draft-ietf-ccamp-wson-iv-info-03.txt   draft-ietf-ccamp-wson-iv-info-04.txt 
CCAMP G. Martinelli, Ed. CCAMP G. Martinelli, Ed.
Internet-Draft Cisco Internet-Draft Cisco
Intended status: Informational X. Zhang, Ed. Intended status: Informational X. Zhang, Ed.
Expires: April 27, 2017 Huawei Technologies Expires: September 14, 2017 Huawei Technologies
G. Galimberti G. Galimberti
Cisco Cisco
A. Zanardi A. Zanardi
D. Siracusa D. Siracusa
F. Pederzolli F. Pederzolli
CREATE-NET CREATE-NET
Y. Lee Y. Lee
F. Zhang F. Zhang
Huawei Technologies Huawei Technologies
October 24, 2016 March 13, 2017
Information Model for Wavelength Switched Optical Networks (WSONs) with Information Model for Wavelength Switched Optical Networks (WSONs) with
Impairments Validation Impairments Validation
draft-ietf-ccamp-wson-iv-info-03 draft-ietf-ccamp-wson-iv-info-04
Abstract Abstract
This document defines an information model to support Impairment- This document defines an information model to support Impairment-
Aware (IA) Routing and Wavelength Assignment (RWA) functionality. Aware (IA) Routing and Wavelength Assignment (RWA) functionality.
This information model extends the information model for impairment- This information model extends the information model for impairment-
free RWA process in WSON to facilitate computation of paths where free RWA process in WSON to facilitate computation of paths where
optical impairment constraints need to considered. optical impairment constraints need to considered.
Status of This Memo Status of This Memo
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Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet- working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current/. Drafts is at http://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress." material or to cite them other than as "work in progress."
This Internet-Draft will expire on April 27, 2017. This Internet-Draft will expire on September 14, 2017.
Copyright Notice Copyright Notice
Copyright (c) 2016 IETF Trust and the persons identified as the Copyright (c) 2017 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
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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 respect carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as the Trust Legal Provisions and are provided without warranty as
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7.2. IV-Distributed . . . . . . . . . . . . . . . . . . . . . 15 7.2. IV-Distributed . . . . . . . . . . . . . . . . . . . . . 15
8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 15 8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 15
9. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 15 9. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 15
10. Security Considerations . . . . . . . . . . . . . . . . . . . 15 10. Security Considerations . . . . . . . . . . . . . . . . . . . 15
11. References . . . . . . . . . . . . . . . . . . . . . . . . . 15 11. References . . . . . . . . . . . . . . . . . . . . . . . . . 15
11.1. Normative References . . . . . . . . . . . . . . . . . . 15 11.1. Normative References . . . . . . . . . . . . . . . . . . 15
11.2. Informative References . . . . . . . . . . . . . . . . . 16 11.2. Informative References . . . . . . . . . . . . . . . . . 16
Appendix A. FAQ . . . . . . . . . . . . . . . . . . . . . . . . 17 Appendix A. FAQ . . . . . . . . . . . . . . . . . . . . . . . . 17
A.1. Why the Application Code does not suffice for Optical A.1. Why the Application Code does not suffice for Optical
Impairment Validation? . . . . . . . . . . . . . . . . . 17 Impairment Validation? . . . . . . . . . . . . . . . . . 17
A.2. Are DWDM network multivendor? . . . . . . . . . . . . . . 17 A.2. Are DWDM network multivendor? . . . . . . . . . . . . . . 18
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 18 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 18
1. Introduction 1. Introduction
In the context of Wavelength Switched Optical Network (WSON), In the context of Wavelength Switched Optical Network (WSON),
[RFC6163] describes the basic framework for a GMPLS and PCE-based [RFC6163] describes the basic framework for a GMPLS and PCE-based
Routing and Wavelength Assignment (RWA) control plane. The Routing and Wavelength Assignment (RWA) control plane. The
associated information model [RFC7446] defines information/parameters associated information model [RFC7446] defines information/parameters
required by an RWA process without optical impairment considerations. required by an RWA process without optical impairment considerations.
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plane can deal with a specific impairment parameter, depending on plane can deal with a specific impairment parameter, depending on
architectural options chosen within the overall impairment framework architectural options chosen within the overall impairment framework
[RFC6566]. In some case, properties value will help to identify the [RFC6566]. In some case, properties value will help to identify the
level of approximation supported by the IV process. level of approximation supported by the IV process.
o Time Dependency o Time Dependency
This identifies how an impairment parameter may vary with time. This identifies how an impairment parameter may vary with time.
There could be cases where there is no time dependency, while in There could be cases where there is no time dependency, while in
other cases there may be need of re-evaluation after a certain other cases there may be need of re-evaluation after a certain
time. In this category, variations in impairments due to time. In this category, variations in impairments due to
environmental factors such as those discussed in [G.sup47] are environmental factors such as those discussed in [ITU.GSUP47] are
considered. In some cases, an impairment parameter that has time considered. In some cases, an impairment parameter that has time
dependency may be considered as a constant for approximation. In dependency may be considered as a constant for approximation. In
this information model, we do neglect this property. this information model, we do neglect this property.
o Wavelength Dependency o Wavelength Dependency
This property identifies if an impairment parameter can be This property identifies if an impairment parameter can be
considered as constant over all the wavelength spectrum of considered as constant over all the wavelength spectrum of
interest or not. Also in this case a detailed impairment interest or not. Also in this case a detailed impairment
evaluation might lead to consider the exact value while an evaluation might lead to consider the exact value while an
approximation IV might take a constant value for all wavelengths. approximation IV might take a constant value for all wavelengths.
