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Re: [RRG] yetAnotherProposal: AS-number forwarding





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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