Users Guide

Spanning Tree Protocol 891
4 Create MST instances 20 and associate it to VLAN 20.
console(config-mst)#instance 20 add vlan 20
5 Change the region name and revision number so that all the bridges that
want to be part of the same region can form the region. This step is
required for MST to operate properly.
console(config-mst)#name dell
console(config-mst)#revision 0
console(config-mst)#exit
6 (Switch A only) Configure Switch A to be the root bridge of the spanning
tree (CIST Regional Root) by configuring a higher root bridge priority.
console(config)#spanning-tree priority 8192
7 (Switch A only) Make Switch A the Regional Root for MSTI 1 by
configuring a higher priority for MST ID 10.
console(config)#spanning-tree mst 10 priority 12288
8 (Switch A only) Change the priority of MST ID 20 to ensure Switch C is
the Regional Root bridge for this MSTI.
console(config)#spanning-tree mst 20 priority 61440
console(config)#spanning-tree priority 8192
9 (Switch C only) Change the priority of port 1 to force it to be the root port
for MST 20.
console(config)#interface gi1/0/1
console(config-if-Gi1/0/1)#spanning-tree mst 20 port-priority
64
console(config-if-Gi1/0/1)#exit