port channel 与 Spanning tree连接的区别
bluestudy_a(config)#interface fastEthernet 0/1
bluestudy_a(config-if)#port group 2
bluestudy_a(config-if)#
bluestudy_a(config)#interface fastEthernet 0/2
bluestudy_a(config-if)#port group 2
bluestudy_a(config-if)#
bluestudy_b(config)#interface fastEthernet 0/23
bluestudy_b(config-if)#port group 2
bluestudy_b(config-if)#
bluestudy_b(config)#interface fastEthernet 0/24
bluestudy_b(config-if)#port group 2
bluestudy_a(config-if)#
这时在bluestudy_a与bluestudy_b之间连接的两条双较线的端口灯均是绿色，表示二者传输数据正常。
现在我将双方之间的channel配置去掉
bluestudy_a(config)#interface fastEthernet 0/1
bluestudy_a(config-if)#no port group 2
bluestudy_a(config-if)#
bluestudy_a(config)#interface fastEthernet 0/2
bluestudy_a(config-if)#no port group 2
bluestudy_a(config-if)#
bluestudy_b(config)#interface fastEthernet 0/23
bluestudy_b(config-if)#no port group 2
bluestudy_b(config-if)#
bluestudy_b(config)#interface fastEthernet 0/24
bluestudy_b(config-if)#no port group 2
bluestudy_a(config-if)#
然后打开Spanning tree
bluestudy_a(config)#spanning-tree vlan 1
bluestudy_a(config)#
bluestudy_b(config)#spanning-tree vlan 1
bluestudy_b(config)#
在交换机b上查看Spanning tree状态
bluestudy_b#show spanning-tree vlan 1
Spanning tree 1 is executing the IEEE compatible Spanning Tree protocol
Bridge Identifier has priority 32768, address 0006.d74f.6700
Configured hello time 2, max age 20, forward delay 15
Current root has priority 32768, address 0006.5329.cd80
Root port is 13, cost of root path is 19
Topology change flag not set, detected flag not set, changes 30
Times: hold 1, topology change 35, notification 2
hello 2, max age 20, forward delay 15
Timers: hello 0, topology change 0, notification 0
Interface Fa0/1 (port 13) in Spanning tree 1 is FORWARDING
Port path cost 19, Port priority 128
Designated root has priority 32768, address 0006.5329.cd80
Designated bridge has priority 32768, address 0006.5329.cd80
Designated port is 37, path cost 0
Timers: message age 1, forward delay 0, hold 0
BPDU: sent 2, received 358
Interface Fa0/2 (port 14) in Spanning tree 1 is BLOCKING
Port path cost 19, Port priority 128
Designated root has priority 32768, address 0006.5329.cd80
Designated bridge has priority 32768, address 0006.5329.cd80
Designated port is 38, path cost 0
Timers: message age 0, forward delay 0, hold 0
BPDU: sent 1, received 351
Interface Fa0/3 (port 15) in Spanning tree 1 is down
Port path cost 100, Port priority 128
Designated root has priority 32768, address 0006.5329.cd80
Designated bridge has priority 32768, address 0006.d74f.6700
Designated port is 15, path cost 19
Timers: message age 0, forward delay 0, hold 0
BPDU: sent 1, received 0
在交换机a上查看Spanning tree状态
bluestudy_b#show spanning-tree vlan 1
Interface Fa0/23 (port 37) in Spanning tree 1 is FORWARDING
Port path cost 19, Port priority 128
Designated root has priority 150, address 0006.d74f.6700
Designated bridge has priority 150, address 0006.d74f.6700
Designated port is 13, path cost 0
Timers: message age 4, forward delay 0, hold 0
BPDU: sent 453, received 119
Interface Fa0/24 (port 38) in Spanning tree 1 is BLOCKING
Port path cost 19, Port priority 128
Designated root has priority 150, address 0006.d74f.6700
Designated bridge has priority 150, address 0006.d74f.6700
Designated port is 14, path cost 0
Timers: message age 3, forward delay 0, hold 0
BPDU: sent 440, received 118
结果如上：一根通一根断
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