draft-ietf-ccamp-flexible-grid-rsvp-te-ext-00.txt   draft-ietf-ccamp-flexible-grid-rsvp-te-ext-01.txt 
Network Working Group Fatai Zhang Network Working Group Fatai Zhang
Internet-Draft Xian Zhang Internet-Draft Xian Zhang
Intended status: Standards Track Huawei Intended status: Standards Track Huawei
Adrian Farrel Adrian Farrel
Old Dog Consulting Old Dog Consulting
Oscar Gonzalez de Dios Oscar Gonzalez de Dios
Telefonica Telefonica
D. Ceccarelli D. Ceccarelli
Ericsson Ericsson
Expires: December 20, 2014 June 20, 2014 Expires: July 6, 2015 January 7, 2015
RSVP-TE Signaling Extensions in support of Flexible Grid 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 Abstract
This memo describes the extensions to RSVP-TE signaling to support This memo describes the extensions to the Resource reservation
Label Switched Paths in a GMPLS-controlled network that includes Protocol Traffic Engineering (RSVP-TE) signaling protocol to support
devices using the flexible optical grid. Label Switched Paths (LSPs) in a GMPLS-controlled network that
includes devices using the flexible optical grid.
Status of this Memo Status of this Memo
This Internet-Draft is submitted to IETF in full conformance with This Internet-Draft is submitted to IETF in full conformance with
the provisions of BCP 78 and BCP 79. the provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF), its areas, and its working groups. Note that Task Force (IETF), its areas, and its working groups. Note that
other groups may also distribute working documents as Internet- other groups may also distribute working documents as Internet-
Drafts. Drafts.
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documents at any time. It is inappropriate to use Internet-Drafts documents at any time. It is inappropriate to use Internet-Drafts
as reference material or to cite them other than as "work in as reference material or to cite them other than as "work in
progress." progress."
The list of current Internet-Drafts can be accessed at The list of current Internet-Drafts can be accessed at
http://www.ietf.org/ietf/1id-abstracts.txt. http://www.ietf.org/ietf/1id-abstracts.txt.
The list of Internet-Draft Shadow Directories can be accessed at The list of Internet-Draft Shadow Directories can be accessed at
http://www.ietf.org/shadow.html. 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 Notice
Copyright (c) 2014 IETF Trust and the persons identified as the Copyright (c) 2014 IETF Trust and the persons identified as the
document authors. All rights reserved. document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of (http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with carefully, as they describe your rights and restrictions with
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5. IANA Considerations ......................................... 7 5. IANA Considerations ......................................... 7
5.1. RSVP Objects Class Types................................ 7 5.1. RSVP Objects Class Types................................ 7
6. Manageability Considerations................................. 8 6. Manageability Considerations................................. 8
7. Implementation Status........................................ 8 7. Implementation Status........................................ 8
7.1. Centre Tecnologic de Telecomunicacions de Catalunya (CTTC)8 7.1. Centre Tecnologic de Telecomunicacions de Catalunya (CTTC)8
8. Acknowledgments ............................................ 10 8. Acknowledgments ............................................ 10
9. Security Considerations..................................... 10 9. Security Considerations..................................... 10
10. References ................................................ 10 10. References ................................................ 10
10.1. Normative References.................................. 10 10.1. Normative References.................................. 10
10.2. Informative References................................ 10 10.2. Informative References................................ 10
11. Contributors' Address...................................... 11 11. Contributors' Addresses.................................... 11
12. Authors' Addresses .........................................12 12. Authors' Addresses ......................................... 12
1. Introduction 1. Introduction
[G.694.1] defines the Dense Wavelength Division Multiplexing (DWDM) [G.694.1] defines the Dense Wavelength Division Multiplexing (DWDM)
frequency grids for Wavelength Division Multiplexing (WDM) frequency grids for Wavelength Division Multiplexing (WDM)
applications. A frequency grid is a reference set of frequencies applications. A frequency grid is a reference set of frequencies
used to denote allowed nominal central frequencies that may be used used to denote allowed nominal central frequencies that may be used
for defining applications that utilize WDM transmission. The channel for defining applications that utilize WDM transmission. The channel
spacing is the frequency spacing between two allowed nominal central spacing is the frequency spacing between two allowed nominal central
frequencies. All of the wavelengths on a fiber use different central frequencies. All of the wavelengths on a fiber use different central
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"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC-2119 [RFC2119]. document are to be interpreted as described in RFC-2119 [RFC2119].
