预配置 R1(config)#int lo0 R1(config-if)#ip add 1.1.1.1 255.255.255.0 R1(config-if)#int s2/1 R1(config-if)#ip add 12.1.1.1 255.255.255.0 R1(config-if)#no sh R1(config)#router os 11 R1(config-router)#net 1.1.1.1 0.0.0.255 a 0 R1(config-router)#net 12.1.1.1 0.0.0.255 a 0 R1(config-router)#end R2(config)#int lo0 R2(config-if)#ip add 2.2.2.2 255.255.255.0 R2(config-if)#int s2/1 R2(config-if)#ip add 12.1.1.2 255.255.255.0 R2(config-if)#no sh R2(config)#router os 11 R2(config-router)#net 2.2.2.2 0.0.0.255 a 0 R2(config-router)#net 12.1.1.2 0.0.0.255 a 0 R2(config-router)#end R2(config-router)#end

R1#sh ip o i s2/1 Serial2/1 is up, line protocol is up Internet Address 12.1.1.1/24, Area 0 Process ID 11, Router ID 1.1.1.1, , Cost: 64 Transmit Delay is 1 sec, State POINT_TO_POINT, Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5 oob-resync timeout 40 Hello due in 00:00:07 Index 2/2, flood queue length 0 Next 0x0(0)/0x0(0) Last flood scan length is 1, maximum is 1 Last flood scan time is 0 msec, maximum is 0 msec Neighbor Count is 1, Adjacent neighbor count is 1 Adjacent with neighbor 2.2.2.2 Suppress hello for 0 neighbor(s) R1#sh ip ospf nei //这里为点到点的类型,所以没有选择DR和BDR Neighbor ID Pri State Dead Time Address Interface 2.2.2.2 0 FULL/ - 00:00:33 12.1.1.2 Serial2/1 点到点不选择DR/BDR所以state下面是一条横线“-” 第二步:修改网络类型为广播 R2(config)#int s2/1 R2(config-if)#ip o n b

R1(config)#int s2/1 R1(config-if)#ip o n b *Nov 21 22:10:49.683: %OSPF-5-ADJCHG: Process 11, Nbr 2.2.2.2 on Serial2/1 from LOADING to FULL, Loading Done //看到了这样的日志。ospf正常 第三步:查看修改后的网络类型和邻居关系 R1#sh ip o i s2/1 R2#sh ip o i s2/1

R1#sh ip o n

Neighbor ID Pri State Dead Time Address Interface 2.2.2.2 1 FULL/DR 00:00:39 12.1.1.2 Serial2/1 //广播的类型选出了DR和BDR

简单总结: 在ospf中可以将ospf的网络类型修改为 具体的我们在帧中继实验中演示