From: mam phuquoc (mamphuquoc@gmail.com)
Date: Wed Aug 08 2007 - 11:35:24 ART
From the router the is the ABR between area 0 and nssa area 5, I see that
the routing table shows that the same route advertised from area 0 as type
E1 and from nssa area 5 as type nssa 1 , the nssa1 route from nssa area 5
is prefered and put in the routing table. I thought route type E1 is
preferred over nssa1. There is a ospf order IntraArea, Interarea, E1 and
E2, however I can't find anything regarding OSPF preference for NSSA1 or 2
compare to Intra area, Interarea, E1 and E2 routes.
On 8/8/07, Herbert Maosa <asawilunda@googlemail.com> wrote:
>
> 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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