title: How to run Opendaylight in Reactive mode?
body: <p>I use Opendaylight Nitrogen and it runs in proactive mode with L2-Switch module. Yet, somehow I couldnt find a clue how to make it work in reactive mode. </p>
  
  <p>The reason to do is I try to see FLOW_MOD messages after after PACKET_IN. I appreciate any kind of help. Thank you.</p>