ONOS Intent Monitor and Reroute service: enabling plug&play routing logic

Software-Defined Networking (SDN) brought an unprecedented flexibility and programmability into computer networks. In order to simplify the management of an SDN network, several high-level languages have been proposed. The Intent Framework provided by Open Network Operating System (ONOS), for example, allows programmers to specify high-level policies without worrying about low-level device details, which are inferred by the controller. In addition, the Intent Framework ensures that the objective is met by transparently re-compiling the intents as a consequence of environment changes (e.g. link failures). In this work we extend the Intent Framework to make it able to both compile multiple intents together and to re-optimize their paths according to the network state based on flow statistics. We present Intent Monitor and Reroute service, a new ONOS module to optimize traffic forwarding of any ONOS applications based on intents, via an external plug&play routing logic with no modifications to ONOS applications at all. Finally we evaluate the benefits by enhancing the ONOS SDN-IP application with an adaptive Robust Traffic Engineering algorithm.