--- 1/draft-ietf-ccamp-flexi-grid-fwk-00.txt 2014-02-14 12:14:41.705561273 -0800 +++ 2/draft-ietf-ccamp-flexi-grid-fwk-01.txt 2014-02-14 12:14:41.769562839 -0800 @@ -1,28 +1,28 @@ Network Working Group O. Gonzalez de Dios, Ed. Internet-Draft Telefonica I+D Intended status: Standards Track R. Casellas, Ed. -Expires: April 05, 2014 CTTC +Expires: August 18, 2014 CTTC F. Zhang Huawei X. Fu ZTE D. Ceccarelli Ericsson I. Hussain Infinera - October 02, 2013 + February 14, 2014 Framework and Requirements for GMPLS based control of Flexi-grid DWDM networks - draft-ietf-ccamp-flexi-grid-fwk-00 + draft-ietf-ccamp-flexi-grid-fwk-01 Abstract This document defines a framework and the associated control plane requirements for the GMPLS based control of flexi-grid DWDM networks. To allow efficient allocation of optical spectral bandwidth for high bit-rate systems, the International Telecommunication Union Telecommunication Standardization Sector (ITU-T) has extended the recommendations [G.694.1] and [G.872] to include the concept of flexible grid. A new DWDM grid has been developed within the ITU-T @@ -38,25 +38,25 @@ Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at http://datatracker.ietf.org/drafts/current/. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." - This Internet-Draft will expire on April 05, 2014. + This Internet-Draft will expire on August 18, 2014. Copyright Notice - Copyright (c) 2013 IETF Trust and the persons identified as the + Copyright (c) 2014 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 @@ -70,46 +70,47 @@ 4. Flexi-grid Networks . . . . . . . . . . . . . . . . . . . . . 4 4.1. Flexi-grid in the context of OTN . . . . . . . . . . . . 4 4.2. Terminology . . . . . . . . . . . . . . . . . . . . . . . 5 4.2.1. Frequency Slots . . . . . . . . . . . . . . . . . . . 5 4.2.2. Media Channels . . . . . . . . . . . . . . . . . . . 7 4.2.3. Media Layer Elements . . . . . . . . . . . . . . . . 7 4.2.4. Optical Tributary Signals . . . . . . . . . . . . . . 8 4.3. Flexi-grid layered network model . . . . . . . . . . . . 8 4.3.1. Hierarchy in the Media Layer . . . . . . . . . . . . 9 4.3.2. DWDM flexi-grid enabled network element models . . . 10 - 5. GMPLS applicability . . . . . . . . . . . . . . . . . . . . . 10 + 5. GMPLS applicability . . . . . . . . . . . . . . . . . . . . . 11 5.1. General considerations . . . . . . . . . . . . . . . . . 11 5.2. Considerations on TE Links . . . . . . . . . . . . . . . 11 5.3. Considerations on Labeled Switched Path (LSP) in Flexi- - grid . . . . . . . . . . . . . . . . . . . . . . . . . . 13 - 5.4. Control Plane modeling of Network elements . . . . . . . 17 - 5.5. Media Layer Resource Allocation considerations . . . . . 17 - 5.6. Neighbor Discovery and Link Property Correlation . . . . 21 - 5.7. Path Computation / Routing and Spectrum Assignment (RSA) 21 - 5.7.1. Architectural Approaches to RSA . . . . . . . . . . . 22 - 5.8. Routing / Topology dissemination . . . . . . . . . . . . 23 - 5.8.1. Available Frequency Ranges/slots of DWDM Links . . . 23 - 5.8.2. Available Slot Width Ranges of DWDM Links . . . . . . 23 - 5.8.3. Spectrum Management . . . . . . . . . . . . . . . . . 23 - 5.8.4. Information Model . . . . . . . . . . . . . . . . . . 24 - 6. Control Plane Requirements . . . . . . . . . . . . . . . . . 25 - 6.1. Functional requirements . . . . . . . . . . . . . . . . . 25 - 6.2. Routing/Topology Dissemination requirements . . . . . . . 25 - 6.3. Signaling requirements . . . . . . . . . . . . . . . . . 25 - 7. Security Considerations . . . . . . . . . . . . . . . . . . . 25 - 8. Contributing Authors . . . . . . . . . . . . . . . . . . . . 25 - 9. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 27 - 10. References . . . . . . . . . . . . . . . . . . . . . . . . . 28 - 10.1. Normative References . . . . . . . . . . . . . . . . . . 28 - 10.2. Informative References . . . . . . . . . . . . . . . . . 29 - Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 29 + grid . . . . . . . . . . . . . . . . . . . . . . . . . . 14 + 5.4. Control Plane modeling of Network elements . . . . . . . 18 + 5.5. Media Layer Resource Allocation considerations . . . . . 19 + 5.6. Neighbor Discovery and Link Property Correlation . . . . 23 + 5.7. Path Computation / Routing and Spectrum Assignment (RSA) 23 + 5.7.1. Architectural Approaches to RSA . . . . . . . . . . . 24 + 5.8. Routing / Topology dissemination . . . . . . . . . . . . 24 + 5.8.1. Available Frequency Ranges/slots of DWDM Links . . . 25 + 5.8.2. Available Slot Width Ranges of DWDM Links . . . . . . 25 + 5.8.3. Spectrum Management . . . . . . . . . . . . . . . . . 25 + 5.8.4. Information Model . . . . . . . . . . . . . . . . . . 26 + 6. Control Plane Requirements . . . . . . . . . . . . . . . . . 27 + 6.1. Support for Media Channels . . . . . . . . . . . . . . . 27 + 6.2. Support for Media Channel Resizing . . . . . . . . . . . 27 + 6.3. Support for Logical Associations of multiple media + channels . . . . . . . . . . . . . . . . . . . . . . . . 28 + 7. Security Considerations . . . . . . . . . . . . . . . . . . . 28 + 8. Contributing Authors . . . . . . . . . . . . . . . . . . . . 28 + 9. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 30 + 10. References . . . . . . . . . . . . . . . . . . . . . . . . . 30 + 10.1. Normative References . . . . . . . . . . . . . . . . . . 30 + 10.2. Informative References . . . . . . . . . . . . . . . . . 