多级多平面光交换结构的网络故障研究

Research on the Network Fault in Multistage Multi-plane Optical Switching Fabric

在可重排多级多平面Clos光交换结构中,故障的存在影响光交换结构的无阻塞特性,带来业务的阻塞。该文通过分析故障的特性,提出一种基于阈值的限流算法。该算法通过考虑故障对内外层调度的综合影响,找出一定会受到故障影响的业务并在最外层进行限流,从而保证各层调度的高效实现和业务阻塞率的下降。仿真结果表明限流算法能有效降低业务阻塞率;且随着故障所在位置的深入或者时隙数的增加,限流算法的性能更优。

Fault in a rearrangeable multistage multi-plane Clos optical switching fabric network will change the non-blocking characteristics of the switching fabric and introduce traffic blockage. Based on analyzing the properties of the faults, a threshold-based limiting algorithm is proposed. Considering the combined fault effects to different layers, the algorithm finds out the traffic loads which can not be supported due to the fault. Those traffic loads are then limited in the outmost layer to achieve efficient scheduling of the following layers and to reduce the blocking probability. Simulation results show that the limiting algorithm can reduce the blocking probability effectively. With the deepening of the fault location and time slot increasing, the algorithm has a better performance.