RFC 1683 (rfc1683) - Page 3 of 12

Multiprotocol Interoperability In IPng

RFC 1683         Multiprotocol Interoperability In IPng      August 1994


             +-----------------------------------+
             |       File Transfer Service       |
             +-----------+-----------------------+
             |           |         FTAM          |
             |           +-----------------------+
             |   FTP     |       ISO 8823        |
             |           +-----------------------+
             |           |       ISO 8327        |
             |           +-----------+-----------+
             |           |TP0/RFC 1006|   TP4     |
             +-----------+-----------+           |
             |          TCP          |           |
             +-----------+-----------+-----------+
             |    IP     |         CLNP          |
             +-----------+-----------------------+


 Figure 1:  Multiprotocol architecture providing file-transfer service


   +-----------+     +-----------+     +-----------+     +-----------+
   |   FTP     |     |   FTAM    |     |   FTAM    |     |   FTP     |
   +-----------+     +-----------+     +-----------+     +-----------+
   |   TCP     |     | ISO 8823  |     | ISO 8823  |     |   TCP     |
   +-----------+     +-----------+     +-----------+     +-----------+
   |    IP     |     | ISO 8327  |     | ISO 8327  |     |   CLNP    |
   +-----------+     +-----------+     +-----------+     +-----------+
                     |   TP4     |     |TP0/RFC 1006|
                     +-----------+     +-----------+
                     |   CLNP    |     |   TCP     |
                     +-----------+     +-----------+
                                       |    IP     |
                                       +-----------+

    a) TCP/IP         b) OSI            c) RFC 1006       d) TUBA


      Figure 2:  Protocol stacks providing file-transfer service.

   Figure 2c depicts a mixed stack architecture that provides the upper
   layer OSI services using the Internet protocols.  This is an example
   of a "transition architecture" for providing OSI applications without
   requiring a full OSI implementation.  Figure 2d depicts a mixed stack
   architecture that provides the upper layer Internet applications
   using the OSI network protocol.  In addition to communicating with
   the two previous simple protocol stacks, the multiprotocol system of
   Figure 1 includes all the protocols necessary to communicate with
   these two new, mixed protocol stacks.



Clark, Ammar & Calvert