Conference paper Open Access
K. Christodoulopoulos; K. Kontodimas; A. Siokis; K. Yiannopoulos; E. Varvarigos
The NEPHELE datacenter network is divided into pods/clusters of racks and relies on hybrid electro-optical top-of rack switches that access an all-optical network consisting of WDM rings. To enable dynamic and efficient sharing of the optical resources and a collision-free network operation, the NEPHELE network is envisioned to be operated in a slotted TDMA manner with a software-defined-network (SDN) based control plane. We describe the NEPHELE resource allocation problem, describe the wavelength conflicts on the shared WDM rings, translate those into resource allocation constraints and discuss on the effect of these constraints on the network performance. To do so, we define the worst-case traffic and perform simulations to evaluate their effect on average traffic. Finally, we propose a variation to the NEPHELE architecture that reduces the effects of these wavelength conflict constraints.
_Collisions Free Scheduling in the NEPHELE Hybrid.pdf