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为了提高网络的生存性,提出一种适用于大规模多域光网络的跨域段保护机制。该机制改进现有“按域分段,域内保护”的段保护方案,将保护通道跨接在受保护域的前后邻域的边界节点上,使得工作通道中相邻的段之间互相重叠,从而实现对域边界节点和域间链路的完全保护,克服了现有方案中要求网络相邻域之间共享边界节点的限制。分析这种新机制的信令过程以及相关性能参数,通过仿真计算与一般的通道保护机制进行了比较。结果表明,跨域段保护机制具有更快的保护倒换速度和较好的资源利用率。
In order to improve the survivability of the network, a cross-domain protection mechanism suitable for large-scale multi-domain optical networks is proposed. This mechanism improves the existing segment protection scheme based on domain segmentation and intra-domain protection. By bridging the protection tunnels on the border nodes of the front and back neighborhoods of the protected domains, the adjacent segments in the working tunnel overlap with each other, So as to completely protect the border nodes and the inter-domain links of the domain and overcome the limitation of the existing scenario that the border nodes are required to be shared between adjacent domains of the network. The signaling mechanism and related performance parameters of this new mechanism are analyzed and compared with the general channel protection mechanism through simulation. The results show that cross-domain protection mechanism has faster protection switching speed and better resource utilization.