[94176] in North American Network Operators' Group
Re: 4 Byte AS tested
daemon@ATHENA.MIT.EDU (Todd Underwood)
Thu Jan 11 13:02:45 2007
Date: Thu, 11 Jan 2007 12:59:30 -0500
From: Todd Underwood <todd-nanog@renesys.com>
To: Geoff Huston <gih@apnic.net>
Cc: nanog@merit.edu
In-Reply-To: <7.0.0.16.2.20070111201044.041aca30@apnic.net>
Errors-To: owner-nanog@merit.edu
all,
we (renesys) saw as23456 adjacent to both 1221 (expected) and 65001
(not), originating two prefixes:
203.10.62.0/24
and
203.10.63.0/24
paths looked like:
<peer> 7474 1221 65001 23456 23456 23456
and many similar
but also
<peer> ... 4637 1221 23456
and many similar
was the leak of the 65001 as intentional and part of the experiment, a
simple, error, or is there something useful to learn about the
difficulties of building filter lists with 4 byte ases?
t.
On Thu, Jan 11, 2007 at 08:14:14PM +1100, Geoff Huston wrote:
>
> # bgpctl show rib 203.10.62.0/24
> flags: * = Valid, > = Selected, I = via IBGP, A = Announced
> origin: i = IGP, e = EGP, ? = Incomplete
>
> flags destination gateway lpref med aspath origin
> *> 203.10.62.0/24 147.28.0.1 100 0 0.3130 0.1239
> 0.4637 0.4637 0.4637 0.4637 0.4637 0.4637 0.1221 1.202 i
>
>
> George Michaelson, Randy Bush and myself have successfully tested the
> implementation of 4Byte AS BGP on a public Internet transit. The
> above BGP RIB snapshot was taken at a 4Byte BGP speaker in North
> America, showing a transit path across AS 1221, AS 4637, AS 1239 and
> AS 3130 , with correct reconstruction of the originating AS at the
> other (4Byte AS) end.
>
> The code base used was OpenBGPD, with 4 byte patches that I've added
> to the code in the past couple of weeks.
>
> (Patched versions of openbgpd to include 4-byte AS support can be
> found at http://www.potaroo.net/tools/bgpd/)
>
> cheers,
>
> Geoff
>
>
>
--
_____________________________________________________________________
todd underwood +1 603 643 9300 x101
renesys corporation vp operations and professional svcs
todd@renesys.com http://www.renesys.com/blog/todd.shtml
