RSVP-TE Signaling Extensions in Support of Flexi-Grid Dense Wavelength Division Multiplexing (DWDM) Networks
RFC 7792

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Internet Engineering Task Force (IETF)                          F. Zhang
Request for Comments: 7792                                      X. Zhang
Category: Standards Track                                         Huawei
ISSN: 2070-1721                                                A. Farrel
                                                      Old Dog Consulting
                                                     O. Gonzalez de Dios
                                                              Telefonica
                                                           D. Ceccarelli
                                                                Ericsson
                                                              March 2016

         RSVP-TE Signaling Extensions in Support of Flexi-Grid
         Dense Wavelength Division Multiplexing (DWDM) Networks

Abstract

   This memo describes the extensions to the Resource Reservation
   Protocol - Traffic Engineering (RSVP-TE) signaling protocol to
   support Label Switched Paths (LSPs) in a GMPLS-controlled network
   that includes devices using the flexible optical grid.

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/rfc7792.

Zhang, et al.                Standards Track                    [Page 1]
RFC 7792         Flexi-Grid RSVP-TE Signaling Extensions      March 2016

Copyright Notice

   Copyright (c) 2016 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
      2.1. Conventions Used in This Document ..........................3
   3. Requirements for Flexible-Grid Signaling ........................4
      3.1. Slot Width .................................................4
      3.2. Frequency Slot .............................................5
   4. Protocol Extensions .............................................6
      4.1. Traffic Parameters .........................................6
           4.1.1. Applicability to Fixed-Grid Networks ................7
      4.2. Generalized Label ..........................................7
      4.3. Signaling Procedures .......................................7
   5. IANA Considerations .............................................8
      5.1. Class Types for RSVP Objects ...............................8
   6. Manageability Considerations ....................................8
   7. Security Considerations .........................................8
   8. References ......................................................9
      8.1. Normative References .......................................9
      8.2. Informative References .....................................9
   Acknowledgments ...................................................11
   Contributors ......................................................11
   Authors' Addresses ................................................12

Zhang, et al.                Standards Track                    [Page 2]
RFC 7792         Flexi-Grid RSVP-TE Signaling Extensions      March 2016

1.  Introduction

   [G.694.1] defines the Dense Wavelength Division Multiplexing (DWDM)
   frequency grids for Wavelength Division Multiplexing (WDM)
   applications.  A frequency grid is a reference set of frequencies
   used to denote allowed nominal central frequencies that may be used
   for defining applications that utilize WDM transmission.  The channel
   spacing is the frequency spacing between two allowed nominal central
   frequencies.  All of the wavelengths on a fiber use different central
   frequencies and occupy a designated range of frequencies.

   Fixed-grid channel spacing is selected from 12.5 GHz, 25 GHz, 50 GHz,
   100 GHz, and integer multiples of 100 GHz.  Additionally, [G.694.1]