     <-------------------- DetNet IP ------------------------>
                                 ______
                       ____     /      \__
            ____      /     \__/          \___   ______
+----+   __/    +====+                       +==+      \     +----+
|src |__/ Sub-N1 )   |                       |  \ Sub-N3\____| dst|
+----+  \_______/    \      Sub-network 2    |   \______/    +----+
                      \_                    _/
                        \         __     __/
                         \_______/  \___/


          +---+        +---------E--------+      +-----+
+----+    |   |        |         |        |      |     |      +----+
|src |----R   E--------R     +---+        E------R     E------+ dst|
+----+    |   |        |     |            |      |     |      +----+
          +---+        +-----R------------+      +-----+