Administrator Guide

spanning-tree configuration name Tahiti
spanning-tree configuration revision 123
spanning-tree MSTi instance 1
spanning-tree MSTi vlan 1 100
spanning-tree MSTi instance 2
spanning-tree MSTi vlan 2 200
spanning-tree MSTi vlan 2 300
(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.
Multiple Spanning Tree Protocol (MSTP) 617