Reference Guide

(Step 2)
interface 1/0/31
no shutdown
spanning-tree port mode enable
switchport protected 0
exit
interface 1/0/32
no shutdown
spanning-tree port mode enable
switchport protected 0
exit
(Step 3)
interface vlan 100
tagged 1/0/31
tagged 1/0/32
exit
interface vlan 200
tagged 1/0/31
tagged 1/0/32
exit
interface vlan 300
tagged 1/0/31
tagged 1/0/32
exit
Debugging and Verifying MSTP Configurations
To debut and verify MSTP configuration, use the following commands.
• Display BPDUs.
EXEC Privilege mode
debug spanning-tree mstp bpdu
• Display MSTP-triggered topology change messages.
debug spanning-tree mstp events
Example of Viewing MSTP Configuration
Example of Viewing the Debug Log (Successful MSTP Configuration)
Example of Viewing the Debug Log (Unsuccessful MSTP Configuration)
To ensure all the necessary parameters match (region name, region version, and VLAN to instance
mapping), examine your individual routers.
To show various portions of the MSTP configuration, use the show spanning-tree mst commands.
To view the overall MSTP configuration on the router, use the show running-configuration
spanning-tree mstp in EXEC Privilege mode.
To monitor and verify that the MSTP configuration is connected and communicating as desired, use the
debug spanning-tree mstp bpdu command.
Key items to look for in the debug report include:
Multiple Spanning Tree Protocol (MSTP)
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