Scheduler performance evaluation and the effect of aggregation on QoS in a DiffServ enabled network

Various network traffic models exist that describe network traffic behaviour, but no model describes differential traffic treatment to such an extent to be able to relate the impact different rates has on the various traffic classes. With computer network simulation, we evaluate four different standardized PHBs, namely EF, AF1, AF2 and BE. The PQ, SFQ, SCFQ, WFQ, WF²Q+ and LLQ scheduling mechanisms are analysed to find their performance in relation to EF traffic as well as the effects of different traffic aggregation schemes on them. The QoS factors we focus on are: one-way delay, queue lengths and inter-packet delay variation. Network topologies are large and are defined by various parameters, thus our simulations are performed using acceptable bounded properties