPS table.
clear vmps server ip_addr| ip_addr | IP address of the VMPS server to be deleted. |
This command has no default setting.
Switch command.
Privileged.
The following example shows how to clear a VMPS server from the VMPS table:
Console> (enable)clear vmps server 172.0.0.1VMPS domain server 172.0.0.1 cleared from VMPS table. Console> (enable)clear vmps server 182.0.0.1VMPS domain server 182.0.0.1 not in VMPS table.
reconfirm vmps
set vmps server
show vmps server
Use the clear vmps statistics privileged command to delete existing VMPS statistics.
clear vmps statisticsThis command has no arguments or keywords.
This command has no default setting.
Switch command.
Privileged.
The following example shows how to delete existing VMPS statistics:
Console> (enable) clear vmps statistics Console> (enable)
Use the clear vtp pruneeligible privileged command to turn off the VLAN's pruning eligibility.
clear vtp pruneeligible vlan_num| vlan_num | VLANs for which to turn off pruning eligibility. |
The pruning function is disabled by default.
Switch command.
Privileged.
The following example shows how to turn off pruning eligibility for a number of VLANs:
Console> (enable) clear vtp pruneeligible 2,3,6-8,100-200 Vlans 1-3,6-8,100-200 will not be pruned on this device. Console> (enable)
Use the clear vtp statistics privileged command to delete the VLAN Trunk Protocol (VTP) statistics.
clear vtp statisticsThis command has no arguments or keywords.
This command has no default setting.
Switch command.
Privileged.
The following example shows how to clear the VTP statistics:
Console> (enable) clear vtp statistics
vtp statistics cleared.
Console> (enable)
set vtp
show vtp domain
show vtp help
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