From: Ahsan Mohiuddin (ahsan.mohiuddin@yahoo.com)
Date: Mon Nov 05 2007 - 23:25:01 ART
Hi Tarun,
That's pretty interesting. If my local priority is 1 (default) and a neighbor is sending (in hellos) 2, do I become the DR (assuming all others are set to 1) ?
Tarun Pahuja <pahujat@gmail.com> wrote: Eric,
If the worry is that during a reboot one of the spokes might come up
first and declare itself as the DR, You will have to set the priority of the
spokes to 0, so that they do not participate in the election process.
If you are not allowed to use priority statement at the spokes, then you
know what the default priority is(1). After raising the priority of the Hub
router(greater than 1), you may clear the OSPF process for re-election to
take place and hub be selected as the DR.
The neighbor priority command at the hub site can be misleading sometimes,
it actually complairs the priority specified in the configuration with the
priority in the hello message received from the neighbor and modifies it's
value to be the greater of the two.
HTH,
Tarun
On 11/5/07, Eric Phillips 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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