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为了使支持服务质量(QoS)路由的路由器获得网络中实时变化的QoS状态,提出一种部署在QoS路由器上的分布式实时测量方案,直接在现有链路上测量有向链路可用带宽、时钟差、分组传输延迟和分组丢失率等参数。测量手段为主动测量和被动测量相结合,采样方法为分层随机采样,数据处理为指数移动平均和中值,测量得到的结果通过QoS路由协议传播给其它QoS路由器。该方案已经在服务质量路由器原型系统上实现。分析和实验结果表明:该方案无需第三方设备就可满足所需的精度,测量结果既反映最新的网络状态又具有相对的稳定性。测量分组在每条链路上仅占用2kb/s的带宽,且和网络规模无关。
In order to make the router supporting Quality of Service (QoS) routing obtain real-time varying QoS status in the network, a distributed real-time measurement solution deployed in QoS router is proposed to directly measure the available bandwidth of the directed link on the existing link, Poor clock, packet transmission delay and packet loss rate and other parameters. The measurement method is a combination of active measurement and passive measurement. The sampling method is stratified random sampling, data processing is exponential moving average and median, and the measured results are transmitted to other QoS routers through the QoS routing protocol. The solution has been implemented on a quality of service router prototype system. The analysis and experimental results show that this solution can meet the required accuracy without the need of third-party equipment. The measurement results reflect the latest network status and relative stability. Measurement packets occupy only 2kb / s of bandwidth on each link, and are not network scale.