[131990] in North American Network Operators' Group
re: AS path question.
daemon@ATHENA.MIT.EDU (Nick Olsen)
Wed Nov 10 15:35:58 2010
From: "Nick Olsen" <nick@brevardwireless.com>
To: "Greg Whynott" <Greg.Whynott@oicr.on.ca>
Date: Wed, 10 Nov 2010 15:31:58 -0500
Cc: nanog@nanog.org
Reply-To: nick@brevardwireless.com
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
They are prepending routes.
Looks like both 43022 are prepending, As well as 47359...Multiple times... =
They do this to make that route look "bad" so it comes in other transit the=
y have.
Nick Olsen
Network Operations
(855) FLSPEED x106
----------------------------------------
From: "Greg Whynott" <Greg.Whynott@oicr.on.ca>
Sent: Wednesday, November 10, 2010 3:23 PM
To: "nanog@nanog.org list" <nanog@nanog.org>
Subject: AS path question.
Recently I adjusted the maxas-limit option on our router, logs started r=
eporting routes being refused because the AS path is to long. seems to wo=
rk as expected.
when I looked at the logs I was a bit confused at what i was looking at... =
why is it there are multiple AS's in the path that appear to be the same =
AS? I expected an AS path comprised of mostly unique ASs.
instead of this:
476330: Nov 10 14:55:07.247 EDT: %BGP-6-ASPATH: Long AS path 549 26677 6939=
21011 43022 43022 43022 43022 43022 47359 47359 47359 47359 47359 47359 47=
359 47359 received from isp router: More than configured MAXAS-LIMIT
i expected it would look more like:
476330: Nov 10 14:55:07.247 EDT: %BGP-6-ASPATH: Long AS path 549 26677 6939=
21011 43022 47359 received from . .. .
thanks for your time again,
greg
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