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The increase in the number of SDN-based deployments in production networks istriggering the need to consider fault-tolerant designs of controllerarchitectures. Commercial SDN controller solutions incorporate fault tolerance,but there has been little discussion in the SDN literature on the design ofsuch systems and the tradeoffs involved. To fill this gap, we present aby-construction design of a fault-tolerant controller, and materialize it byproposing and formalizing a practical architecture for small to medium-sizedscale networks. A central component of our particular design is a replicatedshared database that stores all network state. Contrary to the more commonprimary-backup approaches, the proposed design guarantees a smooth transitionin case of failures and avoids the need of an additional coordination service.Our preliminary results show that the performance of our solution fulfills thedemands of the target networks. We hope this paper to be a first step in whatwe consider a necessary discussion on how to build robust SDNs.

SMaRtLight: A Practical Fault-Tolerant SDN Controller