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Use the clear logging buffer 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.
This 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 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.
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)
set logging server
show logging
Use the clear mls command set to clear the MLS feature in the Catalyst 5000, 2926G, and 2926 series switches.
clear mls include {{ip_addr} | all}
include | Keyword to remove the inclusion of the specified router(s). |
ip_addr | Route-processor IP address or name of the route processor if DNS is enabled. |
all | Keyword to remove all router(s) from participation in the flow. |
nde flow | Keywords to reset the filter to the defaults. |
Keyword to clear these statistics: total packets switched and total packets exported (for NDE). | |
Keywords to clear protocols for statistics collection. | |
protocol | Number of the protocol in the protocol statistics list. |
port | Number of the port. |
all | Keyword to remove all protocols from statistics collection. |
entry | Keyword to purge the specified NFLS entry or all entries if all is specified. All matching NFLS entries are purged. |
destination | (Optional) Keyword to specify the destination IP address. |
ip_addr_spec | (Optional) Full IP address or a subnet address in these formats: ip_subnet_addr, ip_addr/subnet_mask, or ip_addr/#subnet_mask_bits. |
source | (Optional) Keyword to specify the source IP address. |
flow | (Optional) Keyword to specify additional flow information (protocol family and protocol port pair) to be matched. |
protocol | (Optional) Keyword to specify flow information; valid values include tcp, udp, icmp, or a decimal number for other protocol families. |
src_port | (Optional) Source port IP address. |
dst_port | (Optional) Destination port IP address. |
all | (Optional) Keyword to specify all NFLS entries. |
This command has no default setting.
Switch command.
Privileged.
This command is not supported by the Catalyst 4000 and 2948G series switches.
If you enter any of the clear mls commands on a Catalyst 5000, 2926G, or 2926 series switch without MLS, this warning message is displayed:
MLS not supported on feature card.When you remove an RSM from the Catalyst 5000, 2926G, or 2926 series switch, it is removed immediately from the inclusion list and all the NFLS entries for the RSM are removed.
Up to 16 routers can be included explicitly as MLS-RPs.
To use a router as an NFLS, you must meet these conditions:
Use the following syntax to specify an IP subnet address:
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 flow) and its arguments.
A 0 value for source_port and destination_port clears all entries. Unspecified options are treated as wildcards, and all entries are cleared.
This example shows how to disable MLS for the Stargate router (IP address 172.20.15.1):
Console> (enable) clear mls include Stargate Multilayer switching is disabled for router 172.20.15.1 (Stargate) Console>(enable)
This example shows how to clear the NDE filter and export all flows:
Console> (enable) clear mls nde flow Netflow data export filter cleared. Console>(enable)
This example shows how to clear MLS statistics, including total packets switched and total packets exported (for NDE):
Console> (enable) clear mls statistics Netflow data export statistics cleared. Console>(enable)
This example shows how to clear protocol 17, port 19344 from statistics collection:
Console> (enable) clear mls statistics protocol 17 19344 Protocol 17 port 1934 cleared from protocol statistics list. Console>(enable)
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 MLS entries for destination IP address 172.20.26.22:
Console>(enable) clear mls destination 172.20.26.22 source 172.20.22.113 flow tcp 520 320 Multilayer switching entry cleared Console>(enable)
set mls nde
show mls
show mls statistics
Use the clear mpoa client cache command to clear the ingress and egress cache entries of one or all MPCs.
clear mpoa client [name mpc-name] cache [ingress | egress] [ip-address ip-address]
name mpc-name | (Optional) Keyword that specifies the name of the MPC with the specified name. |
ingress | (Optional) Keyword that clears ingress cache entries associated with the MPC. |
egress | (Optional) Keyword that clears egress cache entries associated with the MPC. |
ip-address ip-address | (Optional) Keyword that clears matching cache entries with the specified IP address. |
The system defaults are:
Cisco IOS ATM command.
EXEC.
This command is not supported by the Catalyst 4000 series switch.
This example shows how to clear the ingress and egress cache entries for the MPC named ip_mpc:
ATM#clear mpoa client name ip_mpc cache ATM#
Use the clear multicast router command to clear manually configured multicast router ports from the multicast router port list.
clear multicast router all
all | Keyword that specifies all multicast router ports to be cleared. |
mod | Number of the module. |
ports.. | Number of port(s) on the module. |
The default configuration has no multicast router ports configured.
Switch command.
Privileged.
The Catalyst 2948G is a fixed-configuration switch. All ports are located on "module 2;" for this reason, if you enter 1/N for the module/port number, an error message is displayed.
