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On Reliability-optimized Controller Placement for Software-Defined Networks

china Communications 2014年第2期11卷 38-54页

作者： HU Yannan WANG Wendong GONG Xiangyang QUE Xirong CHENG Shiduan State Key Laboratory of Networking and Switching technology Beijing University of Posts and Telecommunications Beijing 100876 PR.China

By decoupling control plane and data plane,Software-Defined Networking(SDN) approach simplifies network management and speeds up network *** benefits have led not only to prototypes,but also real SDN *** wide-area SDN deployments,multiple controllers are often required,and the placement of these controllers becomes a particularly important task in the SDN *** paper studies the problem of placing controllers in SDNs,so as to maximize the reliability of SDN control *** present a novel metric,called expected percentage of control path loss,to characterize the reliability of SDN control *** formulate the reliability-aware control placement problem,prove its NP-hardness,and examine several placement algorithms that can solve this *** extensive simulations using real topologies,we show how the number of controllers and their placement influence the reliability of SDN control ***,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.

关键词：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

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Autonomic QoS Management Mechanism in Software Defined Network

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china Communications 2014年第7期11卷 13-23页

作者： WANG Wendong QI Qinglei GONG Xiangyan HU Yannan QUE Xirong State Key Laboratory of Network and Switching technology Beijing University of Posts and TelecommunicationsBeijing 100876 P.R. China

With the increase of network complexity,the flexibility of network control and management becomes a nontrivial *** Software Defined Network(SDN) and Autonomic Network technologies are sophisticated technologies for the network control and *** two technologies could be combined together to construct a software defined self-managing solution for the future *** autonomic QoS management mechanism in Software Defined Network(AQSDN) is proposed in this *** AQSDN,the various QoS features can be configured autonomically in an OpenFlow switch through extending the OpenFlow and OF-Config *** on AQSDN,a novel packet context-aware QoS model(PCaQoS) is also introduced for improving the network *** takes packet context into account when packet is marked and managed into forwarding *** implementation of a video application's prototype which evaluates the self-configuration feature of the AQSDN and the enhancement ability of the PCaQoS is presented in order to validate this design.

关键词：网络控制管理机制软件定义 QoS 神经网络技术网络服务质量视频应用程序数据包标记

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