中文摘要：

在区分服务（Differentiated Services，DiffServ）网络中，为了消除病态流对确定性转发（Assured Forwarding，AF）服务的不良影响，提出了一种基于RIO（RED IN and OUT）的主动队列管理机制RIO—SD。这种机制不需要在核心路由器维护每一个流的状态，而是通过观测虚拟队列的丢包历史记录来鉴别病态流，并通过虚拟队列的前置滤波器加大病态流的丢包率，实现对病态流的控制。仿真结果表明RIO-SD可以有效抑制病态流对带宽的占用，提高其他正常流的性能。

英文摘要：

A RIO-based active queue management mechanism, RIO-SD （RED IN and OUT with Selective Dropping）, was proposed to remove the impact of ill-behaved flows on Assured Forwarding Services in DiffServ networks. Under this scheme, it is not required to maintain per-flow state in core routers, while the ill-behaved flows can be identified based on the drop history of the OUT-profile virtual queue. RIO-SD controls the monitored ill-behaved flows by increasing its drop probability using two pre-filters placed in front of the IN-profile and OUT-profile virtual queues respectively. Simulation results indicate that our approach can improve the performance of other normal flows.