Resource ReSerVation Protocol (RSVP) -- Version 1 Functional Specification
RFC 2205

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Network Working Group                                   R. Braden, Ed.
Request for Comments: 2205                                         ISI
Category: Standards Track                                     L. Zhang
                                                                  UCLA
                                                             S. Berson
                                                                   ISI
                                                             S. Herzog
                                                          IBM Research
                                                              S. Jamin
                                                     Univ. of Michigan
                                                        September 1997

                Resource ReSerVation Protocol (RSVP) --

                   Version 1 Functional Specification

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

   This memo describes version 1 of RSVP, a resource reservation setup
   protocol designed for an integrated services Internet.  RSVP provides
   receiver-initiated setup of resource reservations for multicast or
   unicast data flows, with good scaling and robustness properties.

Braden, Ed., et. al.        Standards Track                     [Page 1]
RFC 2205                          RSVP                    September 1997

Table of Contents

   1. Introduction ................................................... 4
      1.1 Data Flows ................................................. 7
      1.2 Reservation Model .......................................... 8
      1.3 Reservation Styles .........................................11
      1.4 Examples of Styles .........................................14
   2. RSVP Protocol Mechanisms .......................................19
      2.1 RSVP Messages ..............................................19
      2.2 Merging Flowspecs ..........................................21
      2.3 Soft State .................................................22
      2.4 Teardown ...................................................24
      2.5 Errors .....................................................25
      2.6 Confirmation ...............................................27
      2.7 Policy Control .............................................27
      2.8 Security ...................................................28
      2.9 Non-RSVP Clouds ............................................29
      2.10 Host Model ................................................30
   3. RSVP Functional Specification ..................................32
      3.1 RSVP Message Formats .......................................32
      3.2 Port Usage .................................................47
      3.3 Sending RSVP Messages ......................................48
      3.4 Avoiding RSVP Message Loops ................................50
      3.5 Blockade State .............................................54
      3.6 Local Repair ...............................................56
      3.7 Time Parameters ............................................57
      3.8 Traffic Policing and Non-Integrated Service Hops ...........58
      3.9 Multihomed Hosts ...........................................59
      3.10 Future Compatibility ......................................61
      3.11 RSVP Interfaces ...........................................63
   4. Acknowledgments ................................................76
   APPENDIX A. Object Definitions ....................................77
   APPENDIX B. Error Codes and Values ................................92
   APPENDIX C. UDP Encapsulation .....................................98
   APPENDIX D. Glossary .............................................102
   REFERENCES .......................................................111
   SECURITY CONSIDERATIONS ..........................................111
   AUTHORS' ADDRESSES ...............................................112

Braden, Ed., et. al.        Standards Track                     [Page 2]
RFC 2205                          RSVP                    September 1997

   What's Changed

   This revision contains the following very minor changes from the ID14
   version.

      o    For clarity, each message type is now defined separately in
           Section 3.1.

      o    We added more precise and complete rules for accepting Path
           messages for unicast and multicast destinations (Section
           3.1.3).

      o    We added more precise and complete rules for processing and
           forwarding PathTear messages (Section 3.1.5).