RE: how to control OSPF DR&BDR selection in NBMA networks?

From: RSiddappa@xxxxxxxxxx
Date: Sun Feb 03 2002 - 04:48:33 GMT-3


   
Great Answer Brain.

It was really a good explanation

Rajeev.

-----Original Message-----
From: Brian Dennis [mailto:brian@5g.net]
Sent: Sunday, February 03, 2002 1:28 AM
To: Wen Jia Yang; ccielab@groupstudy.com
Subject: Re: how to control OSPF DR&BDR selection in NBMA networks?

> Now I would like hub to be the DR,which one is BDR doesn't matter.

It does matter who the BDR is. You shouldn't have a BDR is this design. If
the hub is the DR and say spoke1 is the BDR when using physical interfaces
with frame-relay, what is going to happen when the hub gets rebooted?

Answer: Spoke1 will become the DR and when the hub comes back up it will see

that there already is a DR and no DR election will take place. Since spoke2
and spoke3 do not have direct communication with the DR (spoke1) your
network
will be hosed.

Brian Dennis, CCIE #2210 (R&S)(ISP/Dial)

On Saturday 02 February 2002 10:47 pm, Wen Jia Yang wrote:
> For instance,in typical hub and spoke frame-relay topology,what shall we
do
> to accomplish this?
>
> hub -------fr sw-----spoke1
> / \
> / \
> / \
> spoke2 spoke3
>
> Now I would like hub to be the DR,which one is BDR doesn't matter.
>
> what shall we do to do this?
> how many methods do we have?
>
> thanks for your help!



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