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OSA: An Optical Switching Architecture for Data
Center Networks With Unprecedented Flexibility
ABSTRACT:
A detailed examination of evolving traffic characteristics, operator
requirements, and network technology trends suggests a move away from
non-blocking interconnects in data center networks (DCNs). As a result,
recentefforts have advocated oversubscribed networks with the capability
to adapt to traffic requirements on-demand. In this paper, we present the
design, implementation, and evaluation of OSA, a novel Optical Switching
Architecture for DCNs. Leveraging runtime reconfigurable optical devices,
OSA dynamically changes its topology and link capacities, thereby
achieving unprecedented flexibility to adapt to dynamic traffic patterns.
Extensive analytical simulations using both real and synthetic traffic
patterns demonstrate that OSA can deliver high bisection bandwidth
(60%–100% of the non-blocking architecture). Implementation and
evaluation of a small-scale functional prototype further demonstrate the
feasibility of OSA.
EXISTING SYSTEM:
OSA employs the novel hop-by-hop stitching of multiple optical links to
provide overall connectivity for mice flows and bursty communications and
to handle workloads involving high fan-in/out hotspots that the existing
one-hop electrical/optical architectures cannot address efficiently via their
optical interconnects. OSA ensures that all the ToRs are in a connected

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graph and uses the hop-by-hop stitching of existing circuits to provide
overall network connectivity.
PROPOSED SYSTEM:
We proposed to dynamically configure 60-GHz short-distance multi-
Gigabit wireless links between ToRs to provide additional bandwidth for
hotspots. Optical and wireless interconnects provide different trade-offs.
For example, wired optical interconnects can deliver much more
bandwidth at lower power consumption over long distance, while the
wireless has lowercosts and is easierto deploy though the management and
interference are challenging issues to deal with. OSA is highly flexible
because it can adapt its topology as well as link capacities to different
traffic patterns. We have evaluated OSA via extensive simulations and
prototype implementation.
CONCLUSION:
We have presentedOSA, a novel Optical Switching Architecture for DCNs.
OSA is highly flexible because it can adapt its topology as well as link
capacities to different traffic patterns. We have evaluated OSA via
extensive simulations and prototype implementation. Our results suggest
that OSA can deliver high bisection bandwidth (60%–100% of the non-
blocking network) for a series of traffic patterns. Our implementation and
evaluation with the OSA prototype further demonstrate its feasibility.