Semi-rearrangeably nonblocking operation of Clos networks in the multirate environment
IEEE/ACM Transactions on Networking (TON)
Wide-sense nonblocking for multirate 3-stage Clos networks
Theoretical Computer Science
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The 3-stage Clos network is generally considered the most basic multistage interconnecting network(MIN). The nonblocking property of such network has been extensively studied in the past. However there are only a few lower bound results regarding wide-sense nonblocking. We show that in the classical circuit switching environment, for large r to guarantee wide-sense nonblocking, 2n - 1 center switches are necessary where r is the number of input switches and n is the number of inlets of each input switch. For the multirate environment, we show that for large enough r any 3-stage Clos network needs at least 3n-2 center switches to guarantee wide-sense nonblocking. Our proof works for even 2-rate environment.