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TOPIC: OSPF DR and BDR election

OSPF DR and BDR election 11 years 8 months ago #18887

Hi, I have a doubt related to the OSPF DR and the BDR election.

If Router A is a DR and Router B is BDR. Now router A fails and B becomes the DR. What will happen when router A comes up. Will there be a re-election ??

Re: OSPF DR and BDR election 11 years 3 months ago #21107

  • krik
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When an OSPF router becomes active and discovers its neighbors, it checks for an active DR and BDR. If a DR and BDR exist, the router accept them. If there is no BDR, an election is held in which the router with the highest priority becomes the BDR. If there is no active DR, the BDR is promoted to DR and a new election is held for the BDR.

It should be noted taht the priority can influence an election, but will not override an active DR or BDR. If there are already DR and BDR on the LAN, they will remain DR and BDR until a failure.

Re: OSPF DR and BDR election 10 years 1 month ago #26690

untill OSPF reload it wont take any decision on router A as a DR or BDR .

DR BDR election 9 years 9 months ago #27938

Pls tell me , In a DR , BDR election , Is it the DR or BDR getting elected first?

DR/BDR 8 years 8 months ago #33050

Hi jack,

If I understood your question properly, you asking which one is elected first, DR or BDR?

for that:

The DR is the first to be elected, and then the same process will repeat again for electing the BDR.
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