[112485] in North American Network Operators' Group

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Re: 23456 without AS4_PATH?

daemon@ATHENA.MIT.EDU (sthaug@nethelp.no)
Sat Feb 28 08:52:41 2009

Date: Sat, 28 Feb 2009 14:52:30 +0100 (CET)
To: saku+nanog@ytti.fi
From: sthaug@nethelp.no
In-Reply-To: <20090228132412.GA5615@mx.ytti.net>
Cc: nanog@nanog.org
Errors-To: nanog-bounces@nanog.org

> Anyone else seeing this:
> *> 91.196.186.0/24  62.237.167.25                          0 3292 3549 15703 43531 23456 i
> 
> http://www.ietf.org/rfc/rfc4893.txt
> 6.  Transition
>    An OLD BGP speaker MUST NOT use AS_TRANS as its Autonomous System
>    number.

Seeing it here too. On our 4-byte capable routers:

91.196.186.0/24    *[BGP/170] 1d 13:36:53, MED 0, localpref 105, from 193.75.0.204
                      AS path: 16150 15703 43531 AS_TRANS I
                      AS path: 3356 6461 15703 43531 AS_TRANS I
                      AS path: 1299 3549 15703 43531 AS_TRANS I

And on our non 4-byte capable routers it is simply shown as 23456. This
ASN should not be used to originate prefixes, agreed.

Steinar Haug, Nethelp consulting, sthaug@nethelp.no

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