OPNETTM Modeling of an IP Router with Scheduling Algorithms to Implement Differentiated Services

Enterprises are increasingly depending on their networks to carry mission-critical applications. To ensure the performance of such applications, quality of service (QoS) control is required and routers with QoS functions should be implemented in networks. This paper describes the OPNETTM modeling of an IP router with two scheduling algorithms: custom queuing (CQ) and priority queuing (PQ). A processor module for executing the scheduling algorithms is added between the IP queue module and the point-to-point transmitter module in the IP router. I did two simulations using the developed CQ and PQ routers: one for the network model where the two offices are connected by a WAN link, and one for the network model which to the voice over IP client is connected.