[63878] in North American Network Operators' Group
Re: BellSouth prefix deaggregation (was: as6198 aggregation event)
daemon@ATHENA.MIT.EDU (Stephen J. Wilcox)
Sun Oct 12 09:03:52 2003
Date: Sun, 12 Oct 2003 13:02:57 +0000 (GMT)
From: "Stephen J. Wilcox" <steve@telecomplete.co.uk>
To: Terry Baranski <tbaranski@mail.com>
Cc: 'James Cowie' <cowie@renesys.com>, <nanog@merit.edu>
In-Reply-To: <000001c39080$583667c0$0200000a@netsec.net>
Errors-To: owner-nanog-outgoing@merit.edu
> Can anyone from BellSouth comment? What if a few other major ISPs were
> to add a thousand or so deaggregated routes in a few weeks time? Would
> there be a greater impact?
one word - irresponsible
Steve
>
> (Note: The above numbers are based on data from cidr-report.org. Some
> other looking glasses were also checked to see if cidr-report.org's view
> of these AS's is consistent with the Internet as a whole. This appears
> to be the case, but corrections are welcome.)
>
> -Terry
>
> > -----Original Message-----
> > From: owner-nanog@merit.edu [mailto:owner-nanog@merit.edu] On
> > Behalf Of Terry Baranski
> > Sent: Sunday, October 05, 2003 3:01 PM
> > To: 'James Cowie'; nanog@merit.edu
> > Subject: RE: as6198 aggregation event
> >
> >
> >
> > James Cowie wrote:
> >
> > > On Friday, we noted with some interest the appearance of more
> > > than six hundred deaggregated /24s into the global routing
> > > tables. More unusually, they're still in there this morning.
> > >
> > > AS6198 (BellSouth Miami) seems to have been patiently injecting
> > > them over the course of several hours, between about 04:00 GMT
> > > and 08:00 GMT on Friday morning (3 Oct 2003).
> >
> > If you look at the 09/19 and 09/26 CIDR Reports, BellSouth Atlanta
> > (AS6197) did something similar during this time period -- they added
> > about 350 deaggregated prefixes, most if not all /24's.
> >
> > > Usually when we see deaggregations, they hit quickly and they
> > > disappear quickly; nice sharp vertical jumps in the table size.
> > > This event lasted for hours and, more importantly, the prefixes
> > > haven't come back out again, an unusual pattern for a single-origin
> > > change that effectively expanded global tables by half a percent.
> >
> > That AS6197's additions are still present isn't encouraging.
> >
> > -Terry
> >
>
>
