Update to Include Route Object (IRO) specification in Path Computation Element communication Protocol (PCEP)
draft-ietf-pce-iro-update-03

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Last updated 2015-11-16
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PCE Working Group                                               D. Dhody
Internet-Draft                                       Huawei Technologies
Updates: 5440 (if approved)                            November 16, 2015
Intended status: Standards Track
Expires: May 19, 2016

 Update to Include Route Object (IRO) specification in Path Computation
                 Element communication Protocol (PCEP)
                      draft-ietf-pce-iro-update-03

Abstract

   During discussions of a document to provide a standard representation
   and encoding of Domain-Sequence within the Path Computation Element
   (PCE) communication Protocol (PCEP) for communications between a Path
   Computation Client (PCC) and a PCE, or between two PCEs, it was
   determined that there was a need for clarification with respect to
   the ordered nature of the Include Route Object (IRO).

   An informal survey was conducted to determine the state of current
   and planned implementation with respect to IRO ordering and handling
   of Loose bit (L bit).

   This document updates the IRO specification of RFC 5440 based on the
   survey conclusion and recommendation.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on May 19, 2016.

Dhody                     Expires May 19, 2016                  [Page 1]
Internet-Draft                 IRO-UPDATE                  November 2015

Copyright Notice

   Copyright (c) 2015 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   3
   2.  Update in IRO specification . . . . . . . . . . . . . . . . .   3
   3.  Other Considerations  . . . . . . . . . . . . . . . . . . . .   4
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
   6.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   4
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   4
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .   4
     7.2.  Informative References  . . . . . . . . . . . . . . . . .   5
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   The Path Computation Element Communication Protocol (PCEP) provides
   mechanisms for Path Computation Elements (PCEs) to perform path
   computations in response to Path Computation Clients (PCCs) requests.

   [RFC5440] defines the Include Route Object (IRO) to specify network
   elements to be traversed in the computed path.  The specification did
   not mention if IRO is an ordered or un-ordered list of sub-objects.
   It mentioned that the Loose bit (L bit) has no meaning within an IRO.

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

   In order to discover the current state of affairs amongst
   implementations a survey of the existing and planned implementations
   was conducted.  This survey [I-D.dhody-pce-iro-survey] was informal
   and conducted via email.  Responses were collected and anonymized by
   the PCE working group chair.

Dhody                     Expires May 19, 2016                  [Page 2]
Internet-Draft                 IRO-UPDATE                  November 2015

   During discussion of [I-D.ietf-pce-pcep-domain-sequence] it was
   proposed to have a new IRO type with ordered nature, as well as
   handling of Loose bit (L bit); however, with the update to [RFC5440]
   described in this document, no new IRO type is needed.

   This document updates the IRO specifications in section 7.12 of
   [RFC5440] as per the conclusion and action points presented in
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