iFCP - A Protocol for Internet Fibre Channel Storage Networking

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RFC 4172           Internet Fibre Channel Networking      September 2005


                           +-------+----------+
                           |  FC   |          |
                           |  EOF  | EOF Code |
                           +-------+----------+
                           | EOFn  |   0x41   |
                           | EOFt  |   0x42   |
                           +-------+----------+

       Table 4. Translation of FC EOF Values to EOF Field Contents

   -EOF (bits 16-23 and 24-31 in word n): The -EOF fields contain the
   ones complement the value in the EOF fields.

   iFCP implementations SHALL place a copy of the SOF and EOF delimiter
   codes in the appropriate header fields.

5.3.3.  Frame Encapsulation

   A fibre channel Frame to be encapsulated MUST first be validated as
   described in [FC-FS].  Any frames received from a locally attached
   fibre channel device that do not pass the validity tests in [FC-FS]
   SHALL be discarded by the gateway.

   If the frame is a PLOGI ELS, the creation of an iFCP session, as
   described in Section 7.3.1.7, may precede encapsulation.  Once the
   session has been created, frame encapsulation SHALL proceed as
   follows.

   The S_ID and D_ID fields in the frame header SHALL be referenced to
   look up the iFCP session descriptor (see Section 5.2.2.2).  If no
   iFCP session descriptor exists, the frame SHALL be discarded.

   Frame types submitted for encapsulation and forwarding on the IP
   network SHALL have one of the SOF delimiters in Table 3 and an EOF
   delimiter from Table 4.  Other valid frame types MUST be processed
   internally by the gateway as specified in the appropriate fibre
   channel specification.

   If operating in address translation mode and processing a special
   link service message requiring the inclusion of supplemental data,
   the gateway SHALL format the frame payload and add the supplemental
   information specified in Section 7.1.  The gateway SHALL then
   calculate a new FC CRC on the reformatted frame.

   Otherwise, the frame contents SHALL NOT be modified and the gateway
   MAY encapsulate and transmit the frame image without recalculating
   the FC CRC.




Monia, et al.               Standards Track                    [Page 45]