选用设备： R2, PC2，R3, PC3
配置清单：基本配置请参考静态路由配置。
R2
R2(config-if)#interface e0
R2(config-if)#ip address 192.168.2.1 255.255.255.0
R2(config-if)#no shutdown
R2(config-if)#interface S0
R2(config-if)#clock rate 64000
R2(config-if)#ip address 202.103.24.1 255.255.255.0
R2(config-if)#no shutdown
R2(config-if)#interface e1
R2(config-if)#ip address 172.15.1.1 255.255.0.0
R2(config-if)#no shutdown
R2(config)#router rip
R2(config–router)#network 192.168.2.0
R2(config–router)#network 202.103.24.0
R2(config–router)#network 172.15.0.0
R2(config)#interface s0
R2(config–if)#backup interface e1 指定s0的备份接口是e1
R2(config–if)#backup delay 5 10 当s0状态为down并有5秒钟后自动启动e1，当s0恢复up状态20秒后e1自动断开。
R2(config–if)#backup load 20 10 当链路负载超过20%时，启用备份链路E1
当负载小于10%后断开E1.
R3
R3(config)#interface s1
R3(config-if)#ip address 202.103.24.2 255.255.255.0
R3(config-if)#clock rate 64000
R3(config-if)#no shutdown
R3(config-if)#interface e0
R3(config-if)#ip address 192.168.3.1 255.255.255.0
R3(config-if)#no shutdown
R3(config-if)#interface e1
R3(config-if)#ip address 172.15.1.2 255.255.255.0
R3(config-if)#no shutdown
R3(config)#router rip
R3(config–router)#network 192.168.3.0
R3(config–router)#network 202.103.24.0
R3(config–router)#network 172.15.0.0
R3(config)#interface s1
R2(config–if)#backup interface e1
R2(config–if)#backup delay 5 10
R2(config–if)#backup load 20 10
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