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

JUAN-JOSE ADAN writes:
> (1) SCALABILITY OF THE ROUTING TABLE 
> We have several thousands of autonomous systems in the
> Internet, and we treat all of them in the same way whether
> they are transit or non-transit AS-es. But we shouldn´t
> forget that only 1/6 are transit AS-es. And most likely
> this fraction is decreasing over time (any figures?).

You could look at

http://bgp.potaroo.net/index-bgp.html

and, for one or three suitable ASes, check out the history files of
terminal, transit-only, and mixed ASes, e.g.:

http://bgp.potaroo.net/1239/bgp-as-term.txt
http://bgp.potaroo.net/1239/bgp-transit.txt
http://bgp.potaroo.net/1239/bgp-mixedas.txt

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.

: leinen@diotima[ram]; perl hack.pl | awk '{ print $6, $5 }' | uniq -1
30.85% 1998
31.87% 1999
27.96% 2000
28.73% 2001
28.15% 2002
27.07% 2003
27.84% 2004
28.68% 2005
28.50% 2006
29.14% 2007

(uniq -1 drops all but the first measurement for a given year, so
these are the respective ~January 1 numbers.)

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

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

Attachment: hack.pl