Internet Stream Protocol Version 2 (ST2) Protocol Specification - Version ST2+
RFC 1819

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Network Working Group                                  ST2 Working Group
Request for Comments: 1819           L. Delgrossi and L. Berger, Editors
Obsoletes: 1190, IEN 119                                     August 1995
Category: Experimental

                Internet Stream Protocol Version 2 (ST2)
                 Protocol Specification - Version ST2+

Status of this Memo

   This memo defines an Experimental Protocol for the Internet
   community.  This memo does not specify an Internet standard of any
   kind.  Discussion and suggestions for improvement are requested.
   Distribution of this memo is unlimited.

IESG NOTE

   This document is a revision of RFC1190. The charter of this effort
   was clarifying, simplifying and removing errors from RFC1190 to
   ensure interoperability of implementations.

   NOTE WELL: Neither the version of the protocol described in this
   document nor the previous version is an Internet Standard or under
   consideration for that status.

   Since the publication of the original version of the protocol, there
   have been significant developments in the state of the art.  Readers
   should note that standards and technology addressing alternative
   approaches to the resource reservation problem are currently under
   development within the IETF.

Abstract

   This memo contains a revised specification of the Internet STream
   Protocol Version 2 (ST2). ST2 is an experimental resource reservation
   protocol intended to provide end-to-end real-time guarantees over an
   internet. It allows applications to build multi-destination simplex
   data streams with a desired quality of service. The revised version
   of ST2 specified in this memo is called ST2+.

   This specification is a product of the STream Protocol Working Group
   of the Internet Engineering Task Force.

Delgrossi & Berger, Editors   Experimental                      [Page 1]
RFC 1819              ST2+ Protocol Specification            August 1995

Table of Contents

     1  Introduction                                                   6
             1.1  What is ST2?                                         6
             1.2  ST2 and IP                                           8
             1.3  Protocol History                                     8
             1.3.1  RFC1190 ST and ST2+ Major Differences              9
             1.4  Supporting Modules for ST2                          10
             1.4.1  Data Transfer Protocol                            11
             1.4.2  Setup Protocol                                    11
             1.4.3  Flow Specification                                11
             1.4.4  Routing Function                                  12
             1.4.5  Local Resource Manager                            12
             1.5  ST2 Basic Concepts                                  15
             1.5.1  Streams                                           16
             1.5.2  Data Transmission                                 16
             1.5.3  Flow Specification                                17
             1.6  Outline of This Document                            19

     2  ST2 User Service Description                                  19
             2.1  Stream Operations and Primitive Functions           19
             2.2  State Diagrams                                      21
             2.3  State Transition Tables                             25

     3  The ST2 Data Transfer Protocol                                26
             3.1  Data Transfer with ST                               26
             3.2  ST Protocol Functions                               27
             3.2.1  Stream Identification                             27
             3.2.2  Packet Discarding based on Data Priority          27

     4  SCMP Functional Description                                   28
             4.1  Types of Streams                                    29
             4.1.1  Stream Building                                   30
             4.1.2  Knowledge of Receivers                            30
             4.2  Control PDUs                                        31
             4.3  SCMP Reliability                                    32
             4.4  Stream Options                                      33
             4.4.1  No Recovery                                       33
             4.4.2  Join Authorization Level                          34
             4.4.3  Record Route                                      34
             4.4.4  User Data                                         35
             4.5  Stream Setup                                        35
             4.5.1  Information from the Application                  35
             4.5.2  Initial Setup at the Origin                       35
             4.5.2.1  Invoking the Routing Function                   36
             4.5.2.2  Reserving Resources                             36