Internet DRAFT - draft-ietf-ccamp-wson-iv-encode
draft-ietf-ccamp-wson-iv-encode
CCAMP G. Martinelli, Ed.
Internet-Draft Cisco
Intended status: Standards Track Y. Lee, Ed.
Expires: July 5, 2019 Huawei Technologies
G. Galimberti
Cisco
F. Zhang
Huawei Technologies
January 4, 2019
Information Encoding for WSON with Impairments Validation
draft-ietf-ccamp-wson-iv-encode-02
Abstract
Impairment-Aware (IA) Routing and Wavelength Assignment (RWA)
function might be required in Wavelength Switched Optical Networks
(WSON) that already support RWA. This document defines proper
encoding to support this operation. It goes in addition to the
available impairment-free WSON encoding and it is fully compatible
with it.
As the information model, the encoding is independent from control
plane architectures and protocol implementations. Its definitions
can be used in related protocol extensions.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
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material or to cite them other than as "work in progress."
This Internet-Draft will expire on July 5, 2019.
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Copyright Notice
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Requirements Language . . . . . . . . . . . . . . . . . . 3
2. Encoding . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1. Optical Parameter . . . . . . . . . . . . . . . . . . . . 3
2.2. Impairment Vector . . . . . . . . . . . . . . . . . . . . 5
2.3. Connectivity Matrix Field for Impairment . . . . . . . . 6
2.4. Resource Block Information . . . . . . . . . . . . . . . 8
3. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 8
4. Contributing Authors . . . . . . . . . . . . . . . . . . . . 9
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 9
6. Security Considerations . . . . . . . . . . . . . . . . . . . 9
7. References . . . . . . . . . . . . . . . . . . . . . . . . . 10
7.1. Normative References . . . . . . . . . . . . . . . . . . 10
7.2. Informative References . . . . . . . . . . . . . . . . . 10
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 11
1. Introduction
In case of WSON where optical impairments play a significant role,
the framework document [RFC6566] defines related control plane
architectural options for Impairment Aware Routing and Wavelength
Assignment (IA-RWA). This document provides a suitable encoding for
the related WSON impairment information model as defined
[I-D.ietf-ccamp-wson-iv-info].
This document directly refers to ITU recommendations [ITU.G680] and
[ITU.G697] as already detailed in the information model.
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1.1. 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 RFC 2119 [RFC2119].
2. Encoding
This section details encoding for all elements defined within
[I-D.ietf-ccamp-wson-iv-info]. Elements to encode are:
Optical Parameter (OPTICAL_PARAM)
Optical Impairment Vector (OIV)
Impairment Matrix
Impairment Resource Block Information
2.1. Optical Parameter
The OPTICAL_PARAM is defined as a sub-TLV object.
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|S|V| Reserved | ParamSource | ParamID |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Value |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Variance (Optional) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The following flag is defined:
S: Standard bit.
S=1 identifies a set of parameters standardized by ITU; while
S=0 identifies a non-standardized set of parameters.
V: Variance bit.
V=0 only parameter value, V=1 parameter value and variance.
With the flag S=1 the following parameters are defined:
ParamSource = 1.
Identify the ITU document that defines the following parameter
list. Currently [ITU.G697] defines this value 1 for this
parameter.
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ParamID.
Parameter identifier according to the source. [ITU.G697] table
V.3 defines the following identifiers:
1. Total Power (dBm)
Not reported within [I-D.ietf-ccamp-wson-iv-info] parameter
list but relates to Channel Power through the number of
channels.
2. Channel Power (dBm).
Referred as parameter L-3 in [I-D.ietf-ccamp-wson-iv-info]
3. Reserved ("Frequency Deviation from Nominal, GHz", defined
in [ITU.G697] but not used)
4. Reserved ("Wavelength Deviation from Nominal, nm", defined
in [ITU.G697] but not used)
5. OSNR (db).
Referred as parameter G-1 in [I-D.ietf-ccamp-wson-iv-info]
6. Reserved. (Q Factor, a pure number).
Not reported within [I-D.ietf-ccamp-wson-iv-info] parameter
list but is a known index for assessing channel quality.
