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Requirements for GMPLS Applications of PCE
RFC 7025

Internet Engineering Task Force (IETF)                          T. Otani
Request for Comments: 7025                                      K. Ogaki
Category: Informational                                             KDDI
ISSN: 2070-1721                                              D. Caviglia
                                                                Ericsson
                                                                F. Zhang
                                                     Huawei Technologies
                                                             C. Margaria
                                                        Coriant R&D GmbH
                                                          September 2013

               Requirements for GMPLS Applications of PCE

Abstract

   The initial effort of the PCE (Path Computation Element) WG focused
   mainly on MPLS.  As a next step, this document describes functional
   requirements for GMPLS applications of PCE.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   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).  Not all documents
   approved by the IESG are a candidate for any level of Internet
   Standard; see Section 2 of RFC 5741.

   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/rfc7025.

Otani, et al.                 Informational                     [Page 1]
RFC 7025               Reqs for GMPLS Apps of PCE         September 2013

Copyright Notice

   Copyright (c) 2013 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
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  2
   2.  GMPLS Applications of PCE  . . . . . . . . . . . . . . . . . .  3
     2.1.  Path Computation in GMPLS Networks . . . . . . . . . . . .  3
     2.2.  Unnumbered Interface . . . . . . . . . . . . . . . . . . .  5
     2.3.  Asymmetric Bandwidth Path Computation  . . . . . . . . . .  5
   3.  Requirements for GMPLS Applications of PCE . . . . . . . . . .  6
     3.1.  Requirements on Path Computation Request . . . . . . . . .  6
     3.2.  Requirements on Path Computation Reply . . . . . . . . . .  7
     3.3.  GMPLS PCE Management . . . . . . . . . . . . . . . . . . .  8
   4.  Security Considerations  . . . . . . . . . . . . . . . . . . .  8
   5.  Acknowledgement  . . . . . . . . . . . . . . . . . . . . . . .  9
   6.  References . . . . . . . . . . . . . . . . . . . . . . . . . .  9
     6.1.  Normative References . . . . . . . . . . . . . . . . . . .  9
     6.2.  Informative References . . . . . . . . . . . . . . . . . . 11

1.  Introduction

   The initial effort of the PCE (Path Computation Element) WG focused
   mainly on solving the path computation problem within a domain or
   over different domains in MPLS networks.  As with MPLS, service
   providers (SPs) have also come up with requirements for path
   computation in GMPLS-controlled networks [RFC3945], such as those
   based on Wavelength Division Multiplexing (WDM), Time Division
   Multiplexing (TDM), or Ethernet.

   [RFC4655] and [RFC4657] discuss the framework and requirements for
   PCE on both packet MPLS networks and GMPLS-controlled networks.  This
   document complements those RFCs by providing considerations of GMPLS
   applications in the intradomain and interdomain networking
   environments and indicating a set of requirements for the extended
   definition of PCE-related protocols.

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RFC 7025               Reqs for GMPLS Apps of PCE         September 2013

   Note that the requirements for interlayer and inter-area traffic
   engineering (TE) described in [RFC6457] and [RFC4927] are outside of
   the scope of this document.

   Constrained Shortest Path First (CSPF) computation within a domain or

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