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Survivor: An enhanced controller placement strategy for improving SDN survivability

机译：Survivor：增强的控制器放置策略，可提高SDN的生存能力

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摘要

In SDN, forwarding devices can only operate correctly while connected to a logically centralized controller. To avoid single-point-of-failure, controller architectures are usually implemented as distributed systems. In this context, recent literature identified fundamental issues, such as device isolation and controller overload, and proposed controller placement strategies to tackle them. However, current proposals have crucial limitations: (i) device-controller connectivity is modeled using single paths, yet in practice multiple concurrent connections may occur; (ii) peaks in the arrival of new flows are only handled on-demand, assuming that the network itself can sustain high request rates; and (iii) failover mechanisms require predefined information, which, in turn, has been overlooked. This paper proposes Survivor, a controller placement strategy that addresses these challenges. The strategy explicitly considers path diversity, capacity, and failover mechanisms at network design. Comparisons to the state-of-the-art on survivable controller placement show that Survivor is superior because (a) path diversity increases the survivability significantly; and (b) capacity-awareness is essential to handle overload during both normal and failover states.
机译：在SDN中，转发设备仅在连接到逻辑集中式控制器时才能正确运行。为了避免单点故障，控制器体系结构通常实现为分布式系统。在这种情况下，最近的文献确定了一些基本问题，例如设备隔离和控制器过载，并提出了解决这些问题的控制器放置策略。但是，当前的建议具有关键的局限性：（i）设备-控制器连接是使用单个路径建模的，但实际上可能会出现多个并发连接; （ii）假设网络本身可以维持较高的请求率，则仅按需处理新流到达的高峰; （iii）故障转移机制需要预定义的信息，而这些信息又被忽略了。本文提出了Survivor，这是一种应对这些挑战的控制器布置策略。该策略在网络设计时明确考虑路径多样性，容量和故障转移机制。与可生存控制器的最新技术水平的比较表明，生存者具有优越性，因为（a）路径多样性显着提高了生存能力; （b）容量意识对于在正常状态和故障转移状态下处理过载都是必不可少的。

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