This 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 command to remove one or more servers from the 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 to be removed. |
The default configuration has no NTP servers configured.
Switch command.
Privileged.
These examples show 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) Console> (enable) clear ntp server all All NTP servers cleared. Console> (enable)
Use the clear port broadcast command to disable broadcast/multicast suppression on one or more ports.
clear port broadcast mod/ports..
mod/ports.. | Number of the module and the port(s). |
The default configuration has broadcast/multicast suppression cleared (that is, unlimited broadcast/multicast traffic allowed).
Switch command.
Privileged.
This command is not supported by the Catalyst 4000 and 2948G series switches.
This 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 port filter command to clear MAC address or protocol filters, filters configured on a specific port, or to clear all configured filters.
clear port filter [mod_num/port_num] [mac_addr | protocol_type | all]
mod_num | (Optional) Number of the module. |
port_num | (Optional) Number of the port on the module. |
mac_addr | (Optional) MAC address on which the filter that you want to clear is based. This address can be entered in canonical format (00-11-33-44-55) or in noncanonical format (00:11:22:33:44:55). |
protocol_type | (Optional) Protocol type on which the filter that you want to clear is based. |
all | (Optional) Keyword to specify for all filters to be cleared. |
The command has no default setting.
Switch command.
Privileged.
The Catalyst 2948G is a fixed configuration switch. All ports are located on "module 2;" for this reason, if you enter 1/N for the module/port number, an error message is displayed.
This example shows how to clear a MAC address filter (00:40:0b:01:bc:65) configured on port 2 of module 3:
Console> (enable) clear port filter 3/2 00:40:0b:01:bc:65 Port 3/2 filter Mac Address 00:40:0b:01:bc:65 cleared. Console> (enable)
set port filter
show port filter
Use the clear snmp trap command to clear an entry from the SNMP trap receiver table.
clear snmp trap {rcvr_addr | all}
rcvr_addr | 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.
rcvr_addr is an IP alias or and IP address in dot notation, for example, 101.102.103.104.
This 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 port counters
test snmp trap
Use the clear spantree portvlancost command to restore the default path cost to a VLAN on a port.
clear spantree portvlancost mod_num/port_num preferred_vlans
mod_num | Number of the module. |
port_num | Number of the port. |
preferred_vlans | List of VLANs to clear; valid values are 1 to 1005. |
This command has no default setting.
Switch command.
Privileged.
The Catalyst 2948G is a fixed configuration switch. All ports are located on "module 2;" for this reason, if you enter 1/N for the module/port number, an error message is displayed.
This example shows how to restore the default path cost to a VLAN on a port:
Console> (enable) clear spantree portvlancost 2/10 1-10 Port 2/10 VLANs 11-21 have path cost 6 Port 2/10 VLANs 1-10,22-1000 have path cost 10. Console> (enable)
set spantree portfast
show spantree statistics
Use the clear spantree portvlanpri 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 | Number of the VLAN(s). |
trcrf | Keyword to specify the TRCRF spanning-tree port VLAN priority. |
trbrf | Keyword to specify the TRBRF spanning-tree port VLAN priority. |
This command has no default setting.
Switch command.
Privileged.
The Catalyst 2948G is a fixed configuration switch. All ports are located on "module 2;" for this reason, if you enter 1/N for the module/port number, an error message is displayed.
This 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 Console> (enable)
set spantree portvlanpri
show spantree
Use the clear spantree root command to restore the switch priority and Spanning-Tree Protocol parameters to the factory default values.
clear spantree root vlans
vlans | List of the VLAN numbers to clear; valid values are 1 to 1005. |
The default configuration has the switch priority set to 32768.
Switch command.
Privileged.
These examples show how to clear the spantree root:
Console>(enable) clear spantree root 1-20 VLANs 1-20 bridge priority set to 32678. VLANs 1-20 bridge hello time set to 2 seconds. VLANs 1-20 bridge max aging time set to 20 seconds. VLANs 1-20 bridge forward delay set to 15 seconds. Console>(enable) clear spantree root 22,24 VLANs 22,24 bridge priority set to 32678. VLANs 22,24 bridge hello time set to 2 seconds. VLANs 22,24 bridge max aging time set to 20 seconds. VLANs 22,24 bridge forward delay set to 15 seconds. Console> (enable)
set spantree root
show spantree
Use the clear spantree statistics command to clear the spanning-tree statistics on a specified module or VLAN.
clear spantree statistics mod_num/port_num
mod_num | Number of the module. |
port_num | Number of the port on the module. |
vlan | List of the VLAN numbers to clear. |
This command has no defaults.
