[171425] in North American Network Operators' Group
Re: We hit half-million: The Cidr Report
daemon@ATHENA.MIT.EDU (Geoff Huston)
Tue Apr 29 03:31:44 2014
X-Original-To: nanog@nanog.org
From: Geoff Huston <gih@apnic.net>
In-Reply-To: <3883.1398739149@turing-police.cc.vt.edu>
Date: Tue, 29 Apr 2014 17:31:31 +1000
To: <Valdis.Kletnieks@vt.edu>
Cc: NANOG list <nanog@nanog.org>
Errors-To: nanog-bounces@nanog.org
On 29 Apr 2014, at 12:39 pm, Valdis.Kletnieks@vt.edu wrote:
> On Mon, 28 Apr 2014 21:59:43 -0400, "Patrick W. Gilmore" said:
>>> On Apr 28, 2014, at 19:41, Chris Boyd <cboyd@gizmopartners.com> =
wrote:
>>> I'm in the middle of a physical move. I promise I'll take the 3 =
deagg'd
>>> /24s out as soon as I can.
>> Do not laugh. If everyone who had 3 de-agg'ed prefixes fixed it, the =
table
>> would drop precipitously. We all have to do our part.
>=20
> Do we have a handle on what percent of the de-aggrs are legitimate =
attempts
> at TE, and what percent are just whoopsies that should be =
re-aggregated?
>=20
I made a shot at such a number in a presentation to NANOG in Feb this =
year
(http://www.potaroo.net/presentations/2014-02-09-bgp2013.pdf)
If you assume that Traffic Engineering more specifics share a common =
origin AS with the
covering aggregate, then around 26% of more specifics are TE =
advertisements. This=20
number (as a percentage) has gwon by 5% over the past three years
If you assume that Hole Punching more specifics are more specifics that =
use a different
origin AS, then these account for 30% of the more specifics in today's =
routing table.
This number has fallen by 5% over the past three years.
The remainder of the prefixes (45%) shares the same origin AS and the =
same path.
The could be TE prefixes, but as they are identical to their covering
aggregate its hard to appreciate exactly what the engineering intent may =
be. I could
make a wild guess and call these 45% of more specifics to be an act of =
senseless routing
vandalism. ( :-) ) This number has been steady as a % for the past three =
years.
Interestingly, it's the hole punching more specifics that are less =
stable, and the
senseless routing vandalism more specifics that are more stable than the =
average.
thanks,
Geoff=
