Overflow counters consist of IPv6 addresses that are not added to IP Source Guard (IPSG) due to lack of filter resources. Use this procedure to clear the overflow counters for an IPSG port.
enable
configure terminal
interface GigabitEthernet {slot/port[/sub-port][-slot/port[/sub-port]][,...][slot/all][all]}
Note
If the platform supports channelization and the port is channelized, you must also specify the sub-port in the format slot/port/sub-port.
ipv6 source-guard overflow-count clear
show ipv6 source-guard interface gigabitEthernet [{slot/port[/sub-port][-slot/port[/sub-port]][,...][slot/all][all]}]
show ipv6 source-guard interface enabled
Clear overflow counters on the IPSG port 1/1.
Switch:1>enable Switch:1#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Switch:1(config)#interface gigabitEthernet 1/1 Switch:1(config-if)#ipv6 source-guard overflow-count clear
Verify the configuration on port 1/1.
Switch:1(config-if)#show ipv6 source-guard interface gigabitEthernet 1/1 Slot/Port Source Guard Number of IPv6 Address Mode address allowed overflow count ========================================================== 1/1 Enabled 10 0
Optionally, view the overflow counters on all IPSG enabled ports.
Switch:1(config-if)#show ipv6 source-guard interface enabled Slot/Port Source Guard Number of IPv6 Address Mode address allowed overflow count ========================================================== 1/1 Enabled 4 0 1/2 Enabled 9 0