Switch command.
Privileged.
The Catalyst 2948G is a fixed configuration switch. All ports are located on "module 2;" for this reason, if you enter 1/N for the module/port number, an error message is displayed.
This example shows how to clear the spanning-tree statistics for VLAN 1:
Console>(enable) clear spantree statistics 1 Cleared all VLAN counters for VLAN 1 Statistics cleared for vlans 1 Console> (enable)
Use the clear spantree uplinkfast command to turn off the uplinkfast feature and return the switch priority and portcosts to the factory default values.
clear spantree uplinkfastThis command has no arguments or keywords.
This command has no defaults.
Switch command.
Privileged.
This command could cause load balancing to be lost in some cases.
This example shows how to turn off the uplinkfast feature and return the switch priority to the factory default values:
Console>(enable) clear spantree uplinkfast This command will cause all portcosts, portvlancosts, and the bridge priority on all vlans to be set to default. Do you want to continue (y/n) [n]? y VLANs 1-1005 bridge priority set to 32768. The port cost of all bridge ports set to default value. The portvlancost of all bridge ports set to default value. uplinkfast disabled for bridge. Console> (enable)
set spantree uplinkfast
show spantree uplinkfast
Use the clear tacacs key command to remove the key setting used for TACACS+ authentication and encryption.
clear tacacs keyThis command has no arguments or keywords.
The default key value is null.
Switch command.
Privileged.
This 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 command to remove a host from the list of TACACS+ servers.
clear tacacs server {ip_addr | all}
all | Keyword to remove all hosts from the list of TACACS+ servers. |
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.
This 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 command to return the time zone to its default, UTC.
clear timezoneThis command has no arguments or keywords.
The default time zone is UTC.
Switch command.
Privileged.
The clear timezone command functions only when NTP is running. If you set the time manually and NTP is disengaged, the clear timezone command has no effect.
This example shows how to clear the time zone:
Console> (enable) clear timezone Timezone name and offset cleared. Console> (enable)
Use the clear top command to stop the TopN process.
clear top {all | report_num}
all | Keyword that stops all nonpending TopN results. |
report_num | TopN report number to kill; valid values are 1 to 5. |
This command has no default setting.
Switch command.
Privileged.
The clear top all command will not kill any pending TopN reports. Only the reports with a done status are killed.
You can terminate TopN processes without the background option (use the show top background command to find out if the background option is used) by pressing Ctrl-C in the same Telnet/console session, or by entering the clear top [report_num] command from a separate Telnet/console session. The prompt is not printed before the TopN report is completely displayed. Other commands will be blocked until the report has been displayed.
This example shows how to stop the TopN 1 process from a console session:
Console> (enable) clear top 1 10/18/1998,12:05:38:MGMT-5: TopN report 1 killed by Console//. Console> (enable)
This example shows how to stop all nonpending TopN reports:
Console> (enable) clear top all 10/18/1998, 12:07:06:MGMT-5: TopN report 1 killed by Console//. 10/18/1998, 12:07:06:MGMT-5: TopN report 2 killed by Console//. Console> (enable)
This example shows how to stop the TopN 4 process from a Telnet session:
Console> (enable) clear top 4 10/18/1998,12:06:00:MGMT-5: TopN report 4 killed by telnet/172.22.34.2/. Console> (enable)
mod | Number of the module. |
ports... | Number of the port(s) on the module. |
vlans | (Optional) One or more VLANs to remove from the allowed VLAN list for the trunk port; valid values are 2 to 1005. |
If you do not specify any VLANs, the mode is set to auto for ISL trunk ports and off for other trunk ports (except ATM LANE trunks, which are always on). For more information about auto and off modes, see the set trunk command.
Switch command.
Privileged.
If you specify VLANs, those VLANs are removed from the list of VLANs allowed on the trunk.
Traffic for the removed VLANs are not forwarded over a trunk port.
Default VLANs cannot be cleared on the trunk.
To add VLANs that you have removed, use the set trunk mod_num/port_num vlan_range command.
The Catalyst 2948G is a fixed configuration switch. All ports are located on "module 2;" for this reason, if you enter 1/N for the module/port number, an error message is displayed.
