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On reliability-optimized controller placement for Software-Defined Networks

机译:关于软件定义网络的可靠性优化的控制器放置

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By decoupling control plane and data plane, Software-Defined Networking (SDN) approach s i m p l i f i e s 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.
机译:通过将控制平面和数据平面分离,软件定义网络(SDN)可以简化网络管理并加速网络创新。这些好处不仅带来了原型,还带来了真正的SDN部署。对于广域SDN部署,通常需要多个控制器,并且在SDN上下文中,这些控制器的放置成为一项特别重要的任务。本文研究了在SDN中放置控制器的问题,以最大化SDN控制网络的可靠性。我们提出了一种新的度量标准,称为控制路径损耗的预期百分比,以表征SDN控制网络的可靠性。我们制定了可靠性感知控件放置问题,证明了其NP硬度,并研究了可以解决该问题的几种放置算法。通过使用真实拓扑的广泛仿真,我们展示了控制器的数量及其放置方式如何影响SDN控制网络的可靠性。此外,我们还发现,通过战略性地布置控制器,可以显着提高SDN控制网络的可靠性,而不会引入不可接受的开关到控制器延迟。

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