Re: Any way to force OSPF DR other than "priority 0"?

From: Eric Phillips (ephillips@squick.cc)
Date: Mon Nov 05 2007 - 15:03:26 ART


Definitely would be interesting to see.

I have not heard of scripting being required for any task in the IE lab, but
it certainly would be good to be vaguely familiar with it.

On 11/5/07, Joseph Brunner <joe@affirmedsystems.com> wrote:
>
> As you know the DR is not preempt-able
>
> I could do this with EEM;
>
> Basically script up an applet that restarts the ospf process on a router
> that receives a new neighbor adj = router 1. If router 2 and 3 are running
> this applet, and they clear their neighbor adjacency, 1 will be the dr on
> the wire when the restart.
>
> That touches the config on R2 & R3, but does not touch priority from
> default
> of 1. OF course I would demand 5 points from the proctor's for being a
> little hacker and doing this... LOL
>
> Would you like to see it?
>
> -Joe
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Eric
> Phillips
> Sent: Monday, November 05, 2007 12:05 PM
> To: ccielab@groupstudy.com
> Subject: Any way to force OSPF DR other than "priority 0"?
>
> 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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