Aggregation of Resource ReSerVation Protocol (RSVP) Reservations over MPLS TE/DS-TE Tunnels
RFC 4804

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Network Working Group                                F. Le Faucheur, Ed.
Request for Comments: 4804                           Cisco Systems, Inc.
Category: Standards Track                                  February 2007

          Aggregation of Resource ReSerVation Protocol (RSVP)
                Reservations over MPLS TE/DS-TE Tunnels

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 IETF Trust (2007).

Abstract

   RFC 3175 specifies aggregation of Resource ReSerVation Protocol
   (RSVP) end-to-end reservations over aggregate RSVP reservations.
   This document specifies aggregation of RSVP end-to-end reservations
   over MPLS Traffic Engineering (TE) tunnels or MPLS Diffserv-aware
   MPLS Traffic Engineering (DS-TE) tunnels.  This approach is based on
   RFC 3175 and simply modifies the corresponding procedures for
   operations over MPLS TE tunnels instead of aggregate RSVP
   reservations.  This approach can be used to achieve admission control
   of a very large number of flows in a scalable manner since the
   devices in the core of the network are unaware of the end-to-end RSVP
   reservations and are only aware of the MPLS TE tunnels.

Faucheur                    Standards Track                     [Page 1]
RFC 4804         RSVP Aggregation over MPLS TE Tunnels     February 2007

Table of Contents

   1. Introduction ....................................................3
   2. Specification of Requirements ...................................7
   3. Definitions .....................................................7
   4. Operations of RSVP Aggregation over TE with
      Pre-established Tunnels .........................................8
      4.1. Reference Model ............................................9
      4.2. Receipt of E2E Path Message by the Aggregator ..............9
      4.3. Handling of E2E Path Message by Transit LSRs ..............11
      4.4. Receipt of E2E Path Message by the Deaggregator ...........11
      4.5. Handling of E2E Resv Message by the Deaggregator ..........12
      4.6. Handling of E2E Resv Message by the Aggregator ............12
      4.7. Forwarding of E2E Traffic by the Aggregator ...............14
      4.8. Removal of E2E Reservations ...............................14
      4.9. Removal of the TE Tunnel ..................................14
      4.10. Example Signaling Flow ...................................15
   5. IPv4 and IPv6 Applicability ....................................16
   6. E2E Reservations Applicability .................................16
   7. Example Deployment Scenarios ...................................16
      7.1. Voice and Video Reservations Scenario .....................16
      7.2. PSTN/3G Voice Trunking Scenario ...........................17
   8. Security Considerations ........................................18
   9. Acknowledgments ................................................20
   10. Normative References ..........................................20
   11. Informative References ........................................21
   Appendix A - Optional Use of RSVP Proxy on RSVP Aggregator ........23
   Appendix B - Example Usage of RSVP Aggregation over DSTE Tunnels
                for VoIP Call Admission Control (CAC) ................25

Faucheur                    Standards Track                     [Page 2]
RFC 4804         RSVP Aggregation over MPLS TE Tunnels     February 2007

1.  Introduction

   The Integrated Services (Intserv) [INT-SERV] architecture provides a
   means for the delivery of end-to-end Quality of Service (QoS) to
   applications over heterogeneous networks.

   [RSVP] defines the Resource reSerVation Protocol that can be used by
   applications to request resources from the network.  The network
   responds by explicitly admitting or rejecting these RSVP requests.
   Certain applications that have quantifiable resource requirements
   express these requirements using Intserv parameters as defined in the
   appropriate Intserv service specifications ([GUARANTEED],
   [CONTROLLED]).

   The Differentiated Services (DiffServ) architecture ([DIFFSERV]) was
   then developed to support the differentiated treatment of packets in
   very large scale environments.  In contrast to the per-flow
   orientation of Intserv and RSVP, Diffserv networks classify packets
   into one of a small number of aggregated flows or "classes", based on
   the Diffserv codepoint (DSCP) in the packet IP header.  At each
   Diffserv router, packets are subjected to a "per-hop behavior" (PHB),
   which is invoked by the DSCP.  The primary benefit of Diffserv is its