Command Guide of WGSW-28040
Example:
This example sets port gi1 MST port priority of MST instance 0 to 32.
Switch# configure
Switch(config)# interface gi1
Switch(config-if)# spanning-tree mst 1 cost 0
Switch(config-if)# exit
Switch(config)# interface gi1
Switch(config-if)# spanning-tree mst 1 port-priority 32
316