OSPF Network Types                        默认接口                                  特点

        1.Loopback                               环回口                                 32位主机路由

        2.Point-to-Point                        Serial/BRI/FR's P2Psub-if   组播更新/无DR       

        3.Broadcast                               Ethernet                              组播/有DR

        4.NBMA                                     FR's Physical/FR's MPsub-if     单播

        5.P2MP                                    --------------                         组播更新/无DR/32位路由

        6.P2MP NBMA                        --------------                         单播/无DR/32位路由

ps:

    将loopback网络类型转换为点到点 可以还原真实的掩码信息

    ip ospf network point-to-point

    ip ospf network broadcast

    wait 40S 选完DR

    ip ospf network no-broadcast 选择DR

    HELLO 30S

    拒绝组播/广播 改单播更新

        router ospf 110

        neighbor 12.1.1.2 单边打即可 因为HELLO传过去会有源地址

    ip ospf network point-to-multipoint

            HELLO 30S

            不选择DR

            组播更新

            产生一条对方直连接口的32位路由

    ip ospf point-multipoint non-broadcast

            单播更新

            不选DR

             产生一条对方直连接口的32位路由

修改HELLO包间隔时间来将不同网络类型接口建立邻居关系

        ip ospf hello-interval 30

P2MP 30

p2p    10  ->30