iFCP - A Protocol for Internet Fibre Channel Storage Networking

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RFC 4172           Internet Fibre Channel Networking      September 2005


4.6.  Operation in Address Translation Mode

   This section describes the process for managing the assignment of
   addresses within a gateway region that is part of an unbounded iFCP
   fabric, including the modification of FC frame addresses embedded in
   the frame header for frames sent and received from remotely attached
   N_PORTs.

   As described in Section 4.4, the scope of N_PORT addresses in this
   mode is local to the gateway region.  A principal switch within the
   gateway region, possibly the iFCP gateway itself, oversees the
   assignment of such addresses, in accordance with the rules specified
   in [FC-FS] and [FC-FLA].

   The assignment of N_PORT addresses to locally attached devices is
   controlled by the switch element to which the device is connected.

   The assignment of N_PORT addresses for remotely attached devices is
   controlled by the gateway by which the remote device is accessed.  In
   this case, the gateway MUST assign a locally significant N_PORT alias
   to be used in place of the N_PORT ID assigned by the remote gateway.
   The N_PORT alias is assigned during device discovery, as described in
   Section 5.2.2.1.

   To perform address conversion and to enable the appropriate routing,
   the gateway MUST establish an iFCP session and generate the
   information required to map each N_PORT alias to the appropriate
   TCP/IP connection context and N_PORT ID of the remotely accessed
   N_PORT.  These mappings are created and updated by means specified in
   Section 5.2.2.2.  As described in that section, the required mapping
   information is represented by the iFCP session descriptor reproduced
   in Figure 8.

                      +-----------------------+
                      |TCP Connection Context |
                      +-----------------------+
                      |  Local N_PORT ID      |
                      +-----------------------+
                      |  Remote N_PORT ID     |
                      +-----------------------+
                      |  Remote N_PORT Alias  |
                      +-----------------------+

      Figure 8. iFCP Session Descriptor (from Section 5.2.2.2)







Monia, et al.               Standards Track                    [Page 27]