SDN控制平面中控制器放置算法综述

Survey of Controller Placement Algorithms in SDN Control Plane

软件定义网络SDN是一种转发与控制分离的新型网络架构,其灵活可编程的网络服务可以使得网络的管理更加便捷,使得网络的使用更加高效。随着网络规模的扩大,SDN逻辑集中的单控制器逐渐不能满足网络性能的要求,控制平面开始向着多控制器方向发展。针对多控制器控制平面中的控制器放置问题相关研究进行了充分的调研和学习,本文在介绍已有多控制器架构的基础上,对现有的控制器放置算法进行了详细的介绍,分别通过优化方法和优化目标进行分类总结,点明核心思想和优缺点。在此基础上,结合现有工作,对控制器放置未来可能的研究方向进行阐述,为后续相关研究提供指导。

Software-defined network(SDN)is a new network architecture that separates forwarding and control.Its flexible and programmable network services can make network management more convenient and make communication more efficient.With the expansion of the network scale,the single controller which is logically centralized in the SDN gradually cannot meet the requirements of network performance,so the control plane begins to develop in the direction of the multi-controller.This paper conducts sufficient research and study on the related works on the controller placement problem in the multi-controller control plane.On the basis of introducing the existing multi-controller architecture,the existing controller placement algorithm is introduced in detail.Classify and summarize through optimization methods and optimization objectives,and point out the core ideas,advantages,and disadvantages.On this basis,combined with the existing work,the possible future research directions of controller placement are expounded to provide guidance for subsequent related research.