OCS enables aggregation block switches devices addition, draining or removal even if they are of a new generation and different port speed without the need for high-risk and high-cost actions of replacing all Spines (for uplink speed increase) and physical recabling of the fabric, that CLOS fabric implies. It also shows that hardware upgrades and the scale-out of Jupiter fabric are much easier with OCS. Google paper ( Jupiter Evolving: Transforming Google’s Datacenter Network via Optical Circuit Switches and Software-Defined Networking) that was presented at the SIGCOMM’22 conference describes how getting rid of Spines, and smart traffic handling with SDN, enabled the Jupiter fabric to get up to 5x higher speed and capacity and 40% reduction in power consumption in relation to similar CLOS topology datacenter fabrics. SDN is used for BUM traffic handling (Broadcast, unknown-unicast and multicast traffic) that was the other important spine role. Spine switch roles are basically replaced with OCS devices for smart, dynamic and direct interconnections of Leafs. OCS MEMS mirror array can redirect light from any input port to any output port by slightly moving one of its mirrors and changing dynamically optical connections between aggregation blocks
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