13-高级路由：OSPF DR BDR实验（新路由3 极路由4）

13-高级路由：OSPF DR BDR实验（新路由3 极路由4）

R1(config)#int f0/0R1(config-if)#ip ospf priority 10 修改优先级

注意：增加R6，如果把200.1.1.6通告进入area 0，那么R6就是新的DR；如果通告进area 1，那么R6是200.1.1.0的DR，R5是200.1.1.0的BDR；这样结果，R5既是DR又是BDR，只不过在不同的网段。

1、验证：重启后/清除进程后R1#show ip ospf neighbor Neighbor ID Pri State Dead Time Address Interface2.2.2.2 1 2WAY/DROTHER 00:00:32 100.1.1.2 FastEthernet0/03.3.3.3 1 2WAY/DROTHER 00:00:32 100.1.1.3 FastEthernet0/04.4.4.4 1 FULL/BDR 00:00:34 100.1.1.4 FastEthernet0/05.5.5.5 1 FULL/DR 00:00:35 100.1.1.5 FastEthernet0/02、验证：R1增加优先级重启后R2#show ip ospf neighbor

Neighbor ID Pri State Dead Time Address Interface1.1.1.1 10 FULL/DR 00:00:36 100.1.1.1 FastEthernet0/03.3.3.3 1 2WAY/DROTHER 00:00:36 100.1.1.3 FastEthernet0/04.4.4.4 1 2WAY/DROTHER 00:00:36 100.1.1.4 FastEthernet0/05.5.5.5 1 FULL/BDR

R1(config)#int f0/0R1(config-if)#shutdownR2#show ip ospf neighbor Neighbor ID Pri State Dead Time Address Interface3.3.3.3 1 2WAY/DROTHER 00:00:30 100.1.1.3 FastEthernet0/04.4.4.4 1 FULL/BDR 00:00:34 100.1.1.4 FastEthernet0/05.5.5.5 1 FULL/DR 00:00:34 100.1.1.5 FastEthernet0/03、R3、R4把优先级改为0后R4(config)#int f0/0R4(config-if)#ip ospf priority 0R3(config)#int f0/0R3(config-if)#ip ospf priority 0

R2#show ip ospf neighbor Neighbor ID Pri State Dead Time Address Interface3.3.3.3 0 FULL/DROTHER 00:00:34 100.1.1.3 FastEthernet0/04.4.4.4 0 FULL/DROTHER 00:00:35 100.1.1.4 FastEthernet0/05.5.5.5 1 FULL/DR 4、增加R6后：R2#show ip ospf neighbor Neighbor ID Pri State Dead Time Address Interface3.3.3.3 0 FULL/DROTHER 00:00:38 100.1.1.3 FastEthernet0/04.4.4.4 0 FULL/DROTHER 00:00:38 100.1.1.4 FastEthernet0/05.5.5.5 1 FULL/DR 00:00:39 100.1.1.5 FastEthernet0/0

R6#show ip ospf neighbor

Neighbor ID Pri State Dead Time Address Interface5.5.5.5 1 FULL/BDR 00:00:34 200.1.1.5 FastEthernet0/0

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