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On the controller placement for designing a distributed SDN control layer

机译:在用于设计分布式sDN控制层的控制器放置上

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摘要

The software-defined network (SDN) advocates a centralized network control, where a controller manages a network from a global view of the network. Large SDN networks may consist of multiple controllers or controller domains that distribute the network management between them, where each controller has a logically centralized but physically distributed vision of the network. In this context, a key challenge faced by providers is to define a scalable control network that exploits the benefits of SDN when used in conjunction with efficient management strategies. Most of the control layer models proposed are not concerned with controller scalability, because they assume that commercial controllers are scalable in terms of capacity (quantity of flows processed per second). However, it has been demonstrated that overloads and long propagation delays among controllers and controllers-switches can lead to a long response time of the controllers, affecting their ability to respond to network events in a very short time and reducing the reliability of communication. In this work we define the principles for designing a scalable control layer for SDN, and show the desired control layer characteristics that optimize the management of the network. We address these principles from the perspective of the controller placement problem. For this purpose we improve and evaluate our previous approach, the algorithm called k-Critical. K-Critical discovers the minimum number of controllers and their location to create a robust control topology that deals robustly with failures and balances the load among the selected controllers. The results demonstrate the effectiveness of our solution by comparing it with other controller placement solutions. © 2014 IFIP.
机译:软件定义网络(SDN)提倡集中式网络控制,其中控制器从网络的全局角度管理网络。大型SDN网络可能由多个控制器或控制器域组成,这些控制器或控制器域在它们之间分发网络管理,其中每个控制器都具有逻辑上集中但物理分布的网络视觉。在这种情况下,提供商所面临的主要挑战是定义可扩展的控制网络,该网络可与有效的管理策略结合使用,从而充分利用SDN的优势。提出的大多数控制层模型都与控制器可伸缩性无关,​​因为它们假定商用控制器在容量(每秒处理的流量)方面可伸缩。但是,已经证明,控制器和控制器-交换机之间的过载和长传播延迟会导致控制器的响应时间过长,从而影响它们在非常短的时间内响应网络事件的能力,并降低了通信的可靠性。在这项工作中,我们定义了为SDN设计可伸缩控制层的原理,并显示了可优化网络管理的所需控制层特性。我们从控制器放置问题的角度解决这些原则。为此,我们改进和评估了我们以前的方法,称为k-Critical的算法。 K-Critical发现了最少数量的控制器及其位置,以创建一个健壮的控制拓扑,该拓扑可有效处理故障并平衡所选控制器之间的负载。通过与其他控制器放置解决方案进行比较,结果证明了我们解决方案的有效性。 ©2014 IFIP。

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