Re: Fraction of transit ASes going down? [Re: [RAM] TIDR using the IDENTIFIERS attribute]

JUAN-JOSE.ADAN@giss.seg-social.es Fri, 20 April 2007 09:51 UTC

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To: "Ricardo V. Oliveira" <rveloso@cs.ucla.edu>
Subject: Re: Fraction of transit ASes going down? [Re: [RAM] TIDR using the IDENTIFIERS attribute]
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Ricardo, Simon:

Thank you for your comments. Please see below.

"Ricardo V. Oliveira" <rveloso@cs.ucla.edu> wrote on 19/04/2007 21:17:44:

> Yes, our measurements also confirm Simon numbers. Roughly speaking, 
> about 1/3 of ASes are transit, but they originate 2/3 of the prefixes.
> 
> --Ricardo
> 
> On Apr 19, 2007, at 8:08 AM, Simon Leinen wrote:
> 
> >
> > I wrote a quick Perl script (attached) and ran it on the AS1239 files.
> > The results suggest that the ratio of transit (-only and mixed) ASes
> > to total has remained pretty stable over the past years (modulo a
> > dot-com-bubble/burst bump :-).  According to this definition, the
> > ratio is more like 29%, not the 1/6 you claim.

The last RIS Statistics Report provided by RIPE
(http://www.ris.ripe.net/weekly-report/reports/20070409-20070416.html)
shows the following: 

Distribution of AS number wrt Leaf, Transit. 

                 RIS     rrc00   rrc01   rrc02   rrc03   rrc04   rrc05 
Leaf           21120     21197   21132    5012   21153   19944   21252 
Transit         4122      3971    3900     522    3916    3518    3801 
Transit-only     142       136     133     963     133     193     132 
Total          25384     25304   25165    6497   25202   23655   25185 


If we take the first column we have:

25384 / (4122 + 142) = 5.95

Therefore, roughly speaking, transit AS-es are 1/6 of the total.

> > Maybe your definition of a transit AS differs from Geoff's?
> > -- 
> > Simon.

I think this definition is the same for all of us, isn't it?.
Am I missing something?.

At first sight one should think that 1/3 are too many transit AS-es
but reality always has the last word.

Regards,
Juanjo
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