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General Internet Signaling Transport (GIST) State Machine
RFC 5972

Internet Engineering Task Force (IETF)                         T. Tsenov
Request for Comments: 5972                                 H. Tschofenig
Category: Informational                            Nokia Siemens Network
ISSN: 2070-1721                                               X. Fu, Ed.
                                                        Univ. Goettingen
                                                                 C. Aoun
                                                              Consultant
                                                               E. Davies
                                                        Folly Consulting
                                                            October 2010

       General Internet Signaling Transport (GIST) State Machine

Abstract

   This document describes state machines for the General Internet
   Signaling Transport (GIST).  The states of GIST nodes for a given
   flow and their transitions are presented in order to illustrate how
   GIST may be implemented.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Not all documents
   approved by the IESG are a candidate for any level of Internet
   Standard; see Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc5972.

Copyright Notice

   Copyright (c) 2010 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must

Tsenov, et al.                Informational                     [Page 1]
RFC 5972                   GIST State Machine               October 2010

   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

   This document may contain material from IETF Documents or IETF
   Contributions published or made publicly available before November
   10, 2008.  The person(s) controlling the copyright in some of this
   material may not have granted the IETF Trust the right to allow
   modifications of such material outside the IETF Standards Process.
   Without obtaining an adequate license from the person(s) controlling
   the copyright in such materials, this document may not be modified
   outside the IETF Standards Process, and derivative works of it may
   not be created outside the IETF Standards Process, except to format
   it for publication as an RFC or to translate it into languages other
   than English.

Table of Contents

   1. Introduction ....................................................3
   2. Terminology .....................................................3
   3. Notational Conventions Used in State Diagrams ...................3
   4. State Machine Symbols ...........................................5
   5. Common Rules ....................................................6
      5.1. Common Procedures ..........................................7
      5.2. Common Events ..............................................8
      5.3. Common Variables ...........................................9
   6. State Machines .................................................11
      6.1. Diagram Notations .........................................12
      6.2. State Machine for GIST Querying Node ......................12
      6.3. State Machine for GIST Responding Node ....................16
   7. Security Considerations ........................................18
   8. Acknowledgments ................................................18
   9. References .....................................................18
      9.1. Normative References ......................................18
      9.2. Informative References ....................................18
   Appendix A. State Transition Tables ...............................20
      A.1. State Transition Tables for GIST Querying Node ............20
      A.2. State Transition Tables for GIST Responding Node ..........24

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