OSPF為什麽同一個區域內會有多個DR/BDR
按上面的拓撲圖為例子：
在R8上面查看OSPF有兩個DR/BDR
R8#show ip os
R8#show ip ospf ne
R8#show ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface
7.7.7.7 1 FULL/DR 00:00:32 120.0.0.7 FastEthernet0/1
10.10.10.10 1 FULL/BDR 00:00:32 120.0.0.10 FastEthernet0/1
9.9.9.9 1 FULL/BDR 00:00:32 110.0.0.9 FastEthernet0/0
R6上面查看OSPF有兩個DR/BDR：
R6#show ip os
R6#show ip ospf ne
Neighbor ID Pri State Dead Time Address Interface
8.8.8.8 1 FULL/DROTHER 00:00:37 110.0.0.8 FastEthernet0/0
R9#show ip os
R9#show ip ospf ne
Neighbor ID Pri State Dead Time Address Interface
6.6.6.6 1 FULL/DR 00:00:37 110.0.0.6 FastEthernet0/0
8.8.8.8 1 FULL/DROTHER 00:00:39 110.0.0.8 FastEthernet0/0
R7#show ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface
8.8.8.8 1 FULL/DROTHER 00:00:32 120.0.0.8 FastEthernet0/1
10.10.10.10 1 FULL/BDR 00:00:35 120.0.0.10 FastEthernet0/1
R10#show ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface
7.7.7.7 1 FULL/DR 00:00:37 120.0.0.7 FastEthernet0/1
8.8.8.8 1 FULL/DROTHER 00:00:34 120.0.0.8 FastEthernet0/1
OSPF為什麽同一個區域內會有多個DR/BDR