From: Mark, Detrick (mdetrick@xxxxxxxxx)
Date: Fri Jul 23 1999 - 14:10:59 GMT-3
Pamela is right in that LS routing protos can't be filtered the way that DV
can be. The routes in OSPF are calculated by SPF from LSA and no routes are
transferred amoung routers in the area at any time. However, I think with
distribute-list you can filter routes that are calculated by OSPF and then
put INto the table. This is only effective on the local router, therefore,
to eliminate a route from all routers in an OSPF area you would have to put
this statement on all the routers. The LSAs would not be effected.
Mark Detrick
DSL Business Unit
Cisco Systems
2569 McCabe Way
Irvine, CA 92614
----- Original Message -----
From: Ron Trunk <rtrunk@xatlantic.com>
To: <ccielab@groupstudy.com>
Sent: Friday, July 23, 1999 8:07 AM
Subject: Re: Redist dist-list problems
> Pamela,
>
>
>
> >What the statement,
> > distribute-list 10 out ospf 1
> >under the RIP configuration says is, "for all routes being imported into
> >RIP from OSPF, filter them according to list 10." If list 10 is denying
> >network 12.0.0.0, then network 12.0.0.0 is not coming into RIP from OSPF.
> >I promise you, this is the way it works.
> >
>
> I think we said the same thing only worded differently.
>
> >Bill, you need to put the distribute-list statement under OSPF instead of
> >RIP, and it needs to be,
> > distribute-list 10 out rip
> >
> >What this says is, "for all routes being imported into OSPF from RIP,
> >filter according to list 10."
>
> >
> >The "distribute-list in <interface>" doesn't work for OSPF at all. This
> >form is used ONLY with the distance-vector protocols. You can't filter
> >link-state protocols at an interface.
>
>
> Don't you mean distribute-list OUT <interface> doesn't work for OSPF?
> I understand that one, since OSPF advertises from its topology database,
not
> the routing table.
> But why wouldn't IN work? How else would you filter routes coming in from
> another domain?
>
>
> Ron
>
>
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