GMPLS OSPF-TE Extensions in Support of Flexi-Grid Dense Wavelength Division Multiplexing (DWDM) Networks
RFC 8363

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Internet Engineering Task Force (IETF)                          X. Zhang
Request for Comments: 8363                                      H. Zheng
Category: Standards Track                                         Huawei
ISSN: 2070-1721                                              R. Casellas
                                                                    CTTC
                                                     O. Gonzalez de Dios
                                                              Telefonica
                                                           D. Ceccarelli
                                                                Ericsson
                                                                May 2018

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

Abstract

   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 channel spacings, a set of
   nominal central frequencies, and the concept of the "frequency slot".
   Corresponding techniques for data-plane connections are known as
   "flexi-grid".

   Based on the characteristics of flexi-grid defined in G.694.1 and in
   RFCs 7698 and 7699, this document describes the Open Shortest Path
   First - Traffic Engineering (OSPF-TE) extensions in support of GMPLS
   control of networks that include devices that use the new 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 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/rfc8363.

Zhang, et al.                Standards Track                    [Page 1]
RFC 8363            GMPLS OSPF-TE for Flexi-Grid DWDM           May 2018

Copyright Notice

   Copyright (c) 2018 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
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   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 . . . . . . . . . . . .   4
   3.  Requirements for Flexi-Grid Routing . . . . . . . . . . . . .   4
     3.1.  Available Frequency Ranges  . . . . . . . . . . . . . . .   4
     3.2.  Application Compliance Considerations . . . . . . . . . .   5
     3.3.  Comparison with Fixed-Grid DWDM Links . . . . . . . . . .   6
   4.  Extensions  . . . . . . . . . . . . . . . . . . . . . . . . .   7
     4.1.  Interface Switching Capability Descriptor (ISCD)
           Extensions for Flexi-Grid . . . . . . . . . . . . . . . .   7
       4.1.1.  Switching Capability Specific Information (SCSI)  . .   8
       4.1.2.  An SCSI Example . . . . . . . . . . . . . . . . . . .  10
     4.2.  Extensions to the Port Label Restrictions Field . . . . .  11
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  13
     5.1.  New ISCD Switching Type . . . . . . . . . . . . . . . . .  13
     5.2.  New SCSI Type . . . . . . . . . . . . . . . . . . . . . .  13
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  13
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  14
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .  14
     7.2.  Informative References  . . . . . . . . . . . . . . . . .  15
   Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . .  16
   Contributors  . . . . . . . . . . . . . . . . . . . . . . . . . .  16
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  17

Zhang, et al.                Standards Track                    [Page 2]
RFC 8363            GMPLS OSPF-TE for Flexi-Grid DWDM           May 2018

1.  Introduction

   [G.694.1] defines the Dense Wavelength Division Multiplexing (DWDM)
   frequency grids for Wavelength Division Multiplexing (WDM)