网状WDM网中多播业务的共享保护设计

研究网状波分复用(WDM)光网络中动态多播业务的保护方案,提出一种共享保护和重配置(SPR)算法.该算法根据网络状态动态调整链路代价,为每个多播业务请求建立最小代价工作树,并为光树上互不重叠的工作段提供链路分离的保护段.当网络中发生链路失效时,进行业务段保护切换和局部资源重配置.仿真表明,该算法可以合理共享波长资源、平衡网络负载,有效保护WDM网中任意单链路失效,并在多链路失效情况下大大提高业务恢复能力.

Shared Protection Design for Multicast Traffic in Meshed WDM Networks

The protection design for dynamic multicast traffic in wavelength division multiplexing(WDM) networks is studied.We propose a shared protection algorithm called SPR,which computes a minimum cost light-tree for each multicast connection request,and find a link-disjoint backup segment for each working segment on the light-tree.If a fiber link fails,SPR can reprovision new capacity for the vulnerable segments.The simulations show that SPR can efficiently use the wavelength resources and protect multicast traffic against any single-link failure,and it also can greatly improve the traffic restorability when multiple-link failure occurs.