+------------------+
      +---------->       PCE        <-----------+
      |          +------------------+           |
      |                  +--+                   |
      +------------------+R3+-------------------+
PCInitiate/PCRpt         +--+             PCInitiate/PCRpt
      |                                         |
     +v-+          +--+          +--+         +-v+
     |R1+----------+R5+----------+R6+---------+R7|
     ++-+          +--+          +--+         +-++
 (BGP Router)                           (BGP Router)
      |                                         |
      |                                         |
      |            +--+          +--+           |
      +------------+R2+----------+R4+-----------+
                   +--+          +--+