4.18 修改OSPF网络类型为点到多点

1.R1、R2、R3修改接口的OSPF类型

[R1]interface Serial 0/0/0
[R1-Serial0/0/0]ospf network-type p2mp 

[R2]interface Serial 0/0/0
[R2-Serial0/0/0]ospf network-type p2mp 

[R3]interface Serial 0/0/0
[R3-Serial0/0/0]ospf network-type p2mp 

2.查看R1邻居表,未进行DR/BDR选举

[R1]display ospf peer 

         OSPF Process 1 with Router ID 1.1.1.1
                 Neighbors 

 Area 0.0.0.0 interface 123.1.1.1(Serial0/0/0)'s neighbors
 Router ID: 2.2.2.2          Address: 123.1.1.2       
   State: Full  Mode:Nbr is  Master  Priority: 0
   DR: None   BDR: None   MTU: 0    
   Dead timer due in 94  sec 
   Retrans timer interval: 5 
   Neighbor is up for 00:00:33     
   Authentication Sequence: [ 0 ] 

 Router ID: 3.3.3.3          Address: 123.1.1.3       
   State: Full  Mode:Nbr is  Master  Priority: 0
   DR: None   BDR: None   MTU: 0    
   Dead timer due in 115 sec 
   Retrans timer interval: 5 
   Neighbor is up for 00:00:33     
   Authentication Sequence: [ 0 ] 

3.查看接口OSPF网络类型

[R1]display ospf interface Serial 0/0/0
         OSPF Process 1 with Router ID 1.1.1.1
                 Interfaces 
 Interface: 123.1.1.1 (Serial0/0/0)
 Cost: 1562    State: P-2-P     Type: P2MP      MTU: 1500 
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