From: Peter van Oene (pvo@usermail.com)
Date: Wed Oct 16 2002 - 10:30:41 GMT-3
Exactly,
But keep in mind that filtering the reception of LSAs is not a good
thing. If you happen to have a requirement for this, you should likely
reconsider your design as there is probably a better way to attack things
than breaking your routing protocol ;-)
Pete
At 02:26 PM 10/16/2002 +0100, Senthil Kumar wrote:
>makes good sense.. we cant as of now..unless we face the routers in opposite
>direction ..
>
>-----Original Message-----
>From: Peter van Oene [mailto:pvo@usermail.com]
>Sent: 16 October 2002 14:17
>To: Senthil Kumar
>Cc: ccielab@groupstudy.com
>Subject: RE: Filtering OSPF LSA type 3
>
>
>You can filter the _generation_ of type 3 LSA's on the originating ABR, but
>you can't filter the reception of LSA's.
>
>At 02:12 PM 10/16/2002 +0100, you wrote:
> >you can filter lsa's with ospf filter-list
> >
> >-----Original Message-----
> >From: Peter van Oene [mailto:pvo@usermail.com]
> >Sent: 16 October 2002 14:06
> >To: Senthil Kumar; Dimitris Vassilopoulos; ccielab@groupstudy.com
> >Subject: RE: Filtering OSPF LSA type 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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