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

10^6-1,

Do you have a link between R3 and SW1 that you forgot to mention ?
Cause if not, even though R3 lo is in "area 2", that would be "another"
area 2 compared to R3-SW1-R6.

-Carlos

ccie99999 @ 07/01/2013 01:41 -0300 dixit:
> hello everybody..
>
> I've decided to drop this question here in Gs since I'm confused and not
> able to understand this scenario.
>
> I would like to filter an OSPF intra-area route in this scenario.
>
>
> =============VL0===VL1=
> 22222222222211111444444
> R3 - SW1 - R6 - R1 - R3
>
> from R3 to R6 there is Area2
> from R6 to R1 there is Area1
> from R1 to R3 there is Area4
> R1, R3 and others are in Area0
> There is a VL between R6 to R1 and from R1 to R3
>
> R3 LO is on Area2.
> What I want to do is configure some filtering in R6 that allows me to reach
> R3 L0 through path R6->R1->R3
> Without filtering I reach R3 L0 via R6->SW1->R3 since it's an intra-area
> route.
> If I shut down the link between R6 and SW1 I can reach R3 L0 via
> R6->R1->R3 (this is an inter-area route and this means VLs are working)
> my requirement: I want to filter on R6 so I would prefer inter-area instead
> of intra-area.
> As far as I know I cannot use :
>
> - area x range command: since this filters type3 between areas
> - distribute-list: since I've to filter based on a source also and I cannot
> do with it
> - only valid solution looks using a route-map matching prefix-list and
> something else.
> - I've tried this solution matching prefix list R3 L0 and ip route-source
> and doesn't work
> - I've tried same as above but matching interface (interface between R3
> and SW1)
> - I've tried same as above but matching a tag but I don't understand how
> to tag a route 'out' with ospf.
>
>
> Is there something easier to filter this type 1 LSA into R6? Or to prefer
> inter area compared to intra ones?
>
> thanks
>
>
>

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