Data transmitting in MPLS (multi protocol label switching) network and QoS (quality of service) effects

As the amount of traffic on the Internet increases, the network performance decreases; causing network corruption, delay, jitter, and packet loss. Applications such as Web access, e-mail, and file transfer can tolerate network delays while delay-sensitive applications such as voice, video, and other real-time applications cannot.In a best-effort data transmitting network, increasing bandwidth can be the first step to help with these real-time and delay-sensitive applications but it is not enough. To provide efficient service in the network, some talents must be built into the network. Quality of Service (QoS) protocols is designed to provide the control to a best-effort service and improvement. That?s why Quality of Service (QoS) is a very important parameter for data transmitting.In this thesis, MPLS technology, data flow through the MPSL network, its services, QoS concepts, levels of QoS and QoS effects on the MPLS network are investigated. A network topology with two videophones, two Layer-2 switches and two MPLS service routers is used to generate traffic. At some levels of QoS on the MPLS network, traffic, which is created by videophones calling each other, is analyzed according to the MPLS service router?s monitoring results. For applying different levels of QoS, different configurations are verified on the MPLS service router. The effects of QoS are investigated by comparing the differences between the monitoring results at levels of QoS, which are used in the study.