Diffserv-Aware Class-Type Object for the Path Computation Element Communication Protocol
RFC 5455

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Network Working Group                                  S. Sivabalan, Ed.
Request for Comments: 5455                                     J. Parker
Category: Standards Track                                     S. Boutros
                                                     Cisco Systems, Inc.
                                                               K. Kumaki
                                             KDDI R&D Laboratories, Inc.
                                                              March 2009

                 Diffserv-Aware Class-Type Object for
          the Path Computation Element Communication Protocol

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.

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Abstract

   This document specifies a CLASSTYPE object to support Diffserv-Aware
   Traffic Engineering (DS-TE) where path computation is performed with
   the aid of a Path Computation Element (PCE).

Sivabalan, et al.           Standards Track                     [Page 1]
RFC 5455              DS Aware CT Object for PCEP             March 2009

Table of Contents

   1. Introduction ....................................................2
      1.1. Conventions Used in This Document ..........................3
   2. Terminology .....................................................3
   3. CLASSTYPE Object ................................................3
      3.1. Object Definition ..........................................4
      3.2. Path Computation Request Message with CLASSTYPE Object .....4
      3.3. Processing CLASSTYPE Object ................................5
      3.4. Determination of Traffic Engineering Class (TE-Class) ......6
      3.5. Significance of Class-Type and TE-Class ....................6
      3.6. Error Codes for CLASSTYPE Object ...........................6
   4. Security Considerations .........................................7
   5. IANA Considerations .............................................7
   6. Acknowledgments .................................................7
   7. References ......................................................8
      7.1. Normative References .......................................8
      7.2. Informative References .....................................8

1.  Introduction

   [RFC5440] specifies the Path Computation Element Communication
   Protocol (PCEP) for communications between a Path Computation Client
   (PCC) and a Path Computation Element (PCE), or between two PCEs, in
   compliance with [RFC4657].

   Diffserv-aware MPLS Traffic Engineering (DS-TE) addresses the
   fundamental requirement to be able to enforce different bandwidth
   constraints for different classes of traffic.  It describes
   mechanisms to achieve per-class traffic engineering, rather than on
   an aggregate basis across all classes by enforcing Bandwidth
   Constraints (BCs) on different classes.  Requirements for DS-TE and
   the associated protocol extensions are specified in [RFC3564] and
   [RFC4124], respectively.

   As per [RFC4657], PCEP must support traffic Class-Type as an MPLS-
   TE-specific constraint.  However, in the present form, PCEP [RFC5440]
   does not have the capability to specify the Class-Type in the path
   computation request.

   In this document, we define a new PCEP object called CLASSTYPE, which
   carries the Class-Type of the TE LSP in the path computation request.
   During path computation, a PCE uses the Class-Type to identify the
   bandwidth constraint of the TE LSP.

Sivabalan, et al.           Standards Track                     [Page 2]