draft-ietf-ccamp-flexible-grid-rsvp-te-ext-01.txt   draft-ietf-ccamp-flexible-grid-rsvp-te-ext-02.txt 
Network Working Group Fatai Zhang CCAMP 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: July 6, 2015 January 7, 2015 Expires: July 30, 2015 January 30, 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-01.txt draft-ietf-ccamp-flexible-grid-rsvp-te-ext-02.txt
Abstract Abstract
This memo describes the extensions to the Resource reservation This memo describes the extensions to the Resource reserVation
Protocol Traffic Engineering (RSVP-TE) signaling protocol to support Protocol Traffic Engineering (RSVP-TE) signaling protocol to support
Label Switched Paths (LSPs) in a GMPLS-controlled network that Label Switched Paths (LSPs) in a GMPLS-controlled network that
includes devices using the flexible optical grid. 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
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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 July 6, 2015. This Internet-Draft will expire on July 30, 2015.
Copyright Notice Copyright Notice
Copyright (c) 2014 IETF Trust and the persons identified as the Copyright (c) 2015 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
respect to this document. Code Components extracted from this respect to this document. Code Components extracted from this
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Section 4.e of the Trust Legal Provisions and are provided without Section 4.e of the Trust Legal Provisions and are provided without
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4.3. Signaling Procedures.................................... 7 4.3. Signaling Procedures.................................... 7
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' Addresses.................................... 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
frequencies and occupy a designated range of frequency. frequencies and occupy a designated range of frequency.
Fixed grid channel spacing is selected from 12.5 GHz, 25 GHz, 50 GHz, Fixed grid channel spacing is selected from 12.5 GHz, 25 GHz, 50 GHz,
100 GHz and integer multiples of 100 GHz. But [G.694.1] also defines 100 GHz and integer multiples of 100 GHz. But [G.694.1] also defines
''flexible grids'', known as ''flexi-grid''. The terms ''frequency slot'' "flexible grids", known as "flexi-grid". The terms "frequency slot"
(i.e., the frequency range allocated to a specific channel and (i.e., the frequency range allocated to a specific channel and
unavailable to other channels within a flexible grid) and ''slot unavailable to other channels within a flexible grid) and "slot
width'' (i.e., the full width of a frequency slot in a flexible grid) width" (i.e., the full width of a frequency slot in a flexible grid)
are introduced in [G.694.1] to define a flexible grid. are introduced in [G.694.1] to define a flexible grid.
[FLEX-FWK] defines a framework and the associated control plane [FLEX-FWK] defines a framework and the associated control plane
requirements for the GMPLS based control of flexi-grid DWDM networks. requirements for the GMPLS based control of flexi-grid DWDM networks.
[RFC6163] provides a framework for GMPLS and Path Computation [RFC6163] provides a framework for GMPLS and Path Computation
Element (PCE) control of Wavelength Switched Optical Networks Element (PCE) control of Wavelength Switched Optical Networks
(WSONs), and [WSON-SIG] describes the requirements and protocol (WSONs), and [WSON-SIG] describes the requirements and protocol
extensions for signaling to set up Label Switched Paths (LSPs) in extensions for signaling to set up Label Switched Paths (LSPs) in
WSONs. WSONs.
skipping to change at page 4, line 5 skipping to change at page 4, line 5
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 Routing and allocation of a frequency slot is referred to as Routing and
Spectrum Assignment (RSA). [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].
The remainder of this section states the additional requirements for The remainder of this section states the additional requirements for
signaling in a flexi-grid network. signaling in a flexi-grid network.
3.1. Slot Width 3.1. Slot Width
The slot width is an end-to-end parameter representing how much The slot width is an end-to-end parameter representing how much
frequency resource is requested for a flexi-grid LSP. It is the frequency resource is requested for a flexi-grid LSP. It is the
equivalent of optical bandwidth, although the amount of bandwidth equivalent of optical bandwidth, although the amount of bandwidth
associated with a slot width will depend on the signal encoding. associated with a slot width will depend on the signal encoding.
Different LSPs may request different amounts of frequency resource Different LSPs may request different amounts of frequency resource
in flexible grid networks, so the slot width needs to be carried in in flexible grid networks, so the slot width MUST be carried in the
the signaling message during LSP establishment. This enables the signaling message during LSP establishment. This enables the nodes
nodes along the LSP to know how much frequency resource has been along the LSP to know how much frequency resource has been requested
requested (in a Path message) and has been allocated (by a Resv (in a Path message) and has been allocated (by a Resv message) for
message) for the LSP. the LSP.
