Evaluating Admission Control Modules for Bandwidth Brokers in DiffServ Networks Using ns-2

 In this paper we use the well known network simulator ns-2 in order to study the performance characteristics of various alternatives for the admission control module of a Bandwidth Broker. In particular, we present the modifications that have to be made at the ns-2 architecture in order to simulate these architectures, the metrics such as acceptance rate, fairness towards requests and computation overhead and how they are affected when comparing a simple admission control module and more sophisticated ones. Furthermore, we examine the benefits that can arise under various circumstances through usage of enhancements such as the ability to handle the resubmission of previously rejected requests.