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Software Defined Networks (SDN) decouple the forwarding and control planesfrom each other. The control plane is assumed to have a global knowledge of theunderlying physical and/or logical network topology so that it can monitor,abstract and control the forwarding plane. In our paper, we present solutionsthat install an optimal or near-optimal (i.e., within 14% of the optimal)number of static forwarding rules on switches/routers so that any controllercan verify the topology connectivity and detect/locate link failures at dataplane speeds without relying on state updates from other controllers. Our upperbounds on performance indicate that sub-second link failure localization ispossible even at data-center scale networks. For networks with hundreds or fewthousand links, tens of milliseconds of latency is achievable.

On Diagnosis of Forwarding Plane via Static Forwarding Rules in Software Defined Networks