Protocol Extensions for Support of Diffserv-aware MPLS Traffic Engineering
RFC 4124

• Status
• IESG evaluation record
• IESG writeups
• Email expansions
• History

• Versions
• 08

Network Working Group                                F. Le Faucheur, Ed.
Request for Comments: 4124                           Cisco Systems, Inc.
Category: Standards Track                                      June 2005

                  Protocol Extensions for Support of
                Diffserv-aware MPLS Traffic Engineering

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 (2005).

Abstract

   This document specifies the protocol extensions for support of
   Diffserv-aware MPLS Traffic Engineering (DS-TE).  This includes
   generalization of the semantics of a number of Interior Gateway
   Protocol (IGP) extensions already defined for existing MPLS Traffic
   Engineering in RFC 3630, RFC 3784, and additional IGP extensions
   beyond those.  This also includes extensions to RSVP-TE signaling
   beyond those already specified in RFC 3209 for existing MPLS Traffic
   Engineering.  These extensions address the requirements for DS-TE
   spelled out in RFC 3564.

Table of Contents

   1. Introduction ....................................................3
      1.1. Specification of Requirements ..............................3
   2. Contributing Authors ............................................4
   3. Definitions .....................................................5
   4. Configurable Parameters .........................................5
      4.1. Link Parameters ............................................5
           4.1.1. Bandwidth Constraints (BCs) .........................5
           4.1.2. Overbooking .........................................6
      4.2. LSR Parameters .............................................7
           4.2.1. TE-Class Mapping ....................................7
      4.3. LSP Parameters .............................................8
           4.3.1. Class-Type ..........................................8
           4.3.2. Setup and Holding Preemption Priorities .............8
           4.3.3. Class-Type/Preemption Relationship ..................8

Le Faucheur                 Standards Track                     [Page 1]
RFC 4124            Protocols for Diffserv-aware TE            June 2005

      4.4. Examples of Parameters Configuration .......................9
           4.4.1. Example 1 ...........................................9
           4.4.2. Example 2 ...........................................9
           4.4.3. Example 3 ..........................................10
           4.4.4. Example 4 ..........................................11
           4.4.5. Example 5 ..........................................11
   5. IGP Extensions for DS-TE .......................................12
      5.1. Bandwidth Constraints .....................................12
      5.2. Unreserved Bandwidth ......................................14
   6. RSVP-TE Extensions for DS-TE ...................................15
      6.1. DS-TE-Related RSVP Messages Format ........................15
           6.1.1. Path Message Format ................................16
      6.2. CLASSTYPE Object ..........................................16
           6.2.1. CLASSTYPE object ...................................16
      6.3. Handling CLASSTYPE Object .................................17
      6.4. Non-support of the CLASSTYPE Object .......................20
      6.5. Error Codes for Diffserv-aware TE .........................20
   7. DS-TE Support with MPLS Extensions .............................21
      7.1. DS-TE Support and References to Preemption Priority .......22
      7.2. DS-TE Support and References to Maximum Reservable
           Bandwidth .................................................22
   8. Constraint-Based Routing .......................................22
   9. Diffserv Scheduling ............................................23
   10. Existing TE as a Particular Case of DS-TE .....................23
   11. Computing "Unreserved TE-Class [i]" and Admission
       Control Rules .................................................23
       11.1. Computing "Unreserved TE-Class [i]" .....................23
       11.2. Admission Control Rules .................................24
   12. Security Considerations .......................................24
   13. IANA Considerations ...........................................25
       13.1. A New Name Space for Bandwidth Constraints Model
             Identifiers .............................................25
       13.2. A New Name Space for Error Values under the
             "Diffserv-aware TE ......................................25
       13.3. Assignments Made in This Document .......................26