摘要： 给出DSMCast区分服务组播的一个改进方案，该方案只封装组播树上核心节点的复制、转发等信息，边界节点可维护各自的本地组播状态信息，保持了原有DSMCast方案中简化核心节点的优点，减少每个组播分组扩展头部的封装信息量，提高组播分组的有效利用率。仿真实验表明，改进的方案优于DSMCast方案。

关键词: 区分服务, 组播, DSMCast方案

Abstract: An improved approach of DSMCast is presented. In the approach, only the replicating and forwarding status information for the core nodes are encapsulated into the packets’ extended header, and the edge nodes should maintain local multicast informations. Core routers are simplified as it is in DSMCast, and the size of the extended header of multicast packets will descend dramatically. As a result, the utility ratio of each packet will be higher than DSMCast approach. According to the simulating result, the approach behaves better than DSMCast.

Key words: DiffServ, multicast, DSMCast scheme

中图分类号: 

• TP393.07