The neutron northbound project is focused on the communication from the ODL drivers in OpenStack to the ODL neutron service and saves the neutron models into ODL data store for other providers to use. It does not include direct manipulation of low-level network/overlay elements - these are left to the providers that receive information from this project
In Oxygen release followings are main deliverables

• tap-asS(tap as a Service): Port mirroring api
• minimum bandwidth QoS Rule
• various code clean up(checkstyle, findbugs, pom cleanup)