[107620] in North American Network Operators' Group
Re: why not AS number based prefixes aggregation
daemon@ATHENA.MIT.EDU (Ricardo Oliveira)
Mon Sep 8 13:11:14 2008
In-Reply-To: <10fbbf5a0809080620t63cfac5fh1f62e7c2926e39d9@mail.gmail.com>
From: Ricardo Oliveira <rveloso@cs.ucla.edu>
Date: Mon, 8 Sep 2008 10:10:58 -0700
To: nanog@merit.edu
Errors-To: nanog-bounces@nanog.org
Topological aggregation based on ASN is often too course granularity,
see this paper:
http://www.cs.ucla.edu/~rveloso/papers/giro.pdf
specifically Fig4 is a good example, and sec 4C.
Cheers,
--Ricardo
On Sep 8, 2008, at 6:20 AM, yangyang. wang wrote:
> Hi, everyone:
>
> For routing scalability issues, I have a question: why not
> deploy AS
> number based routing scheme? BGP is path vector protocol and the
> shortest
> paths are calculated based on traversed AS numbers. The prefixes in
> the same
> AS almost have the same AS_PATH associated, and aggregating prefixes
> according to AS will shrink BGP routing table significantly. I
> don't know
> what comments the ISPs make on this kind of routing scheme.
>
>
> -yang
