WDM光网络中基于链路的动态组播共享保护算法

针对WDM光网络中单链路失效的情况,提出了一种基于链路的保护动态组播业务的优化共享保护算法(Link-based optimized shared-protection algorithm for multicast sessions,LB-OSPM).该算法在对工作树任意光纤链路失效情况寻找保护路径时,允许组播内不同保护路径共享预留波长资源,同时通过引入预留波长使用情况矩阵和波长预留矩阵记录预留波长资源的使用情况,实现了不发生冲突的不同组播的保护链路间共享预留波长资源.研究采用欧洲光网络(European Optical Network,EON)的拓扑对不同波长资源配置和网络负载情况下LB-OSPM算法的网络连接阻塞率做了仿真.结果表明,通过引入共享机制,LB-OSPM算法在对单链路失效保证100％恢复率的同时可以获得更低的连接阻塞率,提高了波长资源利用效率.

Link-Based Shared Protection Algorithm for Dynamic Multicast Sessions in WDM Networks

This paper proposes a link-based optimized shared-protection algorithm for multicast(LB-OSPM) sessions against single link failure in WDM networks.LB-OSPM allows different protection paths of a working tree to share reserved wavelengths.By introducing wavelength usage matrix and wavelength reservation matrix to record the detailed usage of past reserved wavelengths,LB-OSPM also enables the sharing of reserved wavelengths between protection links belonging to different multicast sessions if these links are not going to act simultaneously.Study uses the topology of European Optical Network(EON) to calculate the network blocking probability of LB-OSPM under various conditions of wavelength resources and network loads.The results demonstrate that LB-OSPM lowers network blocking probability by means of a sharing mechanism.Meanwhile,it assures a 100% restorability rate in the case of single link failure.