From: D.H. Williams (draythw@gmail.com)
Date: Wed Jul 05 2006 - 09:17:31 ART
Awesome list. I'm going to try a few of these out today (especially the
nssa techniques). I am extremely grateful for your professionalism and
knowledge in answering this and others questions. Very, very appreciative!
D
On 7/5/06, Petr Lapukhov <petr@internetworkexpert.com> wrote:
>
> So just to summarize what's been said, the techniques we may use
> to filter *External* routing information with OSPF:
>
> 1) Local router
>
> 1.1) distribute-list (per-interface, based on prefixes),
> 1.2) distribute-list with route-map ( match next-hop, tag,
> interface).
> Match next-hop didn't work with prefix-list though, just with
> ACL
> 1.3) Change cost/bandwidth in any way
>
> 2) Transit router, non-ABR
>
> 2.1) Change cost/bandwidth in any way
> 2.2) Max-metric lsa (similar to above)
>
> 3) Transit router, ABR
>
> 3.1) With NSSA "summary not-advertise", or change RID
> to influence translator election
> 3.1) Change cost/bandwidth in any way
> 3.3) Filter forward-address with NSSA and other cases,
> where FA is present (also, nssa suppress-fa may help here)
>
> There are also a number of ways to use virtual links to influence routing
> decision, but this is getting complex already :)
>
> I can drop few examples a bit later, just too loaded with work now :(
>
> HTH
> --
> Petr Lapukhov, CCIE #16379
> petr@internetworkexpert.com
>
> Internetwork Expert, Inc.
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