Differentiated Services (DiffServ) are a new approach to support QoS in the Internet which promises better scalability than the Integrated Services Architecture based on the Resource Reservation Setup Protocol (RSVP). The SQUINT project aimed to investigate the potential of the DiffServ concept. First, several services proposed by the DiffServ working group have been analyzed and evaluated. Several prototype implementations and products supporting DiffServ that appeared recently have been studied. An important issue is the behavior of DiffServ in overload conditions. Extensive simulations have been performed in order to evaluate how DiffServ networks behave if the load of certain links exceed the capacity of the assured bandwidth. It has been shown that DiffServ can provide some basic QoS support. However, network engineering becomes very important for DiffServ in order to avoid overload situations. The second part of the project studied the integration of the DiffServ architecture with other QoS-enabling technologies used in the Internet such as Asynchronous Transfer Mode (ATM), Multi-Protocol Label Switching (MPLS), Integrated Services based on RSVP, and Virtual Private Networks. Several synergies but also some problems have been identified if DiffServ is combined with one or more of these technologies.
| Title: | Scalable Quality-of-Service for the Internet (SQUINT) |
| Research Staff: | Florian Baumgartner, Manuel Günter, Mevlyde Kasumi, Ibrahim Khalil |
| Funding: | Deutsche Telekom AG |