Viewing debug counters per-port per-VLAN
Syntax:
show spanning-tree debug ports port-list vlan vlan-id
Displays the aggregate values of all RPVST+ debug counters maintained on one or more ports used by a specified VLAN.
Viewing debug counters for a specific port on a VLAN
Switch_A(config)# show spanning-tree debug ports 9 vlan 20 Status and Counters - RPVST Debug Counters Information VLAN ID : 20 Port : 9 Counter Name Value Last Updated ------------------------------ --------------- -------------------- Invalid BPDUs 0 04/16/2012 22:27:15 Errant BPDUs 0 04/16/2012 22:27:15 Looped-back BPDUs 0 04/16/2012 22:27:15 Starved BPDUs 5 05/01/2012 21:48:11 Exceeded Max Age BPDUs 0 04/16/2012 22:27:15 Topology Changes Detected 9 05/04/2012 21:54:05 Topology Changes Tx 5 05/05/2012 22:04:49 Topology Changes Rx 2 05/07/2012 18:08:34 Topology Change ACKs Tx 0 04/16/2012 22:27:15 Topology Change ACKs Rx 0 04/16/2012 22:27:15 TCN BPDUs Tx 0 04/16/2012 22:27:15 TCN BPDUs Rx 0 04/16/2012 22:27:15 CFG BPDUs Tx 0 04/16/2012 22:27:15 CFG BPDUs Rx 0 04/16/2012 22:27:15 RST BPDUs Tx 0 04/16/2012 22:27:15 RST BPDUs Rx 0 04/16/2012 22:27:15 RPVST BPDUs Tx 7812 05/05/2012 22:04:49 RPVST BPDUs Rx 1065 05/08/2012 19:43:11