직접 연결된 링크가 다운 되었을 때 차단 상태에 있는 포트를 즉시 전송 상태로 변경 시키기 위해 사용.

셋팅

HQ_SE_1F_SW1(config)#spanning-tree uplinkfast

적용 전 (30초)

03:39:07: STP: VLAN0010 new root port Fa0/2, cost 38

03:39:07: STP: VLAN0010 Fa0/2 -> listening

03:39:09: %LINK-5-CHANGED: Interface FastEthernet0/1, changed state to administratively down

03:39:09: STP: VLAN0010 sent Topology Change Notice on Fa0/2

03:39:10: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to down

03:39:22: STP: VLAN0010 Fa0/2 -> learning

03:39:37: STP: VLAN0010 Fa0/2 -> forwarding

적용 후 (5초이내)

03:15:07: STP: VLAN0010 new root port Fa0/2, cost 3038

03:15:07: %SPANTREE_FAST-7-PORT_FWD_UPLINK: VLAN0010 FastEthernet0/2 moved to Forwarding (UplinkFast).

03:15:09: %LINK-5-CHANGED: Interface FastEthernet0/1, changed state to administratively down

03:15:09: STP: VLAN0010 sent Topology Change Notice on Fa0/2

03:15:10: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to down

UplinkFast is enabled

Station update rate set to 150 packets/sec.

UplinkFast statistics

-----------------------

Number of transitions via uplinkFast (all VLANs)            : 0

Number of proxy multicast addresses transmitted (all VLANs) : 0

Name                 Interface List

-------------------- ------------------------------------

VLAN0001             Fa0/2(fwd)

VLAN0010             Fa0/2(fwd)