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研究了波带交换中的静态业务疏导算法。波带交换可以有效地减少波长交换的端口数量,但是当波带粒度值取固定值时,波带的粒度难以取得合适值。波带的粒度大,有助于减少交换端口的数量,但是波带利用率低;波带粒度小,有助于提高波带利用率,但是交换端口的数量多。为此,提出了多粒度的波带取值方法。根据静态业务疏导与组播路由的相似性,提出了利用构造组播树解决静态疏导问题的方法。另外,为了减少波带与波长交换平面互联的端口数量,采用了同目的地的波带疏导策略,并针对这一疏导策略提出了一种新的波带疏导辅助图。仿真结果表明,相对于固定粒度的波带取值,可以有效地减少交换端口的数量,并提高波带利用率。
We study the static grooming algorithm in band switching. Wave band switching can effectively reduce the number of ports for wavelength switching, but when the band granularity takes a fixed value, the band granularity is difficult to obtain a suitable value. Wave band granularity helps to reduce the number of switching ports, but the band utilization is low; band granularity is small, help to improve the utilization of the band, but the number of switching ports. To this end, proposed a multi-granularity of the value of the band. According to the similarities between static grooming and multicast routing, a method of constructing static multicast grooming is proposed. In addition, in order to reduce the number of ports interconnecting the wavelength band with the wavelength switching plane, a band grooming strategy of the same destination is adopted, and a new grooming drawing of the band grooming is proposed according to the grooming strategy. The simulation results show that, compared with the fixed granularity, the number of switching ports can be effectively reduced and the bandwidth utilization can be improved.