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Re: BGP AS Sets in the wild

  • From: chip
  • Date: Tue Aug 23 10:00:26 2005
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On 8/23/05, Iljitsch van Beijnum <[email protected]> wrote:
> 
> On 23-aug-2005, at 12:36, Abhishek Verma wrote:
> 
> > 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?
> 
> > Is this the case?
> 
> I guess they aren't.
> 
> > I am under the impression that AS_SETs are generated whenever there
> > are some routes that are aggregated.
> 
> Yes, but aggregation in the BGP protocol is a relic from the BGP3-to-
> BGP4 transition, AFAIK it's rarely used these days.
> 

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-aggregate
      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-aggregate
  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

-- 
Just my $.02, your mileage may vary,  batteries not included, etc....