THOR : A Scalable Hybrid Switching Architecture for Data Centers

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

7 Scopus Citations
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Detail(s)

Original languageEnglish
Pages (from-to)4653-4665
Journal / PublicationIEEE Transactions on Communications
Volume66
Issue number10
Online published30 Apr 2018
Publication statusPublished - Oct 2018

Abstract

Optical interconnects are emerging as a high bandwidth and low energy alternative to traditional electrical networks. However, most exiting designs put optical switching in the core layer due to issues including limited scalability, potential bottleneck of the control plane, and high cost of the multiwavelength switch. To this end, we propose THOR, a hybrid network architecture using optical interconnects as the main load bearing portion. It employs the hypercube topology and multi-hop circuit switching to enable server-level optical access, thus solving the scalability and connectivity limitations. Then in order to build a faster control plane operating short-lived circuits in a large scale, THOR uses a distributed control system over the electrical network, with a new path setup mechanism capable of establishing multiple optical circuits concurrently. Moreover THOR employs a novel optical switch design to utilize multiple wavelengths more efficiently. Our evaluation results show that THOR consumes at least 59% and 6% less power than existing electrical and optical designs. For performance, THOR is able to deliver 90% bisection bandwidth of a non-blocking network and reduce the end-to-end latency significantly. Lastly, by separately delivering mice and elephant flows, THOR achieves salient improvements in average flow completion times compared to existing approaches.

Research Area(s)

  • Bandwidth, Network topology, Networks, optical communication, Optical fiber networks, Optical interconnections, Optical switches, optical switches, routing, Switching circuits, Topology, topology

Citation Format(s)

THOR : A Scalable Hybrid Switching Architecture for Data Centers. / Yu, Xiaoshan; Xu, Hong; Gu, Huaxi; Lan, Hao.

In: IEEE Transactions on Communications, Vol. 66, No. 10, 10.2018, p. 4653-4665.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review