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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- [RAM] TIDR using the IDENTIFIERS attribute JUAN-JOSE.ADAN
- Fraction of transit ASes going down? [Re: [RAM] T… Simon Leinen
- Re: Fraction of transit ASes going down? [Re: [RA… Ricardo V. Oliveira
- Re: Fraction of transit ASes going down? [Re: [RA… JUAN-JOSE.ADAN