why not AS number based prefixes aggregation

Boyd, Benjamin R Benjamin.R.Boyd at windstream.com
Mon Sep 8 14:49:34 CDT 2008

>-----Original Message-----
>From: Paul Francis [mailto:francis at cs.cornell.edu] 
>Sent: Monday, September 08, 2008 2:31 PM
>To: Ricardo Oliveira; nanog at merit.edu
>Subject: RE: why not AS number based prefixes aggregation
>This thread begs an interesting question:  what is the right 
>amount of granularity for load balance?  Folks here are saying 
>that one-entry-per-AS is too course...an AS wants to influence 
>load on incoming links, and so it needs multiple entries.
>On the other hand, it is hard to imagine that we need hundreds 
>of entries per AS, or even dozens.  So I'm curious...if we 
>could wave a magic wand and control the exact number of 
>entries any AS needs to advertise, what would folks consider 
>to be roughly the right number of entries?

Although hard to imagine, I would think that flexibility would be
desired for those willing to implement/manage it.


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