Points to noted
- In DR/BDR election if priority is 0 then the router can’t be elected as DR or BDR and OSPF
- OSPF is a non-preemptive activity you must run the command “clear ip ospf process”.
- DR/BDR election is per multi-access segment not per area.
- You can check the DR/BDR status in the topology using the command “show ip ospf neighbor”
Explain OSPF DR/BDR Election?
OSPF is a dynamic routing protocol. OSPF can elect one router as DR (Designated Router) and one router as BDR (Backup Designated Router).If DR fails BDR takes over. Each non-BDR or non-DR router in the network exchange routing information with DR or BDR. To send information to DR or BDR multicast IP of 224.0.0.6 is used DR sends routing information with multicast IP of 224.0.0.5.