Date Added: May 2011
End-to-End packet delay is one of the canonical metrics in Internet Protocol (IP) networks and is important both from the network operator and application performance points of view. The motivation for the present work is a detailed knowledge and understanding of such "Through-router" delays. A thorough examination of delay leads inevitably to deeper quest-ions about congestion and router queuing dynamics in general. Although there have been many studies examining delay statistics and congestion measured at the edges of the network, very few have been able to report with any degree of authority on what actually occurs at switching elements.