why not AS number based prefixes aggregation

Ricardo Oliveira rveloso at cs.ucla.edu
Mon Sep 8 12:10:58 CDT 2008


Topological aggregation based on ASN is often too course granularity,  
see this paper:
http://www.cs.ucla.edu/~rveloso/papers/giro.pdf
specifically Fig4 is a good example, and sec 4C.
Cheers,

--Ricardo

On Sep 8, 2008, at 6:20 AM, yangyang. wang 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.
>
>
> -yang





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