OSI CLNS and LLC1 protocols on Network Systems HYPERchannel
RFC 1223

Document Type RFC - Informational (May 1991; No errata)
Last updated 2013-03-02
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Network Working Group                                         J. Halpern
Request for Comments: 1223                                           NSC
                                                                May 1991

      OSI CLNS and LLC1 Protocols on Network Systems HYPERchannel

Status of this Memo

   The intent of this document is to provide a complete discussion of
   the protocols and techniques used to transmit OSI CLNS and LLC1
   datagrams (and any associated higher level protocols) on Network
   Systems Corporation's HYPERchannel equipment.  This document is
   intended for network planners and implementers who are already
   familiar with the OSI protocol suite and the techniques used to carry
   OSI traffic on standard networks such as 802.3.

   This memo provides information for the Internet community.  It does
   not specify an Internet standard.  Distribution of this memo is
   unlimited.

Table of Contents

     Goals of this Document   . . . . . . . . . . . . . . . . . . . . . 1
     HYPERchannel Network Messages  . . . . . . . . . . . . . . . . . . 2
       Message Proper Header  . . . . . . . . . . . . . . . . . . . . . 3
       TO Addresses and Open Driver Architecture  . . . . . . . . . . . 8
     Broadcasting   . . . . . . . . . . . . . . . . . . . . . . . . . . 9
       ES-IS  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
       IS-IS  . . . . . . . . . . . . . . . . . . . . . . . . . . . .  11
     References   . . . . . . . . . . . . . . . . . . . . . . . . . .  12
     Security Considerations  . . . . . . . . . . . . . . . . . . . .  12
     Author's Address . . . . . . . . . . . . . . . . . . . . . . . .  12

Goals of this Document

   In this document, we have three major technical objectives:

   1.  To standardize the encapsulation of LLC1 packets over
       HYPERchannel.  The format will be used for OSI CLNS and for
       any other protocols using LLC1 over HYPERchannel.  (Note
       that if one desires to use the LLC1/SNAP combination for
       TCP/IP, this is the format to use.  This represents an
       alternative to the native mode for TCP/IP over HYPERchannel,
       allowing for sharing the medium at the LLC1 layer.)

Halpern                                                         [Page 1]
RFC 1223              OSI and LLC1 on HYPERchannel              May 1991

   2.  To describe how multicast protocols such as ES-IS and IS-IS shall
       operate over HYPERchannel.  As a medium, HYPERchannel does not
       support either broadcast or multicast.  Therefore, special
       techniques are needed to handle these protocols.  Note that these
       techniques do not allow general multicast, although any specific
       problem may be solved by a generalization of these methods.

   3.  To make use of a standardized "message type" field in bytes
       8 and 9 of the HYPERchannel network message.  To permit better
       interoperability, NSC maintains a "network protocol registry"
       where any interested party may obtain a unique value in byte 8
       (or bytes 8 and 9) for their own public, private, commercial or
       proprietary protocol.  Lists of assigned protocol type numbers
       and their "owners" would be periodically published by NSC and
       are available to interested parties.

HYPERchannel Network Messages

   Unlike most datagram delivery systems, the HYPERchannel network
   message consists of two parts:

           Message Proper
          +--------------------+
          |                    |
          |                    |
          |                    |
          |     16-64 bytes    |
          |                    |
          |                    |
          |                    |
          +--------------------+

           Associated Data
          +----------------------------------------------------+
          |                                                    |
          |                                                    |
          |                                                    |
          |                                                    |
          |                                                    |
          |                                                    |
          |           Unlimited length                         |
          |                                                    |
          |                                                    |
          |                                                    |
          |                                                    |
          |                                                    |
          |                                                    |
          +----------------------------------------------------+

Halpern                                                         [Page 2]
RFC 1223              OSI and LLC1 on HYPERchannel              May 1991

   The first part is a message header that can be up to 64 bytes in
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