In this paper, we present the framework to provision end-to-end QoS in heterogeneous multi-domain networks that was implemented in EuQoS system and tested in Pan-European research network.
The EuQoS system is a complete QoS system, scalable to large dimensions and addressing QoS at all relevant layers, which has been developed within the framework of the IST-EuQoS project. Its design has been aided by a considerable amount of modeling and simulation work, aimed at testing the various QoS mechanisms devised and their interaction. This paper describes the modeling and simulation work done in the framework of the project. We describe the three simulation models which have been developed, based on the different timescales at which the QoS mechanisms have effect. Furthermore, as a sample case of performance evaluation, involving different simulators, we describe the performance evaluation of the EuQoS signaling subsystem
This paper deals with the problem of assuring strict QoS guarantees for the end to end connections that originate from Ethernet access network. It shows that despite high link capacities in some cases Ethernet network might be the reason of QoS deterioration. The primary reason is the lack of appropriate QoS differentiation and traffic isolation mechanisms. The shared buffers and priority schedulers available in most of Ethernet switches appear to be not sufficient to guarantee strict QoS. For these cases new solution is proposed which relies on additional traffic control mechanisms available in other network elements. Only additional mechanism supporting typical functionality of Ethernet switch can provide strict QoS guarantees what was verified in simulations studies.
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