From: Herbert Maosa (asawilunda@googlemail.com)
Date: Mon Nov 05 2007 - 14:41:59 ART
Given that OSPF does not pre-empt a DR even if a router with higher priority
comes online, I dont think there is a way to to provide this guarantee
without setting the other routers' priority to zero as you state. Point to
note on meshed multi-access networks is that if you set all other routers
with a priority of zero, and then you lose the DR, you will have no
adjacencies on the LAN even though the topology is allowing for full mesh
connectivity.
Keep in mind that when priorities are equal, the OSPF Router ID is the tie
breaker.
Herbert.
On 11/5/07, Eric Phillips <ephillips@squick.cc> wrote:
>
> Hey all,
>
> I have done quite a bit of Googling and DOC-CD reading, and have not found
> anyone offering any clever ways to force the election of a certain router
> as
> the DR besides setting the priority to 0 on all other routers.
>
> For example, if I had a question that asked me to ensure Router1 was
> always
> the DR on a certain segment without touching the configuration of Router2
> and Router3 I can set the priority very high on Router1, but if Router1
> boots a few seconds later than Router2, Router2 will be the DR even if it
> has it's default priority of 1. The only way I can think to completely
> guarantee Router1 is always the DR is to make the priority 0 on all other
> routers.
>
> Am I missing something obvious, or am I over thinking this too much? I
> have
> not seen this asked in any practice labs, just theorizing what could
> happen.
>
> -Eric
>
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