Specifications

B-14
Catalyst 2950 and Catalyst 2955 Switch Command Reference
78-15304-01
Chapter B 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
output.
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 Enable all the debugging messages.
boundary Debug 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 802.1D
• An MST region and another MST region with a different configuration
bpdu-rx Debug the received MST bridge protocol data units (BPDUs)
bpdu-tx Debug the transmitted MST BPDUs.
errors Debug MSTP errors.
flush Debug the port flushing mechanism.
init Debug the initialization of the MSTP data structures.
migration Debug the protocol migration state machine.
pm Debug MSTP port manager events.
proposals Debug handshake messages between the designated and root switch.
region Debug the region synchronization between the switch processor (SP) and the route
processor (RP).
roles Debug MSTP roles.
sanity_check Debug the received BPDU sanity check messages.
sync Debug the port synchronization events.
tc Debug topology change notification events.
timers Debug the MSTP timers for start, stop, and expire events.
Release Modification
12.1(9)EA1 This command was first introduced.