7. PMD (ps).
Referred as parameter G-3 in [I-D.ietf-ccamp-wson-iv-info]
8. Residual Chromatic Dispersion (ps/nm).
Referred as parameter G-2 in [I-D.ietf-ccamp-wson-iv-info]
Value.
Value for the parameter. As defined by [ITU.G697], it is a 32
bit IEEE floating point number.
Variance.
Variance for the parameter, a 32 bit IEEE floating point
number.
According to [I-D.ietf-ccamp-wson-iv-info], there are some parameters
required for the IV function not listed within [ITU.G697]. Current
information source for such parameters is [LS78] hence, this document
proposes to use a different value for the field parameter source.
ParamSource = 0 (proposal).
List of parameters within [I-D.ietf-ccamp-wson-iv-info].
ParamID.
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A number that take the following list of values.
1. Ripple (dBm). L-4 in [I-D.ietf-ccamp-wson-iv-info].
2. Channel signal-spontaneous noise figure. L-5 in
[I-D.ietf-ccamp-wson-iv-info].
3. DGD, Differential Group Delay. L-8 in
[I-D.ietf-ccamp-wson-iv-info].
4. Reflectance. L-11 in [I-D.ietf-ccamp-wson-iv-info].
5. Isolation. L-12 in [I-D.ietf-ccamp-wson-iv-info].
6. Channel extinction. L-13 in [I-D.ietf-ccamp-wson-iv-info].
7. Attenuation Coefficient. L-14 in
[I-D.ietf-ccamp-wson-iv-info].
2.2. Impairment Vector
This sub-TLV is a list of optical parameters and they MAY have a
wavelength dependency information.
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| Reserved | Number of Parameters |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Optical Param sub-TLV(s) |
: |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Where:
W = 0. Wavelength Dependency flag. There is no wavelength
dependency.
Number of Parameters contained in this vector.
Optical Param sub-TLV(s) present a list of Object as defined in
Section 2.1.
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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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|1| Reserved | Number of Parameters |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Label Set |
: :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Optical Param sub-TLV(s) |
: |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Where:
W = 1. Wavelength Dependency flag. There is wavelength
dependency.
The Label Set object is defined in [RFC7579] Section 2.6. Likely
an inclusive range will be the only option required by the Action
defined in the Label Set.
2.3. Connectivity Matrix Field for Impairment
As defined by the [I-D.ietf-ccamp-wson-iv-info], the impairment
matrix follows the same structure as the connectivity matrix. The
encoding of the connectivity matrix for impairment is enhanced from
the Connectivity Matrix Field as defined in Section 2.1 of [RFC7579].
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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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Conn | MatrixID | Reserved |N|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link Set A #1 |
: : :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link Set B #1 |
: : :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Impairment Vector sub-TLV(s) |
: : :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Additional Link Set pairs and Impairment Vector(s) |
: : :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Conn | MatrixID | Reserved |N|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Impairment Vector sub-TLV(s) |
: : :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Where:
Connectivity (Conn) (4 bits) has value 2 for the impairment matrix
(Values 0 and 1 defined by [RFC7579]).
MatrixID: matrix identifier,following same rules as [RFC7579].
N: Node scope flag. With this flag set (N=0), there's no Link Set
information but only a list of optical parameters TLVs that apply
to the whole optical node.
The usage of multiple matrixes with connectivity type equal to 2
(Impairment Matrix) MIGHT be used to group optical parameters by
connectivity. For example, if a subset of parameters apply to the
whole node, a unique matrix with flag N=1 is used. At the same some
another subset of parameters applies only to some LinkSet pairs, a
specific Impairment Matrix will be added.
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2.4. Resource Block Information
The Resource Block Information field is used to represent resource
signal constraints and processing capabilities of a node. As defined
by [I-D.ietf-ccamp-wson-iv-info], the concept of resource block is
extended to support the description of the impairments related to
that block. The encoding expands the same structure as the one
defined in Section 4 of [RFC7581], with the addition of an optional
Impairment Vector sub-object:
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| RB Set Field |
: :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|I|O|B| Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Optical Interface Class List(s) (opt) |
: :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Acceptable Client Signal Type (opt) |
: :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Input Bit Rate List (opt) |
: :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Processing Capabilities List (opt) |
: :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| OIV-Impairment Vector (opt) |
: :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The Impairment Vector is defined within Section 2.2. All the other
fields are defined within [RFC7581].
