Re: [RRG] yetAnotherProposal: AS-number forwarding

[Geoff Huston <gih@apnic.net>]

Lixia Zhang wrote:
> On Mar 9, 2008, at 11:40 PM, Lars Westberg wrote:
>
> > Hi,
> > I haven't had time to make a draft but I think it make sense for the 
> > discussion. However, I don't know if it already have been discussed 
> > so....
> > The proposal are simple: re-use AS-numbers into the forwarding of 
> > packets such that prefixes could be aggregated per AS. One simple 
> > implemetation is that the packets are tunneled and that the 
> > tunnel-address is associated to a AS-number. The AS-numbers can be 
> > assigned to the IP-addresses by DNS or by define a small 
> > address-prefix to AS-numbers.
> > Comments?
> in an ideal world, yes having AS number as part of address used for 
> routing has great benefit.  see the slide from a talk in 2006 
> (http://www.cs.ucla.edu/~lixia/0612Australia.pdf, but ignoring the 
> title), slide 17 & 18 is about this.
> If we had a chance to influence address structure, you'd want to include 
> other info in addition to AS (as large ASes span large areas, TE would 
> want more info to do better job).
> we have another paper (http://www.cs.ucla.edu/~rveloso/papers/giro.pdf) 
> showing the benefit for including location info (which should be a 
> subfield after AS number)
And while we're having one of those historical moments:
http://www.caida.org/funding/routing/atoms/proposal/index.xml

Dunno how much all this helps the world other than illustrate (a) that 
AS-based routing is probably too coarse and you may want a finer level 
of granularity in terms of division of forwarding elements and (b) all 
of this is well covered ground.




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