[83739] in North American Network Operators' Group
Re: BGP AS Sets in the wild
daemon@ATHENA.MIT.EDU (chip)
Tue Aug 23 09:59:37 2005
Date: Tue, 23 Aug 2005 09:59:10 -0400
From: chip <chip.gwyn@gmail.com>
To: nanog@nanog.org
Cc: Abhishek Verma <abhishekv.verma@gmail.com>,
Iljitsch van Beijnum <iljitsch@muada.com>
In-Reply-To: <B21F0309-9078-4188-89BC-84B4B6D41AB1@muada.com>
Errors-To: owner-nanog@merit.edu
On 8/23/05, Iljitsch van Beijnum <iljitsch@muada.com> wrote:
>=20
> On 23-aug-2005, at 12:36, Abhishek Verma wrote:
>=20
> > I was looking at route-views.routeviews.org for the BGP routes and i
> > dont see any AS-Sets whatsoever. Are BGP routes with AS-SETs not
> > generally leaked into the wild?
>=20
> > Is this the case?
>=20
> I guess they aren't.
>=20
> > I am under the impression that AS_SETs are generated whenever there
> > are some routes that are aggregated.
>=20
> Yes, but aggregation in the BGP protocol is a relic from the BGP3-to-
> BGP4 transition, AFAIK it's rarely used these days.
>=20
Sure there are...
route-views.oregon-ix.net>sho ip bgp 24.223.128.0/17
BGP routing table entry for 24.223.128.0/17, version 1030251
Paths: (47 available, best #20, table Default-IP-Routing-Table)
Not advertised to any peer
2914 1668 10796 {11060,12262}, (aggregated by 10796 24.95.80.203)
129.250.0.11 from 129.250.0.11 (129.250.0.88)
Origin IGP, metric 1, localpref 100, valid, external, atomic-aggregat=
e
Community: 2914:420 2914:2000 2914:3000 65504:1668
11608 2914 1668 10796 {11060,12262}, (aggregated by 10796 24.95.80.203)
207.246.129.6 from 207.246.129.6 (207.246.155.208)
Origin IGP, localpref 100, valid, external, atomic-aggregate
Community: 2914:420 2914:2000 2914:3000 11608:801 11608:1004
11608:5501 65504:1668
6079 1668 10796 {11060,12262}, (aggregated by 10796 24.95.80.203)
207.172.6.162 from 207.172.6.162 (207.172.6.162)
Origin IGP, metric 0, localpref 100, valid, external, atomic-aggregat=
e
11608 3491 1668 10796 {11060,12262}, (aggregated by 10796 24.95.80.203)
207.246.129.14 from 207.246.129.14 (207.246.129.14)
Origin IGP, localpref 100, valid, external, atomic-aggregate
Community: 11608:1006 11608:550
--chip
--=20
Just my $.02, your mileage may vary, batteries not included, etc....
