CCAMP G.M. Martinelli, Ed.
Internet-Draft M.K. Kattan
Intended status: Standards Track G.M.G. Galimberti
Expires: October 13, 2013 Cisco
A. Z. Zanardi, Ed.
CREATE-NET
April 11, 2013

Encoding for WSON Information Model with Impairments Validation.
draft-martinelli-ccamp-wson-iv-encode-01

Abstract

This document defines proper encoding for the Information Model to support Impairment-Aware (IA) Routing and Wavelength Assignment (RWA) function. This operation might be required in Wavelength Switched Optical Networks (WSON) that already support RWA, encoding defined here goes in addition to available 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 must be reused 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 working documents as Internet-Drafts. The list of current Internet-Drafts is at http://datatracker.ietf.org/drafts/current/.

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This Internet-Draft will expire on October 13, 2013.

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Table of Contents

1. Introduction

In case of WSON where optical impairments plays a significant role, the framework document [RFC6566] defines related control plane architectural options for an Impairment Aware routing and wavelength assignment (IA-RWA). This document provides a suitable encoding for the related WSON Impairment Information Model defined [I-D.martinelli-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

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|        Reserved             |  ParamSource  |    ParamID    |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                            Value                              |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                           Variance                            |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

The following flags are defined:

With the flag S=1 the following parameters are defined:

2.2. Impairment Vector

This sub-TLV is a list of optical parameters and they MAY be grouped by wavelength dependency. To This purpose an optional Label Set sub-TLV is added as a first sub-TLV.

 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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|W|       Reserved              |            Length             |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                         Label Set                             |
:                                                               :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                  Optical Param sub-TLV(s)                     |
:                                                               |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Where:

2.3. Impairment Matrix

As defined by the [I-D.martinelli-ccamp-wson-iv-info] the Impairment Matrix follow 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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Connectivity  |   MatrixID    |             Reserved      |W|N|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                         Link Set A #1                         |
:                               :                               :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                         Link Set B #1                         |
:                               :                               :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                Impairment Vector sub-TLV(s)                   |
:                               :                               :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|       Additional Link Set pairs and Optical Parameters        |
:                               :                               :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

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 subset of parameters apply to the whole node connectivity, a unique matrix with flag N=1 is used. At the same some other subset of parameters apply only to some LinkSet pairs, a specific Impairment Matrix will be added.

3. Acknowledgements

TBD

4. IANA Considerations

This document does not contain any IANA request.

5. Security Considerations

All drafts are required to have a security considerations section. See RFC 3552 [RFC3552] for a guide.

6. References

6.1. Normative References

[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997.
[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.

6.2. Informative References

[RFC3552] Rescorla, E. and B. Korver, "Guidelines for Writing RFC Text on Security Considerations", BCP 72, RFC 3552, July 2003.
[I-D.narten-iana-considerations-rfc2434bis] Narten, T. and H. Alvestrand, "Guidelines for Writing an IANA Considerations Section in RFCs", Internet-Draft draft-narten-iana-considerations-rfc2434bis-09, March 2008.
[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, March 2012.
[I-D.ietf-ccamp-rwa-info] Lee, Y., Bernstein, G., Li, D. and W. Imajuku, "Routing and Wavelength Assignment Information Model for Wavelength Switched Optical Networks", Internet-Draft draft-ietf-ccamp-rwa-info-14, March 2012.
[I-D.ietf-ccamp-general-constraint-encode] Bernstein, G., Lee, Y., Li, D. and W. Imajuku, "General Network Element Constraint Encoding for GMPLS Controlled Networks", Internet-Draft draft-ietf-ccamp-general-constraint-encode-08, July 2012.
[I-D.martinelli-ccamp-wson-iv-info] Martinelli, G., Kattan, M., Galimberti, G. and A. Zanardi, "Information Model for Wavelength Switched Optical Networks (WSON) with Optical Impairments Validation.", Internet-Draft draft-martinelli-ccamp-wson-iv-info-00, July 2012.

Authors' Addresses

Giovanni Martinelli (editor) Cisco via Philips 12 Monza, 20900 Italy Phone: +39 039 2092044 EMail: giomarti@cisco.com
Moustafa Kattan Cisco DUBAI, 500321 UNITED ARAB EMIRATES EMail: mkattan@cisco.com
Gabriele M. Galimberti Cisco Via Philips,12 Monza, 20900 Italy Phone: +39 039 2091462 EMail: ggalimbe@cisco.com
Andrea Zanardi (editor) CREATE-NET via alla Cascata 56 C, Povo Trento, 38100 Italy EMail: andrea.zanardi@create-net.org