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实验拓扑：
实验需求：引入外部路由，运行多个OSPF进程，并且相互之间进行重分发；所有路由器之间都能够相互ping通。
实验步骤：配置路由器的每个端口的IP地址R1:enable conf t int f0/0no shuip add 192.168.12.1 255.255.255.0exitint l 0ip add 10.10.1.1 255.255.255.0 exitR2:
enableconf tint f0/1no shuip add 192.168.12.2 255.255.255.0 exitint l 0ip add 10.10.2.2 255.255.255.0exitint f0/0no shuip add 192.168.23.2 255.255.255.0exitR3：
enable conf t int f 0/1no shuip add 192.168.23.3 255.255.255.0exitint l 0ip add 10.10.3.3 255.255.255.0int f 0/0no shuip add 192.168.34.3 255.255.255.0exitR4:
enableconf tint f0/1no shuip add 192.168.34.4 255.255.255.0exitint l 0ip add 10.10.4.4 255.255.255.0exitint f0/0no shuip add 192.168.45.4 255.255.255.0exitR5:
enableconf tint f0/1no shuip add 192.168.45.5 255.255.255.0exitint l 0ip add 10.10.5.5 255.255.255.0exit在每个路由器开启OSPF并配置OSPF路由
R1:
router os 1router-id 1.1.1.1net 192.168.12.0 0.0.0.255 ar 0net 10.10.1.0 0.0.0.255 ar 0exitR2:
router os 1router-id 2.2.2.2net 192.168.12.0 0.0.0.255 ar 0net 10.10.2.0 0.0.0.255 ar 0net 192.168.23.0 0.0.0.255 ar 0exitR3:
router os 1router-id 3.3.3.3net 192.168.23.0 0.0.0.255 ar 0exitrouter os 1router-id 3.3.3.3net 192.168.34.0 0.0.0.255 ar 12net 10.10.3.0 0.0.0.255 ar 12exitR4:
router os 1router-id 4.4.4.4net 192.168.34.0 0.0.0.255 ar 12exitrouter os 45router-id 6.6.6.6net 192.168.45.0 0.0.0.255 ar 45net 10.10.4.0 0.0.0.255 ar 45exitR5:
router os 45router-id 5.5.5.5net 192.168.45.0 0.0.0.255 ar 45net 10.10.5.0 0.0.0.255 ar 45exit引入外部路由，在R4做重分发（需要做双向）
R4:
router os 1redistribute ospf 45 subnetsexitrouter os 45redistribute ospf 1 subnetsexit转载于:https://blog.51cto.com/13505118/2052287