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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 multicast router command to clear manually configured 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 to be cleared. |
The default configuration has no multicast router ports configured.
Switch command.
Privileged.
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.
This example shows how to remove a specific NTP server from the server table:
Console> (enable) clear ntp server 172.20.22.191 NTP server 172.20.22.191 removed. Console> (enable)
This example shows how to remove all NTP servers from the server table:
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_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.
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)
set port broadcast
show port broadcast
Use the clear port qos cos command to return the values set by the set port qos cos command to the factory-set default values for all specified ports.
clear port qos mod/ports.. cos
mod/ports.. | Number of the module and port(s). |
The default CoS for a port is 0.
Switch command.
Privileged.
This example shows how to return the values set by the set port qos cos command to the factory-set default values for module 2, port 1:
Console> (enable)clear port qos 2/1 cosPort 2/1 qos cos setting cleared.Console> (enable)
Use the clear qos config command to return the values set by the set qos command to the factory-set default values and delete the CoS assigned to MAC addresses.
clear qos configThis command has no arguments or keywords.
Refer to Table 2-1 for the QoS default settings:
| Parameter | Default |
|---|---|
| QoS enabled | |
Transmit drop thresholds | queue 1 - 40%, 100% |
Receive drop thresholds | queue 1 - 50%, 60%, 80%, 100% if the port is trusted |
WRR | 100:255 |
Transmit queue size | 80:20 |
CoS to threshold map | queue 1, threshold 1 - 0,1 |
| QoS disabled | |
Transmit drop thresholds | queue 1 - 100% 100% |
Receive drop thresholds | queue 1 - 100%, 100%, 100%, 100% |
WRR | 255:1 |
Transmit queue size | 100:0 |
CoS to threshold map | queue 1, threshold 1 - 0,1,2,3,4,5,6,7 |
Switch command.
Privileged.
This example shows how to return the values set by the set qos command to the factory-set default values and delete the CoS assigned to MAC addresses:
Console> (enable) clear qos config
This command will disable QoS and take values back to factory default.
Do you want to continue (y/n) [n]? y
QoS config cleared.
Console> (enable)
Use the clear qos mac-cos command to clear the values set by the set qos mac-cos command.
clear qos mac-cos dest_mac [vlan]
dest_mac | Number of the destination host MAC address. |
vlan | (Optional) Number of the VLAN. |
all | Keyword to clear CoS values for all MAC/VLAN pairs. |
This command has no default setting.
Switch command.
Privileged.
If the vlan number is not entered, all entries for the MAC address are cleared.
This example shows how to clear the values set by the set qos mac-cos command and return to the factory-set default values for all MAC address and VLAN pairs:
Console> (enable) clear qos mac-cos allAll CoS to Mac/Vlan entries are cleared.Console> (enable)
This example shows how to clear the values set by the set qos mac-cos command and return to the factory-set default values for a specific MAC address:
Console> (enable)clear qos mac-cos 1-2-3-4-5-6 1CoS to Mac/Vlan entry for mac 01-02-03-04-05-06 vlan 1 is cleared.Console> (enable)
set qos mac-cos
show qos mac-cos
Use the clear qos map command to return the values set by the set qos map command to the factory-set default values.
clear qos map port_type
port_type | Port type value; the only valid value is 2q2t. |
The default mappings for all ports are shown in Table 2-2 and Table 2-3 and applies to all ports.
| Low delay (Queue 2) | High delay (Queue 1) | |
|---|---|---|
| Low drop (Threshold 2) | 7,6 | 3,2 |
| High drop (Threshold 1) | 5,4 | 1,0 |
| Threshold 1 (highest drop possibility) | Threshold 2 | Threshold 3 | Threshold 4 (lowest drop possibility) |
|---|---|---|---|
0,1 | 2,3 | 4,5 | 6,7 |
Switch command.
Privileged.
This example shows how to return the values set by the set qos map command to the factory-set default values:
Console> (enable)clear qos map 2q2t This command will take map values back to factory default.QoS map cleared.Console> (enable)
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.
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 [vlan_list]
mod_num | Number of the module. |
port_num | Number of the port. |
vlan_list | (Optional) List of VLANs to clear. If not specified, all VLANs are cleared. |
This command has no default setting.
Switch command.
Privileged.
These examples show 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) Console>(enable) clear spantree portvlancost 2/10 Port 2/10 VLANs 1-1000 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 | (Optional) One or more VLANs. |
This command has no default setting.
Switch command.
Privileged.
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 [vlan_list]
vlan_list | (Optional) List of the VLAN numbers to clear. |
The default configuration has the switch priority set to 32768.
Switch command.
Privileged.
This example shows how to clear the spantree root on a range of VLANs:
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.
This example shows how to clear the spantree root on two specific VLANs:
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.
clear spantree statistics [vlan_list]
vlan_list | (Optional) List of the VLAN numbers to clear. |
This command has no default setting.
Switch command.
Privileged.
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 to return the switch priority and portcosts to the factory default values.
clear spantree uplinkfastThis command has no arguments or keywords.
This command has no default setting.
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 to 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
ip_addr | IP address of the server to be removed from the list of TACACS+ servers. |
This command has no default setting.
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. |
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 10/29/1998,12:05:38:MGMT-5: TopN report 1 killed by Console//. Console> (enable)
This example shows how to stop the TopN 4 process from a Telnet session:
Console> (enable) clear top 4 10/29/1998,12:06:00:MGMT-5: TopN report 4 killed by telnet/172.22.34.2/. Console> (enable)
mod_num | Number of the module. |
port_num | Number of the port on the module. |
vlans | (Optional) One or more VLANs to remove from the allowed VLAN list for the trunk port. |
If you do not specify any VLANs, the mode is set to auto for ISL trunk ports and off for other trunk ports. 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. Default VLANs cannot be cleared on the trunk.
Traffic for the removed VLANs are not forwarded over a trunk port. To add VLANs that you have removed, use the set trunk mod_num/port_num vlan_range command.
This example shows how to clear VLANs 200 through 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 (range 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.
A warning is displayed if you clear a VLAN that exists in the mapping table.
This example shows how to clear existing 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 vlan mapping command to delete existing 802.1Q VLAN to ISL VLAN-mapped pair(s).
clear vlan mapping dot1q 1q_vlan_num | all
dot1q | Keyword to specify the VLAN type as 802.1Q. |
1q_vlan_num | Number identifying the 802.1Q VLAN. |
all | Keyword to clear the mapping table of all entries. |
This command has no default setting.
Switch command.
Privileged.
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 mapped VLAN (VLAN 4) from the mapping table:
Console> (enable) clear vlan mapping dot1q 444 Vlan Mapping 444 Deleted. Console> (enable)
This example shows how to clear all mapped VLANs from the mapping table:
Console> (enable) clear vlan mapping dot1q all All Vlan Mapping Deleted. 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. |
The default is VLANs 2 through 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 through 1000 are pruning eligible. Use the clear vtp pruneeligible command to make VLANs pruning ineligible.
If VLANs are pruning ineligible, use the set vtp pruneeligible command to make the VLANs pruning eligible again.
This example shows how to make VLANs 200 through 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
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