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A method and apparatus are disclosed herein for topology and/or path verification in networks. In one embodiment, a method is disclosed for use with a pre-determined subset of network flows for a communication network, where the network comprises a control plane, a forwarding plane, and one or more controllers. The method comprises installing forwarding rules on the forwarding elements for identification of network information, wherein the forwarding rules are grouped into one or more separate control flows, where each of the one or more control flows makes a closed loop walk through at least a portion of the network according to the forwarding rules of said each control flow, injecting traffic for one or more control flows onto the forwarding plane, and identifying the network information based on results of injecting the traffic.