This example shows how to clear VLANs 200 to 500 from the trunk port on port 2 of module 1:
Console> (enable) clear trunk 1/2 200-500 Removing Vlan(s) 200-500 from allowed list. Port 1/2 allowed vlans modified to 1-199,501-1000. Console> (enable)
This example shows how to clear the trunk on port 2 of module 1:
Console> (enable) clear trunk 1/2 Port(s) 1/2 trunk mode set to auto. Port(s) 1/2 trunk type set to isl. Console> (enable)
Use the clear vlan command to delete an existing VLAN from a management domain.
clear vlan vlan_num
vlan_num | Number of the VLAN; valid value is 2 to 1000. |
This command has no default setting.
Switch command.
Privileged.
 | Caution
When you clear a VLAN, depending on the VTP configuration in the network, it might delete the VLAN from the entire VTP domain, which means every switch in the domain could delete that VLAN. If the configured switch is a VTP server and all or some of the other switches in the network are VTP clients, the change propagates to all the clients. For example, those clients will remove the VLAN from their configuration. Servers and transparent switches are unaffected; they keep the VLAN even if the VLAN is deleted by another server. |
When you clear a VLAN, all ports assigned to that VLAN become inactive. However, the VLAN port assignments are retained until you move the ports to another VLAN. If the cleared VLAN is reactivated, all ports still configured on that VLAN are also reactivated.
This example shows how to clear an existing VLAN (VLAN 4) from a management domain:
Console> (enable) clear vlan 4
This command will de-activate all ports on vlan 4
in the entire management domain
Do you want to continue(y/n) [n]? y
VTP: VLAN 4 deletion successful Console> (enable)
Use the clear vmps server command to delete a 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.
This command is not supported by the Catalyst 4000 and 2948G series switches.
This example shows how to clear a VMPS server from the VMPS table:
Console> (enable) clear vmps server 172.0.0.1 VMPS domain server 172.0.0.1 cleared from VMPS table. Console> (enable)
This example shows the results of trying to clear a nonexistent VMPS server from the VMPS table:
Console> (enable) clear vmps server 182.0.0.1 VMPS domain server 182.0.0.1 not in VMPS table. Console> (enable)
Use the clear vmps statistics command to delete existing VMPS statistics.
clear vmps statisticsThis command has no arguments or keywords.
This command has no default setting.
Switch command.
Privileged.
This command is not supported by the Catalyst 4000 and 2948G series switches.
This example shows how to delete existing VMPS statistics:
Console> (enable) clear vmps statistics VMPS and dynamic vlan statistics cleared. Console> (enable)
Use the clear vtp pruneeligible command to specify which VLANs in the VTP domain are ineligible for pruning.
clear vtp pruneeligible vlan_num
vlan_num | Number of VLANs to make pruning ineligible; valid values are 1 to 1005. |
By default, VLANs 2 to 1000 are eligible for pruning.
Switch command.
Privileged.
VTP pruning causes information about each pruning-eligible VLAN to be removed from VTP updates if no stations belong to that VLAN out a particular switch port. Use the set vtp command to enable VTP pruning.
By default, VLANs 2 to 1000 are pruning eligible. Use the clear vtp pruneeligible command to make VLANs pruning ineligible.
If VLANs are pruning ineligble, use the set vtp pruneeligible command to make the VLANs pruning eligible again.
This example shows how to make VLANs 200 to 500 pruning ineligible:
Console> (enable) clear vtp pruneeligible 200-500 Vlans 1,200-500,1001-1005 will not be pruned on this device. VTP domain Company modified. Console> (enable)
set vtp
set vtp pruneeligible
show vtp domain
Use the clear vtp statistics command to delete the VTP statistics.
clear vtp statisticsThis command has no arguments or keywords.
This command has no default setting.
Switch command.
Privileged.
This example shows how to clear the VTP statistics:
Console> (enable) clear vtp statistics vtp statistics cleared. Console> (enable)
Use the client-atm-address name command to add a LANE address entry to the configuration server's database. The no form of this command removes a client address entry from the table.
client-atm-address atm-address-template name elan-name
atm-address-template | Template that specifies an ATM address explicitly or a specific part of an ATM address and uses wildcard characters for other parts of the ATM address. Wildcard characters can replace any nibble or group of nibbles in the prefix, the ESI, or the selector fields of the ATM address. |
name | Keyword to specify the name of the ELAN. |
elan-name | Name of the ELAN. The maximum length of elan-name is 32 characters. |
By default, no address and no ELAN name are configured.
Cisco IOS ATM command.
Database configuration.
This command is not supported by the Catalyst 4000 and 2948G series switches.
