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

Software-Defined Networking (SDN) brought an unprecedented flexibility and programmability into the network. In order to simplify the configuration of a SDN network, several high-level languages have been proposed. The Intent Framework provided by Open Network Operating System (ONOS), for ex- ample, allows programmers to specify high-level policies without worrying about the low-level device configurations, which are compiled by the controller. In addition, the Intent Framework ensures that the objective is met by transparently re-compile the intents as a consequence of environment changes (e.g. link failures). In this work we want to extend the Intent Framework to make it able to jointly compile multiple intents together and to re- optimize their paths according to events based on flow statistics. We present Intent Monitor and Reroute service, a new ONOS module to optimize the forwarding of any ONOS applications based on Intents, via an external plug&play routing logic with minimal modifications to the application. Finally we evaluate the benefits by enhancing the ONOS SDN-IP application with an adaptive Robust Traffic Engineering algorithm.