ABSTRACT
Differentiated Services Network Model (DiffServ) is proposed by the IETF in order to solve the scalability problem of the Integrated Services Network Model (IntServ). The goal of DiffServ is make the network more efficient and simpler to meet the actual demand of the network scalability. It is achieved mainly by simplifying service mechanism and target in the internal of the network. The internal nodes are only responsible for queue scheduling and forwarding, saving flow state information, and achieving flow control mechanism are only done at the edge of network, regardless of the state of internal nodes and networks, thus simplifying the job at interior nodes of the network, i.e., core routers, and forming the network that have complex edge and simple core. Using an aggregation transmission control method, the service target is aggregation flow rather than single flow. The preservation and processing of single flow information at the edge of network, the number of internal services target relative reduction, greatly enhancing the network scalability.
