01446nas a2200169   4500008004100000245009800041210006900139260002200208520079800230100002101028700002201049700001901071700002001090700001301110700001601123856013701139       2005                        eng d00aTechniques for DiffServ - based QoS in Hierarchically Federated MAN Networks - the GRNET Case0 aTechniques for DiffServ based QoS in Hierarchically Federated MA  c18 - 21 September3 aDiffServ is the basis of contemporary QoS-enabled networks. Setting up DiffServ QoS requires extensive engineering effort in dimensioning and provisioning, especially for adjacent networks under different administrations linked in a “federated” hierarchy. In this paper we present a case study for QoS techniques employed in the GRNET MAN networks of Athens and Crete. After introducing the supported QoS mechanisms and service types, we discuss our dimensioning methodology and present two algorithms for worst-case dimensioning. We explain the provisioning mechanisms of GRNET and we present in brief our new automated provisioning ANS tool. Finally, we deal with the extension of our mechanisms and tools in hierarchically federated networks and give some future directions of our work.1 aBouras, Christos1 aPrimpas, Dimitris1 aLiakopoulos, A1 aVarvitsiotis, A1 aSiris, V1 aFotiadis, G  uhttps://telematics.upatras.gr/telematics/publications/techniques-diffserv-based-qos-hierarchically-federated-man-networks-grnet-case