如下图示:
- R1:
- interface Loopback0
- ip address 1.1.1.1 255.255.255.255
- interface FastEthernet1/0
- ip address 12.1.1.1 255.255.255.0
- no sh
- router ospf 1
- router-id 1.1.1.1
- network 1.1.1.1 0.0.0.0 area 0
- network 12.1.1.0 0.0.0.255 area 0
- R2:
- interface Loopback0
- ip address 2.2.2.2 255.255.255.255
- interface FastEthernet0/0
- ip address 23.1.1.2 255.255.255.0
- no sh
- interface FastEthernet0/1
- ip address 24.1.1.2 255.255.255.0
- no sh
- interface FastEthernet1/0
- ip address 12.1.1.2 255.255.255.0
- no sh
- router ospf 1
- area 1 stub
- network 2.2.2.2 0.0.0.0 area 0
- network 12.1.1.0 0.0.0.255 area 0
- network 23.1.1.0 0.0.0.255 area 1
- network 24.1.1.0 0.0.0.255 area 1
- R3:
- interface Loopback0
- ip address 3.3.3.3 255.255.255.255
- interface FastEthernet0/0
- ip address 23.1.1.3 255.255.255.0
- no sh
- router ospf 1
- router-id 3.3.3.3
- area 1 stub
- network 3.3.3.3 0.0.0.0 area 1
- network 23.1.1.0 0.0.0.255 area 1
- R4:
- interface Loopback0
- ip address 4.4.4.4 255.255.255.255
- interface FastEthernet0/1
- ip address 24.1.1.4 255.255.255.0
- no sh
- router ospf 1
- router-id 4.4.4.4
- area 1 stub
- network 4.4.4.4 0.0.0.0 area 1
- network 24.1.1.0 0.0.0.255 area 1
- R1(config-router)#do 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 not set
- 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 [110/2] via 12.1.1.2, 00:30:41, FastEthernet1/0
- 3.0.0.0/32 is subnetted, 1 subnets
- O IA 3.3.3.3 [110/12] via 12.1.1.2, 00:22:52, FastEthernet1/0
- 4.0.0.0/32 is subnetted, 1 subnets
- O IA 4.4.4.4 [110/12] via 12.1.1.2, 00:25:54, FastEthernet1/0
- 23.0.0.0/24 is subnetted, 1 subnets
- O IA 23.1.1.0 [110/11] via 12.1.1.2, 00:30:38, FastEthernet1/0
- 24.0.0.0/24 is subnetted, 1 subnets
- O IA 24.1.1.0 [110/11] via 12.1.1.2, 00:30:29, FastEthernet1/0
- 12.0.0.0/24 is subnetted, 1 subnets
- C 12.1.1.0 is directly connected, FastEthernet1/0
- R4(config-router)# do 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 24.1.1.2 to network 0.0.0.0
- 1.0.0.0/32 is subnetted, 1 subnets
- O IA 1.1.1.1 [110/12] via 24.1.1.2, 00:23:29, FastEthernet0/1
- 2.0.0.0/32 is subnetted, 1 subnets
- O IA 2.2.2.2 [110/11] via 24.1.1.2, 00:23:29, FastEthernet0/1
- 3.0.0.0/32 is subnetted, 1 subnets
- O 3.3.3.3 [110/21] via 24.1.1.2, 00:23:29, FastEthernet0/1
- 4.0.0.0/32 is subnetted, 1 subnets
- C 4.4.4.4 is directly connected, Loopback0
- 23.0.0.0/24 is subnetted, 1 subnets
- O 23.1.1.0 [110/20] via 24.1.1.2, 00:23:31, FastEthernet0/1
- 24.0.0.0/24 is subnetted, 1 subnets
- C 24.1.1.0 is directly connected, FastEthernet0/1
- 12.0.0.0/24 is subnetted, 1 subnets
- O IA 12.1.1.0 [110/11] via 24.1.1.2, 00:23:31, FastEthernet0/1
- O*IA 0.0.0.0/0 [110/11] via 24.1.1.2, 00:23:31, FastEthernet0/1
- R4(config-router)#do ping 1.1.1.1
- Type escape sequence to abort.
- Sending 5, 100-byte ICMP Echos to 1.1.1.1, timeout is 2 seconds:
- !!!!!
- Success rate is 100 percent (5/5), round-trip min/avg/max = 24/36/52 ms
- R1(config-router)#do ping 4.4.4.4
- Type escape sequence to abort.
- Sending 5, 100-byte ICMP Echos to 4.4.4.4, timeout is 2 seconds:
- !!!!!
- Success rate is 100 percent (5/5), round-trip min/avg/max = 20/32/40 ms
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