HotSDN paper 2014 ONOS Towards an Open Distributed SDN OS.pdf

We present our experiences to date building ONOS (Open Network Operating System), an experimental distributed SDN control platform motivated by the performance, scalability, and availability requirements of large operator networks. We describe and evaluate two ONOS prototypes. The first version implemented core features: a distributed, butlogicallycentralized,globalnetworkview;scale-out;and fault tolerance. The second version focused on improving performance. Basedonexperiencewiththeseprototypes,we identify additional steps that will be required for ONOS to support use cases such as core network traffic engineering and scheduling, and to become a usable open source, distributed network OS platform that the SDN community can buildupon.