Abstract DiffServ QoS mechanism gives packets various forwarding treatments according to different traffic classes to achieve the QoS goals. This research uses NS-2 simulator to study the resource infringement behavior between higher class services (e.g. VoIP) and lower services under DiffServ domain. Experiments show that resource infringement behavior is highly dependent on the ratio of highe...

In this paper, we focus on efficiently achieving Proportional Delay Differentiation (PDD), an instance of the Proportional Differentiation Model first proposed under the DiffServ framework [IEEE Network (1999)]. PDD can be achieved using a few algorithms, one of the most well-known being Waiting Time Priority(WTP). Using WTP [Proc. ACM SIGCOMM (1999)] as a reference, we show that our proposed S...

This paper provides an overview of an implementation of Differentiated Services interior and boundary nodes as described in the SIMA model. The operation of the network nodes was verified with a series of measurements in a simple networking environment. These measurements also give some idea about the level of Quality of Service this kind of mechanism is able to provide.

This document was originally submitted as an internet draft in November of 1997. As one of the documents predating the formation of the IETF’s Differentiated Services Working Group, many of the ideas presented here, in concert with Dave Clark’s subsequent presentation to the December 1997 meeting of the IETF Integrated Services Working Group, were key to the work which led to RFCs 2474 and 2475...

This document contains a tutorial on the recent work in the area of offering services in the Internet. We cover the principles and some of the details of Integrated Services and Differentiated Services. We also explain the relationship to RSVP of each of these architectures. Finally, we draw some conclusions about the relationship of these architectures to SURFnet.