大多数RWA(路由波长分配)问题研究都是基于阻塞率、负载均衡、信号损伤和物理攻击的, 很少涉及到业务与链路工作状态的依赖关系, 然而链路的失效必然造成全网业务安全性能的下降。文章从业务风险的角度描述链路失效对全网业务的影响, 提出了一种基于网络风险的RWA算法——R-RWA。在路由分配阶段, 该算法把具有较小网络风险的路由方案分配给光路请求, 以降低链路失效对全网业务的影响。仿真结果表明, 与经典SP(最短路径)算法相比, 该算法可以有效地降低网络的安全风险, 提高网络的抗风险能力。

Most of the Routing and Wavelength Assignment (RWA) problems are related to blocking rate, load balancing, signal damage and physical attacks, and rarely involved with the dependency of services on the link working state. However, link failures will surely cause the deterioration of the traffic security performances of the entire network. From the perspective of traffic risks, this article describes the impacts of link failures on the entire network services and proposes a network risk-based RWA algorithm, i.e. R-RWA. In the phase of routing assignment, this algorithm allocates the routing scheme with minor network risks to lightpath requests so as to reduce the impacts of the link failures on the entire network services. The simulation results show that compared with the classical Dijkstra + FF, this algorithm can effectively reduce the network security risks and improve the network anti-risk ability.