网络拓扑
说明：要实现整个网络的通信，在现实当中需要在R1上做NAT来实现与ISP的通信，本案例省略NAT的配置，在ISP路由器上配置默认路由来实现通信，而且需要在R2和R3上配置OSPF（RIP）重分发和静态路由和直连路由的重分发，从而实现全网的互通，具体的配置如下：
（1）配置各路由器，以及OSPF协议、RIP协议、静态路由、接口IP地址
R1的配置如下：
接口地址
R1#conf t
R1(config)#int lo0
R1(config-if)#ip add 1.1.1.1 255.255.255.255
R1(config-if)#no sh
R1(config-if)#exit
R1(config)#int e0/0
R1(config-if)#ip add 10.0.0.5 255.255.255.252
R1(config-if)#no sh
R1(config-if)#exit
R1(config)#int e0/1
R1(config-if)#ip add 172.16.31.1 255.255.255.252
R1(config-if)#no sh
R1(config-if)#exit
R1(config)#int e0/2
R1(config-if)#ip add 192.168.1.1 255.255.255.0
R1(config-if)#no sh
R1(config-if)#exit
R1(config)#int e0/3
R1(config-if)#ip add 10.0.0.1 255.255.255.252
R1(config-if)#no sh
R1(config-if)#exit
OSPF协议
R1(config)#router ospf 1
R1(config-router)#router-id 1.1.1.1
R1(config-router)#network 1.1.1.1 0.0.0.0 area 0
R1(config-router)#network 10.0.0.0 0.0.0.3 area 0
R1(config-router)#network 10.0.0.4 0.0.0.3 area 1
R1(config-router)#network 192.168.1.0 0.0.0.255 area 0
R1(config-router)#exit
默认路由
R1(config)#ip route 0.0.0.0 0.0.0.0 172.16.31.2
R2的配置如下：
接口地址
R2#conf t
R2(config)#int lo0
R2(config-if)#ip add 2.2.2.2 255.255.255.255
R2(config-if)#no sh
R2(config-if)#exit
R2(config)#int e0/0
R2(config-if)#ip add 10.0.0.2 255.255.255.252
R2(config-if)#no sh
R2(config-if)#exit
R2(config)#int e0/1
R2(config-if)#ip add 192.168.100.1 255.255.255.0
R2(config-if)#no sh
R2(config-if)#exit
OSPF协议
R2(config)#router ospf 1
R2(config-router)#router-id 2.2.2.2
R2(config-router)#network 2.2.2.2 0.0.0.0 area 0
R2(config-router)#network 10.0.0.0 0.0.0.3 area 0
R2(config-router)#exit
RIP协议
R2(config)#router rip
R2(config-router)#version 2
R2(config-router)#network 192.168.100.0
R2(config-router)#exit
R3的配置如下：
接口地址
R3#conf t
R3(config)#int lo0
R3(config-if)#ip add 3.3.3.3 255.255.255.255
R3(config-if)#no sh
R3(config-if)#exit
R3(config)#int e0/0
R3(config-if)#ip add 10.0.0.6 255.255.255.252
R3(config-if)#no sh
R3(config-if)#exit
R3(config)#int e0/1
R3(config-if)#ip add 10.0.0.9 255.255.255.252
R3(config-if)#no sh
R3(config-if)#exit
OSPF协议
R3(config)#router ospf 1
R3(config-router)#router-id 3.3.3.3
R3(config-router)#network 3.3.3.3 0.0.0.0 area 1
R3(config-router)#network 10.0.0.4 0.0.0.3 area 1
R3(config-router)#exit
静态路由
R3(config)#ip route 192.168.3.0 255.255.255.0 10.0.0.10
R4的配置如下：
接口地址
R4#conf t
R4(config)#int lo0
R4(config-if)#ip add 4.4.4.4 255.255.255.255
R4(config-if)#no sh
R4(config-if)#exit
R4(config)#int e0/0
R4(config-if)#ip add 192.168.3.1 255.255.255.0
R4(config-if)#no sh
R4(config-if)#exit
R4(config)#int e0/1
R4(config-if)#ip add 10.0.0.10 255.255.255.252
R4(config-if)#no sh
R4(config-if)#exit
默认路由
R4(config)#ip route 0.0.0.0 0.0.0.0 10.0.0.9
