On the Design of Practical Fault-Tolerant SDN Controllers

Fabio Botelho, Alysson Bessani, Fernando M.V. Ramos, Paulo Ferreira
2014 2014 Third European Workshop on Software Defined Networks  
The increase in the number of SDN-based deployments in production networks is triggering the need to consider fault-tolerant designs of controller architectures. Commercial SDN controller solutions incorporate fault tolerance, but there has been little discussion in the SDN community on the design of such systems and the tradeoffs involved. To fill this gap, we present a by-construction design of a fault-tolerant controller, and materialize it by proposing and formalizing a practical
more » ... e for small to medium-sized networks. A central component of our design is a replicated shared database that stores all network state. Contrary to the more common primarybackup approaches, the proposed design guarantees a smooth transition in case of failures and avoids the need of an additional coordination service. Our preliminary results show that the performance of our solution fulfills the demands of the target networks. We hope this work to be a first step in what we consider a necessary discussion on how to build robust SDNs.
doi:10.1109/ewsdn.2014.25 dblp:conf/ewsdn/BotelhoBRF14 fatcat:bo5gjez6xzdgxgbkd2qfga5ao4