26、OSPF配置实验之不规则区域虚链路

1、实验拓扑

按拓扑所示配置好OSPF后，此时由于area2与area0之间隔着area1,此时area2中的R5并没有路由可达area3、area0、area1。为此我们在R3、R4上建立一条虚链路即可。
2、实验配置
R1配置interface Loopback0 ip address 1.1.1.1 255.255.255.0interface Serial0/0 ip address 12.1.1.1 255.255.255.0router ospf 110 router-id 1.1.1.1 network 1.1.1.0 0.0.0.255 area 3 network 12.1.1.0 0.0.0.255 area 3
R2配置interface Loopback0 ip address 2.2.2.2 255.255.255.0interface Serial0/0 ip address 12.1.1.2 255.255.255.0interface Serial0/1 ip address 23.1.1.2 255.255.255.0router ospf 110 router-id 2.2.2.2 network 2.2.2.0 0.0.0.255 area 0 network 12.1.1.0 0.0.0.255 area 3 network 23.1.1.0 0.0.0.255 area 0
R3配置interface Loopback0 ip address 3.3.3.3 255.255.255.0interface Serial0/0 ip address 34.1.1.3 255.255.255.0interface Serial0/1 ip address 23.1.1.3 255.255.255.0router ospf 110 router-id 3.3.3.3 network 3.3.3.0 0.0.0.255 area 0 network 23.1.1.0 0.0.0.255 area 0 network 34.1.1.0 0.0.0.255 area 1
R4配置interface Loopback0 ip address 4.4.4.4 255.255.255.0interface Serial0/0 ip address 34.1.1.4 255.255.255.0interface Serial0/1 ip address 45.1.1.4 255.255.255.0router ospf 110 router-id 4.4.4.4 log-adjacency-changes network 4.4.4.0 0.0.0.255 area 1 network 34.1.1.0 0.0.0.255 area 1 network 45.1.1.0 0.0.0.255 area 2
R5配置interface Loopback0 ip address 5.5.5.5 255.255.255.0interface Serial0/1 ip address 45.1.1.5 255.255.255.0router ospf 110 router-id 5.5.5.5 log-adjacency-changes network 5.5.5.0 0.0.0.255 area 2 network 45.1.1.0 0.0.0.255 area 2
3、配置OSPF虚链路



此时R1和R5都没有彼此的路由。我们将R3、R4上做如下修改R3配置
router ospf 110
area 1 virtual-link 4.4.4.4

R4配置
router ospf 110
area 1 virtual-link 3.3.3.3







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