Debug Spanning-Tree Mstp - Cisco Catalyst 2960 Command Reference Manual

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.
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
12.2(25)FX
Catalyst 2960 Switch Command Reference
B-60
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 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 802.1D
An MST region and another MST region with a different configuration
•
Debug the received MST bridge protocol data units (BPDUs).
Debug the sent 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 switch and the 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 introduced.
Appendix B Catalyst 2960 Switch Debug Commands
78-16882-01