Framework for GMPLS and PCE Control of G.709 Optical Transport Networks
RFC 7062

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Internet Engineering Task Force (IETF)                     F. Zhang, Ed.
Request for Comments: 7062                                         D. Li
Category: Informational                                           Huawei
ISSN: 2070-1721                                                    H. Li
                                                                    CMCC
                                                              S. Belotti
                                                          Alcatel-Lucent
                                                           D. Ceccarelli
                                                                Ericsson
                                                           November 2013

                 Framework for GMPLS and PCE Control of
                    G.709 Optical Transport Networks

Abstract

   This document provides a framework to allow the development of
   protocol extensions to support Generalized Multi-Protocol Label
   Switching (GMPLS) and Path Computation Element (PCE) control of
   Optical Transport Networks (OTNs) as specified in ITU-T
   Recommendation G.709 as published in 2012.

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/rfc7062.

Zhang, et al.                 Informational                     [Page 1]
RFC 7062                      OTN Framework                November 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 ....................................................3
   2. Terminology .....................................................3
   3. G.709 Optical Transport Network .................................4
      3.1. OTN Layer Network ..........................................5
           3.1.1. Client Signal Mapping ...............................6
           3.1.2. Multiplexing ODUj onto Links ........................7
                  3.1.2.1. Structure of MSI Information ...............9
   4. Connection Management in OTN ...................................10
      4.1. Connection Management of the ODU ..........................11
   5. GMPLS/PCE Implications .........................................13
      5.1. Implications for Label Switched Path (LSP) Hierarchy ......13
      5.2. Implications for GMPLS Signaling ..........................14
      5.3. Implications for GMPLS Routing ............................16
      5.4. Implications for Link Management Protocol .................18
      5.5. Implications for Control-Plane Backward Compatibility .....19
      5.6. Implications for Path Computation Elements ................20
      5.7. Implications for Management of GMPLS Networks .............20
   6. Data-Plane Backward Compatibility Considerations ...............21
   7. Security Considerations ........................................21
   8. Acknowledgments ................................................22
   9. Contributors ...................................................22
   10. References ....................................................23
      10.1. Normative References .....................................23
      10.2. Informative References ...................................24

Zhang, et al.                 Informational                     [Page 2]
RFC 7062                      OTN Framework                November 2013

1.  Introduction

   Optical Transport Networks (OTNs) have become a mainstream layer 1
   technology for the transport network.  Operators want to introduce
   control-plane capabilities based on GMPLS to OTN to realize the
   benefits associated with a high-function control plane (e.g.,
   improved network resiliency, resource usage efficiency, etc.).

   GMPLS extends Multi-Protocol Label Switching (MPLS) to encompass Time