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Augmenting data center networks with a fast reconfigurable optical multistage interconnect

机译：通过快速可重新配置的光学多级互连增强数据中心网络

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The high bandwidth and power efficiency of optical circuit switching (OCS) have motivated the recent development of hybrid packet/circuit switched (Hypac) data center networks (DCNs). However, current Hypac DCNs use a large MEMS optical switch for OCS communication, which offers limited scalability and expandability. In addition, the slow switching speed of MEMS switches imposes considerable network reconfiguration overhead, which results in degraded network performance. In this paper, we first analyze the fundamental challenges in current MEMS-based Hypac DCNs, and show that fast optical network reconfiguration is the key to effectively utilize OCS in data center communication. We then present a Fast Reconfigurable Baseline Optical Network (FARBON), which, by leveraging the ultra-fast optical switching modules and unique topological properties of the baseline multistage network, allows for rapid network configuration. We also design the control plane and a practical low-jitter traffic scheduling algorithm for FARBON. We demonstrate that FARBON has many desirable features, such as good scalability, low traffic jitter, predictable network performance and tolerance to inaccurate traffic information. The performance of FARBON is evaluated via extensive simulations, and the results show that FARBON significantly outperforms MEMS optical switches in terms of average packet delay and jitter, as well as dealing with correlated traffic, thus is a promising candidate for exploiting the potential of OCS in Hypac DCNs.
机译：光电路交换（OCS）的高带宽和高功率效率推动了混合分组/电路交换（Hypac）数据中心网络（DCN）的最新发展。但是，当前的Hypac DCN使用大型MEMS光开关进行OCS通信，这限制了可扩展性和可扩展性。另外，MEMS开关的慢切换速度强加了相当大的网络重新配置开销，这导致网络性能下降。在本文中，我们首先分析了当前基于MEMS的Hypac DCN的基本挑战，并表明快速的光网络重新配置是在数据中心通信中有效利用OCS的关键。然后，我们提出一种快速可重新配置的基准光纤网络（FARBON），该基准网络通过利用超快速光纤交换模块和基准多级网络的独特拓扑属性，可以进行快速的网络配置。我们还为FARBON设计了控制平面和实用的低抖动流量调度算法。我们证明了FARBON具有许多理想的功能，例如良好的可伸缩性，低流量抖动，可预测的网络性能以及对不准确流量信息的容忍度。通过广泛的仿真评估了FARBON的性能，结果表明，在平均数据包延迟和抖动以及相关流量方面，FARBON的性能明显优于MEMS光开关，因此是开发OCS潜力的有前途的候选者。 Hypac DCN。

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