3. Requirements for Flexible Grid Signaling 3. Requirements for Flexible Grid Signaling
The architecture for establishing LSPs in a flexi-grid network is The architecture for establishing LSPs in a flexi-grid network is
described in [FLEX-FWK]. described in [FLEX-FWK].
An optical spectrum LSP occupies a specific frequency slot, i.e., a An optical spectrum LSP occupies a specific frequency slot, i.e., a
range of frequencies. The process of computing a route and the range of frequencies. The process of computing a route and the
allocation of a frequency slot is referred to as RSA (Routing and allocation of a frequency slot is referred to as Routing and
Spectrum Assignment). [FLEX-FWK] describes three architectural Spectrum Assignment (RSA). [FLEX-FWK] describes three architectural
approaches to RSA: combined RSA, separated RSA, and distributed SA. approaches to RSA: combined RSA, separated RSA, and distributed SA.
The first two approaches are referred to as ''centralized SA'' because The first two approaches are referred to as ''centralized SA'' because
both routing and spectrum (frequency slot) assignment are performed both routing and spectrum (frequency slot) assignment are performed
by a centralized entity before the signaling procedure. 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 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 of distributed SA, the slot width of the flexi-grid LSP is specified
in the Path message, allowing the network elements to select the in the Path message, allowing the network elements to select the
frequency slot to be used when they process the RSVP-TE messages. frequency slot to be used when they process the RSVP-TE messages.
If the capability to switch or convert the whole optical spectrum If the capability to switch or convert the whole optical spectrum
allocated to an optical spectrum LSP is not available at some nodes 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 along the path of the LSP, the LSP is subject to the Optical
''Spectrum Continuity Constraint'' as described in [FLEX-FWK]. ''Spectrum Continuity Constraint'' as described in [FLEX-FWK].
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193.1 + n * 0.00625 193.1 + n * 0.00625
where n is zero or a positive or negative integer. where n is zero or a positive or negative integer.
The slot width (in GHz) is defined as: The slot width (in GHz) is defined as:
12.5 * m 12.5 * m
where m is a positive integer. where m is a positive integer.
It is possible that implementing a subset of the possible slot It is possible that an implementation supports only a subset of the
widths and central frequencies are supported. For example, an possible slot widths and central frequencies. For example, an
implementation could built where the nominal central frequency implementation could be built where the nominal central frequency
granularity is 12.5 GHz (by only requiring values of n that are even) 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 and that only supports slot widths as a multiple of 25 GHz (by only
allowing values of m that are even). allowing values of m that are even).
Further details can be found in [FLEX-FWK]. Further details can be found in [FLEX-FWK].
4. Protocol Extensions 4. Protocol Extensions
This section defines the extensions to RSVP-TE signaling for GMPLS This section defines the extensions to RSVP-TE signaling for GMPLS
[RFC3473] to support flexible grid networks. [RFC3473] to support flexible grid networks.
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4.2. Generalized Label 4.2. Generalized Label
In the case of a flexible grid network, the labels that have been In the case of a flexible grid network, the labels that have been
requested or allocated as signaled in the RSVP-TE objects are requested or allocated as signaled in the RSVP-TE objects are
encoded as described in [FLEX-LBL]. This new label encoding can 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. 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 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. 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 4.3. Signaling Procedures
There are no differences between the signaling procedure described There are no differences between the signaling procedure described
for LSP control in [FLEX-FWK] and those required for use in a fixed- for LSP control in [FLEX-FWK] and those required for use in a fixed-
grid network [WSON-SIG]. Obviously, the TSpec, FlowSpec, and label grid network [WSON-SIG]. Obviously, the TSpec, FlowSpec, and label
formats described in Section 3 are used. The signaling procedures formats described in Sections 4.1 and 4.2 are used. The signaling
for distributed SA and centralized SA can be applied. procedures for distributed SA and centralized SA can be applied.
5. IANA Considerations 5. IANA Considerations
5.1. RSVP Objects Class Types 5.1. RSVP Objects Class Types
This document introduces two new Class Types for existing RSVP This document introduces two new Class Types for existing RSVP
objects. IANA is requested to make allocations from the "Resource objects. IANA is requested to make allocations from the "Resource
ReSerVation Protocol (RSVP) Parameters" registry using the "Class ReSerVation Protocol (RSVP) Parameters" registry using the "Class
Names, Class Numbers, and Class Types" sub-registry. Names, Class Numbers, and Class Types" sub-registry.
