实验 OSPF虚链路配置

【实验名称】

OSPF虚链路配置

【实验目的】

OSPF虚链路技术。

【背景描述】

你是一名高级技术支持工程师，你的朋友向你请教网络拓展的问题，朋友的公司采用OSPF路由协议把网络互联起来，由于业务的增长，最近又加了一个区域，由于骨干网络已经没有接口，被迫把该区域连接到与骨干直连的非骨干区域上，由于急于使用，请教你一个暂时解决和骨干通信的办法，请你给予支持。下图，area2没有与area0直连。

【实现功能】 实现不能与骨干网络直连的ospf区域与骨干网络交互信息。

R2(config-router)#area 1 virtual-link 192.168.34.3 ！配置虚链路穿越area 1 R3(config-router)#area 1 virtual-link 192.168.23.2 ！配置虚链路穿越area 1

【实验拓扑】

【实验设备】 R2624路由器（4台）、V35DCE（3根）、V35DTE（3根）

【实验步骤】

第一步：基本配置

Red-Giant(config)#hostname R4 R4(config)#int s0

R4(config-if)#ip add 192.168.34.4 255.255.255.0 R4(config-if)#no sh

R4(config-if)#end

R4(config)#interface loopback 1

R4(config-if)#ip add 4.4.4.4 255.255.255.0 Red-Giant(config)#hostname R3 R3(config)#int s0

R3(config-if)#ip add 192.168.34.3 255.255.255.0 R3(config-if)#cloclk rate 000 R3(config-if)#no sh R3(config)#int s1

R3(config-if)#ip add 192.168.23.3 255.255.255.0 R3(config-if)#no sh

Red-Giant (config)#hos R2

R2(config)#int s1

R2(config-if)#ip add 192.168.23.2 255.255.255.0 R2(config-if)#cl ra 000 R2(config-if)#no sh R2(config)#int s0

R2(config-if)#ip add 192.168.12.2 255.255.255.0 R2(config-if)#no sh

Red-Giant#conf t

Enter configuration commands, one per line. End with CNTL/Z. Red-Giant(config)#hos

Red-Giant(config)#hostname R1 R1(config)#int s0

R1(config-if)#ip add 192.168.12.1 255.255.255.0 R1(config-if)#cl ra 000 R1(config-if)#no sh R1(config-if)#end

第二步：配置OSPF路由协议 R4(config)#router os 1

R4(config-router)#network 192.168. 34.0 0.0.0.255 area 2 R4(config-router)#net 4.4.4.0 0.0.0.255 aera 2

R4(config-router)#end R3(config)#router ospf 1

R3(config-router)#net work 192.168.34.0 0.0.0.255 area 2 R3(config-router)# end

R2(config)#router ospf 1

R2(config-router)#network 192.168.23.0 0.0.0.255 area 1 R2(config-router)#network 192.168.12.0 0.0.0.255 area 0 R1(config)#router os 1

R1(config-router)#net 192.168.12.0 0.0.0.255 area 0 R1(config-router)#end

验证测试：R1#sh ip rou

Codes: C - connected, S - static, R - RIP

O - OSPF, IA - OSPF inter area

E1 - OSPF external type 1, E2 - OSPF external type 2

Gateway of last resort is not set

C 192.168.12.0/24 is directly connected, Serial0

O IA 192.168.23.0/24 [110/96] via 192.168.12.2, 00:00:42, Serial0 ! R1没有收到来自区域2的路由

第三步：配置虚链路

R2(config-router)#area 1 virtual-link 192.168.34.3 ！配置虚链路穿越area 1 R3(config-router)#area 1 virtual-link 192.168.23.2 ！配置虚链路穿越area 1

验证测试：R3#sh ip os virtual-links

Virtual Link to router 192.168.23.2 is up

Transit area 1, via interface Serial1, Cost of using 48 Transmit Delay is 1 sec, State POINT_TO_POINT,

Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5 Hello due in 00:00:05

Adjacency State FULL R1#sh ip ro

Codes: C - connected, S - static, R - RIP

O - OSPF, IA - OSPF inter area

E1 - OSPF external type 1, E2 - OSPF external type 2

Gateway of last resort is not set

4.0.0.0/32 is subnetted, 1 subnets

O IA 4.4.4.4 [110/145] via 192.168.12.2, 00:00:47, Serial0 O IA 192.168.34.0/24 [110/144] via 192.168.12.2, 00:03:17, Serial0 C 192.168.12.0/24 is directly connected, Serial0

O IA 192.168.23.0/24 [110/96] via 192.168.12.2, 00:03:17, Serial0 ! 已经收到了来自于区域2的路由

【注意事项】

 

注意连接骨干和非直连区域的中间区域的区域号；

注意连接骨干和非直连区域的中间区域的邻居建立的ROUTER_ID 。

【参考配置】 （

R4#sh run

Building configuration...

Current configuration: !

hostname \"R4\" !

ip subnet-zero !

interface Loopback1

ip address 4.4.4.4 255.255.255.0 !

interface FastEthernet0 no ip address

shutdown

!

interface FastEthernet1 no ip address !

interface FastEthernet2 no ip address shutdown !

interface FastEthernet3 no ip address shutdown !

interface Serial0

ip address 192.168.34.4 255.255.255.0 !

interface Serial1 no ip address shutdown !

router ospf 1

network 192.168.34.0 0.0.0.255 area 2 network 4.4.4.0 0.0.0.255 area 2 !

ip classless !

line con 0 line aux 0 line vty 0 4 login ! end

R3#sh run

Building configuration...

Current configuration: !

hostname \"R3\" !

ip subnet-zero !

interface FastEthernet0 no ip address !

interface FastEthernet1 no ip address !

interface FastEthernet2 no ip address !

interface FastEthernet3 no ip address shutdown !

interface Serial0

ip address 192.168.34.3 255.255.255.0 clock rate 000 !

interface Serial1

ip address 192.168.23.3 255.255.255.0 !

router ospf 1

network 192.168.34.0 0.0.0.255 area 2 network 192.168.23.0 0.0.0.255 area 1 area 1 virtual-link 192.168.23.2 !

ip classless !

line con 0 line aux 0 line vty 0 4 login ! end

R2#sh run

Building configuration...

Current configuration: !

hostname \"R2\" !

ip subnet-zero !

interface FastEthernet0 no ip address shutdown !

interface FastEthernet1

no ip address shutdown !

interface FastEthernet2 no ip address !

interface FastEthernet3 no ip address shutdown !

interface Serial0

ip address 192.168.12.2 255.255.255.0 !

interface Serial1

ip address 192.168.23.2 255.255.255.0 clock rate 000

!

router ospf 1

network 192.168.23.0 0.0.0.255 area 1 network 192.168.12.0 0.0.0.255 area 0 area 1 virtual-link 192.168.34.3 !

ip classless !

line con 0 line aux 0 line vty 0 4 login ! end

R1#sh run

Building configuration...

Current configuration: !

hostname \"R1\" !

ip subnet-zero !

interface FastEthernet0 no ip address shutdown !

interface FastEthernet1

no ip address shutdown !

interface FastEthernet2 no ip address shutdown !

interface FastEthernet3 no ip address shutdown !

interface Serial0

ip address 192.168.12.1 255.255.255.0 clock rate 000 !

interface Serial1 no ip address shutdown !

router ospf 1

network 192.168.12.0 0.0.0.255 area 0 !

ip classless !

line con 0 line aux 0 line vty 0 4 login ! end