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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 receive network data of a set of virtual links in real time during operation of the network. Each VR is configured to determine and dynamically adapt an optimal route through the network using the network data. At least one VR is configured to control routing of traffic flows through the network according to the optimal route, obviating routing based on pre-assigned link weights.