基于分布式资源管理的DiffServ组播策略

摘要

针对区分服务(DiffServ)和组播直接结合所产生的可扩展性问题、被忽视的预留子树问题和异构组播组问题,提出了一种基于分布式资源管理的区分服务组播策略(DMSBD).新方案采用由边界节点对DiffServ域内资源进行分布式管理的方式,申请加入组播组的新成员必须通过接纳控制审核才能享有合法的优先级,同时采用接收方驱动的思想建立一套服务质量请求信令机制,并通过使用重标记的方法使组播数据流的转发节点明确知晓新成员的服务质量请求.仿真结果表明该方案能够有效地解决或缓解区分服务和组播结合时所产生的几种问题.%Focusing on the problems of scalability , neglected reservation sub-tree (NRS) and heterogeneous multicast group , which are caused by the direct combination of differentiated service (DiffServ) with multicasting, this article proposed a DiffServ multicasting strategy based on distributed resource management ( DMSBD). It adopts the distributed resource management manner which needs edge nodes to manage the resource in the DiffServ domain, and new members which request to join the multicast group must be checked through by the admission control, and then can take legal priority. At the same time, it adopts the receiver-driven idea to establish a QoS request signal mechanism and use the re-mark method so that forwarding nodes know new members QoS requests clearly. The simulation result showed that DMSBD can solve the above problems effectively when DiffServ combines with multicasting.