[195117] in North American Network Operators' Group
Re: Long AS Path
daemon@ATHENA.MIT.EDU (Jakob Heitz (jheitz))
Thu Jun 22 10:52:19 2017
X-Original-To: nanog@nanog.org
From: "Jakob Heitz (jheitz)" <jheitz@cisco.com>
To: "nanog@nanog.org" <nanog@nanog.org>
Date: Thu, 22 Jun 2017 14:52:11 +0000
In-Reply-To: <mailman.1.1498046401.12158.nanog@nanog.org>
Errors-To: nanog-bounces@nanog.org
23456 is AS_TRANS. Either your router does not support 4 byte AS or there i=
s a bug at AS 12956 or AS 12956 is intentionally prepending 23456.
Thanks,
Jakob.
>=20
> Date: Tue, 20 Jun 2017 23:12:45 +0000
> From: James Braunegg <james.braunegg@micron21.com>
> To: "nanog@nanog.org" <nanog@nanog.org>
> Subject: Long AS Path
> Message-ID: <e679487be750411a874b7376a7037aa9@EX-01.m21.local>
> Content-Type: text/plain; charset=3D"us-ascii"
>=20
> Dear All
>=20
> Just wondering if anyone else saw this yesterday afternoon ?
>=20
> Jun 20 16:57:29:E:BGP: From Peer 38.X.X.X received Long AS_PATH=3D AS_SEQ=
(2) 174 12956 23456 23456 23456 23456 23456 23456 23456 23456 23456 23456 2=
3456 23456 23456 23456 23456 23456 23456 23456 23456 23456 23456 23456 2345=
6 23456 23456 23456 23456 23456 ... attribute length (567) More than config=
ured MAXAS-LIMIT
>=20
> Jun 20 16:15:26:E:BGP: From Peer 78.X.X.X received Long AS_PATH=3D AS_SEQ=
(2) 5580 3257 12956 23456 23456 23456 23456 23456 23456 23456 23456 23456 2=
3456 23456 23456 23456 23456 23456 23456 23456 23456 23456 23456 23456 2345=
6 23456 23456 23456 23456 23456 ... attribute length (568) More than config=
ured MAXAS-LIMIT
>=20
> Someone is having fun, creating weird and wonderful long AS paths based a=
round AS 23456, we saw the same pattern of data from numerous upstream prov=
iders.
>=20
> Kindest Regards,
>=20
> James Braunegg
>=20
>=20
