Re: preferring OSPF inter-area compared to intra-area

I may be rusty, but I don't think that you can do it the way you think it.

In your thinking, you see the route like "flowing" from R3 to R6, when
in fact, it is there at R6 database. There is no "update" to filter.
(And OSPF depends on the database being the same at both routers!)

You can filter that route from getting into the RIB, but that is kinda
strong (i.e. you would need another protocol to get that route).
Or you can make the route not be intra area... may be by creating
another OSPF instance somewhere.

Or... something else I don't see, partly because I used 2 minutes to
think about it, partly because I'm missing context, partly because it's
just me :)

-Carlos

ccie99999 @ 07/01/2013 07:58 -0300 dixit:
> I've clear in my mind what I want to do but I don't understand how to do it
>
> R6 reaches R3 L0 since it's intra-area (Area2)
> R6 can also reach R3 L0 via R1 since there are couple of VLs, therefore
> inter-area.
> from R1 I can ping R3 L0
>
> I want to filter T1, T2 about R3 in R6. I don't think this is possible,
> but I could filter through a route-map filtering via prefix-list + ip
> source-route. Unluckly I'm able to get this working.
> If would be able to filter out this from my rib R6 should be able to see
> only R1 as valid path to R3.
>
> Is my thinking correct? Can I filter via a route-map, matching ip
> prefix-list and ip route-source and should this work?
>
> if so we can go ahead an see if my route-map is then wrong.
>
> thanks a lot Carlos!
>
>
>
> On Mon, Jan 7, 2013 at 10:27 AM, Carlos G Mendioroz <tron_at_huapi.ba.ar
> <mailto:tron_at_huapi.ba.ar>> wrote:
>
> Argh, I forgot to apply my talk to early supressors... now I see
> that R3 is twice in your diagram.
> OSPF needs same DB on all same area routers. So what are your
> extended requirements ? May be running 2 copies of OSPF at R3 ?
> Filtering that route from OSPF and running another proto ?
>
>
>
>
> --
> @ccie99999

-- 
Carlos G Mendioroz  <tron_at_huapi.ba.ar>  LW7 EQI  Argentina
Blogs and organic groups at http://www.ccie.net