32 + Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 32 1. Requirements Language The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in [RFC2119]. 2. Introduction The term "Flexible grid" (flexi-grid for short) as defined by the @@ -355,22 +356,22 @@ | \ (1) | | (1) | | (1) / | | \----|-----------------|-----------|-------------------|-----/ | +--------+ Link Channel +-----------+ Link Channel +--------+ Media Channel Media Channel Media Channel Matrix Matrix Matrix (1) - Matrix Channel Figure 5: Simplified Layered Network Model - A particular example of Optical Tributary Signal is the OCh-P. Figure - Figure 6 shows the example of the layered network model + A particular example of Optical Tributary Signal is the OCh-P. + Figure Figure 6 shows the example of the layered network model particularized for the OCH-P case, as defined in G.805. OCh AP Trail (OCh) OCh AP O- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - O | | --- OCh-P OCh-P --- \ / source sink \ / + + | OCh-P OCh-P Network Connection OCh-P | O TCP - - - - - - - - - - - - - - - - - - - - - - - - - - -TCP O @@ -1095,66 +1098,86 @@ ::= [< Available Frequency Range-List>] ::= | - ::= n x 6.25GHz, + ::= n A— 6.25GHz, where n is positive integer, such as 6.25GHz, 12.5GHz, 25GHz, 50GHz or 100GHz - ::= m x 12.5GHz, + ::= m A— 12.5GHz, where m is positive integer ::= j x 12.5GHz, j is a positive integer ::= k x 12.5GHz, k is a positive integer (k >= j) Figure 17: Routing Information model 6. Control Plane Requirements - This section provides a high level view of the requirements for GMPLS - /PCE flexi-grid control plane. A detailed list of requirements will - be provided in the next version of the document + The GMPLS based control plane of a flexi-grid networks provides + aditional requirements to GMPLS. In this section the features to be + covered by GMPLS signaling for flexi-grid are identified. [Editor's + note: Only discussed requirements are included at this stage. + Routing requirements will come in the next version] -6.1. Functional requirements +6.1. Support for Media Channels - o It must be able to dynamically set up media channels + The control plane SHALL be able to support Media Channels, + characterized by a single frequency slot. The representation of the + Media Channel in the GMPLS Control plane is the so-called flexi-grid + LSP. Since network media channels are media channels, an LSP may + also be the control plane representation of a network media channel. + Consequently, the control plane SHALL be able to support Network + Media Channels. - o It must be able to dynamically set up network media channels + The signaling procedure SHALL be able to configure the nominal + central frequency (n) of a flexi-grid LSP. - o It must must be able to dynamically set up a set of co-routed - network media channels, and associate them logically + The control plane protocols SHALL allow flexible range of values for + the frequency slot width (m) parameter. Specifically, the control + plane SHALL allow setting up a media channel with frequency slot + width (m) ranging from a minimum of m=1 (12.5GHz) to a maximum of the + entire C-band with a slot width granularity of 12.5GHz. -6.2. Routing/Topology Dissemination requirements + The signaling procedure of the GMPLS control plane SHALL be able to + configure the minimum width (m) of a flexi-grid LSP. In adition, the + control plane SHALL be able to configure local frecuency slots, - The computation entity needs to get the detailed network information: - connectivity topology, node capabilities and available frequency - ranges of the links + The control plane architecture SHOULD allow for the support of L-band + and S-band -6.3. Signaling requirements + The signalling process of the control plane SHALL allow to collect + the local frequency slot asigned at each link along the path - o The signaling must be able to configure the minimum width (m) of - an LSP. +6.2. Support for Media Channel Resizing - o The signaling must be able to configure the nominal central - frequency (n) of an LSP. + The control plane SHALL allow resizing (grow or shrink) the frequency + slot width of a media channel/network media channel. The resizing + MAY imply resizing the local frequency slots along the path of the + flexi-grid LSP. - o It must be possible to collect the local frequency slot asigned at - each link along the path +6.3. Support for Logical Associations of multiple media channels + + A set of media channels can be used to transport signals that have a + logical association between them. The control plane architecture + SHOULD allow multiple media channels to be logically associated. The + control plane SHOULD allow the co-routing of a set of media channels + logically associated 7. Security Considerations TBD 8. Contributing Authors Qilei Wang ZTE Ruanjian Avenue, Nanjing, China @@ -1229,37 +1251,38 @@ Marco Sosa Infinera Biao Lu Infinera Abinder Dhillon Infinera Felipe Jimenez Arribas - Telefonica I+D + TelefA^3nica I+D Andrew G. Malis Verizon Adrian Farrel Old Dog Consulting Daniel King Old Dog Consulting Huub van Helvoort 9. Acknowledgments The authors would like to thank Pete Anslow for his insights and - clarifications. + clarifications. This work was supported in part by the FP-7 IDEALIST + project under grant agreement number 317999. 10. References 10.1. Normative References [G.694.1] International Telecomunications Union, "ITU-T Recommendation G.694.1, Spectral grids for WDM applications: DWDM frequency grid", November 2012. [G.709] International Telecomunications Union, "ITU-T