+-----------------------------------------+
         |         IPsec Management System         | I2NSF User
         +-----------------------------------------+
                             |
                             |  I2NSF Consumer-Facing Interface
                             |
         +-----------------------------------------+
         |           SPD and SAD Entries           | I2NSF
         |              Distribution               | Controller
         +-----------------------------------------+
                             |
                             |  I2NSF NSF-Facing Interface
                             |
         +-----------------------------------------+
         |             IPsec (SPD, SAD)            | Network
         |-----------------------------------------| Security
         |   IPsec Data Protection and Forwarding  | Function 
         +-----------------------------------------+