Cisco Catalyst 4500 Series Command Reference Manual page 1014

spanning-tree mst root
Examples This example shows how to set the priority and timer values for the bridge:
Switch(config)# spanning-tree mst 0 root primary diameter 7 hello-time 2
Switch(config)# spanning-tree mst 5 root primary
Switch(config)#
Related Commands Command
show spanning-tree mst
Catalyst 4500 Series Switch Cisco IOS Command Reference—Release IOS XE 3.3.0SG and IOS 15.1(1)SG)
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Chapter 2 Cisco IOS Commands for the Catalyst 4500 Series Switches
Description
Displays MST protocol information.
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