--------------
      |  Controller  |
      | 198.51.100.1 |   ------     ------    ------     ------
       --------------   | SFI  |   | SFI  |  | SFI  |   | SFI  |
                        |SFT=41|   |SFT=42|  |SFT=41|   |SFT=43|
                         ------     ------    ------     ------
                              \     /              \     /
                             ---------            ---------
               ----------   |   SFF1  |          |   SFF2  |
   Packet --> |          |  |192.0.2.1|          |192.0.2.2|
   Flows  --> |Classifier|   ---------            ---------  -->Dest
              |          |                                   -->
               ----------    ---------            ---------
                            |   SFF3  |          |   SFF4  |
                            |192.0.2.3|          |192.0.2.4|
                             ---------            ---------
                              /     \              /     \
                         ------     ------    ------     ------
                        | SFI  |   | SFI  |  | SFI  |   | SFI  |
                        |SFT=42|   |SFT=44|  |SFT=43|   |SFT=44|
                         ------     ------    ------     ------