COPS usage for RSVP
RFC 2749

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Network Working Group                                    S . Herzog, Ed.
Request for Comments: 2749                                     IPHighway
Category: Standards Track                                       J. Boyle
                                                                  Level3
                                                                R. Cohen
                                                                   Cisco
                                                               D. Durham
                                                                   Intel
                                                                R. Rajan
                                                                    AT&T
                                                               A. Sastry
                                                                   Cisco
                                                            January 2000

                          COPS usage for RSVP

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.

Abstract

   This document describes usage directives for supporting COPS policy
   services in RSVP environments.

Table of Contents

   1 Introduction....................................................2
   2 RSVP values for COPS objects....................................2
   2.1  Common Header, client-type...................................2
   2.2  Context Object (Context).....................................3
   2.3  Client Specific Information (ClientSI).......................4
   2.4  Decision Object (Decision)...................................4
   3 Operation of COPS for RSVP PEPs.................................6
   3.1  RSVP flows...................................................6
   3.2  Expected Associations for RSVP Requests......................6
   3.3  RSVP's Capacity Admission Control: Commit and Delete.........7
   3.4  Policy Control Over PathTear and ResvTear....................7

Herzog, et al.              Standards Track                     [Page 1]
RFC 2749                  COPS usage for RSVP               January 2000

   3.5  PEP Caching COPS Decisions...................................7
   3.6  Using Multiple Context Flags in a single query...............8
   3.7  RSVP Error Reporting.........................................9
   4 Security Considerations.........................................9
   5 Illustrative Examples, Using COPS for RSVP......................9
   5.1  Unicast Flow Example.........................................9
   5.2  Shared Multicast Flows......................................11
   6 References.....................................................14
   7 Author Information and Acknowledgments.........................15
   8 Full Copyright Statement.......................................17

1  Introduction

   The Common Open Policy Service (COPS) protocol is a query response
   protocol used to exchange policy information between a network policy
   server and a set of clients [COPS]. COPS is being developed within
   the RSVP Admission Policy Working Group (RAP WG) of the IETF,
   primarily for use as a mechanism for providing policy-based admission
   control over requests for network resources [RAP].

   This document is based on and assumes prior knowledge of the RAP
   framework [RAP] and the basic COPS [COPS] protocol. It provides
   specific usage directives for using COPS in outsourcing policy
   control decisions by RSVP clients (PEPs) to policy servers (PDPs).

   Given the COPS protocol design, RSVP directives are mainly limited to
   RSVP applicability, interoperability and usage guidelines, as well as
   client specific examples.

2  RSVP values for COPS objects

   The usage of several COPS objects is affected when used with the RSVP
   client type. This section describes these objects and their usage.

2.1 Common Header, client-type

   RSVP is COPS client-type 1

Herzog, et al.              Standards Track                     [Page 2]
RFC 2749                  COPS usage for RSVP               January 2000

2.2 Context Object (Context)

   The semantics of the Context object for RSVP is as follows:

   R-Type (Request Type Flag)

   Incoming-Message request

         This context is used when the PEP receives an incoming RSVP
         message. The PDP may decide to accept or reject the incoming
         message and may also apply other decision objects to it. If the
         incoming message is rejected, RSVP should treat it as if it
         never arrived.

   Resource-Allocation request