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Multi-layer networks are computer networks where the configuration of the network can be changed dynamically at multiple layers. However, in practice, technologies at different layers may be incompatible to each other, which necessitates a careful choice of a multi-layer network model. Not much work has been done on path selection in multi-layer networks.(More)
—Data sets in e-science are increasing exponentially in size. To transfer these huge data sets we need to make efficient use of all available network capacity. This means using multiple paths when available. In this paper a prototype of such a multipath network is presented. Several emerging network technologies are integrated to achieve the goal of(More)
Conventions such as iGrid 2005 and SuperComputing show that there is an increasing demand for more service options on networks. For such networks, large teams of experts are needed to configure and manage them. In order to make the full potential of hybrid networks available to the ordinary user, the complexity must be reduced. This paper presents the idea(More)
In recent years, dynamic multi-layer networks have emerged. Unlike the regular networks, these multi-layer networks allow users and other networks to interface on different technology layers. While path finding on a single layer is currently well understood , path finding on multi-layer networks is far from trivial. Even the constraints (i.e. possible(More)
There is a trend in the research networking community to provide e-Science applications with dedicated connections instead of shared links. Lightpaths are the way to guarantee the appropriate level of service in terms of bandwidth and latency. NDL – Network Description Language – is a data model offering users and providers of lightpaths with a common(More)
The goal of the OptIPuter project is to tightly couple research applications with dynamically allocated paths. Since OptIPuter is a multidisciplinary project, the paths through the network often span multiple network domains, and the applications are challenged to find valid network connections through these domains. The challenge arises if the different(More)
The TCP transport protocol is currently inefficient for high speed data transfers over long distance networks with high bandwidth delay products. The challenge is to develop a protocol which is fast over networks with high band-width delay products, fair to other high volume data streams, and friendly to TCP-based flows. We describe here a UDP based(More)
Many Grid applications require high bandwidth end-to-end connections between Grid resources in different domains. Fiber optic networks, owned by different providers, have to cooperate in a coordinated manner in order to provide an end-to-end connection. Currently, multi-domain optical network solutions require paper-based long-term contracts between(More)
Optical or lambda exchanges have emerged to interconnect networks, providing dynamic switching capabilities on OSI layer 1 and layer 2. So far, the only inter-domain dynamics have occurred on layer 3, the IP layer. This new functionality in the data plane has consequences on the control plane. We explain this by comparing optical exchanges with current(More)