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Heads up: Long AS-sets announced in the next few days
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James A. T. Rice
james_r-ripelist at jump.org.uk
Wed Mar 2 02:27:31 CET 2005
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 > >
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