Re: From: Todd Underwood <todd@renesys.com> to quote bobby dylan "you don't need a weatherman to know which way the wind blows." i.e., unless you were the president, the department of fatherland security, or fema, you probably knew there was a major disaster ongoing in nola and surrounds. if you could read the newpapers, you could even have known of it in advance. but, the geolocation stuff is cool. could it have told us, in an operationally useful/timely manner, that at&t had moved from new jersey to spain the other day?
1) the multi-hop issue is bogus, i believe. i'll ignore it unless randy chooses to say what he means here.
maybe use <http://nanog.org/mtg-0210/wang.html>. some siteseer entries seem a bit mangled, but [0] seems ok.
2) yes, indeed. we chose only to comment on changes in the routing table as changes in the routing table. inferences about unreachability of end interfaces is left entirely to the reader
but reachability is what it's all about. the folk here are paid to deliver packets. the control plane (routing) is one of the tools we use to achieve that end. Re: From: George William Herbert <gherbert@retro.com>
Looking at the routing tables you see failures. If a prefix goes away completely and utterly, and is truly unreachable, then anyone trying to see it is going to see an outage.
not if a covering or more specific tells us how to get packets to the destination. but perhaps that's what you mean by a prefix being unreachable and i am being too picky. randy --- [0] - bibtex @inproceedings{ wang02observation, Author = "Lan Wang and Xiaoliang Zhao and Dan Pei and Randy Bush and Daniel Massey and Allison Mankin and S. Felix Wu and Lixia Zhang", Title = "Observation and Analysis of BGP Behavior Under Stress", BookTitle = "Proc. of ACM SIGCOMM Internet Measurement Workshop 2002, Marseille, France", Month= "Nov", Year = "2002", url = "citeseer.ist.psu.edu/article/wang02observation.html" }