Spanning-tree uplink fast

[Ech]

Tôi có hai con switch kết nối qua 2 cổng Etherrnet. Liệu tôi có thể enable uplink fast được ko? Tôi test thử nhưng có vể nó ko hoạt động theo ý mình.


Cat3560#sh run | in uplink
spanning-tree uplinkfast

Cat3560#sh spanning-tree uplinkfast
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 Fa0/7(fwd), Fa0/8

Cat3560#sh spanning-tree

VLAN0001
Spanning tree enabled protocol ieee
Root ID Priority 20481
Address 000b.4610.e380
Cost 19
Port 8 (FastEthernet0/7)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 20481 (priority 20480 sys-id-ext 1)
Address 001c.b0d9.0280
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300

Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Fa0/7 Root FWD 19 128.8 P2p
Fa0/8 Altn BLK 19 128.9 P2p

Cat3560#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Cat3560(config)#int fa0/7
Cat3560(config-if)#shut
Cat3560(config-if)#
0223: STP: VLAN0001 new root port Fa0/8, cost 19
0223: STP: VLAN0001 Fa0/8 -> listening
0224: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan1, changed state to down
0225: %LINK-5-CHANGED: Interface FastEthernet0/7, changed state to administratively down
0225: STP: VLAN0001 sent Topology Change Notice on Fa0/8
0226: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/7, changed state to down
0238: STP: VLAN0001 Fa0/8 -> learning
0253: STP: VLAN0001 Fa0/8 -> forwarding
0254: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan1, changed state to up