/\
                           ||
                 +-------------------+       Centralized
                 | Network Controller|   Control & Management
                 +-------------------+
                           ||
                           \/
             o---------------------------o   Enhanced VPN #1
                           /-------------o
             o____________/______________o   Enhanced VPN #2
                        _________________o
                  _____/
             o___/     \_________________o   Enhanced VPN #3
                 \_______________________o
                        ......                  ...
             o-----------\ /-------------o
             o____________X______________o   Enhanced VPN #n

                __________________________
               /       o----o-----o      /
              /       /          /      /       NRP-1
             / o-----o-----o----o----o /
            /_________________________/
                __________________________
               /       o----o            /
              /       /    / \          /       NRP-2
             / o-----o----o---o------o /
            /_________________________/
                      ......                     ...
               ___________________________
              /             o----o       /
             /             /    /       /       NRP-m
            /  o-----o----o----o-----o /
           /__________________________/


              ++++   ++++   ++++
              +--+===+--+===+--+
              +--+===+--+===+--+
              ++++   +++\\  ++++
               ||     || \\  ||                Physical
               ||     ||  \\ ||                Network
       ++++   ++++   ++++  \\+++   ++++     Infrastructure
       +--+===+--+===+--+===+--+===+--+
       +--+===+--+===+--+===+--+===+--+
       ++++   ++++   ++++   ++++   ++++

  o    Virtual Node     ++++
                        +--+  Physical Node with resource partition
  --   Virtual Link     +--+
                        ++++
  ==  Physical Link with resource partition