Re: OSPF distribute list - Lab study

From: Thameem Maranveetil Parambath (tparamba@thecontactcentre.ae)
Date: Mon Mar 09 2009 - 02:18:18 ARST

>>> you CAN configure it on an ABR to filter out external routes ONLY if
the area is
>>> configured as an NSSA.

Narbik,

Why would you filter external routes through distribute-list out in ABR of
NSSA? You could do it on the ASBR itself right?

Regards,
Thameem

Narbik Kocharians <narbikk@gmail.com>
Sent by: nobody@groupstudy.com
09/03/2009 03:42 AM
Please respond to
Narbik Kocharians <narbikk@gmail.com>

To
Scott Morris <smorris@internetworkexpert.com>
cc
Victor <cisco.all.stuff@gmail.com>, Cisco certification
<ccielab@groupstudy.com>, Cisco certification <cisco@groupstudy.com>
Subject
Re: OSPF distribute list - Lab study

Atlanta CCIE,

Distribute-out works in OSPF but ONLY on ASBR to filter external routes,
you
CAN configure it on an ABR to filter out external routes ONLY if the area
is
configured as an NSSA.

Hope this helps

On Sun, Mar 8, 2009 at 4:19 PM, Scott Morris
<smorris@internetworkexpert.com
> wrote:

> You can't do distribute-list out because the rules for OSPF (RFC) say
that
> everyone in an area must have an identical database. If you start
> filtering
> things selectively, you will violate that and likely cause the downfall
of
> humankind.
>
> It's entirely possible that someone did this and that's what has caused
the
> economic crisis of the world currently. Hmmmmm..
>
> ;)
>
> You can use an area-filter to filter BETWEEN areas if you so desire, but
> not
> within an area.
>
> HTH,
>
> Scott
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Victor
> Sent: Sunday, March 08, 2009 1:34 PM
> To: Cisco certification; Cisco certification
> Subject: OSPF distribute list - Lab study
>
> Hello
>
> A distribute list INBOUND in OSPF avoids the route from entering local
RIB
> but doesn't stop LSAs propagation. I tried to use a distribute list
> OUTBOUND
> and results are: routes still in IP routing table and still LSAs being
> propagated.
>
> Is there anyone than can explain me the effect of distribute list in
OSPF??
>
> Sorry if it seems an stupid question. Thanks in advance and Brgds.....
> Johan
>
>
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-- 
Narbik Kocharians
CCSI#30832, CCIE# 12410 (R&S, SP, Security)
www.MicronicsTraining.com
www.Net-Workbooks.com
Sr. Technical Instructor

Blogs and organic groups at http://www.ccie.net

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