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大规模网络情况下,动态组播路由中不仅拓扑状态信息需要压缩,组播相关状态信息也需要压缩,这就产生组播树状态信息聚集(MTSA)问题。该文对MTSA进行了全面、深入的探讨,主要包括:对时延-带宽约束下的组播树状态信息(MTSI)进行定义;提出“伪树上边界节点(PTBN)”模式的组播树状态信息聚集模式;提出“层宽代表点”方式的多个MTSI的压缩方法。最后该文对PTBN压缩效果进行了分析:PTBN压缩后的域MTSI不会随网络规模扩大而激增,同时压缩后的MTSI对组播路由效率不会产生影响。
In the case of large-scale networks, not only the topological state information needs to be compressed in the dynamic multicast routing, but also the relevant state information of the multicast needs to be compressed, which results in multicast tree state information aggregation (MTSA). In this paper, a comprehensive and in-depth discussion on MTSA is made, which mainly includes: defining multicast tree state information (MTSI) under the time-bandwidth constraint; presenting the group of “PTBN” Broadcast tree state information aggregation mode; put forward “layer width representative point ” method of multiple MTSI compression method. Finally, the paper analyzes the PTBN compression effect: the PTBN compressed domain MTSI does not increase with the network size and the compressed MTSI has no effect on the multicast routing efficiency.