Extensions to the Path Computation Element Communication Protocol (PCEP) for Inter-Layer MPLS and GMPLS Traffic Engineering
RFC 8282

Document Type RFC - Proposed Standard (December 2017; No errata)
Last updated 2017-12-21
Replaces draft-oki-pce-inter-layer-ext
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Internet Engineering Task Force (IETF)                            E. Oki
Request for Comments: 8282                              Kyoto University
Category: Standards Track                                      T. Takeda
ISSN: 2070-1721                                                      NTT
                                                               A. Farrel
                                                        Juniper Networks
                                                                F. Zhang
                                           Huawei Technologies Co., Ltd.
                                                           December 2017

Extensions to the Path Computation Element Communication Protocol (PCEP)
           for Inter-Layer MPLS and GMPLS Traffic Engineering

Abstract

   The Path Computation Element (PCE) provides path computation
   functions in support of traffic engineering in Multiprotocol Label
   Switching (MPLS) and Generalized MPLS (GMPLS) networks.

   MPLS and GMPLS networks may be constructed from layered service
   networks.  It is advantageous for overall network efficiency to
   provide end-to-end traffic engineering across multiple network layers
   through a process called inter-layer traffic engineering.  PCE is a
   candidate solution for such requirements.

   The PCE Communication Protocol (PCEP) is designed as a communication
   protocol between Path Computation Clients (PCCs) and PCEs.  This
   document presents PCEP extensions for inter-layer traffic
   engineering.

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
   https://www.rfc-editor.org/info/rfc8282.

Oki, et al.                  Standards Track                    [Page 1]
RFC 8282                    Inter-Layer PCEP               December 2017

Copyright Notice

   Copyright (c) 2017 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
   (https://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  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   4
   2.  Overview of PCE-Based Inter-Layer Path Computation  . . . . .   4
   3.  Protocol Extensions . . . . . . . . . . . . . . . . . . . . .   4
     3.1.  INTER-LAYER Object  . . . . . . . . . . . . . . . . . . .   5
     3.2.  SWITCH-LAYER Object . . . . . . . . . . . . . . . . . . .   8
     3.3.  REQ-ADAP-CAP Object . . . . . . . . . . . . . . . . . . .   9
     3.4.  New Metric Types  . . . . . . . . . . . . . . . . . . . .  10
     3.5.  SERVER-INDICATION Object  . . . . . . . . . . . . . . . .  11
   4.  Procedures  . . . . . . . . . . . . . . . . . . . . . . . . .  11
     4.1.  Path Computation Request  . . . . . . . . . . . . . . . .  11
     4.2.  Path Computation Reply  . . . . . . . . . . . . . . . . .  12
     4.3.  Stateful PCE and PCE Initiated LSPs . . . . . . . . . . .  13
   5.  Updated Format of PCEP Messages . . . . . . . . . . . . . . .  14
   6.  Manageability Considerations  . . . . . . . . . . . . . . . .  15
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  16
     7.1.  New PCEP Objects  . . . . . . . . . . . . . . . . . . . .  16
     7.2.  New Registry for INTER-LAYER Object Flags . . . . . . . .  17
     7.3.  New Metric Types  . . . . . . . . . . . . . . . . . . . .  17
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .  18
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  18
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  18
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  19
   Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . .  21
   Contributors  . . . . . . . . . . . . . . . . . . . . . . . . . .  21
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  22

Oki, et al.                  Standards Track                    [Page 2]
RFC 8282                    Inter-Layer PCEP               December 2017
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