3.2. Frequency Slot 3.2. Frequency Slot
The frequency slot information identifies which part of the The frequency slot information identifies which part of the
frequency spectrum is allocated on each link for an LSP in a flexi- frequency spectrum is allocated on each link for an LSP in a flexi-
grid network. grid network.
This information is required in a Resv message to indicate, hop-by- This information MUST be present in a Resv message to indicate, hop-
hop, the central frequency of the allocated resource. In combination by-hop, the central frequency of the allocated resource. In
with the slot width indicated in a Resv message (see Section 3.1) combination with the slot width indicated in a Resv message (see
the central frequency carried in a Resv message identifies the Section 3.1) the central frequency carried in a Resv message
resources reserved for the LSP (known as the frequency slot). identifies the resources reserved for the LSP (known as the
frequency slot).
The frequency slot can be represented by the two parameters as The frequency slot can be represented by the two parameters as
follows: follows:
Frequency slot = [(central frequency) - (slot width)/2] ~ Frequency slot = [(central frequency) - (slot width)/2] ~
[(central frequency) + (slot width)/2] [(central frequency) + (slot width)/2]
As is common with other resource identifiers (i.e., labels) in GMPLS As is common with other resource identifiers (i.e., labels) in GMPLS
signaling, it must be possible for the head-end LSP when sending a signaling, it must be possible for the head-end LSP when sending a
Path message to suggest or require the central frequency to be used Path message to suggest or require the central frequency to be used
for the LSP. Furthermore, for bidirectional LSPs, the Path message for the LSP. Furthermore, for bidirectional LSPs, the Path message
must be able to specify the central frequency to be used for reverse MUST be able to specify the central frequency to be used for reverse
direction traffic. direction traffic.
As described in [G.694.1], the allowed frequency slots for the As described in [G.694.1], the allowed frequency slots for the
flexible DWDM grid have a nominal central frequency (in THz) defined flexible DWDM grid have a nominal central frequency (in THz) defined
by: by:
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.
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traffic parameters for a flexi-grid LSP encode the slot width. traffic parameters for a flexi-grid LSP encode the slot width.
This document defines new C-Types for the SENDER_TSPEC and FLOWSPEC This document defines new C-Types for the SENDER_TSPEC and FLOWSPEC
objects to carry Spectrum Switched Optical Network (SSON) traffic objects to carry Spectrum Switched Optical Network (SSON) traffic
parameters: parameters:
SSON SENDER_TSPEC: Class = 12, C-Type = TBD1. SSON SENDER_TSPEC: Class = 12, C-Type = TBD1.
SSON FLOWSPEC: Class = 9, C-Type = TBD2. SSON FLOWSPEC: Class = 9, C-Type = TBD2.
The SSON traffic parameters carried in both objects have the same The SSON traffic parameters carried in both objects MUST have the
format as shown in Figure 1. same format as shown in Figure 1.
0 1 2 3 0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| m | Reserved | | m | Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 1: The SSON Traffic Parameters Figure 1: The SSON Traffic Parameters
m (16 bits): the slot width is specified by m*12.5 GHz. m (16 bits): the slot width is specified by m*12.5 GHz.
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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'', As described in Section 4.3 of [FLEX-LBL], a "compound label",
constructed from a concatenation of the flexi-grid LABELs, is used constructed from a concatenation of the flexi-grid LABELs, is used
when signaling an LSP that uses multiple flexi-grid slots. 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 Sections 4.1 and 4.2 are used. The signaling formats described in Sections 4.1 and 4.2 are used. The signaling
procedures for distributed SA and centralized SA can be applied. procedures for distributed SA and centralized SA can be applied.
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10.1. Normative References 10.1. Normative References
[RFC2119] S. Bradner, "Key words for use in RFCs to indicate [RFC2119] S. Bradner, "Key words for use in RFCs to indicate
requirements levels", RFC 2119, March 1997. requirements levels", RFC 2119, March 1997.
[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-ietf-ccamp-flexigrid-lambda- Switching Routers", draft-ietf-ccamp-flexigrid-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.
[RFC6163] Y. Lee, G. Bernstein and W. Imajuku, "Framework for GMPLS [RFC6163] Y. Lee, G. Bernstein and W. Imajuku, "Framework for GMPLS
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-ietf-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' Addresses 11. Contributors' Addresses
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