实验拓扑图
R1路由器的配置
R1#
R1#conf t
Enter configuration commands, one per line. End with CNTL/Z.
R1(config)#int e0/0
R1(config-if)#ip address 192.168.20.1 255.255.255.0
R1(config-if)#no sh
R1(config-if)#int e0/1
R1(config-if)#ip address 192.168.10.1 255.255.255.0
R1(config-if)#no sh
R1(config-if)#int loopback 0
R1(config-if)#ip address 1.1.1.1 255.255.255.255
R1(config-if)#no sh
R1(config-if)#exit
R1(config)#router ospf 1
R1(config-router)#network 192.168.10.0 0.0.0.255 area 0
R1(config-router)#network 192.168.20.0 0.0.0.255 area 0
R1(config-router)#exit
R1(config)#do sh ip int br
Interface IP-Address OK? Method Status Protocol
Ethernet0/0 192.168.20.1 YES manual up up
Ethernet0/1 192.168.10.1 YES manual up up
Ethernet0/2 unassigned YES unset administratively down down
Ethernet0/3 unassigned YES unset administratively down down
Loopback0 1.1.1.1 YES manual up up
R1#sh 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 not set
1.0.0.0/32 is subnetted, 1 subnets
C 1.1.1.1 is directly connected, Loopback0
O 192.168.30.0/24 [110/20] via 192.168.20.2, 00:00:08, Ethernet0/0
C 192.168.10.0/24 is directly connected, Ethernet0/1
O 192.168.40.0/24 [110/30] via 192.168.20.2, 00:00:08, Ethernet0/0
C 192.168.20.0/24 is directly connected, Ethernet0/0
R2路由器的配置
R2#
R2#conf t
Enter configuration commands, one per line. End with CNTL/Z.
R2(config)#int e0/0
R2(config-if)#ip address 192.168.20.2 255.255.255.0
R2(config-if)#no sh
R2(config-if)#int e0/1
R2(config-if)#ip address 192.168.30.1 255.255.255.0
R2(config-if)#no sh
R2(config-if)#int loopback 0
R2(config-if)#ip address 2.2.2.2 255.255.255.255
R2(config-if)#no sh
R2(config-if)#exit
R2(config)# router ospf 1
R2(config-router)#network 192.168.20.0 0.0.0.255 area 0
R2(config-router)#network 192.168.30.0 0.0.0.255 area 0
R2(config-router)#exit
R2(config)#do sh ip int br
Interface IP-Address OK? Method Status Protocol
Ethernet0/0 192.168.20.2 YES manual up up
Ethernet0/1 192.168.30.1 YES manual up up
Ethernet0/2 unassigned YES unset administratively down down
Ethernet0/3 unassigned YES unset administratively down down
Loopback0 2.2.2.2 YES manual up up
R2(config)#do sh 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 not set
2.0.0.0/32 is subnetted, 1 subnets
C 2.2.2.2 is directly connected, Loopback0
C 192.168.30.0/24 is directly connected, Ethernet0/1
O 192.168.10.0/24 [110/20] via 192.168.20.1, 00:04:51, Ethernet0/0
O 192.168.40.0/24 [110/20] via 192.168.30.2, 00:04:51, Ethernet0/1
C 192.168.20.0/24 is directly connected, Ethernet0/0
R3路由器的配置
R3#
R3#conf t
Enter configuration commands, one per line. End with CNTL/Z.
R3(config)#int e0/0
R3(config-if)#ip address 192.168.30.2 255.255.255.0
R3(config-if)#no sh
R3(config-if)#int e0/1
R3(config-if)#ip address 192.168.40.1 255.255.255.0
R3(config-if)#no sh
R3(config-if)#int loopback 0
R3(config-if)#ip address 3.3.3.3 255.255.255.255
R3(config-if)#no sh
R3(config-if)#exit
R3(config)#router ospf 1
R3(config-router)#network 192.168.30.0 0.0.0.255 area 0
R3(config-router)#network 192.168.40.0 0.0.0.255 area 0
R3(config)#do sh 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 not set
3.0.0.0/32 is subnetted, 1 subnets
C 3.3.3.3 is directly connected, Loopback0
C 192.168.30.0/24 is directly connected, Ethernet0/0
O 192.168.10.0/24 [110/30] via 192.168.30.1, 00:08:32, Ethernet0/0
C 192.168.40.0/24 is directly connected, Ethernet0/1
O 192.168.20.0/24 [110/20] via 192.168.30.1, 00:08:32, Ethernet0/0
R3(config)#
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最后验证成功