Multiple Spanning Tree Protocol (MST)

Supports up to 4096 instances of Spanning Tree

(config)#spanning-tree mode mst
(config)#spanning-tree mst configuration
(config-mst)#revision 1
(config-mst)#instance 1 vlan 12, 34
(config-mst)#instance 2 vlan 56, 90
(config-mst)#name CCIE <--- MST REGION NAME

SW2#show spanning-tree mst configuration
Name      [ ]
Revision  1     Instances configured 3

Instance  Vlans mapped
--------  ---------------------------------------------------------------------
0         1-11,13-33,35-55,57-89,91-4094
1         12,34
2         56,90
-------------------------------------------------------------------------------

Check the ROOT:
#show spanning-tree root
                                        Root    Hello Max Fwd
MST Instance           Root ID          Cost    Time  Age Dly  Root Port
---------------- -------------------- --------- ----- --- ---  ------------
MST0             32768 aabb.cc00.0600         0    2   20  15
MST1                 1 aabb.cc00.0600         0    2   20  15
MST2              4098 aabb.cc00.0600         0    2   20  15

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