draft-ietf-ccamp-rwa-wson-framework-01.txt   draft-ietf-ccamp-rwa-wson-framework-02.txt 
Network Working Group Y. Lee (ed.) Network Working Group Y. Lee (ed.)
Internet Draft Huawei Internet Draft Huawei
Intended status: Informational G. Bernstein (ed.) Intended status: Informational G. Bernstein (ed.)
Expires: August 2009 Grotto Networking Expires: September 2009 Grotto Networking
Wataru Imajuku Wataru Imajuku
NTT NTT
February 9, 2009 March 4, 2009
Framework for GMPLS and PCE Control of Wavelength Switched Optical Framework for GMPLS and PCE Control of Wavelength Switched Optical
Networks (WSON) Networks (WSON)
draft-ietf-ccamp-rwa-wson-framework-01.txt draft-ietf-ccamp-rwa-wson-framework-02.txt
Status of this Memo Status of this Memo
This Internet-Draft is submitted to IETF in full conformance with the This Internet-Draft is submitted to IETF in full conformance with the
provisions of BCP 78 and BCP 79. provisions of BCP 78 and BCP 79.
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other groups may also distribute working documents as Internet- other groups may also distribute working documents as Internet-
Drafts. Drafts.
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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."
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This Internet-Draft will expire on August 9, 2009. This Internet-Draft will expire on September 4, 2009.
Copyright Notice Copyright Notice
Copyright (c) 2009 IETF Trust and the persons identified as the Copyright (c) 2009 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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are common across different WSON environments. It is expected that a are common across different WSON environments. It is expected that a
variety of different techniques will be applied to optical variety of different techniques will be applied to optical
impairments depending on the type of WSON, such as access, metro or impairments depending on the type of WSON, such as access, metro or
long haul. long haul.
Table of Contents Table of Contents
1. Introduction...................................................4 1. Introduction...................................................4
1.1. Revision History..........................................5 1.1. Revision History..........................................5
1.1.1. Changes from 00......................................5 1.1.1. Changes from 00......................................5
1.1.2. Changes from 01......................................5
2. Terminology....................................................5 2. Terminology....................................................5
3. Wavelength Switched Optical Networks...........................5 3. Wavelength Switched Optical Networks...........................6
3.1. WDM and CWDM Links........................................6 3.1. WDM and CWDM Links........................................6
3.2. Optical Transmitters......................................8 3.2. Optical Transmitters......................................8
3.2.1. Lasers...............................................8 3.2.1. Lasers...............................................8
3.2.2. Spectral Characteristics & Modulation Type...........9 3.2.2. Spectral Characteristics & Modulation Type...........9
3.2.3. Signal Rates and Error Correction...................10 3.2.3. Signal Rates and Error Correction...................10
3.3. ROADMs, OXCs, Splitters, Combiners and FOADMs............10 3.3. ROADMs, OXCs, Splitters, Combiners and FOADMs............10
3.3.1. Reconfigurable Add/Drop Multiplexers and OXCs.......10 3.3.1. Reconfigurable Add/Drop Multiplexers and OXCs.......11
3.3.2. Splitters...........................................12 3.3.2. Splitters...........................................13
3.3.3. Combiners...........................................13 3.3.3. Combiners...........................................13
3.3.4. Fixed Optical Add/Drop Multiplexers.................13 3.3.4. Fixed Optical Add/Drop Multiplexers.................13
3.4. Wavelength Converters....................................14 3.4. Wavelength Converters....................................14
3.4.1. Wavelength Converter Pool Modeling..................16 3.4.1. Wavelength Converter Pool Modeling..................16
4. Routing and Wavelength Assignment and the Control Plane.......19 4. Routing and Wavelength Assignment and the Control Plane.......20
4.1. Architectural Approaches to RWA..........................20 4.1. Architectural Approaches to RWA..........................21
4.1.1. Combined RWA (R&WA).................................21 4.1.1. Combined RWA (R&WA).................................22
4.1.2. Separated R and WA (R+WA)...........................21 4.1.2. Separated R and WA (R+WA)...........................22
4.1.3. Routing and Distributed WA (R+DWA)..................22 4.1.3. Routing and Distributed WA (R+DWA)..................23
4.2. Conveying information needed by RWA......................22 4.2. Conveying information needed by RWA......................23
4.3. Lightpath Temporal Characteristics.......................23 4.3. Lightpath Temporal Characteristics.......................24
5. Modeling Examples and Control Plane Use Cases.................24 5. Modeling Examples and Control Plane Use Cases.................25
5.1. Network Modeling for GMPLS/PCE Control...................24 5.1. Network Modeling for GMPLS/PCE Control...................25
5.1.1. Describing the WSON nodes...........................25 5.1.1. Describing the WSON nodes...........................26
5.1.2. Describing the links................................27 5.1.2. Describing the links................................28
5.2. RWA Path Computation and Establishment...................28 5.2. RWA Path Computation and Establishment...................29
5.3. Resource Optimization....................................29 5.3. Resource Optimization....................................30
5.4. Support for Rerouting....................................30 5.4. Support for Rerouting....................................31
6. GMPLS & PCE Implications......................................30 6. GMPLS & PCE Implications......................................31
6.1. Implications for GMPLS signaling.........................30 6.1. Implications for GMPLS signaling.........................31
6.1.1. Identifying Wavelengths and Signals.................31 6.1.1. Identifying Wavelengths and Signals.................32
