在CISCO 3550上配置fallback bridging 
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配置fallback bridge.。交换机的f0/1启用三层端口并连接到R1。F0/3和f0/4划分到VLAN 6中并分别连R3和R4。
SWITCH
conf t ip routing bridge 1 protocol vlan-bridge /*创建一个bridge group no bridge 1 acquire /*启用交换机停止转发到动态学习到的MAC地址的帧，仅仅转发到静态配置的MAC地址的帧。 int f 0/1 no switchport ip ad 10.10.10.7 255.255.255.0 no shut bridge-group 1 /*把f0/1加入到group 1中 exit vlan 6 exit int range f 0/3 -4 switchport mode access switchport access vlan 6 exit int vlan 6 ip ad 10.10.11.7 255.255.255.0 bridge-group 1 /*把interface vlan 6加入到group1中 exit bridge 1 aging-time 100 /*设置age time为100s, default 300s bridge 1 hello-time 3 /*设置hello time 为3s, defautl:2 bridge 1 max-age 150 /*设置max time 为150 s , default 30 bridge 1 forward-time 50 /*设置forward time 为50s，default: 20 bridge 1 address 0000.9614.53e0 forward f0/1 /*静态配置转发缓存 int ff0/2
bridge 1 priority 100 /*设置group的优先级
校验
sw1#sh span
Bridge group 1 Spanning tree enabled protocol vlan-bridge Root ID Priority 100 Address 0013.1ab4.fe00 This bridge is the root Hello Time 3 sec Max Age 150 sec Forward Delay 50 sec Bridge ID Priority 100 Address 0013.1ab4.fe00 Hello Time 3 sec Max Age 150 sec Forward Delay 50 sec Aging Time 100 Interface Role Sts Cost Prio.Nbr Type ---------------- ---- --- --------- -------- -------------------------------- Fa0/1 Desg FWD 500 32.35 P2p Vl6 Desg FWD 4 128.36 P2p sw1#sh bridge 1 Br Group Mac Address State Type Ports -------- ----------- ----- ---- ----- 1 0000.9614.53e0 Forward STATIC Fa0/1 show bridge 1下面还有一些条目，因为使用了no bridge 1 acquire命令，状态被置为discard。这里就不再贴上了
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