--- 1/draft-ietf-ccamp-flexible-grid-rsvp-te-ext-00.txt 2015-01-06 23:14:50.041854447 -0800 +++ 2/draft-ietf-ccamp-flexible-grid-rsvp-te-ext-01.txt 2015-01-06 23:14:50.069855121 -0800 @@ -1,30 +1,31 @@ Network Working Group Fatai Zhang Internet-Draft Xian Zhang Intended status: Standards Track Huawei Adrian Farrel Old Dog Consulting Oscar Gonzalez de Dios Telefonica D. Ceccarelli Ericsson -Expires: December 20, 2014 June 20, 2014 +Expires: July 6, 2015 January 7, 2015 RSVP-TE Signaling Extensions in support of Flexible Grid - draft-ietf-ccamp-flexible-grid-rsvp-te-ext-00.txt + draft-ietf-ccamp-flexible-grid-rsvp-te-ext-01.txt Abstract - This memo describes the extensions to RSVP-TE signaling to support - Label Switched Paths in a GMPLS-controlled network that includes - devices using the flexible optical grid. + 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 Internet-Draft is submitted to IETF in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF), its areas, and its working groups. Note that other groups may also distribute working documents as Internet- Drafts. @@ -34,21 +35,21 @@ documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." The list of current Internet-Drafts can be accessed at http://www.ietf.org/ietf/1id-abstracts.txt. The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html. - This Internet-Draft will expire on December 20, 2014. + This Internet-Draft will expire on July 6, 2015. Copyright Notice 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 @@ -73,21 +74,21 @@ 5. IANA Considerations ......................................... 7 5.1. RSVP Objects Class Types................................ 7 6. Manageability Considerations................................. 8 7. Implementation Status........................................ 8 7.1. Centre Tecnologic de Telecomunicacions de Catalunya (CTTC)8 8. Acknowledgments ............................................ 10 9. Security Considerations..................................... 10 10. References ................................................ 10 10.1. Normative References.................................. 10 10.2. Informative References................................ 10 - 11. Contributors' Address...................................... 11 + 11. Contributors' Addresses.................................... 11 12. Authors' Addresses .........................................12 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 @@ -126,29 +127,29 @@ "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC-2119 [RFC2119]. 3. Requirements for Flexible Grid Signaling The architecture for establishing LSPs in a flexi-grid network is described in [FLEX-FWK]. An optical spectrum LSP occupies a specific frequency slot, i.e., a range of frequencies. The process of computing a route and the - allocation of a frequency slot is referred to as RSA (Routing and - Spectrum Assignment). [FLEX-FWK] describes three architectural + allocation of a frequency slot is referred to as Routing and + Spectrum Assignment (RSA). [FLEX-FWK] describes three architectural approaches to RSA: combined RSA, separated RSA, and distributed SA. The first two approaches are referred to as ''centralized SA'' because both routing and spectrum (frequency slot) assignment are performed by a centralized entity before the signaling procedure. - In the case of centralized SA the assigned frequency slot is + In the case of centralized SA, the assigned frequency slot is specified in the RSVP-TE Path message during LSP setup. In the case of distributed SA, the slot width of the flexi-grid LSP is specified in the Path message, allowing the network elements to select the frequency slot to be used when they process the RSVP-TE messages. If the capability to switch or convert the whole optical spectrum allocated to an optical spectrum LSP is not available at some nodes along the path of the LSP, the LSP is subject to the Optical ''Spectrum Continuity Constraint'' as described in [FLEX-FWK]. @@ -201,24 +202,24 @@ 193.1 + n * 0.00625 where n is zero or a positive or negative integer. The slot width (in GHz) is defined as: 12.5 * m where m is a positive integer. - It is possible that implementing a subset of the