[131991] in North American Network Operators' Group
Re: AS path question.
daemon@ATHENA.MIT.EDU (Greg Whynott)
Wed Nov 10 15:39:38 2010
From: Greg Whynott <Greg.Whynott@oicr.on.ca>
To: "nick@brevardwireless.com" <nick@brevardwireless.com>
Date: Wed, 10 Nov 2010 15:39:31 -0500
In-Reply-To: <1340f6c9$5916c7e9$4aaf3c88$@com>
Cc: "nanog@nanog.org" <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
thanks all, this makes sense now. and i just showed the internet how ig=
norant I am=85
i have my maxas-limit set to 10 based on an article I was reading. perhaps=
I should up that a bit.
what sort of problems are associated to overly long AS paths? is it more =
of a system resource control setting?
-g
On Nov 10, 2010, at 3:31 PM, Nick Olsen wrote:
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
[http://www.flhsi.com/files/emaillogo.jpg]
________________________________
From: "Greg Whynott" <Greg.Whynott@oicr.on.ca<mailto:Greg.Whynott@oicr.on.c=
a>>
Sent: Wednesday, November 10, 2010 3:23 PM
To: "nanog@nanog.org<mailto:nanog@nanog.org> list" <nanog@nanog.org<mailto:=
nanog@nanog.org>>
Subject: AS path question.
Recently I adjusted the maxas-limit option on our router, logs started repo=
rting routes being refused because the AS path is to long. seems to work 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 =85 .. .
thanks for your time again,
greg
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Gregory Whynott
Network Operations
Ontario Institute for Cancer Research
MaRS Centre, South Tower
101 College Street, Suite 800
Toronto, Ontario, Canada M5G 0A3
Tel: 647-294-2813
www.oicr.on.ca<http://www.oicr.on.ca/>
________________________________
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