+--------------------------------------+ +-----------+
  |                         +-----+      | |           |
  |             DC      +---| SL2 |---+  | |    WAN    |
  |                     |   +-+-+-+   |  | |           |
  |                     |  in | | out |  | |           |
  |                     |   +-+-+-+   |  | |           |         .--.
  |                     |   | FW3 |   |  | |           |        (    )-.
  |   +----+ +----+ +---+-+ +-----+ +-+------+ +---+ +---+   .'        )
  |   |TOR1|-|Leaf|-|Spine|    :    |  DCI   |-| P |-|BR6|--(  Internet )
  |   +----+ +----+ +---+-+ +-----+ +-+------+ +---+ +---+   (        -'
  |    |                |   | FW5 |   |  | |           |       '-(     )
  |H12-+                |   +-+-+-+   |  | |           |          '---'
  |                     |  in | | out |  | |           |
  |                     |   +-+-+-+   |  | |           |
  |                     +---| SL4 |---+  | |           |
  |                         +-----+      | |           |
  +--------------------------------------+ +-----------+