Abstract
VPN networks running over MPLS have found widespread acceptance as both an efficient and cost effective means to provide connectivity for large organizations and companies. However, providing QoS is still a major challenge that needs to be addressed. Using realistic input traffic, a simulation model is built for a large network where various queueing policies are implemented and evaluated for the provision of certain QoS requirements. After a thorough analysis the merits and shortcomings of each policy are determined, and recommendations are given along with future research directions.