RFC 1561 (rfc1561) - Page 2 of 25

Use of ISO CLNP in TUBA Environments

RFC 1561               CLNP in TUBA Environments           December 1993


Conventions

   The following language conventions are used in the items of
   specification in this document:

         * MUST, SHALL, or MANDATORY -- the item is an absolute
           requirement of the specification.

         * SHOULD or RECOMMENDED -- the item should generally be
           followed for all but exceptional circumstances.

         * MAY or OPTIONAL -- the item is truly optional and may be
           followed or ignored according to the needs of the
           implementor.

1.  Terminology

   To the extent possible, this document is written in the language of
   the Internet. For example, packet is used rather than "protocol data
   unit", and "fragment" is used rather than "segment".  There are some
   terms that carry over from OSI; these are, for the most part, used so
   that cross-reference between this document and RFC 994 [6] or ISO/IEC
   8473 is not entirely painful.  OSI acronyms are for the most part
   avoided.

2.  Introduction

   The goal of this specification is to allow compatible and
   interoperable implementations to encapsulate TCP and UDP packets in
   CLNP data units. In a sense, it is more of a "hosts requirements"
   document for the network layer of TUBA implementations than a
   protocol specification. It is assumed that readers are familiar with
   STD 5, RFC 791, STD 5, RFC 792 [7], STD 3, RFC 1122 [8], and, to a
   lesser extent, RFC 994 and ISO/IEC 8473.  This document is compatible
   with (although more restrictive than) ISO/IEC 8473; specifically, the
   order, semantics, and processing of CLNP header fields is consistent
   between this and ISO/IEC 8473.

   [Note: RFC 994 contains the Draft International Standard version of
   ISO CLNP, in ASCII text. This is not the final version of the ISO/IEC
   protocol specification; however, it should provide sufficient
   background for the purpose of understanding the relationship of CLNP
   to IP, and the means whereby IP information is to be encoded in CLNP
   header fields. Postscript versions of ISO CLNP and associated routing
   protocols are available via anonymous FTP from merit.edu, and may be
   found in the directory /pub/ISO/IEC.





Piscitello