4.3 配置接口的网络类型

1.查看R1路由表，R2、R3环回口路由为32位主机路由

[R1]display ip routing-table protocol ospf 
 2.2.2.2/32  OSPF    10   1           D   12.1.1.2        GigabitEthernet0/0/0
        3.3.3.3/32  OSPF    10   2           D   12.1.1.2        GigabitEthernet0/0/0
       23.0.0.0/8   OSPF    10   2           D   12.1.1.2        GigabitEthernet0/0/0

2.查看R2环回口网络类型，OSPF类型为P2P，都是32位主机路由

<R2>display ospf interface LoopBack 0
         OSPF Process 1 with Router ID 2.2.2.2
                 Interfaces 
 Interface: 2.2.2.2 (LoopBack0)
 Cost: 0       State: P-2-P     Type: P2P       MTU: 1500  
 Timers: Hello 10 , Dead 40 , Poll  120 , Retransmit 5 , Transmit Delay 1 

3.R2修改环回接口网络类型

[R2]interface LoopBack 0
[R2-LoopBack0]ospf network-type broadcast 

4.查看R1路由表，R2环回口路由变为24位主机路由

[R1]display ip routing-table protocol ospf
        2.2.2.0/24  OSPF    10   1           D   12.1.1.2        GigabitEthernet0/0/0
        3.3.3.3/32  OSPF    10   2           D   12.1.1.2        GigabitEthernet0/0/0

5.查看R2环回口网络类型为 Broadcast

[R2]display ospf interface LoopBack 0
 Interface: 2.2.2.2 (LoopBack0)
 Cost: 0       State: DR        Type: Broadcast    MTU: 1500