RFC 2745 (rfc2745) - Page 1 of 23

RSVP Diagnostic Messages

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Network Working Group                                          A. Terzis
Request for Comments: 2745                                          UCLA
Category: Standards Track                                      B. Braden
                                                              S. Vincent
                                                           Cisco Systems
                                                                L. Zhang
                                                            January 2000

                        RSVP Diagnostic Messages

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.

Copyright Notice

   Copyright (C) The Internet Society (2000).  All Rights Reserved.


   This document specifies the RSVP diagnostic facility, which allows a
   user to collect information about the RSVP state along a path.  This
   specification describes the functionality, diagnostic message
   formats, and processing rules.

1.  Introduction

   In the basic RSVP protocol [RSVP], error messages are the only means
   for an end host to receive feedback regarding a failure in setting up
   either path state or reservation state.  An error message carries
   back only the information from the failed point, without any
   information about the state at other hops before or after the
   failure.  In the absence of failures, a host receives no feedback
   regarding the details of a reservation that has been put in place,
   such as whether, or where, or how, its own reservation request is
   being merged with that of others.  Such missing information can be
   highly desirable for debugging purposes, or for network resource
   management in general.

Terzis, et al.              Standards Track

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