Tuesday, June 19, 2012

OSPF DR - BDR Election (Which One Gets Elected First) - Old Chicken & Egg Problem


It's one of most popular discussions when it comes to Networks. Though most of people can answer this now stating that it's BDR which gets elected first. But not many people understand "WHY ?" behind it. 


Also more importantly there is less popular timer in OSPF world known as "WAIT TIMER" which in some way is also related to DR/BDR Election.


So I am putting different URLs together talking about all these:


https://learningnetwork.cisco.com/thread/42177?tstart=0

https://supportforums.cisco.com/thread/206322

http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080094056.shtml

https://learningnetwork.cisco.com/thread/38584


HTH...
Deepak Arora
Evil CCIE

3 comments:

anuj said...

Superlike to this post sir .....
As always nice presentation with pic :)

Praveen said...

so much thanks Deepak for starting new stuffs on OSPF and WAITING FOR BGP .................also lab scenario keep going brother....once again thanks....

Praveen said...

i read the links but still point is why BDR elect first............as link say it check highest priority in hello massage if it tie than highest router id break the tie but why BDR choose first not mention.............pls u clear the doubts...