Framework and Requirements for GMPLS-Based Control of Flexi-Grid Dense Wavelength Division Multiplexing (DWDM) Networks
RFC 7698

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Internet Engineering Task Force (IETF)          O. Gonzalez de Dios, Ed.
Request for Comments: 7698                                Telefonica I+D
Category: Informational                                 R. Casellas, Ed.
ISSN: 2070-1721                                                     CTTC
                                                                F. Zhang
                                                                  Huawei
                                                                   X. Fu
                                                               Stairnote
                                                           D. Ceccarelli
                                                                Ericsson
                                                              I. Hussain
                                                                Infinera
                                                           November 2015

           Framework and Requirements for GMPLS-Based Control
  of Flexi-Grid Dense Wavelength Division Multiplexing (DWDM) Networks

Abstract

   To allow efficient allocation of optical spectral bandwidth for
   systems that have high bit-rates, the International Telecommunication
   Union Telecommunication Standardization Sector (ITU-T) has extended
   its Recommendations G.694.1 and G.872 to include a new Dense
   Wavelength Division Multiplexing (DWDM) grid by defining a set of
   nominal central frequencies, channel spacings, and the concept of the
   "frequency slot".  In such an environment, a data-plane connection is
   switched based on allocated, variable-sized frequency ranges within
   the optical spectrum, creating what is known as a flexible grid
   (flexi-grid).

   Given the specific characteristics of flexi-grid optical networks and
   their associated technology, this document defines a framework and
   the associated control-plane requirements for the application of the
   existing GMPLS architecture and control-plane protocols to the
   control of flexi-grid DWDM networks.  The actual extensions to the
   GMPLS protocols will be defined in companion documents.

Gonzalez de Dios, et al.      Informational                     [Page 1]
RFC 7698               GMPLS Flexi-Grid Framework          November 2015

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/rfc7698.

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
   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.

Gonzalez de Dios, et al.      Informational                     [Page 2]
RFC 7698               GMPLS Flexi-Grid Framework          November 2015

Table of Contents

   1. Introduction ....................................................4
   2. Terminology .....................................................5
      2.1. Requirements Language ......................................5
      2.2. Abbreviations ..............................................5
   3. Overview of Flexi-Grid Networks .................................6
      3.1. Flexi-Grid in the Context of OTN ...........................6
      3.2. Flexi-Grid Terminology .....................................6
           3.2.1. Frequency Slots .....................................7
           3.2.2. Media-Layer Elements ................................9
           3.2.3. Media Channels .....................................10
           3.2.4. Optical Tributary Signals ..........................10
           3.2.5. Composite Media Channels ...........................11
      3.3. Hierarchy in the Media Layer ..............................11
      3.4. Flexi-Grid Layered Network Model ..........................12
           3.4.1. DWDM Flexi-Grid Enabled Network Element Models .....13
   4. GMPLS Applicability ............................................14