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The switching subsystem is considered a 'black box' in the R1 NC release providing a set of L1, L2, L3 and BGP networking services. As such any selection of switching hardware can be used that provides the necessary services described in detail in the R1 documentation Network Architecture.
In R1 the provisioning of the switching subsystem is considered a pre-requisite that is completed before the deployment of a Build Server, a Regional Controller and Rover and/or Edge pods. The R1 release does not configure the switching subsystem.