Debug Spanning-Tree Mstp - Cisco Catalyst 3550 Command Reference Manual

Appendix B Catalyst 3550 Switch Debug Commands

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.
Syntax Description all
boundary
bpdu-rx
bpdu-tx
errors
flush
init
migration
pm
proposals
region
roles
sanity_check
sync
tc
timers
Defaults Debugging is disabled.
Command Modes
Privileged EXEC
Command History Release
12.1(9)EA1
OL-8566-02
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}
Display all the debug messages.
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
Display the received MST bridge protocol data unit (BPDU) debug messages.
Display transmitted MST BPDU debug messages.
Display MSTP error debug messages.
Display the port flushing mechanism debug messages.
Display the initialization of the MSTP data structure debug messages.
Display the protocol migration state-machine debug messages.
Display MSTP port-manager event debug messages.
Display debug messages for handshake messages between the designated and root
switch.
Display debug messages for the region synchronization between the switch
processor (SP) and the route processor (RP).
Display MSTP role debug messages.
Display the received BPDU sanity check debug messages.
Display the port synchronization event debug messages.
Display topology change notification event debug messages.
Display debug messages for the MSTP timers for start, stop, and expire events.
Modification
This command was introduced.
Catalyst 3550 Multilayer Switch Command Reference
debug spanning-tree mstp
B-41