Nonblocking Operation of Asymmetrical Clos Networks

In this paper, we study the nonblocking operation of asymmetrical three-stage Clos networks. We consider a control algorithm for operating the. asymmetrical Clos networks in the nonblocking mode. We derive sufficient conditions under which these networks are nonblocking for this control algorithm. Further, we provide results on the number of faults tolerated by the algorithm in the nonblocking mode of operation. We next design a different control algorithm for nonblocking operation of asymmetrical Clos networks. Using simulation results, the new control algorithm is shown to perform better than the previous one in terms of network utilization, blocking probability and fault-tolerance.