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Clos-network switches were proposed as a scalable architecture for the implementation of large-capacity circuit switches. In packet switching, the three-stage Clos-network architecture uses small switches as modules to assemble a switch with large number of ports or aggregated ports with high data rates. Current schemes for configuration of Input-Queued three-stage Clos-network (IQC) switches involve port matching and path routing assignment, in that order. The implementation of a scheduler capable of matching thousands of ports in large-size switches is complex because of the large port count. To decrease the scheduler complexity for such switches (e.g., 1024 ports or more), the authors propose a configuration scheme for IQC switches that hierarchizes the matching process.
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