Debug Spanning-Tree Mstp - Cisco Catalyst 2950 Command Reference Manual

Appendix C Catalyst 2950 and 2955 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-10102-01
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 MSTP debug messages.
Display flag change debug messages at these boundaries:
• An multiple spanning-tree (MST) region and a single spanning-tree region
running Rapid Spanning Tree Protocol (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 received MST bridge protocol data unit (BPDUs) debug messages.
Display sent MST BPDU debug messages.
Display MSTP error debug messages.
Display port-flushing mechanism debug messages.
Display MSTP data structure initialization debug messages.
Display protocol-migration state-machine debug messages.
Display MSTP port-manager event debug messages.
Display handshake messages between the designated switch and the root switch
debug messages.
Display region synchronization between the switch processor (SP) and the route
processor (RP) debug messages.
Display MSTP role debug messages.
Display received BPDU sanity check debug messages.
Display port synchronization event debug messages.
Display topology change notification event debug messages.
Display MSTP timers for start, stop, and expire event debug messages.
Modification
This command was introduced.
Catalyst 2950 and Catalyst 2955 Switch Command Reference
debug spanning-tree mstp
C-15