DiffServ Network Simulation and Performance Analysis Based on NS-2

Currently, DiffServ is still evolving, the definition of the model has not yet finalized, and DiffServ implementation of IP QoS Assurance is still at the stage of experiments and research. The biggest problem exists in DiffServ is how to provide users with the services of different properties of the number and hierarchical distinction, at the same time there is multicast to achieve more complex and need to be resolved between the micro-flow fairness in the same class gathered. Therefore, this thesis can not study all issues related to the DiffServ network, but only work on protecting critical data loss. And ensure that the service AF which is a assurance service of the current DiffServ network will achieve end-to-end quality . To this end, the corresponding simulation network structures is present in the article for analysis of these two research directions.