B-25
Cisco ME 3800X and ME 3600X Switch Command Reference
OL-28238-01
Appendix B Cisco ME 3800X and ME 3600X Switch Debug Commands
debug spanning-tree mstp
debug spanning-tree mstp
To enable debugging of the Multiple Spanning Tree Protocol (MSTP) feature, use the debug
spanning-tree mstp command in privileged EXEC mode. To disable debugging, use the no form of this
command.
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 Enables all the debugging messages.
boundary Displays 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 IEEE 802.1D
• An MST region and another MST region with a different configuration
bpdu-rx Displays the received MST bridge protocol data units (BPDUs).
bpdu-tx Displays the sent MST BPDUs.
errors Displays MSTP errors.
flush Displays the port flushing mechanism.
init Displays the initialization of the MSTP data structures.
migration Debug the protocol migration state machine.
pm Displays MSTP port manager events.
proposals Displays handshake messages between the designated switch and the root switch.
region Displays the region synchronization between the switch processor (SP) and the route
processor (RP).
roles Displays MSTP roles.
sanity_check Displays the received BPDU sanity check messages.
sync Displays the port synchronization events.
tc Displays topology change notification events.
timers Displays the MSTP timers for start, stop, and expire events.
Release Modification
12.2(52)EY This command was introduced.
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