From: Peter van Oene (pvo@usermail.com)
Date: Sat Oct 19 2002 - 23:10:47 GMT-3
OSPF used non preemptive DR selection, and therefore the first router up
and functional on a segment will likely become the DR and stay that
way. In hub and spoke, the best thing to do is set your spokes to priority
0, therefore making them ineligible to become DR and thus your hub should
fill that role every time.
At 09:50 AM 10/20/2002 +1000, Hunt Lee wrote:
>Guys,
>
>I'm sure this question has been asked many times before, but can
>someone kindly explain to me again? There are 3 routers in a hub &
>spoke topology that I want to influence the DR election. And I'm doing
>this with "(config-router)# neighbor <x.x.x.x> priority <y>" command -
>I also tried "(config-if)# ip ospf priority <y>" command. I have been
>reloading the routers (as well as taking down OSPF by "no router ospf
><x>" & putting OSPF back on, and every time the DR, BDR & DROther is
>different.
>
>I have read Caslow & Jeff Doyle, they both agree that the router with
>the highest priority (on an interface basis) will be the DR for that
>subnet, while Parkhurst says that the router with the lowest non-zero
>priority will be elected the DR. So who is correct?? And why is the
>DR/BDR/DROther are different each time?
>
>Thanks in advance,
>
>Hunt
>
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