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OSPF DR and BDR election

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18 years 1 week ago #18887 by thecoalfielders
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 ??
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17 years 8 months ago #21107 by krik
Replied by krik on topic Re: OSPF DR and BDR election
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.

Christophe Lemaire
www.exp-networks.be/blog/
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16 years 5 months ago #26690 by ariff
Replied by ariff on topic Re: OSPF DR and BDR election
untill OSPF reload it wont take any decision on router A as a DR or BDR .
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16 years 1 month ago #27938 by jack_jill
Replied by jack_jill on topic DR BDR election
Pls tell me , In a DR , BDR election , Is it the DR or BDR getting elected first?
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15 years 1 week ago #33050 by kchong_14
Replied by kchong_14 on topic DR/BDR
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.

Kenneth Chong
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