Heads up: Long AS-sets announced in the next few days

What exactly are you attempting to do here? Those announcements will get 
dropped on the floor at least in this AS right away:

route-map peers-in deny 5
  match as-path 109

ip as-path access-list 109 permit ^[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+_[0-9]+

How does announcing ridiculously long as-paths help anyone, if anything we 
should be educating people that childishly long chains of prepends will 
not do what they want (presumably make more of a difference in traffic 
flows, which isn't going to work beyond a small number of prepends, as 
whats left is people localpreffing).

James



On Tue, 1 Mar 2005, Lorenzo Colitti wrote:

> Hi,
>
> as announced to the RIPE routing working group mailing list [1] and 
> elsewhere, over the next few days the Computer Networks research group at 
> Roma Tre University, in collaboration with the RIPE NCC RIS project, will be 
> performing experiments involving announcements with large AS-sets in the 
> AS-path. We are doing this to test innovative network discovery methodologies 
> we developed to allow ISPs to determine how their prefixes are seen by the 
> rest of the Internet. The announcements will be for prefixes 84.205.73.0/24 
> and 84.205.89.0/24 and will originate in AS12654.
>
> We have been performing similar experiments over IPv6, in collaboration with 
> the NAMEX internet exchange, since December 2004 with no ill effects; 
> furthermore, our announcements are standard BGP, so conformant 
> implementations should be able to process them, and very long AS-sets have 
> already been observed in the past (e.g. [2], [3]). However, we want to be 
> careful to avoid router bugs on legacy devices, old firmware versions and the 
> like, so we are first sending out test announcements with progressively 
> longer AS-sets. Should you encounter a problem with these advertisements, 
> please let us know and we will withdraw them.
>
> The proposed timetable of the test announcements is as follows.
>
> 2005-03-04:
> 	14:00 UTC: 10-element AS-set
> 	14:30 UTC: withdrawal
> 	16:00 UTC: 25-element AS-set
> 	16:30 UTC: withdrawal
>
> and, if there are no problems:
>
> 2005-03-07:
> 	14:00 UTC: 50-element AS-set
> 	14:30 UTC: withdrawal
> 	16:00 UTC: 100-element AS-set
> 	16:30 UTC: withdrawal
>
> Note: For reference, the AS-sets already observed in [2] and [3] contained 
> 123 and 124 ASes respectively.
>
>
> For questions/comments, please contact compunet at dia.uniroma3.it or 
> lorenzo at ripe.net.
>
>
> Regards,
> Lorenzo Colitti
> On behalf of the Roma Tre Computer Networks Research group
>
> [1] http://www.ripe.net/ripe/maillists/archives/routing-wg/2005/msg00021.html
> [2] http://www.ripe.net/projects/ris/Talks/0101_RIPE38_AA/sld003.html
> [3] http://www.ripe.net/maillists/ncc-archives/ris-users/2002/msg00044.html
>
>