IP over HIPPI
RFC 2067

 
Document Type RFC - Draft Standard (January 1997; No errata)
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Network Working Group                                         J. Renwick
Request for Comments: 2067                                 NetStar, Inc.
Category: Standards Track                                   January 1997
Obsoletes: 1374

                             IP over HIPPI

Status of This Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Abstract

   ANSI Standard X3.218-1993 (HIPPI-LE[3]) defines the encapsulation of
   IEEE 802.2 LLC PDUs and, by implication, IP on HIPPI.  ANSI X3.222-
   1993 (HIPPI-SC[4]) describes the operation of HIPPI physical
   switches.  The ANSI committee responsible for these standards chose
   to leave HIPPI networking issues largely outside the scope of their
   standards; this document describes the use of HIPPI switches as IP
   local area networks.

   This memo is a revision of RFC 1374, "IP and ARP on HIPPI", and is
   intended to replace it in the Standards Track.  RFC 1374 has been a
   Proposed Standard since November, 1992, with at least 10
   implementations of IP encapsulation and HIPPI switch discipline.  No
   major changes to it are required.  However, the ARP part of RFC 1374
   has not had sufficient implementation experience to be advanced to
   Draft Standard.  The present document contains all of RFC 1374 except
   for the description ARP, which has been moved into a separate
   document.

TABLE OF CONTENTS

   1  Introduction.............................................  2
   2  Scope....................................................  3
      2.1   Changes from RFC 1374..............................  3
      2.2   Terminology........................................  4
   3  Definitions..............................................  4
   4  Equipment................................................  5
   5  Protocol ................................................  7
      5.1   Packet Format......................................  7
      5.2   48 bit Universal LAN MAC addresses................. 11
      5.3   I-Field Format..................................... 12

Renwick                     Standards Track                     [Page 1]
RFC 2067                     IP over HIPPI                  January 1997

      5.4   Rules For Connections.............................. 13
      5.5   MTU................................................ 15
   6  Camp-on ................................................. 16
   7  Path MTU Discovery....................................... 17
   8  Channel Data Rate Discovery.............................. 17
   9  Performance.............................................. 18
   10 Sharing the Switch....................................... 20
   11 References............................................... 21
   12 Security Considerations.................................. 21
   13 Author's Address......................................... 21
   14 Appendix A -- HIPPI Basics............................... 22
   15 Appendix B -- How to Build a Practical HIPPI LAN......... 27

1  Introduction

   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 bytes (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 "ftp.network.com"
   in the directory "hippi", and may be obtained via anonymous FTP.

   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.

Renwick                     Standards Track                     [Page 2]
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