spanning-tree vlan 50 priority 24626 - the lower priority is the root bridge
spanning-tree vlan 50 root primary
spanning-tree vlan 50 cost 4
spanning-tree portfast - tight with bpduguard to advoide a user plug a portfast port to a swicth that cuase a loop and networ broadcast storm.
spanning-tree uplinkfast
spanning-tree backbonefast
root port
designesed port
alternate port
backup port
disable port
