Re: OSPF IA advertisements

This is just a problem I was thinking about. It drew exactly the kind of
discussion I was hoping it would draw. This is really not a problem I
currently have.

Thanks you for the thorough responses.

I wanted to see If there was a trick way like setting metric as in rip or
tagging as was suggested, but redacted due to the requirements. I will lab
it up an if I find anything interesting I will report back.

Thanks again,

Ed Vazquez

On Tuesday, July 2, 2013, Tony Singh wrote:

>
>
> Think the OP is asking why technically is it not possible to filter
> outbound from area 0 type 3 LSA's originating in area x being generated for
> area y on the ABR originator?
>
> Here's my take on it....the ABR takes the intra-area information from the
> rib then floods it to non-area 0 areas for stability purposes as a first,
> if you apply the filter-list on say another ABR that's adjacent then use
> the filter-list here it is possible to filter the intra-area inter-area
> information as the command applies after all summarisation is done
>
> So why not the oringinator is this just because IOS implementation is
> following the rules?
>
> --
> BR
>
> Tony
>
> Sent from my iPhone on 3
>
> On 2 Jul 2013, at 23:43, Marko Milivojevic <markom_at_ipexpert.com<javascript:;>>
> wrote:
>
> > That will work, yes, butb& he did ask about IA routes. I assume he wants
> to
> > keep them as such elsewhere, or maintain the integrity of the routing
> > domain as it is now.
> >
> > In any case - I think we need some more information.
> >
> > --
> > Marko Milivojevic - CCIE #18427 (SP R&S)
> > Senior CCIE Instructor / Managing Partner - IPexpert
> >
> >
> > On Tue, Jul 2, 2013 at 3:30 PM, Joe Sanchez <marco207p_at_gmail.com> wrote:
> >
> >> How about separate processes with redistribution and filtering there?
> >>
> >> Regards,
> >> Joe Sanchez
> >>
> >> ( please excuse the brevity of this email as it was sent via a mobile
> >> device. Please excuse misspelled words or sentence structure.)
> >>
> >> On Jul 2, 2013, at 3:34 PM, Carlos G Mendioroz <tron_at_huapi.ba.ar>
> wrote:
> >>
> >>> Yes, he said, but I assumed that was what described which routes he
> >> wanted to filter in a pre-filter environment.
> >>> Again, this is not doable inside the box, AFAIK.
> >>> -Carlos
> >>>
> >>> Marko Milivojevic @ 02/07/2013 17:26 -0300 dixit:
> >>>>
> >>>> I think he explicitly asked about the inter-area routes, so I wasn't
> >>>> even thinking about the externals. I don't think you can set the tags
> on
> >>>> internal or inter-area.
> >>>>
> >>>> --
> >>>> Marko Milivojevic - CCIE #18427 (SP R&S)
> >>>> Senior CCIE Instructor / Managing Partner - IPexpert
> >>>>
> >>>>
> >>>> On Tue, Jul 2, 2013 at 12:02 PM, Carlos G Mendioroz <tron_at_huapi.ba.ar
> >>>> <mailto:tron_at_huapi.ba.ar>> wrote:
> >>>>
> >>>> Redistributing and setting external tags, I guess.
> >>>> I did not think about the details, as I was more concerned with
> >>>> showing that the requested functionality was impossible without
> >>>> going outside the box, so to say...
> >>>>
> >>>> -Carlos
> >>>>
> >>>> Marko Milivojevic @ 02/07/2013 15:19 -0300 dixit:
> >>>>
> >>>>
> >>>> He could do it with prefix-lists, but that's not very scalable.
> >>>>
> >>>> How would you tag inter-area routes though?
> >>>>
> >>>> --
> >>>> Marko Milivojevic - CCIE #18427 (SP R&S)
> >>>> Senior CCIE Instructor / Managing Partner - IPexpert
> >>>>
> >>>>
> >>>> On Tue, Jul 2, 2013 at 11:14 AM, Carlos G Mendioroz
> >>>> <tron_at_huapi.ba.ar <mailto:tron_at_huapi.ba.ar>
> >>>> <mailto:tron_at_huapi.ba.ar <mailto:tron_at_huapi.ba.ar>>> wrote:
> >>>>
> >>>> Eduardo,
> >>>> once the LSAs are in area 0, there is no memory of them
> >>>> coming from
> >>>> area (say) 10. So if I understand your request correctly,
> >>>> there is
> >>>> no "native" ospf way of doing this.
> >>>>
> >>>> On the other hand, you could tag your routes with the area
> >>>> it came
> >>>> from at the ABRs, and filter based on those tags (also on
> >>>> ABRs).
> >>>>
> >>>> -Carlos
> >>>>
> >>>> Eduardo Vazquez @ 02/07/2013 06:57 -0300 dixit:

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Received on Tue Jul 02 2013 - 19:53:14 ART