Update to the Include Route Object (IRO) Specification in the Path Computation Element Communication Protocol (PCEP)
RFC 7896

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Internet Engineering Task Force (IETF)                          D. Dhody
Request for Comments: 7896                           Huawei Technologies
Updates: 5440                                                  June 2016
Category: Standards Track
ISSN: 2070-1721

         Update to the Include Route Object (IRO) Specification
     in the Path Computation Element Communication Protocol (PCEP)

Abstract

   The Path Computation Element Communication Protocol (PCEP) enables
   communications between a Path Computation Client (PCC) and a PCE, or
   between two PCEs.  RFC 5440 defines the Include Route Object (IRO) to
   specify network elements to be traversed in the computed path.  The
   specification does not specify if the IRO contains an ordered or
   unordered list of subobjects.  During recent discussions, it was
   determined that there was a need to define a standard representation
   to ensure interoperability.  It was also noted that there is a
   benefit in the handling of an attribute of the IRO's subobject, the L
   bit.

   This document updates RFC 5440 regarding the IRO specification.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc7896.

Dhody                        Standards Track                    [Page 1]
RFC 7896                IRO Specification Update               June 2016

Copyright Notice

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Update in the IRO Specification . . . . . . . . . . . . . . .   3
     2.1.  Update to RFC 5440  . . . . . . . . . . . . . . . . . . .   3
   3.  Operational Considerations  . . . . . . . . . . . . . . . . .   4
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   5.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   4
     5.1.  Normative References  . . . . . . . . . . . . . . . . . .   4
     5.2.  Informative References  . . . . . . . . . . . . . . . . .   5
   Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . .   5
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   5

Dhody                        Standards Track                    [Page 2]
RFC 7896                IRO Specification Update               June 2016

1.  Introduction

   The Path Computation Element Communication Protocol (PCEP) enables
   communications between a Path Computation Client (PCC) and a PCE, or
   between two PCEs.  [RFC5440] defines the Include Route Object (IRO)
   to specify network elements to be traversed in the computed path.
   The specification does not specify if the IRO is an ordered or
   unordered list of subobjects.  In addition, it defines the L bit as
   having no meaning within an IRO.

   [RFC5441] describes the use of an IRO to indicate the sequence of
   domains to be traversed during inter-domain path computation.

   During recent discussions, it was determined that there was a need to
   define a standard representation to ensure interoperability.

   This document updates the IRO specifications in Section 7.12 of