Impact of Code Red and Nimda (posted 2001-12-25)
The Renesys Corporation has published a preliminary report indicating that the Code Red II and Nimda worms caused a somewhat alarming instability in global routing. Remarkably, this instability lasted much longer than those caused by (even quite large) outages. When important links go down, BGP converges within minutes and remains stable after that. The worms on the other hand made the interdomain routing system less stable for many hours.