iFCP - A Protocol for Internet Fibre Channel Storage Networking

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RFC 4172           Internet Fibre Channel Networking      September 2005


   c) If word 0, bit 18 (Third Party Originator N_PORT ID validity), in
      the TPRLO flags field has a value of one, then the sender shall
      place the worldwide port name of the fibre channel device's N_PORT
      in the extension words.  The N_PORT ID SHALL be set to 3.
      Otherwise, the contents of the extension words and the Third Party
      Originator N_PORT ID SHALL be set to zero.

   d) The ELS originator SHALL set the SPC bit in the encapsulation
      header of each augmented frame comprising the ELS (see Section
      5.3.1).

   e) If the ELS contains a single TPRLO parameter page, the originator
      SHALL increase the frame length as necessary to include the
      extended parameter page.

   f) If the ELS to be augmented contains multiple TPRLO parameter
      pages, the FC frames created to contain the augmented ELS payload
      SHALL NOT exceed the maximum frame size that can be accepted by
      the destination N_PORT.

      Each fibre channel frame SHALL contain an integer number of
      extended TPRLO parameter pages.  The maximum number of extended
      TPRLO parameter pages in a frame SHALL be limited to the number
      that can be held without exceeding the above upper limit.  New
      frames resulting from the extension of the TPRLO pages to include
      the supplemental data SHALL be created by extending the SEQ_CNT in
      the fibre channel frame header.  The SEQ_ID SHALL NOT be modified.

   The gateway receiving the augmented TPRLO ELS SHALL generate ELS
   frames to be sent to the destination N_PORT by copying word 0 of the
   ELS payload and processing each augmented parameter page as follows:

   a) If word 0, bit 18, has a value of one, create a parameter page by
      copying words 0 through 2 of the augmented parameter page.  The
      Third Party Originator N_PORT ID in word 3 shall be generated by
      referencing the supplemental data as described in Section 7.2.

   b) If word 0, bit 18, has a value of zero, create a parameter page by
      copying words 0 through 3 of the augmented parameter page.

   The size of each frame to be sent to the destination N_PORT MUST NOT
   exceed the maximum frame size that the destination N_PORT can accept.
   The sequence identifier in each frame header SHALL be copied from the
   augmented ELS, and the sequence count SHALL be monotonically
   increasing.






Monia, et al.               Standards Track                    [Page 82]