MSTP (Multiple Spanning Tree Protocol)
spanning-tree mode mst
## MST Configuration ##
spanning-tree mst configuration
name MyTree
revision 1
## Map VLANs to instances ##
instance 1 vlan 20, 30
instance 2 vlan 40, 50
## Bridge priority (per instance) ##
spanning-tree mst 1 priority 32768
## Timers, in seconds ##
spanning-tree mst hello-time 2
spanning-tree mst forward-time 15
spanning-tree mst max-age 20
## Maximum hops for BPDUs ##
spanning-tree mst max-hops 20
## Interface attributes ##
interface FastEthernet0/1
spanning-tree mst 1 port-priority 128
spanning-tree mst 1 cost 19