[BCMSN]试验8 配置生成树协议（缺省行为）

SW1

sw1(config)#int range f0/11 �C 12
sw1(config-if-range)#no sh
sw1(config-if-range)#sw mo tr
sw1(config-if-range)#^Z

SW2

sw2(config)#int range f0/11 �C 12
sw2(config-if-range)#no sh
sw2(config-if-range)#sw mo tr
sw2(config-if-range)#^Z

在SW1上查看生成树

sw1#sh spanning-tree

VLAN1 is executing the ieee compatible Spanning Tree protocol
  Bridge Identifier has priority 32768, address ccd1.4bb8.0000
  Configured hello time 2, max age 20, forward delay 15
  We are the root of the spanning tree
  Topology change flag set, detected flag set
  Number of topology changes 1 last change occurred 00:00:21 ago
          from FastEthernet0/11
  Times:  hold 1, topology change 35, notification 2
          hello 2, max age 20, forward delay 15
  Timers: hello 0, topology change 21, notification 0, aging 0

Port 12 (FastEthernet0/11) of VLAN1 is forwarding
   Port path cost 19, Port priority 128, Port Identifier 128.12.
   Designated root has priority 32768, address ccd1.4bb8.0000
   Designated bridge has priority 32768, address ccd1.4bb8.0000
   Designated port id is 128.12, designated path cost 0
   Timers: message age 0, forward delay 0, hold 0
   Number of transitions to forwarding state: 1
   BPDU: sent 55, received 5

Port 13 (FastEthernet0/12) of VLAN1 is forwarding
   Port path cost 19, Port priority 128, Port Identifier 128.13.
   Designated root has priority 32768, address ccd1.4bb8.0000
   Designated bridge has priority 32768, address ccd1.4bb8.0000
   Designated port id is 128.13, designated path cost 0
   Timers: message age 0, forward delay 0, hold 0
   Number of transitions to forwarding state: 1
   BPDU: sent 55, received 6

 

Port12和Port13都为转发模式

在SW2上查看生成树

sw2#sh spanning-tree

VLAN1 is executing the ieee compatible Spanning Tree protocol
  Bridge Identifier has priority 32768, address ccd2.977c.0000
  Configured hello time 2, max age 20, forward delay 15
  Current root has priority 32768, address ccd1.4bb8.0000
  Root port is 12 (FastEthernet0/11), cost of root path is 19
  Topology change flag set, detected flag not set
  Number of topology changes 1 last change occurred 00:00:40 ago
  Times:  hold 1, topology change 35, notification 2
          hello 2, max age 20, forward delay 15
  Timers: hello 0, topology change 0, notification 0, aging 0

Port 12 (FastEthernet0/11) of VLAN1 is forwarding
   Port path cost 19, Port priority 128, Port Identifier 128.12.
   Designated root has priority 32768, address ccd1.4bb8.0000
   Designated bridge has priority 32768, address ccd1.4bb8.0000
   Designated port id is 128.12, designated path cost 0
   Timers: message age 1, forward delay 0, hold 0
   Number of transitions to forwarding state: 1
   BPDU: sent 1, received 18

Port 13 (FastEthernet0/12) of VLAN1 is blocking
   Port path cost 19, Port priority 128, Port Identifier 128.13.
   Designated root has priority 32768, address ccd1.4bb8.0000
   Designated bridge has priority 32768, address ccd1.4bb8.0000
   Designated port id is 128.13, designated path cost 0
   Timers: message age 10, forward delay 0, hold 0
   Number of transitions to forwarding state: 0
   BPDU: sent 4, received 2

 

Port12为转发模式  Port13为阻塞模式