DTSM:基于动态隧道的可扩展组播路由协议  

DTSM:Dynamic tunneling based scalable multicasting routing protocol

作　　者：蒋锦鹏[1] 包丛笑[1] 李星[1] 

机构地区：[1]清华大学信息网络工程研究中心,北京100084

出　　处：《清华大学学报（自然科学版）》2009年第7期1050-1053,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金资助项目(90412010)

摘　　要：在广泛部署和大规模应用IP层组播时,组播状态将超出路由器的性能极限。为了解决组播路由的状态可扩展性问题,提出了基于动态隧道的可扩展组播路由协议(DTSM)。该协议采用隧道方式消除了非分支节点状态。在状态容量充足时,该协议与传统组播协议效率相同。在状态容量不足时,自适应地调整转发树拓扑,以带宽和延时为代价进一步减少组播状态。仿真结果显示:该协议可以在不显著增加带宽和延时的前提下,使组播最大状态数减少一个数量级,可以有效地缓解组播状态压力。Multicasting states often exceed the router＇s capability due to wide deployment and extensive usage of IP layer multieasting. A dynamic tunneling based scalable multicasting routing protocol （DTSM） was developed to reduce the number of multicasting states connected to the router. The protocol eliminates non-branching node states by tunneling with sufficient state capacity, and achieves comparable efficiency to traditional multieasting. When the state capacity is exhausted, the protocol adjusts by adaptively tunneling the topology to further reduce the multieasting states at the expense of bandwidth and delay. Simulations show that the protocol reduces the maximum multieasting states by an order of magnitude without incurring significant bandwidth or delay overhead, which effectively alleviates multicasting state limitations.

关 键 词：计算机网络 路由协议 组播 可扩展性 隧道 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]