Administrator Guide

3. Create VLANs mapped to MSTP instances tag interfaces to the VLANs.
(Step 1)
spanning-tree
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 Congurations
To debut and verify MSTP conguration, 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 Conguration
Example of Viewing the Debug Log (Successful MSTP Conguration)
Example of Viewing the Debug Log (Unsuccessful MSTP Conguration)
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 conguration, use the show spanning-tree mst commands.
To view the overall MSTP conguration on the router, use the show running-configuration spanning-tree mstp in
EXEC Privilege mode.
522
Multiple Spanning Tree Protocol (MSTP)