OSPF虚链路 配置实例 + 详细验证过程

   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