Alternate routing for quality of service support in a differentiated services network

Congestion in a network is very critical especially during Emergency situations. Various AQM schemes have been suggested which drop packets in an effort to prevent the queues from filling up completely. Differentiated Services implementation is used to provide preferential treatment to different types of traffic having different characteristics. Packets are dropped depending on their drop precedence. The following work focuses on alternately routing these dropped packets over other links in the network, which are idle or underutilized to improve overall throughput.; The current work proposes a way to choose an alternate path from a set of possible alternate paths. Analytical proof is given to prove the avoidance of loops when packets are sent over the selected alternate path. The idea behind this work is to protect high priority traffic and then give considerable service to low priority traffic. The work studies the effect of this scheme on delay and throughput in a Diffserv domain.; The simulations were done using Network Simulator (NS2) tool. Results showed advantages of using alternate routing for UDP traffic.