Cisco Catalyst 3550

B-41
Catalyst 3550 Multilayer Switch Command Reference
OL-8566-02
Appendix B Catalyst 3550 Switch Debug Commands
debug spanning-tree mstp
debug spanning-tree mstp
Use the debug spanning-tree mstp privileged EXEC command to enable debugging of the Multiple
Spanning Tree Protocol (MSTP) software. Use the no form of this command to disable debugging.
debug spanning-tree mstp {all | boundary | bpdu-rx | bpdu-tx | errors | flush | init | migration
| pm | proposals | region | roles | sanity_check | sync | tc | timers}
no debug spanning-tree mstp {all | boundary | bpdu-rx | bpdu-tx | errors | flush | init | migration
| pm | proposals | region | roles | sanity_check | sync | tc | timers}
Syntax Description
Defaults Debugging is disabled.
Command Modes Privileged EXEC
Command History
all Display all the debug messages.
boundary Display flag changes at these boundaries:
• An MST region and a single spanning-tree region running RSTP
• An MST region and a single spanning-tree region running IEEE 802.1D
• An MST region and another MST region with a different configuration
bpdu-rx Display the received MST bridge protocol data unit (BPDU) debug messages.
bpdu-tx Display transmitted MST BPDU debug messages.
errors Display MSTP error debug messages.
flush Display the port flushing mechanism debug messages.
init Display the initialization of the MSTP data structure debug messages.
migration Display the protocol migration state-machine debug messages.
pm Display MSTP port-manager event debug messages.
proposals Display debug messages for handshake messages between the designated and root
switch.
region Display debug messages for the region synchronization between the switch
processor (SP) and the route processor (RP).
roles Display MSTP role debug messages.
sanity_check Display the received BPDU sanity check debug messages.
sync Display the port synchronization event debug messages.
tc Display topology change notification event debug messages.
timers Display debug messages for the MSTP timers for start, stop, and expire events.
Release Modification
12.1(9)EA1 This command was introduced.