+--------------------------- DC1 ----------------------------+
|                          +-----+                           |
|                          | SF1 |                           |
|                          +--+--+                           |
|                             |                              |
|                             |                              |
|        +------------+       |    +------------+            |
|        | N(100,255) |       |    | N(100,254) |            |
|        +------------+       |    +------------+            |
|        | F:Inner Pkt|       |    | F:Inner Pkt|            |
|        +------------+  ^    |  | +------------+            |      
|                    (2) |    |  | (3)                       |
|                        |    |  v                           |
|                  (1)        |         (4)                  |
|+------------+   ---->    +--+---+    ---->     +---------+ |
||            |    NSH     |      |     NSH      |         | |
|| Classifier +------------+ SFF1 +--------------+ DC1-GW1 + |
||            |            |      |              |         | |
|+------------+            +------+              +---------+ |
|                                                            |
|             +------------+       +------------+            |
|             | N(100,255) |       | N(100,254) |            |
|             +------------+       +------------+            |
|             | F:Inner Pkt|       | F:Inner Pkt|            |
|             +------------+       +------------+            |
|                                                            |
+------------------------------------------------------------+