1.预配置

r1(config-if)#int s1/2

r1(config-if)#ip ad 12.1.1.1 255.255.255.0

r1(config-if)#no sh

r1(config-if)#int lo0

r1(config-if)#ip ad 1.1.1.1 255.255.255.0

r1(config-if)#int s1/3

r1(config-if)#ip ad 13.1.1.1 255.255.255.0

r1(config-if)#no sh

r1(config-if)#router rip

r1(config-router)#net 1.1.1.0

r1(config-router)#net 12.1.1.0

r1(config-router)#no auto-summary

r1(config-router)#ver 2

不把13.1.1.0/24 的网段宣告进来，为了做静态路由。

r1(config)#ip route 3.3.3.0 255.255.255.0 13.1.1.3 150 设静态路由的管理距离为150

r2(config)#int s2/1

r2(config-if)#ip ad 12.1.1.2 255.255.255.0

r2(config-if)#no sh

r2(config-if)#int s2/3

r2(config-if)#ip ad 23.1.1.2 225.255.255.0

r2(config-if)#no sh

r2(config-if)#

r2(config-if)#router rip

r2(config-router)#net 12.1.1.0

r2(config-router)#net 23.1.1.0

r2(config-router)#no au

r2(config-router)#ver 2

r3(config)#int s3/2

r3(config-if)#ip ad 23.1.1.3 255.255.255.0

r3(config-if)#no sh

r3(config-if)#int s3/1

r3(config-if)#ip ad 13.1.1.3 255.255.255.0

r3(config-if)#no sh

r3(config-if)#router rip

r3(config-router)#net 3.3.3.0

r3(config-router)#net 23.1.1.0

r3(config-router)#no au

r3(config-router)#ver 2

不把13.1.1.0/24 的网段宣告进来，为了做静态路由。

r3(config)#ip route 1.1.1.0 255.255.255.0 13.1.1.1 150

2.查看

r1#sho ip route

Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP

       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

       E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP

       i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate default

       U - per-user static route, o - ODR

Gateway of last resort is not set

     1.0.0.0/24 is subnetted, 1 subnets

C       1.1.1.0 is directly connected, Loopback0

     3.0.0.0/24 is subnetted, 1 subnets     可以看到用RIP学到路由3.3.3.0/24,因为RIP的管理距离是120，小于静态路由的管理距离150，所以静态路由出于备份的地位。

R       3.3.3.0/24 is possibly down,

          routing via 12.1.1.2, Serial1/2

     13.0.0.0/24 is subnetted, 1 subnets

C       13.1.1.0 is directly connected, Serial1/3

     23.0.0.0/24 is subnetted, 1 subnets

R       23.1.1.0/24 is possibly down,

          routing via 12.1.1.2, Serial1/2

3.把S1/2 关闭，再看路由表

r1#sho ip route

Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP

       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

       E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP

       i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate default

       U - per-user static route, o - ODR

Gateway of last resort is not set

     1.0.0.0/24 is subnetted, 1 subnets

C       1.1.1.0 is directly connected, Loopback0

     3.0.0.0/24 is subnetted, 1 subnets

S       3.3.3.0 [150/0] via 13.1.1.3通过静态路由学到3.3.3.0/24的网络

     13.0.0.0/24 is subnetted, 1 subnets

C       13.1.1.0 is directly connected, Serial1/3

4.把S1/2打开看路由表

r1#sho ip route

Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP

       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

       E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP

       i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate default

       U - per-user static route, o - ODR

Gateway of last resort is not set

     1.0.0.0/24 is subnetted, 1 subnets

C       1.1.1.0 is directly connected, Loopback0

     3.0.0.0/24 is subnetted, 1 subnets

R       3.3.3.0 [120/2] via 12.1.1.2, 00:00:10, Serial1/2

     12.0.0.0/24 is subnetted, 1 subnets

C       12.1.1.0 is directly connected, Serial1/2

     13.0.0.0/24 is subnetted, 1 subnets

C       13.1.1.0 is directly connected, Serial1/3

     23.0.0.0/24 is subnetted, 1 subnets

R       23.1.1.0 [120/1] via 12.1.1.2, 00:00:10, Serial1/2

     现在可以见到静态路由又处于备份的地位。

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