On page 9, table 1 you list Allstream as being "was Bell Canada." They were the network formerly known as AT&T Canada. ---Mike At 02:16 PM 24/11/2003, todd@renesys.com wrote:

Folx,

Hot off the presses, from the people who brought you the excellent (and fun!) reports on the effects of worms on routing instabilities, how the Internet fared on Sept 11, 2001, and other fine topics of interest to the operator community, comes a new report:

"Impact of the 2003 Blackouts on Internet Communications" available now at: http://www.renesys.com/news/index.html <a href="http://www.renesys.com/news/index.html">here</a>

It is an attempt to do a thorough, retrospective analysis of the impact of the power outages from a purely routing perspective. We tried to be quite rigorous in our methodology and careful in our inferences. However, we came to what may be an unpopular conclusion: the Internet fared worse than others have previously reported. The main difference in our conclusions lies in different measurement strategies (core to core layer 3-4 monitoring versus global BGP routing monitoring). Read the paper for more information.

We also hoped to produce a definitive analysis of the network (routing, BGP) impact of the power outages so that others can compare future events.

We're particularly interested in feedback from operators with assets in the affected regions of the US, Canada and Italy (see Appendix B for a good comparison of the Sept 28 Italy Blackout with the Aug 14 US Blackout).

A few specific ASes are mentioned in the report. We would love to hear feedback from those ASes or others who were affected to learn more about the backstory behind the outage. If your prefixes stayed up, why? If some went down and some didn't, what caused that? Did your upstreams and peers stay up? Were local power outages at routers the primary cause of outages, or did other factors enter into the equation? We saw one AS with nine (9!) upstream ASes lose all of it's prefixes. Could it be that someone with 9 upstream adjacencies didn't have reliable power?

These questions, plus a general discussion of Internet edge reliability (power and interconnectedness) seem on-topic for the list.

Of course, we read nanog :-), so we'd love to see those stories discussed here in a context that would help all of us understand the causes and mitigation strategies better, but private mail will also be gratefully accepted. If you don't ever want us to mention your name in public, be sure to let us know.

Todd Underwood todd@renesys.com