Integrated Services and Differentiated Services: a Functional Comparison
نویسندگان
چکیده
The increasing demand of Quality of Service (QoS) has lead in the last years to the definition of architectures that modify the best-effort Internet, though in a backward compatible way. The Integrated Services (IS) architecture, tightly coupled with the RSVP protocol, is first one that has been developed by IETF. Soon after its deployment some experimentation of IS networks raised a serious problem, due to the high overhead introduced in network elements. Someone has then started working on an new solution alternative to IS: the Differentiated Services (DS) architecture. In each DS domain a set of services the network can offer to customers is specified. Then, this offer is properly mapped with the neighbour’s offer, and the application’s needs. The result is a lighter architecture that is more scalable but satisfying the QoS demands in a coarser way. Therefore, we can say that the IS is application-oriented and the DS network-oriented. In this paper we will compare different solutions to the same basic problems in both the architectures.
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