+-----+      +---+      +-----+           +--+            +--+
|MAAR1|      |CMD|      |MAAR2|           |CN|            |CN|
+-----+      +---+      +-----+           +*-+            +*-+
   |           |           |               *               *
   |           |          MN               *     +---+     *
   |           |        attach.        *****    _|CMD|_    *
   |           |          det.   flow1 *       / +-+-+ \   *flow2
   |           |<-- PBU ---|           *      /    |    \  *
   |          BCE          |           *     /     | *******
   |        check+         |           *    /      | *    \
   |        update         |       +---*-+-'    +--+-*+    `+-----+
   |<-- PBU*---|           |       |   * |      |    *|     |     |
route          |           |       |MAAR1|______|MAAR2+-----+MAAR3|
update         |           |       |   **(______)**  *|     |     |
   |--- PBA*-->|           |       +-----+      +-*--*+     +-----+
   |         BCE           |                      *  *
   |        update         |                Pref1 *  *Pref2
   |           |--- PBA*-->|                     +*--*+
   |           |         route         ---move-->|*MN*|
   |           |         update                  +----+

      Operations sequence                  Data Packet flow
PBU/PBA messages with * contain
     a new mobility option