The new emerging QoS architectures are motivated by the desire to improve the

overall performance of an IP network. Differentiated Services (Diffserv) define a model for

implementing scalable differentiation of QoS in the Internet. Multiprotocol Label

Switching (MPLS) is a fast label-based switching technique that offers new QoS

capabilities for large scale IP networks. When an MPLS network supports DiffServ, traffic

flows can receive class-based network treatment that provides bases for QoS guarantees.

The objective of this work is to study the influence of the QoS mechanism via

DiffServ-MPLS on network parameters such as jitter, delay and throughput. The

comprehensive study showed general improvement in the throughput, jitter and delay

particularly of voice and video transmission when using DiffServ-aware MPLS network as

compared to pure IP only or MPLS only.