Simulation-Based Performance Comparison of Queueing Disciplines for Differentiated Services Using OPNET

Queueing disciplines have been a subject of intensive discussion and research in the network field for scheduling packets from different traffic flows for processing at a network node (switch or router). Several queue scheduling disciplines have been designed to improve the quality of service for networked multimedia applications. In this paper, we evaluate the performance of four queueing disciplines (FIFO, PQ, WFQ and DWRR) that are widely deployed for differentiated services using a hypothetical network topology. We carry out simulation using OPNET and compare their relative performance based on queueing delay, packet drop rate, end-to-end delay and delay jitter with drop-tail and RED policies.