Analysis of Existing Quality-of-Service Signaling Protocols
RFC 4094

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Network Working Group                                          J. Manner
Request for Comments: 4094                                         X. Fu
Category: Informational                                         May 2005

      Analysis of Existing Quality-of-Service Signaling Protocols

Status of This Memo

   This memo provides information for the Internet community.  It does
   not specify an Internet standard of any kind.  Distribution of this
   memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2005).

Abstract

   This document reviews some of the existing Quality of Service (QoS)
   signaling protocols for an IP network.  The goal here is to learn
   from them and to avoid common misconceptions.  Further, we need to
   avoid mistakes during the design and implementation of any new
   protocol in this area.

Table of Contents

   1. Introduction ....................................................3
   2. RSVP and RSVP Extensions ........................................4
      2.1. Basic Design ...............................................4
           2.1.1. Signaling Model .....................................4
           2.1.2. Soft State ..........................................5
           2.1.3. Two-Pass Signaling Message Exchanges ................5
           2.1.4. Receiver-Based Resource Reservation .................5
           2.1.5. Separation of QoS Signaling from Routing ............5
      2.2. RSVP Extensions ............................................6
           2.2.1. Simple Tunneling ....................................6
           2.2.2. IPsec Interface .....................................6
           2.2.3. Policy Interface ....................................6
           2.2.4. Refresh Reduction ...................................7
           2.2.5. RSVP over RSVP ......................................8
           2.2.6. IEEE 802-Style LAN Interface ........................8
           2.2.7. ATM Interface .......................................9
           2.2.8. DiffServ Interface ..................................9
           2.2.9. Null Service Type ...................................9
           2.2.10. MPLS Traffic Engineering ..........................10
           2.2.11. GMPLS and RSVP-TE .................................11

Manner & Fu                  Informational                      [Page 1]
RFC 4094               Analysis of QoS Signaling                May 2005

           2.2.12. GMPLS Operation at UNI and E-NNI Reference
                   Points ............................................12
           2.2.13. MPLS and GMPLS Future Extensions ..................12
           2.2.14. ITU-T H.323 Interface .............................13
           2.2.15. 3GPP Interface ....................................13
      2.3. Extensions for New Deployment Scenarios ...................14
      2.4. Conclusion ................................................15
   3. RSVP Transport Mechanism Issues ................................16
      3.1. Messaging Reliability .....................................16
      3.2. Message Packing ...........................................17
      3.3. MTU Problem ...............................................17
      3.4. RSVP-TE vs. Signaling Protocol for RT Applications ........18
      3.5. What Would Be a Better Alternative? .......................18
   4. RSVP Protocol Performance Issues ...............................19
      4.1. Processing Overhead .......................................19
      4.2. Bandwidth Consumption .....................................20
   5. RSVP Security and Mobility .....................................21
      5.1. Security ..................................................21
      5.2. Mobility Support ..........................................22
   6. Other QoS Signaling Proposals ..................................23
      6.1. Tenet and ST-II ...........................................23
      6.2. YESSIR ....................................................24
           6.2.1. Reservation Functionality ..........................24
           6.2.2. Conclusion .........................................25
      6.3. Boomerang .................................................25
           6.3.1. Reservation Functionality ..........................25
           6.3.2. Conclusions ........................................26
      6.4. INSIGNIA ..................................................26
   7. Inter-Domain Signaling .........................................27
      7.1. BGRP ......................................................27
      7.2. SICAP .....................................................27
      7.3. DARIS .....................................................28
   8. Security Considerations ........................................30
   9. Summary ........................................................30
   10. Contributors ..................................................31