IP: recoverability of routers

[Dave Farber <farber () cis upenn edu>]

Date: Wed, 28 Oct 1998 12:50:40 -0500 
From: hamors () aloft micro lucent com (Sean_Sosik-Hamor) 
Subject: AT&T Loses over 400 T3s 
We're not sure when the fault (probably a fiber cut, but that's unconfirmed) 
actually happened, but Lucent Microelectronics in Allentown, PA lost all 
network connectivity at approximately noon today. AT&T lost approximately 
400 T3s, which caused every single Lucent router nationwide to try to 
relearn their routes and effectively pegged all routers at 100%. 
Because of this, a second outage occurred due to the fact that the routers 
were too busy relearning their routes to actually pass traffic. This was a 
nationwide outage for both Lucent and AT&T. As of 01.45pm, Lucent locations 
in Allentown, PA have isolated all traffic from the backbone, so at least 
we're back up and running. 
Sean