Troubleshooting Spanning Tree
Spanning Tree debug commands

The debug spanning-tree command is used to troubleshoot spanning-tree activities.

CAUTION:

Keep in mind that enabling debugging, especially to a console or auxiliary port can cause excessive processor utilization on an infrastructure device. If debugging commands must be issued, consider disabling console logging and send the output to a terminal session. Additionally, remember to turn off all debugging when the appropriate data has been collected.