End-to-end Congestion Control Techniques for Router

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 know-ledge and understanding of such "through-router" delays. A thorough examination of delay leads inevitably to deeper questions 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. In existing system the single-hop packet delay measured and analyzed through operational routers in a backbone IP network. However since the router had only one input and one output link, which were of the same speed, the internal queuing was extremely limited. In this paper work with a data set recording all IP packets traversing a Tier-1 access router. All input and output links were monitored, allowing a complete picture of congestion and in particular router delays to be obtained. This paper provides a comprehensive examination of these issues from the understanding of origins and measurement.