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| A K self-adaptive SDN controller placement for wide area networks |
| Peng Xiao, Zhi-yang Li, Song Guo, Heng Qi, Wen-yu Qu, Hai-sheng Yu |
| School of Information Science and Technology, Dalian Maritime University, Dalian 116026, China; School of Information Science and Engineering, Dalian Polytechnic University, Dalian 116034, China; School of Computer Science and Engineering, The University of Aizu, Aizuwakamatsu 965-8580, Japan; School of Computer Science and Technology, Dalian University of Technology, Dalian 116024, China; School of Computer Software, Tianjin University, Tianjin 300072, China |
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Abstract As a novel architecture, software-defined networking (SDN) is viewed as the key technology of future networking. The core idea of SDN is to decouple the control plane and the data plane, enabling centralized, flexible, and programmable network control. Although local area networks like data center networks have benefited from SDN, it is still a problem to deploy SDN in wide area networks (WANs) or large-scale networks. Existing works show that multiple controllers are required in WANs with each covering one small SDN domain. However, the problems of SDN domain partition and controller placement should be further addressed. Therefore, we propose the spectral clustering based partition and placement algorithms, by which we can partition a large network into several small SDN domains efficiently and effectively. In our algorithms, the matrix perturbation theory and eigengap are used to discover the stability of SDN domains and decide the optimal number of SDN domains automatically. To evaluate our algorithms, we develop a new experimental framework with the Internet2 topology and other available WAN topologies. The results show the effectiveness of our algorithm for the SDN domain partition and controller placement problems.
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Received: 21 October 2015
Published: 05 July 2016
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一种K自适应的广域网SDN控制器部署方法
目的：软件定义网络（software-defined networking）作为一种新技术框架，正成为未来网络技术的核心。软件定义网络的核心思想就是控制平面和数据平面分离，方便管理和控制编程。虽然软件定义网络已在数据中心这样的局域网中得到了应用和部署，但在更大规模的广域网上部署依然面临着很多问题，如SDN域划分、控制器部署等问题。本文提出了一种基于谱的SDN控制器部署方法，通过此方法能将较大的网络划分成小的SDN域并选择其控制器位置。通过分析模型的矩阵扰动和本征间隙，能够自动得到SDN域个数，以达到较好的划分效果和控制器部署方案。
创新点：提出基于谱的SDN控制器部署模型，以解决广域网SDN域划分及控制器部署问题；通过分析模型，提出一种K自适应的广域网SDN控制器部署方法，能够自动得到SDN域个数，以达到较好的划分效果和控制器部署方案。
方法：通过分析模型的矩阵扰动和本征间隙，能够自动得到SDN域个数，以达到较好的划分效果和控制器部署方案。结合广域网拓扑和SDN平台建立了仿真实验框架，利用该框架进行相关实验，验证模型的准确性和有效性。
结论：本文的方法能较好的解决SDN域划分和控制器部署问题（图3、5）。K自适应方法所得到的结果与实际划分效果一致（图6-11）。
关键词：
软件定义网络,
控制器部署,
K自适应方法
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