why not AS number based prefixes aggregation

Christopher Morrow morrowc.lists at gmail.com
Mon Sep 8 10:30:40 CDT 2008


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>

-Chris




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