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为了提高网络的生存性,该文提出了一种新型的适合于大规模自动交换光网络的快速分级子网恢复机制。该机制充分利用自动交换光网络分层路由的灵活性,采用分级的子网恢复信令过程和最短路恢复路径选择算法。在提高网络资源利用率的同时,极大地降低了网络的恢复时间。对这种新机制的信令过程进行了详细地描述和分析,并通过仿真计算与其他几种传统恢复机制的性能进行了比较,结果表明:对于跨多个域的连接,分级子网恢复机制具有更低的平均恢复时间;同时发现,缩小子网规模,可以进一步减少恢复时间。
In order to improve the survivability of the network, this paper presents a novel fast hierarchical subnet recovery mechanism suitable for large-scale automatic switched optical networks. This mechanism makes full use of the flexibility of the Hierarchical Routing of Auto-Switched Optical Network, adopts hierarchical sub-network restoration signaling process and shortest path recovery path selection algorithm. In improving the utilization of network resources at the same time, greatly reducing the network recovery time. The signaling mechanism of this new mechanism is described and analyzed in detail, and compared with several other traditional recovery mechanisms by simulation. The results show that for the connection across multiple domains, the hierarchical subnet recovery mechanism With a lower average recovery time; also found that reducing the size of the subnet, you can further reduce the recovery time.