虚拟专用局域网服务质量研究与改进

摘要

通过适当的控制策略来维持两条传输路由的平衡,同时能提供一种数据类型的优先机制,保障关键数据的传输；主要的思路是使用反馈控制机制,在VPLS网络出口端节点(Ingress Node)监测数据流实际的传输率,当数据流的传输率没有达到预期目标时,就启动差异性服务程序码(Differentiated Services Code Point,DSCP)及流量工程(Traffic Engineering,TE)技术,让拥有不同服务等级的用户在数据流传输时拥有不同的优先级；实验结果表明,使用本机制能够为高级别的用户提供更好的流量服务,同时也降低了边缘路由器(Provider Edge router,PE)的负荷.%Through appropriate control strategies to maintain the balance of two transmission routes, while providing a data type of priority mechanism to protect critical data transmission. The main idea is to use feedback control mechanism, in the VPLS network Ingress Node to monitor the actual transmission rate of data flow, when the data stream transfer rate does not achieve the desired goals, apply Differentiated Services Code Point and Traffic Engineering technologies for users with different service levels in the data stream have different priorities. The result shows that, it can provide better traffic services for high-level user , but also reduces the load on Provider Edge router.