Framework and Requirements for GMPLS-based control of Flexi-grid DWDM networks
draft-ietf-ccamp-flexi-grid-fwk-05

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Last updated 2015-08-06 (latest revision 2015-05-25)
Replaces draft-ogrcetal-ccamp-flexi-grid-fwk
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CCAMP Working Group                             O. Gonzalez de Dios, Ed.
Internet-Draft                                            Telefonica I+D
Intended status: Informational                          R. Casellas, Ed.
Expires: November 26, 2015                                          CTTC
                                                            May 25, 2015

 Framework and Requirements for GMPLS-based control of Flexi-grid DWDM
                                networks
                   draft-ietf-ccamp-flexi-grid-fwk-05

Abstract

   To allow efficient allocation of optical spectral bandwidth for high
   bit-rate systems, 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 "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).

   This document defines a framework and the associated control plane
   requirements for the GMPLS-based control of flexi-grid DWDM networks.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on November 26, 2015.

Gonzalez de Dios & CaselExpires November 26, 2015               [Page 1]
Internet-Draft         GMPLS Flexi-grid Framework               May 2015

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
     2.1.  Requirements Language . . . . . . . . . . . . . . . . . .   4
     2.2.  Abbreviations . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Overview of Flexi-grid Networks . . . . . . . . . . . . . . .   5
     3.1.  Flexi-grid in the Context of OTN  . . . . . . . . . . . .   5
     3.2.  Flexi-grid Terminology  . . . . . . . . . . . . . . . . .   6
       3.2.1.  Frequency Slots . . . . . . . . . . . . . . . . . . .   6
       3.2.2.  Media Layer Elements  . . . . . . . . . . . . . . . .   8
       3.2.3.  Media Channels  . . . . . . . . . . . . . . . . . . .   8
       3.2.4.  Optical Tributary Signals . . . . . . . . . . . . . .   9
       3.2.5.  Composite Media Channels  . . . . . . . . . . . . . .   9
     3.3.  Hierarchy in the Media Layer  . . . . . . . . . . . . . .  10
     3.4.  Flexi-grid Layered Network Model  . . . . . . . . . . . .  10
       3.4.1.  DWDM Flexi-grid Enabled Network Element Models  . . .  12
   4.  GMPLS Applicability . . . . . . . . . . . . . . . . . . . . .  12
     4.1.  General Considerations  . . . . . . . . . . . . . . . . .  12
     4.2.  Consideration of TE Links . . . . . . . . . . . . . . . .  13
     4.3.  Consideration of LSPs in Flexi-grid . . . . . . . . . . .  15
     4.4.  Control Plane Modeling of Network Elements  . . . . . . .  20
     4.5.  Media Layer Resource Allocation Considerations  . . . . .  20
     4.6.  Neighbor Discovery and Link Property Correlation  . . . .  24
     4.7.  Path Computation / Routing and Spectrum Assignment (RSA)   25
       4.7.1.  Architectural Approaches to RSA . . . . . . . . . . .  25
     4.8.  Routing and Topology Dissemination  . . . . . . . . . . .  26
       4.8.1.  Available Frequency Ranges/Slots of DWDM Links  . . .  27
       4.8.2.  Available Slot Width Ranges of DWDM Links . . . . . .  27
       4.8.3.  Spectrum Management . . . . . . . . . . . . . . . . .  27
       4.8.4.  Information Model . . . . . . . . . . . . . . . . . .  27
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