RFC 1374

Document Type RFC - Proposed Standard (October 1992; No errata)
Obsoleted by RFC 2834
Was draft-renwick-hippilan (individual)
Last updated 2013-03-02
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Network Working Group                                         J. Renwick
Request for Comments: 1374                                  A. Nicholson
                                                     Cray Research, Inc.
                                                            October 1992
                          IP and ARP on HIPPI

Status of this Memo

   This RFC specifies an IAB standards track protocol for the Internet
   community, and requests discussion and suggestions for improvements.
   Please refer to the current edition of the "IAB Official Protocol
   Standards" for the standardization state and status of this protocol.
   Distribution of this memo is unlimited.


   The ANSI X3T9.3 committee has drafted a proposal for the
   encapsulation of IEEE 802.2 LLC PDUs and, by implication, IP on
   HIPPI.  Another X3T9.3 draft describes the operation of HIPPI
   physical switches.  X3T9.3 chose to leave HIPPI networking issues
   largely outside the scope of their standards; this document discusses
   methods of using of ANSI standard HIPPI hardware and protocols in the
   context of the Internet, including the use of HIPPI switches as LANs
   and interoperation with other networks.  

Table of Contents

      Introduction                                                   2
      Scope                                                          2
      Definitions                                                    3
      Equipment                                                      4
      Protocol                                                       6

         Packet Format                                               6
         48 bit Universal LAN MAC addresses                         10
         I-Field Format                                             11
         Rules For Connections                                      13
         MTU                                                        15

      Camp-on                                                       16
      Address Resolution                                            16

         ARP and RARP Message Format                                17
         ARP Procedure                                              21
         ARP Implementation Methods                                 22

Renwick & Nicholson                                             [Page 1]
RFC 1374                  IP and ARP on HIPPI               October 1992

         ARP Example                                                23
         Discovery of One's Own Switch Address                      25

      Path MTU Discovery                                            27
      Channel Data Rate Discovery                                   27
      Performance                                                   29
      Sharing the Switch                                            31
      Appendix A -- HIPPI Basics                                    31
      Appendix B -- How to Build a Practical HIPPI LAN              37
      References                                                    41
      Security Considerations                                       42
      Authors' Addresses                                            42


   The ANSI High-Performance Parallel Interface (HIPPI) is a simplex
   data channel.  Configured in pairs, HIPPI can send and receive data
   simultaneously at nearly 800 megabits per second.  (HIPPI has an
   equally applicable 1600 megabit/second option.) Between 1987 and
   1991, the ANSI X3T9.3 HIPPI working group drafted four documents that
   bear on the use of HIPPI as a network interface.  They cover the
   physical and electrical specification (HIPPI-PH [1]), the framing of
   a stream of octets (HIPPI-FP [2]), encapsulation of IEEE 802.2 LLC
   (HIPPI-LE [3]), and the behavior of a standard physical layer switch
   (HIPPI-SC [4]).  HIPPI-LE also implies the encapsulation of Internet
   Protocol[5].  The reader should be familiar with the ANSI HIPPI
   documents, copies of which are archived at the site
   "nsco.network.com" in the directory "hippi," and may be obtained via
   anonymous FTP until they become published standards.

   HIPPI switches can be used to connect a variety of computers and
   peripheral equipment for many purposes, but the working group stopped
   short of describing their use as Local Area Networks.  This memo
   takes up where the working group left off, using the guiding
   principle that except for length and hardware header, Internet
   datagrams sent on HIPPI should be identical to the same datagrams
   sent on a conventional network, and that any datagram sent on a
   conventional 802 network[6] should be valid on HIPPI.


   This memo describes the HIPPI interface between a host and a
   crosspoint switch that complies with the HIPPI-SC draft standard.
   Issues that have no impact on host implementations are outside the
   scope of this memo.  Host implementations that comply with this memo
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