ospf的虚拟链路

Ip add 12.0.0.1 255.255.255.0 No sh Int lo0

Ip add 1.1.1.1 255.255.255.0 Router ospf 1

Net 12.0.0.0 0.0.0.255 a 0 Net 1.1.1.1 0.0.0.0 a 0 R2 En Conf t Int s0/0

Ip add 12.0.0.2 255.255.255.0 No sh

Int s0/1

Ip add 23.0.0.2 255.255.255.0 No sh Int lo0

Ip add 2.2.2.2 255.255.255.0 Router ospf 1

Net 12.0.0.0 0.0.0.255 a 0 Net 2.2.2.2 0.0.0.0 a 0 Net 23.0.0.0 0.0.0.255 a 1 R3

En

Conf t Int s0/1

Ip add 23.0.0.2 255.255.255.0 No sh Int s0/0

Ip add 34.0.0.3 255.255.255.0 No sh Int lo0

Ip add 3.3.3.3 255.255.255.0 Router ospf 1

Net 23.0.0.0 0.0.0.255 a 1 Net 34.0.0.0 0.0.0.255 a 0 Net 3.3.3.3 0.0.0.0 a 1 R4 En Conf t Int s0/0

Ip add 34.0.0.4 255.255.255.0 No sh Int lo0

Ip add 4.4.4.4 255.255.255.0 Router ospf 1

Net 34.0.0.0 0.0.0.255 a 0 Net 4.4.4.4 0.0.0.0 a 0

实验结果

R2#sh ip ospf vir

Virtual Link OSPF_VL0 to router 3.3.3.3 is up Run as demand circuit DoNotAge LSA allowed.

Transit area 1, via interface Serial0/1, Cost of using

Transmit Delay is 1 sec, State POINT_TO_POINT,

Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5 Hello due in 00:00:01

Adjacency State FULL (Hello suppressed)

Index 2/3, retransmission queue length 0, number of retransmission 0 First 0x0(0)/0x0(0) Next 0x0(0)/0x0(0)

Last retransmission scan length is 0, maximum is 0

Last retransmission scan time is 0 msec, maximum is 0 msec

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

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

34.0.0.0/24 is subnetted, 1 subnets

O 34.0.0.0 [110/192] via 12.0.0.2, 00:07:55, Serial0/0 1.0.0.0/24 is subnetted, 1 subnets

C 1.1.1.0 is directly connected, Loopback0 2.0.0.0/32 is subnetted, 1 subnets

O 2.2.2.2 [110/65] via 12.0.0.2, 00:07:55, Serial0/0 3.0.0.0/32 is subnetted, 1 subnets

O IA 3.3.3.3 [110/129] via 12.0.0.2, 00:07:55, Serial0/0 4.0.0.0/32 is subnetted, 1 subnets

O 4.4.4.4 [110/193] via 12.0.0.2, 00:07:55, Serial0/0 23.0.0.0/24 is subnetted, 1 subnets

O IA 23.0.0.0 [110/128] via 12.0.0.2, 00:07:57, Serial0/0 12.0.0.0/24 is subnetted, 1 subnets C 12.0.0.0 is directly connected, Serial0/0

R4#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

34.0.0.0/24 is subnetted, 1 subnets

C 34.0.0.0 is directly connected, Serial0/0 1.0.0.0/32 is subnetted, 1 subnets

O 1.1.1.1 [110/193] via 34.0.0.3, 00:10:22, Serial0/0 2.0.0.0/32 is subnetted, 1 subnets

O 2.2.2.2 [110/129] via 34.0.0.3, 00:10:22, Serial0/0 3.0.0.0/32 is subnetted, 1 subnets

O IA 3.3.3.3 [110/65] via 34.0.0.3, 00:10:22, Serial0/0 4.0.0.0/24 is subnetted, 1 subnets

C 4.4.4.0 is directly connected, Loopback0 23.0.0.0/24 is subnetted, 1 subnets

O IA 23.0.0.0 [110/128] via 34.0.0.3, 00:10:23, Serial0/0 12.0.0.0/24 is subnetted, 1 subnets

O 12.0.0.0 [110/192] via 34.0.0.3, 00:10:25, Serial0/0