yo, savvis, cox, comcast, and armstrong! (Re: The Cidr Report)

Paul Vixie vixie at vix.com
Fri Jun 4 14:15:49 UTC 2004


cidr-report at potaroo.net writes:

> This report has been generated at Fri Jun  4 21:43:44 2004 AEST.
> ...
> Recent Table History
>         Date      Prefixes    CIDR Agg
> ...
>         03-06-04    137774       96139
>         04-06-04    137884       95196

ok, so in one day we saw the addition of 110 prefixes, but they were aligned
such that the size of a properly cidr-aggregated table dropped by 943.  this
is quite a trick.  what does it all mean?

> ...
> Aggregation Summary
> The algorithm used in this report proposes aggregation only
> when there is a precise match using the AS path, so as 
> to preserve traffic transit policies. Aggregation is also
> proposed across non-advertised address space ('holes').

and who's doing it?

> ASnum    NetsNow NetsAggr  NetGain   % Gain   Description
> 
> Table     136767    95172    41595    30.4%   All ASes
> 
> AS6347       940      160      780    83.0%   SAVV SAVVIS Communications
>                                                Corporation

yo, savvis!  you're putting 940 routes into the global routing table, and
when somebody did "sort -u" on the as-paths, they found that with no change
to your transit policies, you could be sending just 160 instead.  "help?"

> AS22909      390       33      357    91.5%   CMCS Comcast Cable
>                                                Communications, Inc.

yo, comcast!

> AS22773      378       58      320    84.7%   CXAB Cox Communications Inc.
>                                                Atlanta
> AS27364      360       44      316    87.8%   ARMC Armstrong Cable Services

yo, cox and armstrong!

> AS11172      351       56      295    84.0%   Servicios Alestra S.A de C.V
> AS17676      339       50      289    85.3%   JPNIC-JP-ASN-BLOCK Japan
>                                                Network Information Center
> AS9929       316       33      283    89.6%   CNCNET-CN China Netcom Corp.
> AS6478       305       48      257    84.3%   ATTW AT&T WorldNet Services
> AS25844      243       16      227    93.4%   SASMFL-2 Skadden, Arps, Slate,
>                                                Meagher & Flom LLP
> AS14654      230        5      225    97.8%   WAYPOR-3 Wayport
> AS6327       208       28      180    86.5%   SHAWC-2 Shaw Communications
>                                                Inc.

yo!  yo!  yo!  (i've only listed those who could reduce their impact on the
global routing table by 80% or more... as you all saw, the list *was* longer.)

there are any number of unemployed bgp experts haunting this mailing list
looking for post-dotbomb work.  many of them would accept work as short term
consultants to help you folks get down under the 80% level.  just ask!
-- 
Paul Vixie



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