Generalized Labels for the Flexi-Grid in Lambda Switch Capable (LSC) Label Switching Routers
RFC 7699

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Internet Engineering Task Force (IETF)                         A. Farrel
Request for Comments: 7699                                       D. King
Updates: 3471, 6205                                   Old Dog Consulting
Category: Standards Track                                          Y. Li
ISSN: 2070-1721                                       Nanjing University
                                                                F. Zhang
                                                     Huawei Technologies
                                                           November 2015

                Generalized Labels for the Flexi-Grid in
          Lambda Switch Capable (LSC) Label Switching Routers

Abstract

   GMPLS supports the description of optical switching by identifying
   entries in fixed lists of switchable wavelengths (called grids)
   through the encoding of lambda labels.  Work within the ITU-T Study
   Group 15 has defined a finer-granularity grid, and the facility to
   flexibly select different widths of spectrum from the grid.  This
   document defines a new GMPLS lambda label format to support this
   flexi-grid.

   This document updates RFCs 3471 and 6205 by introducing a new label
   format.

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 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/rfc7699.

Farrel, et al.               Standards Track                    [Page 1]
RFC 7699               GMPLS Labels for Flexi-Grid         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
   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
      1.1. Conventions Used in This Document . . . . . . . . . . . . . 4
   2. Overview of Flexi-Grid . . . . . . . . . . . . . . . . . . . . . 4
   3. Fixed-Grid Lambda Label Encoding . . . . . . . . . . . . . . . . 5
   4. Flexi-Grid Label Format and Values . . . . . . . . . . . . . . . 5
      4.1. Flexi-Grid Label Encoding . . . . . . . . . . . . . . . . . 5
      4.2. Considerations of Bandwidth . . . . . . . . . . . . . . . . 7
      4.3. Composite Labels  . . . . . . . . . . . . . . . . . . . . . 7
   5. Manageability and Backward Compatibility Considerations  . . . . 9
      5.1. Control-Plane Backward Compatibility  . . . . . . . . . . . 9
      5.2. Manageability Considerations  . . . . . . . . . . . . . . . 9
   6. Security Considerations . . . . . . . . . . . . . . . . . . . . 10
   7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 10
      7.1. Grid Subregistry . . . . . . . . . . . . . . . . . . . . . 10
      7.2. DWDM Channel Spacing Subregistry . . . . . . . . . . . . . 11
   8. References  . . . . . . . . . . . . . . . . . . . . . . . . . . 11
      8.1. Normative References . . . . . . . . . . . . . . . . . . . 11
      8.2. Informative References . . . . . . . . . . . . . . . . . . 11
   Appendix A. Flexi-Grid Example . . . . . . . . . . . . . . . . . . 13
   Acknowledgments  . . . . . . . . . . . . . . . . . . . . . . . . . 14
   Contributors . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 14

Farrel, et al.               Standards Track                    [Page 2]
RFC 7699               GMPLS Labels for Flexi-Grid         November 2015

1.  Introduction

   As described in [RFC3945], GMPLS extends MPLS from supporting only
   Packet Switch Capable (PSC) interfaces and switching, to also support
   four new classes of interfaces and switching that include Lambda
   Switch Capable (LSC).

   A functional description of the extensions to MPLS signaling needed
   to support this new class of interface and switching is provided in
   [RFC3471].

   Section 3.2.1.1 of [RFC3471] states that wavelength labels "only have
   significance between two neighbors": global wavelength semantics are