Efficient Bandwidth Allocation in the NEPHELE Optical/Electrical Datacenter Interconnect
K. Christodoulopoulos, Konstantinos Kontodimas, A. Siokis, K. Yiannopoulos, Emmanouel Varvarigos · Journal of Optical Communications and Networking · 2017
The NEPHELE data center interconnection network relies on hybrid electro-optical top-of-rack switches to interconnect servers over multi-wavelength optical rings. The bandwidth of the rings is shared, and an efficient utilization of the infrastructure calls for co-ordination in the time, space, and wavelength domains. To this end, we present offline and incremental dynamic resource assignment algorithms. The algorithms are suitable for implementation in a software defined network control plane, achieving efficient, collision-free, and on demand capacity use. Our simulation results indicate that the proposed algorithms can achieve high utilization and low latency in a variety of traffic scenarios that include hot spots and/or rapidly changing traffic.