基于OpenFlow的SDN中链路层拓扑发现的优化  

Optimization of Link Layer Topology Discovery in SDN Based on OpenFlow

作　　者：董帅 张安琳 黄道颖 王宣立 刘江豪 DONG Shuai;ZHANG An-lin;HUANG Dao-ying;WANG Xuan-li;LIU Jiang-hao(College of Computer and Communication Engineering,Zhengzhou University of Light Industry,Zhengzhou 450000,China;Engineering Training Center,Zhengzhou University of Light Industry,Zhengzhou 450000,China)

机构地区：[1]郑州轻工业大学计算机与通信工程学院,郑州450000 [2]郑州轻工业大学工程训练中心,郑州450000

出　　处：《火力与指挥控制》2020年第8期148-153,共6页Fire Control & Command Control

基　　金：国家科技支撑计划基金(2006BAK01A38);河南省教育厅基础研究项目(15A120020)。

摘　　要：在基于OpenFlow的软件定义网络中,控制器需要对全局网络状态保持全面并且实时的掌握,怎样快速地获取当前网络的拓扑状态成为了重要前提。而SDN的拓扑发现协议OFDP虽然已经将控制权交给了控制器,但是仍采用洪泛式的拓扑发现消息发送机制来进行拓扑发现,没有达到全局最优,增加了不必要的开销。因此,提出一种基于OFDP的改进机制,在控制器中添加新的拓扑发现功能模块,通过减少重复端口发现的方式,来减少网络中的拓扑发现消息的数量。仿真实验结果表明,改进机制在加快了网络拓扑的生成的同时,减轻了控制器的负载。In Open Flow-based software-defined network,the controller needs to maintain a comprehensive and real-time grasp of the global network state,therefore,how to quickly obtain the topology status of the current network has become an important prerequisite Although the topology discovery protocol OFDP of SDN has already given control right to the controller,it still uses the flooded topology discovery message sending mechanism to perform topology discovery,which does not reach global optimization and increases unnecessary overhead.Therefore,an improved mechanism based on OFDP is proposed.A new topology discovery function module is added to the controller,and number of topology discovery messages in the network is reduced by reducing the way of duplicate port discovery.The simulation results show that the improved mechanism speeds up the generation of the network topology and reduces the load on the controller at the same time.

关 键 词：软件定义网络 OpenFlow发现协议 拓扑发现 控制器 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]