On Reliability-optimized Controller Placement for Software-Defined Networks

作     者：HU Yannan WANG Wendong GONG Xiangyang QUE Xirong CHENG Shiduan 

作者机构：State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing 100876 PR.China 

出 版 物：《China Communications》 (中国通信（英文版）)

年 卷 期：2014年第11卷第2期

页      面：38-54页

核心收录：

学科分类：0810[工学-信息与通信工程] 0808[工学-电气工程] 07[理学] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 0839[工学-网络空间安全] 081201[工学-计算机系统结构] 0701[理学-数学] 0812[工学-计算机科学与技术（可授工学、理学学位）] 

基　　金：supported in part by the National High Technology Research and Development Program(863 Program)of China under Grant No.2011AA01A101 the National High Technology Research and Development Program(863 Program)of China under Grant No.2013AA01330 the National High Technology Research and Development Program(863 Program)of China under Grant No.2013AA013303 

主　　题：可靠性优化 网络管理 软件定义 控制器 放置 控制网络 SDN 数据平面 

摘      要：By decoupling control plane and data plane,Software-Defined Networking(SDN) approach simplifies network management and speeds up network innovations.These benefits have led not only to prototypes,but also real SDN deployments.For wide-area SDN deployments,multiple controllers are often required,and the placement of these controllers becomes a particularly important task in the SDN context.This paper studies the problem of placing controllers in SDNs,so as to maximize the reliability of SDN control networks.We present a novel metric,called expected percentage of control path loss,to characterize the reliability of SDN control networks.We formulate the reliability-aware control placement problem,prove its NP-hardness,and examine several placement algorithms that can solve this problem.Through extensive simulations using real topologies,we show how the number of controllers and their placement influence the reliability of SDN control networks.Besides,we also found that,through strategic controller placement,the reliability of SDN control networks can be significantly improved without introducing unacceptable switch-to-controller latencies.