+------------------------------+    +------------------------------+
|         PCE DOMAIN 1         |    |         PCE DOMAIN 2         |
|          +--------+          |    |          +--------+          |
|          |        |          |    |          |        |          |
|          | PCECC1 |  ---------PCEP---------- | PCECC2 |          |
|          |        |          |    |          |        |          |
|          |        |          |    |          |        |          |
|          +--------+          |    |          +--------+          |
|         ^          ^         |    |         ^          ^         |
|        /            \  PCEP  |    |  PCEP  /            \        |
|       V              V       |    |       V              V       |
| +--------+        +--------+ |    | +--------+        +--------+ |
| | Node11 |        | Node1n | |    | | Node21 |        | Node2n | |
| |        | ...... |        | |    | |        | ...... |        | |
| | PCECC  |        |  PCECC | |    | | PCECC  |        |PCECC   | |
| |Enabled |        | Enabled| |    | |Enabled |        |Enabled | |
| +--------+        +--------+ |    | +--------+        +--------+ |
|                              |    |                              |
+------------------------------+    +------------------------------+