R5的配置如下：
接口地址
R5#conf t
R5(config)#int e0/0
R5(config-if)#ip add 192.168.2.1 255.255.255.0
R5(config-if)#no sh
R5(config-if)#int e0/1
R5(config-if)#ip add 192.168.100.2 255.255.255.0
R5(config-if)#no sh
R5(config-if)#exit
RIP协议
R5(config)#router rip
R5(config-router)#version 2
R5(config-router)#network 192.168.100.0
R5(config-router)#network 192.168.2.0
R5(config-router)#exit
ISP的配置如下：
接口地址
ISP#conf t
ISP(config)#int e0/0
ISP(config-if)#ip add 59.56.61.1 255.255.255.0
ISP(config-if)#no sh
ISP(config-if)#exit
ISP(config)#int e0/1
ISP(config-if)#ip add 172.16.31.2 255.255.255.252
ISP(config-if)#no sh
ISP(config-if)#exit
默认路由
ISP(config)#ip route 0.0.0.0 0.0.0.0 172.16.31.1
（2）配置路由重分发
在R1上重分发默认路由，配置如下：
R1(config)#router ospf 1
R1(config-router)#default-information originate
R1(config-router)#exit
在R2重分发OSPF和RIP，配置如下：
R2(config)#router ospf 1
R2(config-router)#redistribute rip subnets
R2(config-router)#exit
R2(config)#router rip
R2(config-router)#redistribute ospf 1 metric 3
R2(config-router)#exit
在R3上重分发静态路由和直连路由，配置如下：
R3(config)#router ospf 1
R3(config-router)#redistribute static subnets
R3(config-router)#redistribute connected subnets
R3(config-router)#exit
（3）验证网络通信是否正常
查看R1、R2、R3、R5的路由表，并使用ping命令验证网络是否正常通信
R1的路由表：
R1#show ip route
Codes: C - connected, S - static, 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
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is 172.16.31.2 to network 0.0.0.0
1.0.0.0/32 is subnetted, 1 subnets
C 1.1.1.1 is directly connected, Loopback0
2.0.0.0/32 is subnetted, 1 subnets
O 2.2.2.2 [110/11] via 10.0.0.2, 02:41:47, Ethernet0/3
3.0.0.0/32 is subnetted, 1 subnets
O 3.3.3.3 [110/11] via 10.0.0.6, 02:39:45, Ethernet0/0
172.16.0.0/30 is subnetted, 1 subnets
C 172.16.31.0 is directly connected, Ethernet0/1
10.0.0.0/30 is subnetted, 3 subnets
O E2 10.0.0.8 [110/20] via 10.0.0.6, 02:39:39, Ethernet0/0
C 10.0.0.0 is directly connected, Ethernet0/3
C 10.0.0.4 is directly connected, Ethernet0/0
C 192.168.1.0/24 is directly connected, Ethernet0/2
O E2 192.168.2.0/24 [110/20] via 10.0.0.2, 02:40:07, Ethernet0/3
O E2 192.168.100.0/24 [110/20] via 10.0.0.2, 02:40:07, Ethernet0/3
O E2 192.168.3.0/24 [110/20] via 10.0.0.6, 02:40:07, Ethernet0/0
S* 0.0.0.0/0 [1/0] via 172.16.31.2（默认路由重分发）
R2的路由表：
R2#show ip route
Codes: C - connected, S - static, 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
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is 10.0.0.1 to network 0.0.0.0
1.0.0.0/32 is subnetted, 1 subnets
O 1.1.1.1 [110/11] via 10.0.0.1, 02:42:10, Ethernet0/0
2.0.0.0/32 is subnetted, 1 subnets
C 2.2.2.2 is directly connected, Loopback0
3.0.0.0/32 is subnetted, 1 subnets
