OSPF虚链路 配置实例 + 详细验证过程

    如果上述方式还不容易理解，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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