Flushing Routing, MAC, and ARP Tables for a VLAN

Flush or clear the routing tables for administrative and troubleshooting purposes. The clear and flush commands perform the same function; they remove the contents of the table.

Procedure

Enter Global Configuration mode:

enable

configure terminal
Flush IP routing tables by VLAN:

vlan action <1-4059> flushIp
Flush the MAC address tables by VLAN:

vlan action <1-4059> flushMacFdb
Note

Flushing MAC address tables multiple times in a very short period of time can cause undefined errors. Wait at least 10 seconds between MAC flushes on VSP 8600 Series.
Flush ARP tables by VLAN:

vlan action <1-4059> flushArp
Flush all tables with one command:

vlan action <1-4059> all
Clear a routing table for a VLAN:

clear ip route vlan <1-4059>

Example

Switch:1>enable
Switch:1#configure terminal
Switch:1(config-if)#vlan action 123 all
Switch:1(config)#clear ip route vlan 123

Variable Definitions

The following table defines parameters for the vlan action and clear ip route vlan commands.


Variable	Value
`<1-4059>`	Specifies the VLAN ID in the range of 1 to 4059. By default, VLAN IDs 1 to 4059 are configurable and the system reserves VLAN IDs 4060 to 4094 for internal use. On switches that support the vrf-scaling and spbm-config-mode boot configuration flags, if you enable these flags, the system also reserves VLAN IDs 3500 to 3998. VLAN ID 1 is the default VLAN and you cannot create or delete VLAN ID 1.