O IA 3.3.3.3 [110/21] via 10.0.0.1, 02:42:10, Ethernet0/0
10.0.0.0/30 is subnetted, 3 subnets
O E2 10.0.0.8 [110/20] via 10.0.0.1, 02:40:00, Ethernet0/0
C 10.0.0.0 is directly connected, Ethernet0/0
O IA 10.0.0.4 [110/20] via 10.0.0.1, 02:42:12, Ethernet0/0
O 192.168.1.0/24 [110/20] via 10.0.0.1, 02:42:12, Ethernet0/0
R 192.168.2.0/24 [120/1] via 192.168.100.2, 00:00:14, Ethernet0/1
C 192.168.100.0/24 is directly connected, Ethernet0/1
O E2 192.168.3.0/24 [110/20] via 10.0.0.1, 02:40:06, Ethernet0/0
O*E2 0.0.0.0/0 [110/1] via 10.0.0.1, 02:40:06, Ethernet0/0（RIP的重分发）
R3的路由表：
R3#show ip route
Codes: C - connected, S - static, 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
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is 10.0.0.5 to network 0.0.0.0
1.0.0.0/32 is subnetted, 1 subnets
O IA 1.1.1.1 [110/11] via 10.0.0.5, 02:41:33, Ethernet0/0
2.0.0.0/32 is subnetted, 1 subnets
O IA 2.2.2.2 [110/21] via 10.0.0.5, 02:41:33, Ethernet0/0
3.0.0.0/32 is subnetted, 1 subnets
C 3.3.3.3 is directly connected, Loopback0
10.0.0.0/30 is subnetted, 3 subnets
C 10.0.0.8 is directly connected, Ethernet0/1
O IA 10.0.0.0 [110/20] via 10.0.0.5, 02:41:33, Ethernet0/0
C 10.0.0.4 is directly connected, Ethernet0/0
O IA 192.168.1.0/24 [110/20] via 10.0.0.5, 02:41:35, Ethernet0/0
O E2 192.168.2.0/24 [110/20] via 10.0.0.5, 02:41:35, Ethernet0/0
O E2 192.168.100.0/24 [110/20] via 10.0.0.5, 02:41:35, Ethernet0/0
S 192.168.3.0/24 [1/0] via 10.0.0.10
O*E2 0.0.0.0/0 [110/1] via 10.0.0.5, 02:41:36, Ethernet0/0（静态路由和直连路由的重分发）
R5的路由表：
R5#show ip route
Codes: C - connected, S - static, 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
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is 192.168.100.1 to network 0.0.0.0
R 1.0.0.0/8 [120/3] via 192.168.100.1, 00:00:17, Ethernet0/1
R 2.0.0.0/8 [120/3] via 192.168.100.1, 00:00:17, Ethernet0/1
R 3.0.0.0/8 [120/3] via 192.168.100.1, 00:00:17, Ethernet0/1
R 10.0.0.0/8 [120/3] via 192.168.100.1, 00:00:17, Ethernet0/1
R 192.168.1.0/24 [120/3] via 192.168.100.1, 00:00:17, Ethernet0/1
C 192.168.2.0/24 is directly connected, Ethernet0/0
C 192.168.100.0/24 is directly connected, Ethernet0/1
R 192.168.3.0/24 [120/3] via 192.168.100.1, 00:00:19, Ethernet0/1
R* 0.0.0.0/0 [120/3] via 192.168.100.1, 00:00:19, Ethernet0/1（OSPF的重分发）
在R4上pingISP和R5
R4#ping 59.56.61.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 59.56.61.1, timeout is 2 seconds:
!!!!!（能够正常通信）
Success rate is 100 percent (5/5), round-trip min/avg/max = 84/99/120 ms
R4#ping 192.168.2.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.2.1, timeout is 2 seconds:
!!!!!（能够正常通信）
Success rate is 100 percent (5/5), round-trip min/avg/max = 124/132/152 ms