基于软件定义网络的网络故障诊断方法研究

基于软件定义网络环境下故障诊断方法的研究现状，提出了一种在软件定义网络下故障诊断定位的方法。通过发送具有匹配识别标志字段的TCP测试数据分组，利用软件定义网络环境下控制器的可编程和流表可扩展匹配的特性，设计匹配流表和指令，匹配并按特定格式写入具备定位作用的转发信息到测试数据分组。监听分析模块根据返回数据分组中的历史转发信息，提取数据并据此诊断和定位网络故障。在模拟环境下，实验结果证明了该方法的有效性，具备一定的应用价值。

Research on networking troubleshooting method based on software defined network

Based on the reaserch status of networking troubleshooting in software defined network,a new net-working troubleshooting method was proposed.A TCP packet marked in head field was sent and detailed forward information in every hop would be written in its data filed once the test packet was matched.Taking advantages of the programmable feature of the controller and OpenFlow extensible match,special flow table was designed for matching test-used packet.The analysis module extracted and split the forward information,and thus printed the suspicious network problem which can be used to track and located the problematic network node.The experiment results indicate that the proposed method is fairy efficient.