draft-ietf-ccamp-wson-impairments-09.txt   draft-ietf-ccamp-wson-impairments-10.txt 
Network Working Group Y. Lee Network Working Group Y. Lee
Huawei Huawei
G. Bernstein G. Bernstein
Grotto Networking Grotto Networking
D. Li D. Li
Huawei Huawei
G. Martinelli G. Martinelli
Cisco Cisco
Internet Draft Internet Draft
Intended status: Informational January 4, 2012 Intended status: Informational January 5, 2012
Expires: July 2012 Expires: July 2012
A Framework for the Control of Wavelength Switched Optical Networks A Framework for the Control of Wavelength Switched Optical Networks
(WSON) with Impairments (WSON) with Impairments
draft-ietf-ccamp-wson-impairments-09.txt draft-ietf-ccamp-wson-impairments-10.txt
Abstract Abstract
As an optical signal progresses along its path, it may be altered by As an optical signal progresses along its path, it may be altered by
the various physical processes in the optical fibers and devices it the various physical processes in the optical fibers and devices it
encounters. When such alterations result in signal degradation, encounters. When such alterations result in signal degradation,
these processes are usually referred to as "impairments". These these processes are usually referred to as "impairments". These
physical characteristics may be important constraints to consider physical characteristics may be important constraints to consider
when using a GMPLS control plane to support path setup and when using a GMPLS control plane to support path setup and
maintenance in wavelength switched optical networks. maintenance in wavelength switched optical networks.
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months and may be updated, replaced, or obsoleted by other documents months and may be updated, replaced, or obsoleted by other documents
at any time. It is inappropriate to use Internet-Drafts as at any time. It is inappropriate to use Internet-Drafts as
reference material or to cite them other than as "work in progress." reference material or to cite them other than as "work in progress."
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This Internet-Draft will expire on July 4, 2012. This Internet-Draft will expire on July 5, 2012.
Copyright Notice Copyright Notice
Copyright (c) 2012 IETF Trust and the persons identified as the Copyright (c) 2012 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
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Table of Contents Table of Contents
1. Introduction...................................................3 1. Introduction...................................................3
2. Terminology....................................................4 2. Terminology....................................................4
3. Applicability..................................................6 3. Applicability..................................................6
4. Impairment Aware Optical Path Computation......................7 4. Impairment Aware Optical Path Computation......................7
4.1. Optical Network Requirements and Constraints..............8 4.1. Optical Network Requirements and Constraints..............8
4.1.1. Impairment Aware Computation Scenarios...............8 4.1.1. Impairment Aware Computation Scenarios...............8
4.1.2. Impairment Computation and Information Sharing 4.1.2. Impairment Computation and Information Sharing
Constraints.................................................9 Constraints.................................................9
In all the above cases it would be the responsibility of the
authority in control of the "black links" to import the shared
impairment information from the other NEs via the control
plane or other means as necessary..........................11
4.1.3. Impairment Estimation Process.......................11 4.1.3. Impairment Estimation Process.......................11
4.2. IA-RWA Computation and Control Plane Architectures.......12 4.2. IA-RWA Computation and Control Plane Architectures.......12
4.2.1. Combined Routing, WA, and IV........................14 4.2.1. Combined Routing, WA, and IV........................14
4.2.2. Separate Routing, WA, or IV.........................14 4.2.2. Separate Routing, WA, or IV.........................14
4.2.3. Distributed WA and/or IV............................15 4.2.3. Distributed WA and/or IV............................15
4.3. Mapping Network Requirements to Architectures............16 4.3. Mapping Network Requirements to Architectures............16
5. Protocol Implications.........................................18 5. Protocol Implications.........................................18
5.1. Information Model for Impairments........................19 5.1. Information Model for Impairments........................19
5.2. Routing..................................................19 5.2. Routing..................................................20
5.3. Signaling................................................20 5.3. Signaling................................................20
5.4. PCE......................................................20 5.4. PCE......................................................21
5.4.1. Combined IV & RWA...................................20 5.4.1. Combined IV & RWA...................................21
5.4.2. IV-Candidates + RWA.................................21 5.4.2. IV-Candidates + RWA.................................21
5.4.3. Approximate IA-RWA + Separate Detailed IV...........23 5.4.3. Approximate IA-RWA + Separate Detailed IV...........23
6. Manageability and Operations..................................25 6. Manageability and Operations..................................25
7. Security Considerations.......................................25 7. Security Considerations.......................................26
8. IANA Considerations...........................................26 8. IANA Considerations...........................................27
9. References....................................................26 9. References....................................................27
9.1. Normative References.....................................26 9.1. Normative References.....................................27
9.2. Informative References...................................26 9.2. Informative References...................................27
10. Acknowledgments..............................................27 10. Acknowledgments..............................................28
1. Introduction 1. Introduction
Wavelength Switched Optical Networks (WSONs) are constructed from Wavelength Switched Optical Networks (WSONs) are constructed from
subsystems that may include Wavelength Division Multiplexed (WDM) subsystems that may include Wavelength Division Multiplexed (WDM)
links, tunable transmitters and receivers, Reconfigurable Optical links, tunable transmitters and receivers, Reconfigurable Optical
Add/Drop Multiplexers (ROADM), wavelength converters, and electro- Add/Drop Multiplexers (ROADM), wavelength converters, and electro-
optical network elements. A WSON is a wavelength division optical network elements. A WSON is a wavelength division
multiplexed (WDM)-based optical network in which switching is multiplexed (WDM)-based optical network in which switching is
performed selectively based on the center wavelength of an optical performed selectively based on the center wavelength of an optical
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PCE-like entity would not need to perform a full RWA computation, PCE-like entity would not need to perform a full RWA computation,
i.e., it would not need to take into account current wavelength i.e., it would not need to take into account current wavelength
availability on links. Such an approach may require PCEP availability on links. Such an approach may require PCEP
extensions for both the request and response information. extensions for both the request and response information.
3. The authority in control of the "black links" provides a PCE that 3. The authority in control of the "black links" provides a PCE that
performs full IA-RWA services. The difficulty is this requires performs full IA-RWA services. The difficulty is this requires
the one authority to also become the sole source of all RWA the one authority to also become the sole source of all RWA
optimization algorithms. optimization algorithms.
4.1.3. In all the above cases it would be the responsibility of the In all the above cases it would be the responsibility of the
authority in control of the "black links" to import the shared authority in control of the "black links" to import the shared
impairment information from the other NEs via the control plane or impairment information from the other NEs via the control plane or
other means as necessary. Impairment Estimation Process other means as necessary.
4.1.3. Impairment Estimation Process
The Impairment Estimation Process can be modeled through the The Impairment Estimation Process can be modeled through the
following functional blocks. These blocks are independent of any following functional blocks. These blocks are independent of any
Control Plane architecture, that is, they can be implemented by the Control Plane architecture, that is, they can be implemented by the
same or by different control plane functions as detailed in same or by different control plane functions as detailed in
following sections. following sections.
+-----------------+ +-----------------+
+------------+ +-----------+ | +------------+ | +------------+ +-----------+ | +------------+ |
| | | | | | | | | | | | | | | |
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