|
     packet | going
   down the | stack
 +==========v==========+=====================+===================+
 |(In-situ OAM + iCTRL)| (L2 Triggers, DLEP) |   (Hybrid OAM)    |
 +==========v==========+=====================+===================+
 |     Learn from      |                     |    Learn from     |
 |    packet tagging   >       Maintain      <    end-to-end     |
 +----------v----------+      Forwarding     |    OAM packets    |
 | Forwarding decision <        State        +---------^---------|
 +----------v----------+                     |      Enrich or    |
 +    Retag Packet     |  Learn abstracted   >     Regenerate    |
 |    and Forward      | metrics about Links |     OAM packets   |
 +..........v..........+..........^..........+........^.v........+
 |                          Lower layers                         |
 +..........v.....................^...................^.v........+
      frame | sent          Frame | L2 Ack     Active | | OAM
       over | wireless        In  |            In and | |  out
            v                     |                   | v