面向大规模网络的聚集TCP流量模拟方法研究

为平衡大规模网络骨干网上TCP流量模拟的准确性和复杂度,提出模拟接入网出口处的TCP聚集流量,而不从单台主机或会话的层面进行流量模拟。从网络流量的自相似性出发,提出基于应用层和网络传输层自相似的TCP聚集流量模型:在应用层通过聚集多个服从Pareto分布的ON/OFF源模拟生成自相似流量,在网络传输层根据TCP机制实现对应用层流量的聚集传输控制。模拟结果显示,在流量负载比例、流量自相似性以及骨干节点丢包率等方面,模拟结果与采集自某互联网交换中心的实际数据吻合良好,表明了该模型的有效性。

Simulating method for TCP aggregated traffic of large scale network

To obtain a trade-off between veracity and complexity when simulating TCP traffic of large-scale network,the TCP aggregated traffic of access network in the gateway was proposed as simulated object,instead of the traffic generated at the individual host or session level.Based on the self-similarity of application-level and network-level,the TCP aggregated traffic model was proposed due to the self-similarity of network traffic.The self-similar traffic at application level was generated by aggregating many ON/OFF sources following Pareto distribution.The aggregated transmission control was put on the traffic at network transmission level based on the mechanism of TCP protocol.Compared with the real data collected from a Network Exchange Center,the simulating result shows the validity of the model from the criteria of traffic load proportion,traffic self-similarity,and the packet loss ratio.