This command binds to the specified ELAN any client whose address matches the specified template. When a client comes up, it consults the LANE configuration server, which responds with the ATM address of the LANE server for the ELAN. The client then initiates join procedures with the LANE server.
You must create the ELAN specified by the elan-name argument using the name server-atm-address command before you use the client-atm-address command.
If an existing entry in the configuration server's database binds the LANE client ATM address to a different ELAN, the new command is rejected.
This command affects only the bindings in the named configuration server database. It has no effect on the LANE components themselves.
A LANE ATM address has the same syntax as an NSAP but is not a network-level address:
LANE ATM address templates can use two types of wildcards: an asterisk (*) to match any single character and an ellipsis (...) to match any number of leading or trailing characters.
In LANE, a prefix template matches the prefix explicitly but uses wildcards for the ESI and selector fields. An ESI template matches the ESI field explicitly but uses wildcards for the prefix and selector.
In our implementation of LANE, the prefix corresponds to the specific subinterface of the interface.
This example uses an ESI template to specify the part of the ATM address corresponding to an interface. This template allows any client on any subinterface of the interface that corresponds to the displayed ESI value, no matter which switch the router is connected to, to join the engineering ELAN:
ATM(lane-config-database)#client-atm-address ...0800.200c.1001.** name engineering
This example uses a prefix template to specify the part of the ATM address corresponding to the switch. This template allows any client on the subinterface of any interface connected to the switch that corresponds to the displayed prefix to join the marketing ELAN:
ATM(lane-config-database)#client-atm-address 47.000014155551212f.00.00... name marketing
Use the configure command to download a configuration file from a host and execute each command in that file.
configure {host} {file}
host | IP address or IP alias of the host. |
file | Name of the file. |
This command has no default setting.
Switch command.
Privileged.
Refer to the Software Configuration Guide for your switch on how to construct a configuration file to download using the configure command.
Following is a sample file called system5.cfg in the /tftpboot directory:
begin show time set ip alias conc7 198.133.219.207 set ip alias montreux 198.133.119.42 set ip alias cres 192.122.174.42 set prompt system5> set password # empty string old password pingpong pingpong end #
Each line contains a command, except lines that begin with ! or #.
This example shows how to download the system5.cfg configuration file from the 192.122.174.42 host:
Console> (enable) configure 192.122.174.42 system5.cfg Configure using system5.cfg from 192.122.174.42 (y/n) [n]? y / Done. Finished Network Download. (446 bytes) >> show time Wed Nov 11 1998, 17:42:50 >> set ip alias conc7 198.133.219.207 IP alias added. >> set ip alias montreux 198.133.219.40 IP alias added. >> set ip alias cres 192.122.174.42 IP alias added. >> set prompt system5> >> set password Enter old password: Enter new password: pingpong Retype new password: pingpong Password changed. system5> (enable)
Use the confreg command to configure the configuration register utility.
confreg [num]
num | (Optional) Valid values are 0 = ROM monitor, 1 = the boot helper image, and 2-15 = boot system. |
This command has no defaults.
ROM monitor command.
Normal.
Executed with the argument num, confreg changes the VCR to match the number specified.
Without the argument, confreg dumps the contents of the VCR and allows you to alter the contents.
You are prompted to change or keep the information held in each bit of the VCR. In either case, the new VCR value is written into NVRAM and does not take effect until you reset or power cycle the platform.
You must issue a sync command. Otherwise, the change is not saved and a reset removes your change.
This example shows how to use the confreg command:
rommon 7 > confreg
Configuration Summary
enabled are:
console baud: 9600
boot: the ROM Monitor
do you wish to change the configuration? y/n [n]: y
enable "diagnostic mode"? y/n [n]: y
enable "use net in IP bcast address"? y/n [n]:
enable "load rom after netboot fails"? y/n [n]:
enable "use all zero broadcast"? y/n [n]:
enable "break/abort has effect"? y/n [n]:
enable "ignore system config info"? y/n [n]:
change console baud rate? y/n [n]: y
enter rate: 0 = 9600, 1 = 4800, 2 = 1200, 3 = 2400
4 = 19200, 5 = 38400, 6 = 57600, 7 = 115200 [0]: 0
change the boot characteristics? y/n [n]: y
enter to boot:
0 = ROM Monitor
1 = the boot helper image
2-15 = boot system
[0]: 0
Configuration Summary
enabled are:
diagnostic mode
console baud: 9600
boot: the ROM Monitor
do you wish to change the configuration? y/n [n]:
You must reset or power cycle for new config to take effect
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