Broadcast OSPF on Multiple Access Links

The OSPF on the broadcast Multi-Channel Access link starts the OSPF process on each device on the broadcast Multi-Channel Access link according to the parameters in. Here, I only use R1 as an example to describe how to enable the OSPF process: www.2cto.com.
1 "router (config) # router ospf 1 router (config-router) # router-id 1.1.1.1 router (config-router) # network 1.1.1.0 0.0.255 area 0 router (config-router) # network 192.168.1.0 0.0.0.255 area 0 and start the OSPF process on R2, R3, and R4 in the same way.
2. Experiment debugging ● Router # show ip ospf interface f0/0 FastEthernet0/0 is up, line protocol is up Internet address is 192.168.1.1/24, Area 0 Process ID 1, router ID 1.1.1.1, Network Type BROADCAST, Cost: 1
The above line shows that the OSPF process enabled on the vro is 1, the ID of the vro is 1.1.1.1, and the network type connected by F0/0 is broadcast multi-channel access, the COST value of this port is 1. www.2cto.com Transmit Delay is 1 sec, State DROTHER, Priority 1 (F0/0 interface Priority, the interface Priority range is 0-255) Designated Router (ID) 4.4.4.4, interface address 192.168.1.4 (DR on this broadcast channel is R4) Backup Designated Router (ID) 3.3.3.3, Interface address 192.168.1.3 (BDR on this broadcast channel is R3) Timer intervals configured, hello 10, Dead 40, Wait 40, Retransmit 5 Hello due in 00:00:08 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 3, Adjacent neighbor count is 2
The above line shows that there are three R1 neighbors, and there are two adjacent relations, obviously the two are R4 (DR) and R3 (BDR ). There are two different concepts: Neighbor Relationship refers to the 2way state, and the neighbor relationship refers to the FULL state. Www.2cto.com Adjacent with neighbor 4.4.4.4 (Designated Router) Adjacent with neighbor 3.3.3.3 (Backup Designated Router) Suppress hello for 0 neighbor (s) ◆ Router # show ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface4.4.4.4 1 FULL/DR 00:00:31 192.168.1.4 FastEthernet0/03.3.3.3 1 FULL/BDR 00:00:31 192.168.1.3 FastEthernet0/02.2.2.2 1 2WAY/DROTHER 00:00:31 192.168.1.2 FastEthernet0/0
The above results show that R1 has three neighbors, where 3.3.3.3 and 4.4.4.4 are BDR and DR. We can see that the STATE of the router that establishes the neighbor relationship is 2WAY, the STATE of the router that establishes the adjacent relationship is FULL.
Note: why DR is 4.4.4 BDR is 3.3.3.3 which is consistent with the DR election principles I mentioned in the OSPF protocol's detailed illustration http://www.bkjia.com/net/201210/159826.html. The experiment is over!