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OSPF虚链路(virtual-link)配置实例

这个设置设置设备摆设摆设将验证一个OSPF虚电路(Virtual-Link)的历程,重点在察看虚链路连接的临时收集与正常区域间路由有何差别。上图中区域4(area 4)没有和area 0直接相连。在R2与R3之间设置设置设备摆设摆设了一条虚链路。

// R1 //

int lo0

ip ad 1.1.1.1 255.255.255.0

int e0

ip ad 192.1.1.1 255.255.255.0

router os 1

network 192.1.1.0 0.0.0.255 area 0

// R2 //

int lo0

ip ad 2.2.2.2 255.255.255.0

int e0

ip ad 192.1.1.2 255.255.255.0

int e1

ip ad 193.1.1.2 255.255.255.0

router os 1

network 192.1.1.0 0.0.0.255 area 0

network 193.1.1.0 0.0.0.255 area 1

// R3 //

int lo0

ip ad 3.3.3.3 255.255.255.0

int e1

ip ad 193.1.1.3 255.255.255.0

int e0

ip ad 194.1.1.3 255.255.255.0

router os 1

network 193.1.1.0 0.0.0.255 area 1

network 194.1.1.0 0.0.0.255 area 4

// R4 //

int lo0

ip ad 4.4.4.4 255.255.255.0

int e0

ip ad 194.1.1.4 255.255.255.0

router os 1

network 194.1.1.0 0.0.0.255 area 4

基础设置设置设备摆设摆设完成后,我们在每台路由器上分手来验证一下:

r1#sh ip os nei

Neighbor ID Pri State Dead Time Address Interface

2.2.2.2 1 FULL/BDR 00:00:33 192.1.1.2 Ethernet0/0

r1#

r1#sh ip ro

1.0.0.0/24 is subnetted, 1 subnets

C 1.1.1.0 is directly connected, Loopback0

O IA 193.1.1.0/24 [110/20] via 192.1.1.2, 00:00:19, Ethernet0/0

C 192.1.1.0/24 is directly connected, Ethernet0/0

//留意R1上有关于193.1.1.0的路由条款,是属于IA类型(域间路由)

r2#sh ip os nei

Neighbor ID Pri State Dead Time Address Interface

1.1.1.1 1 FULL/DR 00:00:35 192.1.1.1 Ethernet0/0

3.3.3.3 1 FULL/BDR 00:00:35 193.1.1.3 Ethernet1/0

r2#

r2#

r2#sh ip ro

2.0.0.0/24 is subnetted, 1 subnets

C 2.2.2.0 is directly connected, Loopback0

C 193.1.1.0/24 is directly connected, Ethernet1/0

C 192.1.1.0/24 is directly connected, Ethernet0/0

r3#sh ip os nei

Neighbor ID Pri State Dead Time Address Interface

2.2.2.2 1 FULL/DR 00:00:32 193.1.1.2 Ethernet1/0

4.4.4.4 1 FULL/DR 00:00:34 194.1.1.4 Ethernet0/0

r3#sh ip ro

3.0.0.0/24 is subnetted, 1 subnets

C 3.3.3.0 is directly connected, Loopback0

C 193.1.1.0/24 is directly connected, Ethernet1/0

O IA 192.1.1.0/24 [110/20] via 193.1.1.2, 00:02:49, Ethernet1/0

C 194.1.1.0/24 is directly connected, Ethernet0/0

//留意R3中有关于192.1.1.0的路由是属于IA类型(域间路由)

r4#sh ip os nei

Neighbor ID Pri State Dead Time Address Interface

3.3.3.3 1 FULL/BDR 00:00:33 194.1.1.3 Ethernet0/0

r4#sh ip ro

4.0.0.0/24 is subnetted, 1 subnets

C 4.4.4.0 is directly connected, Loopback0

C 194.1.1.0/24 is directly connected, Ethernet0/0

//R4上没有关于AREA 0内的任何路由信息

我们下面在R2、R3上添加Virtual-link的设置设置设备摆设摆设:

R2:

router os 1

area 1 virtual-link 3.3.3.3

R3:

router os 1

area 1 virtual-link 2.2.2.2

比较之前的路由信息,看有何差别:

r1#sh ip ro

1.0.0.0/24 is subnetted, 1 subnets

C 1.1.1.0 is directly connected, Loopback0

O IA 193.1.1.0/24 [110/20] via 192.1.1.2, 00:00:01, Ethernet0/0

C 192.1.1.0/24 is directly connected, Ethernet0/0

O IA 194.1.1.0/24 [110/30] via 192.1.1.2, 00:00:01, Ethernet0/0

//多了一条194网段的路由,类型IA(区域间)

r2#sh ip ro

2.0.0.0/24 is subnetted, 1 subnets

C 2.2.2.0 is directly connected, Loopback0

C 193.1.1.0/24 is directly connected, Ethernet1/0

C 192.1.1.0/24 is directly connected, Ethernet0/0

O IA 194.1.1.0/24 [110/20] via 193.1.1.3, 00:00:06, Ethernet1/0

//多了一条194网段路由,类型为IA(区域间)

