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INCEPT: INcremental ControllEr PlacemenT in Software Defined Networks

机译：incept：软件定义网络中的增量控制器放置

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摘要

In almost a decade, Software Defined Networking (SDN) has transitioned from university laboratories to real-life networks. As networks evolve from legacy networks to hybrid OSPF/SDN networks to pure SDN networks, the associated challenge of appropriate controller placement - i.e. optimal count and location of controllers in an SDN network - need to be suitably addressed. Several studies investigated the controller placement problem at a point in time primarily from a latency minimization approach, in addition to various secondary objectives. However, considering long-term network growth, it is also important to evaluate the best timing to introduce a controller in an SDN network. In this paper, we introduce and formulate the incremental (multi-period) controller placement problem to add controllers in an SDN network in a phased manner over a finite planning horizon. We consider a practical scenario with increasing network traffic, as well as falling capital and operational expenditures of SDN controllers on account of vendor competition and technology maturity. We propose a multi-objective optimization model to derive the optimal multi-period controller roll-out plan. Using extensive simulations, we evaluate our solution in terms of various performance metrics and find that our multi-period placement schedule attains significant cost savings over single-period placement schedule at the cost of a small and acceptable increase in switch-controller latency.
机译：在近十年中，软件定义的网络（SDN）已从大学实验室转变为现实生活网络。随着网络从传统网络到混合OSPF / SDN网络到纯SDN网络，适当的控制器放置的相关挑战 - 即SDN网络中的控制器的最佳计数和位置 - 需要适当地解决。除了各种次要目标之外，还研究了主要从潜伏最小化方法的时间点调查了控制器放置问题。然而，考虑到长期网络增长，评估在SDN网络中引入控制器的最佳时机也很重要。在本文中，我们介绍和制定增量（多时段）控制器放置问题，以便在有限的规划地平线上以相控方式在SDN网络中添加控制器。我们考虑到网络流量增加的实际情况，并考虑到供应商竞争和技术成熟，以及SDN控制器的资本和运营支出下降。我们提出了一种多目标优化模型来得出最佳的多周期控制器推出计划。使用广泛的模拟，我们在各种绩效指标方面评估我们的解决方案，并发现我们的多个时期安置时间表在单期放置时间表上以小而可接受的开关控制器延迟的成本实现了大量成本节省。

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