HP 6120XG HP ProCurve Series 6120 Blade Switches Advanced Traffic Management G - Page 165

Multiple Instance Spanning-Tree Operation Troubleshooting an MSTP Configuration ProCurve(config)# show spanning-tree debug-counters instance 2 ports a15 Status and Counters - MSTI Port(s) Debug Counters Information MST Instance ID : 2 Port : A15 Counter Name Value Last Updated Starved MSTI MSGs 0 Exceeded Max Hops MSTI MSGs 0 Topology Changes Detected 1 02/09/07 17:40:59 Topology Changes Tx 3 02/09/07 17:41:03 Topology Changes Rx 2 02/09/07 17:41:01 MSTI MSGs Tx 5 02/09/07 17:41:03 MSTI MSGs Rx 173489 02/13/07 18:03:52 Figure 4-28. Example of show spanning-tree debug-counters instance ports Command Output for One Port in an MST Instance Field Descriptions in MSTP Debug Command Output Table 4-1 contains descriptions of the debugging information displayed in the output of show spanning-tree debug-counters commands. Table 4-1. MSTP Debug Command Output: Field Descriptions Field Invalid BPDUs Errant BPDUs Description Number of received BPDUs that failed standard MSTP (802.1Q-REV/D5.0 14.4) validation checks and were dropped. This counter is maintained by the CIST (default MST instance 0) on a per-port basis. Number of received BPDUs that were dropped on a port that is configured to not expect BPDU packets. This counter is maintained by the CIST (default MST instance 0 in the network) on a per-port basis and is incremented each time a BPDU packet is received on a port configured with the BPDU filter to ignore incoming BPDU packets (spanning-tree bpdu-filter command) or the BPDU protection feature to disable the port when BPDU packets are received (spanning-tree bpdu-protection command). 4-66