Résumé: The diferentiated services (Di.Serv) model, proposed as a scalable way of providing quality of service in the Internet, provides packet level service di.erentiation on a per-hop basis. To provide the end-to-end service di.erentiation more e.ciently for the assured services, as well as a source marker, an interdomain marker placed at the boundary edge routers connecting network domains is necessary because an Internet connection usually spans through a path involving one or more network domains. Such an interdomain marker should be operated at the aggregate .ow level due to the scalability problem. The random early demotion and promotion (REDP) marker was proposed as an interdomain marker. It introduces randomness and early decisions on the three-color packet marking process at the aggregate .ow level to remove the phase e.ect that brings about the unfairness in the demotion and promotion among di.erent .ows. The REDP marker achieves good UDP fairness in demoting and promoting packets through random and early marking decisions on packets. However, TCP fairness of the REDP marker is not obvious as for UDP sources. In this paper, we propose a new interdomain marker to resolve the problem of the REDP marker. Instead of unfair packet droppings at the RIO bu.ers in the core routers which cause unfairness of TCP .ows, it fairly drops the green packets of each TCP .ow with a token .lling rate con.guration method before they enter into the core routers. By doing this fair early packet dropping, it increases TCP fairness at a minor expense for the total throughput.

Langue: Anglais