拓扑如上
要求，全网互通，在R4上查看路由显示R5为域内路由。
配置如下：
首先，在SW1 ，SW2上划分VLAN并且把各个接口划分到VLAN下去。
SW1上配置如下：
RACK171SW1#vlan da
RACK171SW1(vlan)#vlan 34 name vlan34
RACK171SW1(vlan)#vlan 55 name vlan55
RACK171SW1(vlan)#exit
RACK171SW1(config)#int range f0/3 , f0/4
RACK171SW1(config-if-range)#sw ac vl 34
RACK171SW1(config-if-range)#int f0/5
RACK171SW1(config-if)#sw ac vl 55
RACK171SW1(config-if)#^Z
SW2上配置如下：
RACK171SW2#vlan da
RACK171SW2(vlan)#vlan 25 name vlan25
RACK171SW2(vlan)#exit
RACK171SW2(config)#int range f0/2 , f0/5
RACK171SW2(config-if-range)#sw ac vl 25
RACK171SW2(config-if-range)#no sh
RACK171SW2(config-if-range)#^Z
再分配各路由的各个接口IP地址，做帧中继，DHLC映射，保证直连互通。
R1上配置如下：
RACK171R1(config)#int lo0
RACK171R1(config-if)#ip add 123.123.1.1 255.255.255.0
RACK171R1(config-if)#int s2/0
RACK171R1(config-if)#ip add 123.123.123.1 255.255.255.0
RACK171R1(config-if)#no sh
RACK171R1(config-if)#en fr
RACK171R1(config-if)#no frame inver
RACK171R1(config-if)#fr map ip 123.123.123.2 102 b
RACK171R1(config-if)#fr map ip 123.123.123.3 103 b
RACK171R1(config-if)#fr map ip 123.123.123.1 102 b
RACK171R1(config-if)#int s3/0
RACK171R1(config-if)#ip add 14.14.14.1 255.255.255.0
RACK171R1(config-if)#no sh
RACK171R1(config-if)#en fr
RACK171R1(config-if)#no frame inver
RACK171R1(config-if)#fr map ip 14.14.14.4 114 b
RACK171R1(config-if)#ip ospf net point-to-p
R2上配置如下：
RACK171R2(config)#int lo0
RACK171R2(config-if)#ip add 123.123.2.2 255.255.255.0
RACK171R2(config-if)#int s2/0
RACK171R2(config-if)#ip add 123.123.123.2 255.255.255.0
RACK171R2(config-if)#no sh
RACK171R2(config-if)#en fr
RACK171R2(config-if)#no frame inver
RACK171R2(config-if)#fr map ip 123.123.123.1 201 b
RACK171R2(config-if)#fr map ip 123.123.123.3 201 b
RACK171R2(config-if)#ip ospf pri 0
RACK171R2(config-if)#int f1/0
RACK171R2(config-if)#ip add 25.25.25.2 255.255.255.0
RACK171R2(config-if)#no sh
RACK171R2(config-if)#full
RACK171R2(config-if)#^Z
R3上配置如下：
RACK171R3(config)#int lo0
RACK171R3(config-if)#ip add 123.123.3.3 255.255.255.0
RACK171R3(config-if)#int s2/0
RACK171R3(config-if)#ip add 123.123.123.3 255.255.255.0
RACK171R3(config-if)#no sh
RACK171R3(config-if)#en fr
RACK171R3(config-if)#no frame inver
RACK171R3(config-if)# fr map ip 123.123.123.1 301 b
RACK171R3(config-if)#fr map ip 123.123.123.2 301 b
RACK171R3(config-if)#ip ospf pri 0
RACK171R3(config-if)#int f0/0
RACK171R3(config-if)#ip add 34.34.34.3 255.255.255.0
RACK171R3(config-if)#no sh
RACK171R3(config-if)#full
RACK171R3(config-if)#^Z
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