US Patent 11606286 High performance software-defined core network

A system of nodes configured to form a network comprising virtual links in an overlay network provisioned over an underlay network including servers of a public network. The system includes virtual routers (VRs) at each node. Each VR is coupled to the network and to a tenant of the node, and configured to form in the network a set of virtual links corresponding to the tenant. One or more VRs includes a feedback control system comprising an objective function that characterizes the network. The VR is configured to receive link state data of the set of virtual links and control routing of a tenant traffic flow of each tenant according to a best route of the network determined by the objective function using the link state data.