Abstract: A system for configuring with an overlay configuration, a datacenter network of networking devices comprising at least an underlay fabric, an edge, and a ToR switch interconnecting one or several hosts on a rack, communicably connected to each other with an underlay configuration. The system comprises an API providing a user with a set of primitives providing instantiation capability of respective generic networking resources, the primitives being configured to be invoked and assembled by the user so as to provide an abstracted view of the overlay configuration. The system further comprises a Workflow engine to compute the overlay configuration according to the abstracted view, and an Overlay configuration builder to push the overlay configuration to the ToR switch and the edge. The pushed overlay configuration configures a NVE in the datacenter network as one of the ToR switch, depending on the business use case of the datacenter associated with the identity of the user.