North American Network Operators Group
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Re: why not AS number based prefixes aggregation

  • From: Christopher Morrow
  • Date: Mon Sep 08 11:30:56 2008 
On Mon, Sep 8, 2008 at 9:20 AM, yangyang. wang <[email protected]> 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