Circuit switching under the radar with REACToR

Authors:
He Liu;Feng Lu;Alex Forencich;Rishi Kapoor;Malveeka Tewari;Geoffrey M. Voelker;George Papen;Alex C. Snoeren;George Porter
Affiliations:
University of California, San Diego;University of California, San Diego;University of California, San Diego;University of California, San Diego;University of California, San Diego;University of California, San Diego;University of California, San Diego;University of California, San Diego;University of California, San Diego
Venue:
NSDI'14 Proceedings of the 11th USENIX Conference on Networked Systems Design and Implementation
Year:
2014

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Abstract

The potential advantages of optics at high link speeds have led to significant interest in deploying optical switching technology in data-center networks. Initial efforts have focused on hybrid approaches that rely on millisecond-scale circuit switching in the core of the network, while maintaining the flexibility of electrical packet switching at the edge. Recent demonstrations of microsecond-scale optical circuit switches motivate considering circuit switching for more dynamic traffic such as that generated from a top-of-rack (ToR) switch. Based on these technology trends, we propose a prototype hybrid ToR, called REACToR, which utilizes a combination of packet switching and circuit switching to appear to end-hosts as a packet-switched ToR. In this paper, we describe a prototype REACToR control plane which synchronizes end host transmissions with end-to-end circuit assignments. This control plane can react to rapid, bursty changes in the traffic from end hosts on a time scale of 100s of microseconds, several orders of magnitude faster than previous hybrid approaches. Using the experimental data from a system of eight end hosts, we calibrate a hybrid network simulator and use this simulator to predict the performance of larger-scale hybrid networks.