Debug Spanning-Tree Mstp - Cisco Catalyst 3550 Command Reference Manual
Multilayer switch
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Also See for Catalyst 3550:
- Command reference manual (794 pages) ,
- Installation manual (154 pages) ,
- Hardware installation manual (106 pages)
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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.
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
Catalyst 3550 Multilayer Switch Command Reference
B-36
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}
Enable all the debugging messages.
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
•
Debug the received MST bridge protocol data units (BPDUs)
Debug the transmitted MST BPDUs.
Debug MSTP errors.
Debug the port flushing mechanism.
Debug the initialization of the MSTP data structures.
Debug the protocol migration state machine.
Debug MSTP port manager events.
Debug handshake messages between the designated and root switch.
Debug the region synchronization between the switch processor (SP) and the route
processor (RP).
Debug MSTP roles.
Debug the received BPDU sanity check messages.
Debug the port synchronization events.
Debug topology change notification events.
Debug the MSTP timers for start, stop, and expire events.
Modification
This command was first introduced.
Appendix B
Debug Commands
78-11195-09
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