CCAMP G. Martinelli, Ed.
Internet-Draft Cisco
Intended status: Standards Track X. Zhang, Ed.
Expires: April 20, 2016 Huawei Technologies
G. Galimberti
Cisco
D. Siracusa
A. Zanardi
F. Pederzolli
CREATE-NET
Y. Lee
F. Zhang
Huawei Technologies
October 18, 2015

Information Encoding for WSON with Impairments Validation
draft-martinelli-ccamp-wson-iv-encode-06

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.

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Table of Contents

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.

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:

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 indentifies 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.
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]. [Editor Note: Value to be confirmed through ITU Liaison].
ParamID.

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 extintion. 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:

 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:

2.3. Impairment Matrix

As defined by the [I-D.ietf-ccamp-wson-iv-info], the impairment matrix follows the same structure as the connectivity matrix.

 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              |0|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                         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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Conne |    MatrixID   |                Reserved             |1|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                Impairment Vector sub-TLV(s)                   |
:                               :                               :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Where:

The usage of multiple matrixes with connectivity type equal to 2 (Impairment Matrix) MIGHT be used to grup 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.

2.4. Resource Block Information

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 follows the same structure as the one defined in [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|                         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 acknoledge 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.

4. IANA Considerations

This document does not contain any IANA request.

5. 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.

6. References

6.1. 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.

6.2. 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", Internet-Draft draft-ietf-ccamp-wson-iv-info-01, March 2015.
[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., Bernstein, G., 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.
[RFC7579] Bernstein, G., Lee, Y., Li, D., Imajuku, W. and J. Han, "General Network Element Constraint Encoding for GMPLS-Controlled Networks", RFC 7579, DOI 10.17487/RFC7579, June 2015.
[RFC7581] Bernstein, G., Lee, Y., 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.

Authors' Addresses

Giovanni Martinelli (editor) Cisco via Philips 12 Monza, 20900 Italy Phone: +39 039 2092044 EMail: giomarti@cisco.com
Xian Zhang (editor) Huawei Technologies F3-5-B R&D Center, Huawei Base Bantian, Longgang District Shenzen, 518129 P.R. China Phone: +86 755 28972913 EMail: zhang.xian@huawei.com
Gabriele M. Galimberti Cisco Via Philips,12 Monza, 20900 Italy Phone: +39 039 2091462 EMail: ggalimbe@cisco.com
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.perdezolli@create-net.org
Young Lee Huawei Technologies 1700 Alma Drive, Suite 100 Plano, TX 75075 U.S.A EMail: ylee@huawei.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