Abstract
In this paper we present a class of multipath multistage interconnection networks (MINs) called Augmented Shuffle-Exchange Networks. These MINs can be designed to have the degree of switch fault tolerance desired. They feature links among switches belonging to the same stage, and the number of links between adjacent stages is the same as in unique path MINs. The paths available from a source to a destination have varying lengths. Rerouting in the presence of faults or blocking can be accomplished in these MINs dynamically, without resorting to backtracking. In addition to tolerating faults in individual switches, the proposed networks make it possible to tolerate faults in groups of switches, thus facilitating on-line repair. Reliability and performance studies show that the proposed MINs achieve a significant improvement over unique path MINs and compare favorably with other multiple path MINs.
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