实验拓扑图
1.R1的预配置
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Router>en Router#config t Enter configuration commands, one per line. End with CNTL/Z. Router(config)#no ip domain-lookup Router(config)#line console 0 Router(config-line)#no exec-timeout Router(config-line)#loggin syn Router(config-line)#exit Router(config)#host R1 R1(config)#int lo0 R1(config-if)#ip add 1.1.1.1 255.255.255.0 R1(config-if)#exit R1(config)#int s0/0 R1(config-if)#no shut R1(config-if)#ip add 192.168.0.1 255.255.255.0 R1(config-if)#exit |
2.R2的预配置
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Router>en Router#config t Enter configuration commands, one per line. End with CNTL/Z. Router(config)#no ip domain-lookup Router(config)#line console 0 Router(config-line)#no exec-timeout Router(config-line)#loggin syn Router(config-line)#exit Router(config)#host R2 R2(config)#int lo0 R2(config-if)#ip add 2.2.2.2 255.255.255.0 R2(config-if)#exit R2(config)#int s0/0 R2(config-if)#no shut R2(config-if)#ip add 192.168.0.2 255.255.255.0 R2(config-if)#exit R2(config)#int s0/1 R2(config-if)#no shut R2(config-if)#ip add 172.16.0.1 255.255.255.0 R2(config-if)#exit |
3.R3的预配置
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Router>en Router#config t Enter configuration commands, one per line. End with CNTL/Z. Router(config)#no ip domain-lookup Router(config)#line console 0 Router(config-line)#no exec-timeout Router(config-line)#loggin syn Router(config-line)#exit Router(config)#host R3 R3(config)#int lo0 R3(config-if)#ip add 3.3.3.3 255.255.255.0 R3(config-if)#exit R3(config)#int s0/1 R3(config-if)#no shut R3(config-if)#ip add 172.16.0.2 255.255.255.0 R3(config-if)#exit |
4.配置R1、R2和R3的OSPF
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R1(config)#router ospf 1 R1(config-router)#net 1.1.1.1 0.0.0.0 area 0 R1(config-router)#net 192.168.0.1 0.0.0.0 area 0 R1(config-router)#end |
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R2(config)#router ospf 1 R2(config-router)#net 192.168.0.2 0.0.0.0 area 0 R2(config-router)#net 172.16.0.1 0.0.0.0 area 1 R2(config-router)#end |
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R3(config)#router ospf 1 R3(config-router)#net 172.16.0.2 0.0.0.0 area 1 R3(config-router)#net 3.3.3.3 0.0.0.0 area 0 R3(config-router)#end |
5.查看OSPF邻居表
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R1#show ip ospf nei Neighbor ID Pri State Dead Time Address Interface 2.2.2.2 0 FULL/ - 00:00:35 192.168.0.2 Serial0/0 R2#show ip ospf nei Neighbor ID Pri State Dead Time Address Interface 1.1.1.1 0 FULL/ - 00:00:30 192.168.0.1 Serial0/0 3.3.3.3 0 FULL/ - 00:00:32 172.16.0.2 Serial0/1 R3#show ip ospf nei Neighbor ID Pri State Dead Time Address Interface 2.2.2.2 0 FULL/ - 00:00:30 172.16.0.1 Serial0/1 |
6.查看R1的OSPF路由表
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R1#show ip route ospf 172.16.0.0/24 is subnetted, 1 subnets O IA 172.16.0.0 [110/128] via 192.168.0.2, 00:02:28, Serial0/0 |
说明：R1路由表上只有一条到172.16.0.0网段的外部路由，没有Area 1的路由条目。
7.在R2和R3上配置虚链路，解决上面问题
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R2(config)#router ospf 1 R2(config-router)#area 1 virtual-link 3.3.3.3 //配置虚链路 R2(config-router)#end |
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R3(config)#router ospf 1 R3(config-router)#area 1 virtual-link 2.2.2.2 R3(config-router)#end |
8.再次查看R1的路由表
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R1#show ip route ospf 3.0.0.0/32 is subnetted, 1 subnets O 3.3.3.3 [110/129] via 192.168.0.2, 00:01:10, Serial0/0 //路由表中出现到3.3.3.3的路由条目 O IA 172.16.0.0 [110/128] via 192.168.0.2, 00:01:10, Serial0/0 |
9.查看R1的链路状态数据库
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R1#show ip ospf da OSPF Router with ID (1.1.1.1) (Process ID 1) Router Link States (Area 0) //1型的LSA Link ID ADV Router Age Seq# Checksum Link count 1.1.1.1 1.1.1.1 693 0x80000002 0x003674 3 2.2.2.2 2.2.2.2 153 0x80000002 0x007826 3 3.3.3.3 3.3.3.3 2 (DNA) 0x80000002 0x00A94A 2 Summary Net Link States (Area 0) //3型的LSA Link ID ADV Router Age Seq# Checksum 172.16.0.0 2.2.2.2 689 0x80000001 0x004AED 172.16.0.0 3.3.3.3 522 (DNA) 0x80000001 0x002C08 |
10.测试连通性
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R1#ping 3.3.3.3 source 1.1.1.1 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 3.3.3.3, timeout is 2 seconds: Packet sent with a source address of 1.1.1.1 !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 28/51/88 ms |
实验过程
