iFCP - A Protocol for Internet Fibre Channel Storage Networking

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RFC 4172           Internet Fibre Channel Networking      September 2005


   SOURCE N_PORT NAME:    Contains a copy of the SOURCE N_PORT NAME
                          specified in the CBIND request.

   DESTINATION N_PORT     Contains a copy of the DESTINATION N_PORT
   NAME:                  NAME specified in the CBIND request.

7.  Fibre Channel Link Services

   Link services provide a set of fibre channel functions that allow a
   port to send control information or request another port to perform a
   specific control function.

   There are three types of link services:

   a) Basic

   b) Extended

   c) ULP-specific (FC-4)

   Each link service message (request and reply) is carried by a fibre
   channel sequence and can be segmented into multiple frames.

   The iFCP layer is responsible for transporting link service messages
   across the IP network.  This includes mapping link service messages
   appropriately from the domain of the fibre channel transport to that
   of the IP network.  This process may require special processing and
   the inclusion of supplemental data by the iFCP layer.

   Each link service MUST be processed according to one of the following
   rules:

   a) Pass-through - The link service message and reply MUST be
      delivered to the receiving N_PORT by the iFCP protocol layer
      without altering the message payload.  The link service message
      and reply are not processed by the iFCP protocol layer.

   b) Special -  Applies to a link service reply or request requiring
      the intervention of the iFCP layer before forwarding to the
      destination N_PORT.  Such messages may contain fibre channel
      addresses in the payload or may require other special processing.

   c) Rejected - When issued by a locally attached N_PORT, the specified
      link service request MUST be rejected by the iFCP gateway.  The
      gateway SHALL return an LS_RJT response with a Reason Code of 0x0B
      (Command Not Supported), and a Reason Code Explanation of 0x0 (No
      Additional Explanation).




Monia, et al.               Standards Track                    [Page 55]