Abstract
(Englisch)
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DIANA project focussed on developing, integrating, validating and demonstrating resource reservation and traffic control functionality to achieve end-to-end QoS in IP networks and in heterogeneous A TM and IP networks. DIANA solution allows applications to communicate their demands to the network and enable network devices to signal those demands across IP domains, as well as IP and ATM domains. The DIANA solution was succesfully presented at TELECOM99, in the booth of the European Community. In the presented solution, at the boundary between the A TM and IP domains, DIANA protocols translated between RSVP and ATM signalling, thereby supporting the different QoS specifications of IP and ATM. The developments in DIANA allow the investigation of different approaches for the convergence of RSVP/IP and A TM, as well as providing an insight into the feasibility and efficiency of this topology and the optimum sizes of the two domains.
The main results of EPFL in DIANA are: (1) A complete kernel design supporting mechanisms for traffic control, filtering and signaling (e.g. Differentiated Services) at routers. This has been implemented under the Linux Operating System. and it is currently part of new Linux releases.
(2) The 'Scalable Resource Reservation Protocol', designed to support reservations for very large numbers of concurrent unicast flows on the Internet.
(3) An input-output characterisation for the class of time varying shapers, which alows to model the dynamic QoS negotiation problem with IntServ traffic in IP networks.
(4) The renegotiable variable bit rate (RVBR) service, which is based on the renegotiation of the traffic specification, and allows to reach a dynamic and efficient usage of the resources. We defined how it applies to resource reservation.
(5) An architecture design for dynamic QoS negotiation for Internet traffic with RSVP, evaluated by accomplishing a prototype implementation, whose performance was measured with temporized file transfer using real MPEG2 video traces. The results indicate that renegotiation is an efficient mechanism for accommodating traffic fluctuations over the burst time-scale and that the RVBR service can be easily implemented in real applications, using available technology.
During its participation in DIANA, EPFL was invited to collaborate to the European Activities of the Ni-chains G3 on Internet and A TM coexistence (NIG-G3). The outcorning NIG-G3 Guideline aims at helping business strategists and end users to evaluate the competing IP/ATM architectures and technologies, helping to clarify, from an unbiased point of view, the state-of-the art.
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