From: Redden Jeremiah (Jeremiah.Redden@HCAhealthcare.com)
Date: Tue Feb 07 2006 - 14:40:49 GMT-3
I am wondering about the OSPF DR and BDR election process. Let's say I have
a broadcast segment consisting of four routers. I configure routerA with an
ip ospf priority of 255, routerB has an ip ospf priority of 250, and the
remaining two routers have a default ip ospf priority of 1. So routerA is
the DR and routerB is the BDR. A link failure causes routerA to enter
interface down state, which in turns causes routerB to now become the DR. A
new election will take place and the two remaining routers having the same
ip ospf priority of 1, will now use the highest router ID to become the BDR.
Moments later, the interface for routerA comes back up. Is it correct to say
that there will be no new election taking place so routerA will not become
the DR again (no ip ospf priority preempt?) I would like the stability of
the network (routing database) to be routerA for DR and routerB for BDR
becuase these two routers have more CPU processing cycles as oppose to the
remaining 2 routers.
I have searched through last years emails to see if there was anything on
this topic so that there isn't any overlap, but I couldn't find anything
there. I have also looked at RFC 2328, cisco.com/univercd, and numerous
Cisco Press CCIE books to no avail. I would appreciate any help with this
question.
Jeremiah Redden (J.R.)
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