Class Number Class Name Reference Class Number Class Name Reference
------------ ----------------------- --------- ------------ ----------------------- ---------
9 FLOWSPEC [RFC2205] 9 FLOWSPEC [RFC2205]
Class Type (C-Type): Class Type (C-Type):
(TBD2) SSON FLOWSPEC [This.I-D] (TBD2) SSON FLOWSPEC [This.I-D]
Class Number Class Name Reference Class Number Class Name Reference
------------ ----------------------- --------- ------------ ----------------------- ---------
12 SENDER_TSPEC [RFC2205] 12 SENDER_TSPEC [RFC2205]
Class Type (C-Type): Class Type (C-Type):
(TBD1) SSON SENDER_TSPEC [This.I-D] (TBD1) SSON SENDER_TSPEC [This.I-D]
IANA is requested to assign the same value for TBD1 and TBD2, and a IANA is requested to assign the same value for TBD1 and TBD2, and a
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[RFC3473] L. Berger, Ed., "Generalized Multi-Protocol Label [RFC3473] L. Berger, Ed., "Generalized Multi-Protocol Label
Switching (GMPLS) Signaling Resource ReserVation Protocol- Switching (GMPLS) Signaling Resource ReserVation Protocol-
Traffic Engineering (RSVP-TE) Extensions", RFC 3473, Traffic Engineering (RSVP-TE) Extensions", RFC 3473,
January 2003. January 2003.
[G.694.1] ITU-T Recommendation G.694.1 (revision 2), ''Spectral grids [G.694.1] ITU-T Recommendation G.694.1 (revision 2), ''Spectral grids
for WDM applications: DWDM frequency grid'', February 2012. for WDM applications: DWDM frequency grid'', February 2012.
[FLEX-LBL]King, D., Farrel, A. and Y. Li, ''Generalized Labels for [FLEX-LBL]King, D., Farrel, A. and Y. Li, ''Generalized Labels for
the Flexi-Grid in Lambda Switched Capable (LSC) Label the Flexi-Grid in Lambda Switched Capable (LSC) Label
Switching Routers'', draft-farrkingel-ccamp-flexigrid- Switching Routers'', draft-ietf-ccamp-flexigrid-lambda-
lambda-label, work in progress. label, work in progress.
10.2. Informative References 10.2. Informative References
[RFC2205] Braden, R., Zhang L., Berson, S., Herzog, S. and S. Jamin, [RFC2205] Braden, R., Zhang L., Berson, S., Herzog, S. and S. Jamin,
''Resource ReServation Protocol (RSVP) - - Version 1, ''Resource ReServation Protocol (RSVP) - - Version 1,
Functional Specification', RFC2205, September 1997. Functional Specification', RFC2205, September 1997.
[RFC5920] L. Fang et al., "Security Framework for MPLS and GMPLS [RFC5920] L. Fang et al., "Security Framework for MPLS and GMPLS
Networks", RFC 5920, July 2010. Networks", RFC 5920, July 2010.
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and Path Computation Element (PCE) Control of Wavelength and Path Computation Element (PCE) Control of Wavelength
Switched Optical Networks (WSONs)", RFC 6163, April 2011. Switched Optical Networks (WSONs)", RFC 6163, April 2011.
[RFC6982] Sheffer, Y. and A. Farrel, "Improving Awareness of Running [RFC6982] Sheffer, Y. and A. Farrel, "Improving Awareness of Running
Code: The Implementation Status Section", RFC 6982, July Code: The Implementation Status Section", RFC 6982, July
2013. 2013.
[RFC Editor Note: This reference can be removed when Section 7 is [RFC Editor Note: This reference can be removed when Section 7 is
removed] 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 Ceccarelli, D., and I. Hussain, ''Framework and
Requirements for GMPLS based control of Flexi-grid DWDM 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. progress.
[WSON-SIG] G. Bernstein, Sugang Xu, Y. Lee, G. Martinelli and [WSON-SIG] G. Bernstein, Sugang Xu, Y. Lee, G. Martinelli and
Hiroaki Harai, "Signaling Extensions for Wavelength Hiroaki Harai, "Signaling Extensions for Wavelength
Switched Optical Networks", draft-ietf-ccamp-wson- Switched Optical Networks", draft-ietf-ccamp-wson-
signaling, work in progress. signaling, work in progress.
11. Contributors' Address 11. Contributors' Addresses
Ramon Casellas Ramon Casellas
CTTC CTTC
Av. Carl Friedrich Gauss n7 Av. Carl Friedrich Gauss n7
Castelldefels, Barcelona 08860 Castelldefels, Barcelona 08860
Spain Spain
Email: ramon.casellas@cttc.es Email: ramon.casellas@cttc.es
Felipe Jimenez Arribas Felipe Jimenez Arribas
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