Re: OSPF Down bit

Hi Bilal,

As far as I know, the down bit is set only on LSA3.
For LSA5 and LSA7 you must use tags.

Let me check it on the lab and I will come back to you with the results.

www.initialdraft.com

On Wed, May 4, 2011 at 3:12 AM, Bilal Hansrod <bilal.hansrod_at_gmail.com>wrote:

> Hello Everyone,
>
> Can anyone kind enough to clarify my theoretical doubts about OSPF Down
> bit.
> This is what I believe; please correct me if I am wrong
> CE1 advertise OSPF routes to PE1
>
> PE1 redistributes OSPF routes into MBGP
>
> PE2 redistributes MBPG routes into OSPF and set Down bit and advertises to
> CE2
>
> CE2 advertises back same route to PE1 via additional connection and it is
> discarded as Down bit is set to prevent loop.
>
>
> The Down bit can only be set for LSA 2,3,7. LSA 5 doesn t support Down
> bit,
> so we use route tag to perform the same operation.
>
> Thanks,
>
> Bilal
>
>
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Received on Wed May 04 2011 - 12:14:48 ART