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Switching theory and practice have developed tremendously during the past decade. In order to adequately motivate our work, it is useful to survey this development and consider the influence theory and practice have had on each other. The theory consists, in the main, of designing scheduling algorithms for a variety of switch architectures and developing tools for proving performance guarantees. Particularly, there are two main research threads for crossbar fabrics, which are of practical interest, depending on the fabric speedup: the focus at speedup 1 has been on algorithms which deliver 100% throughput and low average delays, and at speedup 2 it has been on algorithms which provide precise delay guarantees.
At speedup 1, the seminal result of Tassiulas and Ephremides [12] and McKeown et al [10] is that the maximum weight matching (MWM) algorithm delivers 100% throughput. Despite this highly desirable property, the MWM is not commercially implemented because it lacks the follow

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