From: Brian McGahan (brian@cyscoexpert.com)
Date: Mon Sep 16 2002 - 16:54:03 GMT-3
Peter,
"distribute-list" under OSPF serves two purposes:
1. To prevent a prefix in the OSPF database from appearing in the IP
routing table (distribute-list in)
2. To filter redistribution of protocols on your ASBR (distribute-list
out)
See the following links for more info:
http://www.cisco.com/warp/public/104/3.html
http://www.cisco.com/warp/public/104/26.html#7
HTH
Brian McGahan, CCIE #8593
Director of Design and Implementation
brian@cyscoexpert.com
CyscoExpert Corporation
Internetwork Consulting & Training
http://www.cyscoexpert.com
Voice: 847.674.3392
Fax: 847.674.2625
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> Peter Kikic/EIG
> Sent: Monday, September 16, 2002 2:16 PM
> To: ccielab@groupstudy.com
> Subject: Filtering OSPF E2's
>
> I am using Hutnik and Satterlee's CCIE Lab Practice Kit (OSPF). One
of
> the requirements of the OSPF lab is to filter certain routes from
showing
> up in all downstream router's databases. The solution provided in
the
> book uses distribute-list in to prevent the routes from being added
to
> each downstream router's database. The routes were external type 2
> routes
> (E2 in the routing table) which were redistributed via redistribution
of
> connected routes.
>
> After a little research I found examples of the following:
>
> 1. Documentation supporting the use of distribute-list in OSPF under
any
> circumstance
> 2. Documentation supporting the use of distribute-list in OSPF only
when
> filtering intraarea and interarea routes (O and IA) and not
externals.
> 3. Documentatoin supporting the fact that distribute-list in does
not
> work well in OSPF and is not really supported.
>
> Does anyone have a definitive answer on when distribute-list in can be
> used
> in OSPF? I am using various flavours of IOS 12.1.
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