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An optical circuit-switched network core has the potential to overcome theinherent challenges of a conventional electrical packet-switched core oftoday's compute clusters. As optical circuit switches (OCS) directly handle thephoton beams without any optical-electrical-optical (O/E/O) conversion andpacket processing, OCS-based network cores have the following desirableproperties: a) agnostic to data-rate, b) negligible/zero power consumption, c)no need of transceivers, d) negligible forwarding latency, and e) no need forfrequent upgrade. Unfortunately, OCS can only provide point-to-point (unicast)circuits. They do not have built-in support for one-to-many (multicast)communication, yet multicast is fundamental to a plethora of data-intensiveapplications running on compute clusters nowadays. In this paper, we proposeShufflecast, a novel optical network architecture for next-generation computeclusters that can support high-performance multicast satisfying all theproperties of an OCS-based network core. Shufflecast leverages small fanout,inexpensive, passive optical splitters to connect the Top-of-rack (ToR) switchports, ensuring data-rate agnostic, low-power, physical-layer multicast. Wethoroughly analyze Shufflecast's highly scalable data plane, light-weightcontrol plane, and graceful failure handling. Further, we implement a completeprototype of Shufflecast in our testbed and extensively evaluate the network.Shufflecast is more power-efficient than the state-of-the-art multicastmechanisms. Also, Shufflecast is more cost-efficient than a conventionalpacket-switched network. By adding Shufflecast alongside an OCS-based unicastnetwork, an all-optical network core with the aforementioned desirableproperties supporting both unicast and multicast can be realized.

Shufflecast: An Optical, Data-rate Agnostic and Low-Power Multicast Architecture for Next-Generation Compute Clusters