possible slot - widths and central frequencies are supported. For example, an - implementation could built where the nominal central frequency - granularity is 12.5 GHz (by only requiring values of n that are even) + It is possible that an implementation supports only a subset of the + possible slot widths and central frequencies. For example, an + implementation could be built where the nominal central frequency + granularity is 12.5 GHz (by only allowing values of n that are even) and that only supports slot widths as a multiple of 25 GHz (by only allowing values of m that are even). Further details can be found in [FLEX-FWK]. 4. Protocol Extensions This section defines the extensions to RSVP-TE signaling for GMPLS [RFC3473] to support flexible grid networks. @@ -272,27 +273,31 @@ 4.2. Generalized Label In the case of a flexible grid network, the labels that have been requested or allocated as signaled in the RSVP-TE objects are encoded as described in [FLEX-LBL]. This new label encoding can appear in any RSVP-TE object or sub-object that can carry a label. As noted in Section 4.2 of [FLEX-LBL], the m parameter forms part of the label as well as part of the traffic parameters. + As described in Section 4.3 of [FLEX-LBL], a ''compound label'', + constructed from a concatenation of the flexi-grid LABELs, is used + when signaling an LSP that uses multiple flexi-grid slots. + 4.3. Signaling Procedures There are no differences between the signaling procedure described for LSP control in [FLEX-FWK] and those required for use in a fixed- grid network [WSON-SIG]. Obviously, the TSpec, FlowSpec, and label - formats described in Section 3 are used. The signaling procedures - for distributed SA and centralized SA can be applied. + formats described in Sections 4.1 and 4.2 are used. The signaling + procedures for distributed SA and centralized SA can be applied. 5. IANA Considerations 5.1. RSVP Objects Class Types This document introduces two new Class Types for existing RSVP objects. IANA is requested to make allocations from the "Resource ReSerVation Protocol (RSVP) Parameters" registry using the "Class Names, Class Numbers, and Class Types" sub-registry. @@ -419,22 +424,22 @@ [RFC3473] L. Berger, Ed., "Generalized Multi-Protocol Label Switching (GMPLS) Signaling Resource ReserVation Protocol- Traffic Engineering (RSVP-TE) Extensions", RFC 3473, January 2003. [G.694.1] ITU-T Recommendation G.694.1 (revision 2), ''Spectral grids for WDM applications: DWDM frequency grid'', February 2012. [FLEX-LBL]King, D., Farrel, A. and Y. Li, ''Generalized Labels for the Flexi-Grid in Lambda Switched Capable (LSC) Label - Switching Routers'', draft-farrkingel-ccamp-flexigrid- - lambda-label, work in progress. + Switching Routers'', draft-ietf-ccamp-flexigrid-lambda- + label, work in progress. 10.2. Informative References [RFC2205] Braden, R., Zhang L., Berson, S., Herzog, S. and S. Jamin, ''Resource ReServation Protocol (RSVP) - - Version 1, Functional Specification', RFC2205, September 1997. [RFC5920] L. Fang et al., "Security Framework for MPLS and GMPLS Networks", RFC 5920, July 2010. @@ -442,32 +447,32 @@ and Path Computation Element (PCE) Control of Wavelength Switched Optical Networks (WSONs)", RFC 6163, April 2011. [RFC6982] Sheffer, Y. and A. Farrel, "Improving Awareness of Running Code: The Implementation Status Section", RFC 6982, July 2013. [RFC Editor Note: This reference can be removed when Section 7 is removed] - [FLEX-FWK] Gonzalez de Dios, O,, Casellas R., Zhang, F., Fu, X., + [FLEX-FWK] Gonzalez de Dios, O, Casellas R., Zhang, F., Fu, X., Ceccarelli, D., and I. Hussain, ''Framework and Requirements for GMPLS based control of Flexi-grid DWDM - networks', draft-ogrcetal-cammp-flexi-grid-fwk, work in + networks', draft-ietf-cammp-flexi-grid-fwk, work in progress. [WSON-SIG] G. Bernstein, Sugang Xu, Y. Lee, G. Martinelli and Hiroaki Harai, "Signaling Extensions for Wavelength Switched Optical Networks", draft-ietf-ccamp-wson- signaling, work in progress. -11. Contributors' Address +11. Contributors' Addresses Ramon Casellas CTTC Av. Carl Friedrich Gauss n7 Castelldefels, Barcelona 08860 Spain Email: ramon.casellas@cttc.es Felipe Jimenez Arribas