[44818] in North American Network Operators' Group
AS 701 local-pref answer.
daemon@ATHENA.MIT.EDU (David Barak)
Sun Dec 16 20:29:06 2001
Message-ID: <20011217012830.3887.qmail@web14914.mail.yahoo.com>
Date: Sun, 16 Dec 2001 17:28:30 -0800 (PST)
From: David Barak <thegameiam@yahoo.com>
To: nanog@merit.edu
Cc: mleber@he.net, smentzer@mentzer.org, rekoil@semihuman.com,
gmartine@nic.gip.net
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Errors-To: owner-nanog-outgoing@merit.edu
Mike Leber wrote:
>If they set local pref for both peers and customers
>to 100 how do they
>ensure that the customer transit routes are
>announced to peers?
>The reason I ask this is because if a customer
>announces a customer of
>theirs to you that a peer also has as a customer >you
will have equal
>length routes for the same destination AS. While
>there are many ways to
>deterministicly prefer customer routes, local pref
>is the most common.
AS 701 always announces the best route, as their
routers know it. Their average AS-path length is
under 2, so it doesn't seem to be a problem. If a
customer of AS 701 wants to insure that his/her route
is advertised in all cases, s/he could send a
community which AS701 edge devices could use to
manipulate local-preference upward. [this was covered
in a previous posting on this topic] I leave it to
your imagination whether peers would be permitted to
do this.
-David Barak
I only speak for myself.
"Quis custodes ipsos custodiet?" - Juvenal
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