From: Herbert Maosa (asawilunda@googlemail.com)
Date: Wed Aug 08 2007 - 11:17:59 ART
Without confirming this in a lab, my opinion is that if you have two such
routes, you are going to take the path that is metrically closer to the ASBR
that generated the external route. However if that ASBR is in another area,
then you will follow Area 0 since all Inter-area traffic has to go through
area 0, regardless of cost.
my two cents worth.
Herbert.
On 8/8/07, mam phuquoc <mamphuquoc@gmail.com> wrote:
>
> Hi all,
>
> question, if there is an ABR router with some interfaces in area 0 and
> other
> interfaces in nssa area 5. If there is an external route redistributed in
> to area 0 as a type E1, and the same route is redsitributed into nssa area
> 5, the router acting as the abr will see both in the ospf database, but
> which one will it use and put in the routing table, the nssa route, or
> the
> E1 route from area 0?
>
> Is this network topology below valid? Can both ABR inject a default route
> into the NSSA area 5 and use metric to pick the preferred path? Or can you
> have only one ABR in a NSSA?
>
> THank you.
>
>
> area0
> ------------------------------------------ABR-------------------------------nssa
> 5
>
> | |
> |
> |
> area
> 0 nssa 5
>
> | |
>
> | |
> area0 ----------------------------------------
> ABR----------------------------------nssa 5
>
> announcing route 10.0.0.0-------> <---------------announcing
> route 10.0.0.0
>
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-- Kindest regards, hm
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