Cube-based intra-datacenter networks with LOBS-HC

Electrical switching, when used to interconnect tens to hundreds of pods (each having a thousand of servers) in the core of a data center, incurs a high cost and power consumption and is expected to be replaced with optical switching soon. In this paper, we consider hypercube-based interconnection using optical switches in the core and study novel routing and wavelength assignment schemes for a new paradigm called Labeled Optical Burst Switching with Home Circuits (LOBS-HC). In particular, we propose a simple scheme called complementary HC assignment (CHA) for a 2-dimensional cube and ring, and extend the study to a n-cube (n > 2) and generalized hypercube (GHC) by applying the concept of Spanning Balanced Trees (SBTs). We determine the number of wavelengths (and transceivers) needed in each case and show that it can be significantly lower than that needed with conventional wavelength routing using optical circuit switching (OCS). We also show compared the proposed solution with other proposed electronic or hybrid switching based solutions.