中文摘要：

在研究自动交换光网络（ASON）中发生节点故障时的保护方法的基础上，提出了一种针对节点故障使用P圈实现业务保护的方案，同时提出了一种在确保发生单链路故障时实现100％业务恢复率的基础上进行节点故障保护的启发式算法，并通过OPNET软件搭建的ASON仿真平台，在泛欧COST239网络拓扑和北美NSFnet网络拓扑上，采用静态业务模型对该算法进行了仿真评估。仿真结果证明，该算法在拥有故障业务快速恢复能力的同时，相比已有算法具有更低的资源冗余度。

英文摘要：

On the basis of research on node failure recovery in automatic switched optical networks （ASON）, a strategy for node-traglc protection under node failure by use of p-cycles was proposed, and a heuristic algorithm for node failure recovery was given. It will implement link failure recover scheme at first. The proposed algorithm was evaluated under the static traffic model based on an OPNET simulation platform with the topologies of COST239 and NSFnet. The extensive simulation results showed that the proposed algorithm had the advantages of shorter recovery time and lower capacity redundancy.