OSPF虚链路 配置实例 + 详细验证过程

    Neighbor ID     Pri   State           Dead Time   Address         Interface

    2.2.2.2           1   FULL/BDR        00:00:33    192.1.1.2       Ethernet0/0

    r1#

    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, 00:00:19, Ethernet0/0

    C    192.1.1.0/24 is directly connected, Ethernet0/0

    //注意R1上有关于193.1.1.0的路由条目，是属于IA类型（域间路由）

    r2#sh ip os nei

    Neighbor ID     Pri   State           Dead Time   Address         Interface

    1.1.1.1           1   FULL/DR         00:00:35    192.1.1.1       Ethernet0/0

    3.3.3.3           1   FULL/BDR        00:00:35    193.1.1.3       Ethernet1/0

    r2#

    r2#

    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

    r3#sh ip os nei

    Neighbor ID     Pri   State           Dead Time   Address         Interface

    2.2.2.2           1   FULL/DR         00:00:32    193.1.1.2       Ethernet1/0

    4.4.4.4           1   FULL/DR         00:00:34    194.1.1.4       Ethernet0/0

    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, 00:02:49, Ethernet1/0

    C    194.1.1.0/24 is directly connected, Ethernet0/0

    //注意R3中有关于192.1.1.0的路由是属于IA类型（域间路由）

    r4#sh ip os nei

    Neighbor ID     Pri   State           Dead Time   Address         Interface

    3.3.3.3           1   FULL/BDR        00:00:33    194.1.1.3       Ethernet0/0

    r4#sh ip ro

         4.0.0.0/24 is subnetted, 1 subnets
    C       4.4.4.0 is directly connected, Loopback0

    C    194.1.1.0/24 is directly connected, Ethernet0/0

    //R4上没有关于AREA 0内的任何路由信息