From: Peter van Oene (pvo@usermail.com)
Date: Wed Oct 16 2002 - 10:05:32 GMT-3
Keep in mind that you can't filter LSAs. You can filter routing
information as it moves from the LSDB to the local routing table, but not
the reception and publication of the LSAs to the LSDB. Filtering LSA
reception would directly violate the specifications and likely lead to
routing instability as SPF is only effective when everyone looks at the
same topology.
At 01:58 PM 10/16/2002 +0100, Senthil Kumar wrote:
>true, but what if you want to filter some lsa-3 only..distribute list might
>help when introduced on inbound routes at all peers.wont it?
>
>-----Original Message-----
>From: Peter van Oene [mailto:pvo@usermail.com]
>Sent: 16 October 2002 13:36
>To: Dimitris Vassilopoulos; ccielab@groupstudy.com
>Subject: Re: Filtering OSPF LSA type 3
>
>
>All you can do here is use the totally stubby knob on the ABR(s). Once the
>LSA is in the area, it is mandatory that all area resident routers receive
>the LSA and correctly process it. Distribute-list in simply prevents any
>relevant reachability information from making it to the local routing
>table, but has no effect on LSA's.
>
>At 01:35 PM 10/16/2002 +0300, Dimitris Vassilopoulos wrote:
> >Team,
> >
> >Cisco says in
> >http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122newft/12
>2t/122t4/ftabrt3f.htm
> >
> >that if you want to filter OSPF type 3 LSA you have to run 12.2(4)T.
> >I know that the image running in the lab is 12.1.x
> >
> >What if we're asked to filter inbound type 3 LSAs from a BB router?
> >We must use " distribute-list x in " in EVERY ospf router ?
> >
> >Any comment on that would be appreciated...
> >
> >Dimitris
>
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