r3#sh ip ro

3.0.0.0/24 is subnetted, 1 subnets

C 3.3.3.0 is directly connected, Loopback0

C 193.1.1.0/24 is directly connected, Ethernet1/0

O 192.1.1.0/24 [110/20] via 193.1.1.2, 00:02:56, Ethernet1/0

C 194.1.1.0/24 is directly connected, Ethernet0/0

//R3的192路由蓝本为IA类型(区域间),现在转为O类型(区域内),阐明R3觉得自已与192网段是直连的。虚链路相称于将R3直接连接了AREA 0 与 AREA 4区域

r4#sh ip ro

4.0.0.0/24 is subnetted, 1 subnets

C 4.4.4.0 is directly connected, Loopback0

O IA 193.1.1.0/24 [110/20] via 194.1.1.3, 00:03:40, Ethernet0/0

O IA 192.1.1.0/24 [110/30] via 194.1.1.3, 00:03:25, Ethernet0/0

C 194.1.1.0/24 is directly connected, Ethernet0/0

//R4上192路由类型IA(区域间)

着末我们将虚链路效果再与正常连接要领进行一下比对,如下图:

验证如下:

r1#sh ip ro

1.0.0.0/24 is subnetted, 1 subnets

C 1.1.1.0 is directly connected, Loopback0

O IA 193.1.1.0/24 [110/20] via 192.1.1.2, 00:00:41, Ethernet0/0

C 192.1.1.0/24 is directly connected, Ethernet0/0

C 192.2.2.0/24 is directly connected, Ethernet1/0

O IA 194.1.1.0/24 [110/20] via 192.2.2.4, 00:00:39, Ethernet1/0

r2#sh ip ro

2.0.0.0/24 is subnetted, 1 subnets

C 2.2.2.0 is directly connected, Loopback0

C 193.1.1.0/24 is directly connected, Ethernet1/0

C 192.1.1.0/24 is directly connected, Ethernet0/0

O 192.2.2.0/24 [110/20] via 192.1.1.1, 00:01:04, Ethernet0/0

O IA 194.1.1.0/24 [110/30] via 192.1.1.1, 00:00:03, Ethernet0/0

r2#

r3#sh ip ro

3.0.0.0/24 is subnetted, 1 subnets

C 3.3.3.0 is directly connected, Loopback0

C 193.1.1.0/24 is directly connected, Ethernet1/0

O IA 192.1.1.0/24 [110/20] via 193.1.1.2, 00:01:31, Ethernet1/0

O IA 192.2.2.0/24 [110/30] via 193.1.1.2, 00:01:15, Ethernet1/0

O IA 194.1.1.0/24 [110/40] via 193.1.1.2, 00:00:15, Ethernet1/0

r4#sh ip ro

4.0.0.0/24 is subnetted, 1 subnets

C 4.4.4.0 is directly connected, Loopback0

O IA 193.1.1.0/24 [110/30] via 192.2.2.1, 00:00:39, Ethernet1/0

O 192.1.1.0/24 [110/20] via 192.2.2.1, 00:01:37, Ethernet1/0

C 192.2.2.0/24 is directly connected, Ethernet1/0

C 194.1.1.0/24 is directly connected, Ethernet0/0

r5#sh ip ro

5.0.0.0/24 is subnetted, 1 subnets

C 5.5.5.0 is directly connected, Loopback0

O IA 193.1.1.0/24 [110/40] via 194.1.1.4, 00:00:52, Ethernet0/0

O IA 192.1.1.0/24 [110/30] via 194.1.1.4, 00:00:52, Ethernet0/0

O IA 192.2.2.0/24 [110/20] via 194.1.1.4, 00:00:52, Ethernet0/0

C 194.1.1.0/24 is directly connected, Ethernet0/0

假如上述要领还不轻易理解,你也可以将virtual-link可以想象成:将R2与R3合并成一台路由器,如下图:

r1#sh ip ro

1.0.0.0/24 is subnetted, 1 subnets

C 1.1.1.0 is directly connected, Loopback0

O IA 193.1.1.0/24 [110/20] via 192.1.1.2, 00:00:57, Ethernet0/0

C 192.1.1.0/24 is directly connected, Ethernet0/0

O IA 194.1.1.0/24 [110/74] via 192.1.1.2, 00:00:24, Ethernet0/0

r2#sh ip ro

2.0.0.0/24 is subnetted, 1 subnets

C 2.2.2.0 is directly connected, Loopback0

C 193.1.1.0/24 is directly connected, Ethernet1/0

C 192.1.1.0/24 is directly connected, Ethernet0/0

C 194.1.1.0/24 is directly connected, Serial2/0

r3#sh ip ro

3.0.0.0/24 is subnetted, 1 subnets

C 3.3.3.0 is directly connected, Loopback0

C 193.1.1.0/24 is directly connected, Ethernet1/0

O IA 192.1.1.0/24 [110/20] via 193.1.1.2, 00:01:06, Ethernet1/0

O IA 194.1.1.0/24 [110/74] via 193.1.1.2, 00:00:37, Ethernet1/0

r4#sh ip ro

4.0.0.0/24 is subnetted, 1 subnets

C 4.4.4.0 is directly connected, Loopback0

O IA 193.1.1.0/24 [110/74] via 194.1.1.2, 00:00:17, Serial2/0

O IA 192.1.1.0/24 [110/74] via 194.1.1.2, 00:00:17, Serial2/0

C 194.1.1.0/24 is directly connected, Serial2/0

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