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element)". Already in G-2 above. element)". Already in G-2 above.
L-7 "Channel local chromatic dispersion (for a fibre segment)". L-7 "Channel local chromatic dispersion (for a fibre segment)".
Already in G-2 above (since consider both local and fiber Already in G-2 above (since consider both local and fiber
dispersions). dispersions).
L-8 "Differential group delay (for a network element)", [ITU.G671]. L-8 "Differential group delay (for a network element)", [ITU.G671].
Required by G-3. Required by G-3.
L-9 "Polarisation mode dispersion (for a fibre segment)", L-9 "Polarisation mode dispersion (for a fibre segment)",
[ITU.G650.2, ITU.G680]. Defined above as G-3. [ITU.G650.2], [ITU.G680]. Defined above as G-3.
L-10 "Polarization dependent loss (for a network element)", L-10 "Polarization dependent loss (for a network element)",
[ITU.G671] and [ITU.G680]. Defined above as G-4. [ITU.G671] and [ITU.G680]. Defined above as G-4.
L-11 "Reflectance". From [ITU.G671] Section 3.2.2.37 is the ratio L-11 "Reflectance". From [ITU.G671] Section 3.2.2.37 is the ratio
of reflected power Pr to incident power Pi at a given port of a of reflected power Pr to incident power Pi at a given port of a
passive component, for given conditions of spectral passive component, for given conditions of spectral
composition, polarization and geometrical distribution. composition, polarization and geometrical distribution.
Generally expressed in dB. Might be monitored in some critical Generally expressed in dB. Might be monitored in some critical
cases. We neglect this effect as first approximation. cases. We neglect this effect as first approximation.
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11. References 11. References
11.1. Normative References 11.1. Normative References
[ITU.G650.1] [ITU.G650.1]
International Telecommunications Union, "Transmission International Telecommunications Union, "Transmission
media and optical systems characteristics - Optical fibre media and optical systems characteristics - Optical fibre
cable", ITU-T Recommendation G.650.1, July 2010. cable", ITU-T Recommendation G.650.1, July 2010.
[ITU.G650.2]
International Telecommunications Union, "Definitions and
test methods for statistical and non-linear related
attributes of single-mode fibre and cable",
ITU-T Recommendation G.650.2, August 2015.
[ITU.G671] [ITU.G671]
International Telecommunications Union, "Transmission International Telecommunications Union, "Transmission
characteristics of optical components and subsystems", characteristics of optical components and subsystems",
ITU-T Recommendation G.671, February 2012. ITU-T Recommendation G.671, February 2012.
[ITU.G680] [ITU.G680]
International Telecommunications Union, "Physical transfer International Telecommunications Union, "Physical transfer
functions of optical network elements", functions of optical network elements",
ITU-T Recommendation G.680, July 2007. ITU-T Recommendation G.680, July 2007.
[ITU.G697] [ITU.G697]
International Telecommunications Union, "Optical International Telecommunications Union, "Optical
monitoring for dense wavelength division multiplexing monitoring for dense wavelength division multiplexing
systems", ITU-T Recommendation G.697, February 2012. systems", ITU-T Recommendation G.697, February 2012.
[ITU.GSUP39] [ITU.GSUP39]
International Telecommunications Union, "Optical System International Telecommunications Union, "Optical System
Design and Engineering Considerations", Design and Engineering Considerations",
ITU-T Recommendation G. Supplement 39, September 2012. ITU-T Recommendation G. Supplement 39, September 2012.
[ITU.GSUP47]
International Telecommunications Union, "General aspects
of optical fibres and cables", ITU-T Recommendation G.
Supplement 47, September 2012.
11.2. Informative References 11.2. Informative References
[I-D.martinelli-ccamp-wson-iv-encode] [I-D.martinelli-ccamp-wson-iv-encode]
Martinelli, G., Zhang, X., Galimberti, G., Siracusa, D., Martinelli, G., Zhang, X., Galimberti, G., Siracusa, D.,
Zanardi, A., Pederzolli, F., Lee, Y., and F. Zhang, Zanardi, A., Pederzolli, F., Lee, Y., and F. Zhang,
"Information Encoding for WSON with Impairments "Information Encoding for WSON with Impairments
Validation", draft-martinelli-ccamp-wson-iv-encode-06 Validation", draft-martinelli-ccamp-wson-iv-encode-07
(work in progress), October 2015. (work in progress), October 2016.
[LS78] International Telecommunications Union SG15/Q6, "LS/s on [LS78] International Telecommunications Union SG15/Q6, "LS/s on
CCAMP Liaison to ITU-T SG15 Q6 and Q12 on WSON", CCAMP Liaison to ITU-T SG15 Q6 and Q12 on WSON",
LS https://datatracker.ietf.org/liaison/1288/, October LS https://datatracker.ietf.org/liaison/1288/, October
2013. 2013.
[RFC6163] Lee, Y., Ed., Bernstein, G., Ed., and W. Imajuku, [RFC6163] Lee, Y., Ed., Bernstein, G., Ed., and W. Imajuku,
"Framework for GMPLS and Path Computation Element (PCE) "Framework for GMPLS and Path Computation Element (PCE)
Control of Wavelength Switched Optical Networks (WSONs)", Control of Wavelength Switched Optical Networks (WSONs)",
RFC 6163, DOI 10.17487/RFC6163, April 2011, RFC 6163, DOI 10.17487/RFC6163, April 2011,
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