why not AS number based prefixes aggregation

Jeroen Massar jeroen at unfix.org
Mon Sep 8 10:36:39 CDT 2008

Christopher Morrow wrote:
> On Mon, Sep 8, 2008 at 9:20 AM, yangyang. wang <wyystar at gmail.com> 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.
> you might look at LISP, which is sort of like 'route by asn', with
> some other benefits added as well.
> <http://www.nanog.org/mtg-0706/Presentations/lightning-farinacci.pdf>

NANOG site changed, thus that is now:


Also check http://www.lisp4.net/ as they are actually testing this in
live environments :)


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