TY - JOUR T1 - QoS and SLA aspects across multiple management domains: The SEQUIN approach JF - Future Generation Computer Systems (FGCS) Journal, Special Issue from the TERENA 2002 Networking Conference, Elsevier Science, Volume 19, Issue 2 Y1 - 2003 A1 - Christos Bouras A1 - Afroditi Sevasti A1 - M Campanella A1 - M Przybylski AB - The aim of this work is to define and implement an end-to-end approach to quality of service (QoS), operating across multiple management domains and exploiting a combination of link layer technologies. The architecture for the Premium IP service is presented, which aims at offering the equivalent of an end-to-end virtual leased line service at the IP layer across multiple domains. Also, the results of the initial testing performed for the validation of the service and the provisioning model for Premium IP are described. The work presented has been carried out in the framework of SEQUIN, a European Commission-funded research project. ER - TY - CONF T1 - SLA definition for the provision of an EF-based service T2 - 16th International Workshop on Communications Quality & Reliability (CQR 2002), Okinawa, Japan Y1 - 2002 A1 - Christos Bouras A1 - Afroditi Sevasti A1 - M Campanella AB - The evolution of mechanisms for providing Quality-of-Service (QoS) over the contemporary network infrastructures has introduced the need for regulation and management of the emerging QoS services with the use of Service Level Agreements (SLAs). SLAs for QoS-enabled networks move one step forward in the direction of traditional ones, in the sense that they do not only have to specify availability, security, quantity of allocated resources and a number of other quantitative values but also have to specify the values of appropriate quality parameters. This paper deals with the particular cases of introduction of QoS mechanisms to large transport networks according to the DiffServ architecture. In these cases, the extensive level of aggregation of flows and the connectionless nature of QoS services’ provisioning makes the definition of QoS parameters and the engineering of QoS metrics in the traditional SLA specification a demanding task. Due to the fact that strictly bounded deterministic guarantees are not realistic, usually only upper bounds for the relevant parameters can be defined and the corresponding SLAs have to be defined accordingly. JF - 16th International Workshop on Communications Quality & Reliability (CQR 2002), Okinawa, Japan ER -