3. Acknowledgements
Authors would like to acknowledge Greg Bernstein and Moustafa Kattan
as authors of a previous similar draft whose content partially
converged here.
Authors would like to thank ITU SG15/Q6 and in particular Peter
Stassar and Pete Anslow for providing useful information and text to
CCAMP through join meetings and liaisons.
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4. Contributing Authors
This document was the collective work of several authors. The text
and content of this document was contributed by the editors, authors
and the co-authors listed below (the contact information for the
editors appears in appropriate section and is not repeated below):
Domenico Siracusa
CREATE-NET
via alla Cascata 56/D, Povo
Trento 38123
Italy
Email: domenico.siracusa@create-net.org
Andrea Zanardi
CREATE-NET
via alla Cascata 56/D, Povo
Trento 38123
Italy
Email: andrea.zanardi@create-net.org
Federico Pederzolli
CREATE-NET
via alla Cascata 56/D, Povo
Trento 38123
Italy
Email: federico.perderzolli@create-net.org
5. IANA Considerations
This document does not contain any IANA request.
6. Security Considerations
This document defines an protocol-neutral encoding for an information
model describing impairments in optical networks and it does not
introduce any security issues. If such a encoding is put into use
within a network it will by its nature contain details of the
physical characteristics of an optical network. Such information
would need to be protected from intentional or unintentional
disclosure.
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7. References
7.1. Normative References
[ITU.G680]
International Telecommunications Union, "Physical transfer
functions of optical network elements",
ITU-T Recommendation G.680, July 2007.
[ITU.G697]
International Telecommunications Union, "Optical
monitoring for dense wavelength division multiplexing
systems", ITU-T Recommendation G.697, February 2012.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997,
<https://www.rfc-editor.org/info/rfc2119>.
7.2. Informative References
[I-D.ietf-ccamp-wson-iv-info]
Martinelli, G., Zhang, X., Galimberti, G., Zanardi, A.,
Siracusa, D., Pederzolli, F., Lee, Y., and F. Zhang,
"Information Model for Wavelength Switched Optical
Networks (WSONs) with Impairments Validation", draft-ietf-
ccamp-wson-iv-info-05 (work in progress), July 2017.
[LS78] International Telecommunications Union SG15/Q6, "LS/s on
CCAMP Liaison to ITU-T SG15 Q6 and Q12 on WSON",
LS https://datatracker.ietf.org/liaison/1288/, October
2013.
[RFC6566] Lee, Y., Ed., Bernstein, G., Ed., Li, D., and G.
Martinelli, "A Framework for the Control of Wavelength
Switched Optical Networks (WSONs) with Impairments",
RFC 6566, DOI 10.17487/RFC6566, March 2012,
<https://www.rfc-editor.org/info/rfc6566>.
[RFC7579] Bernstein, G., Ed., Lee, Y., Ed., Li, D., Imajuku, W., and
J. Han, "General Network Element Constraint Encoding for
GMPLS-Controlled Networks", RFC 7579,
DOI 10.17487/RFC7579, June 2015,
<https://www.rfc-editor.org/info/rfc7579>.
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[RFC7581] Bernstein, G., Ed., Lee, Y., Ed., Li, D., Imajuku, W., and
J. Han, "Routing and Wavelength Assignment Information
Encoding for Wavelength Switched Optical Networks",
RFC 7581, DOI 10.17487/RFC7581, June 2015,
<https://www.rfc-editor.org/info/rfc7581>.
Authors' Addresses
Giovanni Martinelli (editor)
Cisco
via Santa Maria Molgora 48/C
Vimercate, MB 20871
Italy
Phone: +39 039 2092044
Email: giomarti@cisco.com
Young Lee (editor)
Huawei Technologies
5340 Legacy Drive
Plano, TX 75023
U.S.A
Email: leeyoung@huawei.com
Gabriele M. Galimberti
Cisco
Via Santa Maria Molgora 48/C
Vimercate, MB 20871
Italy
Phone: +39 039 2091462
Email: ggalimbe@cisco.com
Fatai Zhang
Huawei Technologies
F3-5-B R&D Center, Huawei Base
Bantian, Longgang District
Shenzen 518129
P.R. China
Email: zhang.fatai@huawei.com
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