AS-set results, new experiments 30/06/2005

Fri Jun 24 15:25:28 UTC 2005

Hi,

we have posted preliminary results of our long AS-set announcements to
our web site:

http://www.dia.uniroma3.it/~compunet/bgp-probing/diffusion.html

While we are still working on an in-depth analysis, the results indicate 
that while the presence or absence of an AS-set in an announcement does 
have an effect on its propagation, the length of the AS-set, if present, 
does not have a significant effect.

We would also like to move forward with further announcements to 
determine the effectiveness of our topology discovery algorithms in the 
IPv4 network. The algorithms, described in our posting a few weeks ago 
[1] and on the project's web page [2], make use of announcements 
involving the AS numbers of other ASes to allow ISPs to discover how 
their announcements can be propagated and how the policies of other ASes 
in the Internet affect their prefixes.

The extensive tests we have performed on the global IPv6 Internet show 
that our algorithms are effective, but we would like to see how 
effective they are on the IPv4 Internet given the different operational 
  practices in use. Therefore, starting on Thursday 30 June at 14:00 UTC 
the prefixes 84.205.73.0/24 and 84.205.89.0/24 will be announced with 
AS-paths of the form 12654 {...} where the AS-set contains the numbers 
of neighboring ASes.

The announcements will not last more than a few days; as before, should 
anyone see any problems, please contact me and I will take immediate 
action. Finally, our tests show that our announcements cause no 
technical problems; however, if anyone would prefer their AS number not 
to appear in the AS-sets, and feels that filtering our prefixes is not 
sufficient, please contact me and we will not use them.

Regards,
Lorenzo

[1] http://www.merit.edu/mail.archives/nanog/msg08501.html
[2] http://www.dia.uniroma3.it/~compunet/bgp-probing/

-- 
lorenzo at ripe.net                  colitti at dia.uniroma3.it
www.ripe.net                www.dia.uniroma3.it/~compunet
RIPE NCC        Roma Tre Computer Networks research group