+-----------------------------------------------------------------+
|                                         Hierarchy Abstraction   |
|                                                                 |
| +-----------------------+                    Service Model      |
| |    Orchestrator       |                 (Customer Oriented)   |
| |+---------------------+|               Scope: "1:1" Pipe model |
| ||  Service Modeling   ||                                       |
| |+---------------------+|                                       |
| |                       |                   Bidirectional       |
| |+---------------------+|              +-+  Capacity, OWD +-+   |
| ||Service Orchestration||              | +----------------+ |   |
| |+---------------------+|              +-+                +-+   |
| +-----------------------+            Ingress             Egress |
|                                                                 |
|                                                                 |
| +-----------------------+                Network Model          |
| |   Controller          |             (Operator Oriented)       |
| |+---------------------+|           +-+    +--+    +---+   +-+  |
| || Network Modeling    ||           | |    |  |    |   |   | |  |
| |+---------------------+|           | o----o--o----o---o---o |  |
| |                       |           +-+    +--+    +---+   +-+  |
| |+---------------------+|           src                    dst  |
| ||Network Orchestration||                L3VPN over TE          |
| |+---------------------+|        Instance Name/Access Interface |
| +-----------------------+      Protocol Type/Capacity/RD/RT/... |
|                                                                 |
|                                                                 |
| +-----------------------+                 Device Model          |
| |    Device             |                                       |
| |+--------------------+ |                                       |
| || Device Modeling    | |           Interface add, BGP Peer,    |
| |+--------------------+ |              Tunnel ID, QoS/TE, ...   |
| +-----------------------+                                       |
+-----------------------------------------------------------------+