6.1.2. Combined RWA/Separate Routing WA support............31 6.1.2. Combined RWA/Separate Routing WA support............32
6.1.3. Distributed Wavelength Assignment: Unidirectional, No 6.1.3. Distributed Wavelength Assignment: Unidirectional, No
Converters.................................................31 Converters.................................................32
6.1.4. Distributed Wavelength Assignment: Unidirectional, 6.1.4. Distributed Wavelength Assignment: Unidirectional,
Limited Converters.........................................32 Limited Converters.........................................33
6.1.5. Distributed Wavelength Assignment: Bidirectional, No 6.1.5. Distributed Wavelength Assignment: Bidirectional, No
Converters.................................................33 Converters.................................................34
6.2. Implications for GMPLS Routing...........................33 6.2. Implications for GMPLS Routing...........................34
6.2.1. Need for Wavelength-Specific Maximum Bandwidth 6.2.1. Need for Wavelength-Specific Maximum Bandwidth
Information................................................34 Information................................................35
6.2.2. Need for Wavelength-Specific Availability Information34 6.2.2. Need for Wavelength-Specific Availability Information35
6.2.3. Relationship to Link Bundling and Layering..........35 6.2.3. Relationship to Link Bundling and Layering..........36
6.2.4. WSON Routing Information Summary....................35 6.2.4. WSON Routing Information Summary....................36
6.3. Optical Path Computation and Implications for PCE........36 6.3. Optical Path Computation and Implications for PCE........37
6.3.1. Lightpath Constraints and Characteristics...........36 6.3.1. Lightpath Constraints and Characteristics...........37
6.3.2. Computation Architecture Implications...............37 6.3.2. Computation Architecture Implications...............38
6.3.3. Discovery of RWA Capable PCEs.......................37 6.3.3. Discovery of RWA Capable PCEs.......................38
6.4. Scaling Implications.....................................38 6.4. Scaling Implications.....................................39
6.4.1. Routing.............................................38 6.4.1. Routing.............................................39
6.4.2. Signaling...........................................38 6.4.2. Signaling...........................................39
6.4.3. Path computation....................................38 6.4.3. Path computation....................................39
6.5. Summary of Impacts by RWA Architecture...................39 6.5. Summary of Impacts by RWA Architecture...................40
7. Security Considerations.......................................40 7. Security Considerations.......................................41
8. IANA Considerations...........................................40 8. IANA Considerations...........................................41
9. Acknowledgments...............................................40 9. Acknowledgments...............................................41
10. References...................................................41 10. References...................................................42
10.1. Normative References....................................41 10.1. Normative References....................................42
10.2. Informative References..................................42 10.2. Informative References..................................43
11. Contributors.................................................45 11. Contributors.................................................46
Author's Addresses...............................................45 Author's Addresses...............................................46
Intellectual Property Statement..................................46 Intellectual Property Statement..................................47
Disclaimer of Validity...........................................46 Disclaimer of Validity...........................................48
1. Introduction 1. Introduction
From its beginning Generalized Multi-Protocol Label Switching (GMPLS) From its beginning Generalized Multi-Protocol Label Switching (GMPLS)
was intended to control wavelength switched optical networks (WSON) was intended to control wavelength switched optical networks (WSON)
with the GMPLS architecture document [RFC3945] explicitly mentioning with the GMPLS architecture document [RFC3945] explicitly mentioning
both wavelength and waveband switching and equating wavelengths both wavelength and waveband switching and equating wavelengths
(lambdas) with GMPLS labels. In addition a discussion of optical (lambdas) with GMPLS labels. In addition a discussion of optical
impairments and other constraints on optical routing can be found in impairments and other constraints on optical routing can be found in
[RFC4054]. However, optical technologies have advanced in ways that [RFC4054]. However, optical technologies have advanced in ways that
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1.1.1. Changes from 00 1.1.1. Changes from 00
o Added new first level section on modeling examples and control o Added new first level section on modeling examples and control
plane use cases. plane use cases.
o Added new third level section on wavelength converter pool o Added new third level section on wavelength converter pool
modeling modeling
o Editorial clean up of English and updated references. o Editorial clean up of English and updated references.
1.1.2. Changes from 01
Fixed error in wavelength converter pool example.
2. Terminology 2. Terminology
CWDM: Coarse Wavelength Division Multiplexing. CWDM: Coarse Wavelength Division Multiplexing.
DWDM: Dense Wavelength Division Multiplexing. DWDM: Dense Wavelength Division Multiplexing.
FOADM: Fixed Optical Add/Drop Multiplexer. FOADM: Fixed Optical Add/Drop Multiplexer.
OXC: Optical cross connect. A symmetric optical switching element in OXC: Optical cross connect. A symmetric optical switching element in
which a signal on any ingress port can reach any egress port. which a signal on any ingress port can reach any egress port.
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| 1 1 | | 1 1 | | 1 1 | | 1 1 |
+-----+ +-----+ +-----+ +-----+
Example: Shared Per Link Example: Shared Per Link
In Figure 4 we show a different wavelength pool architecture know as In Figure 4 we show a different wavelength pool architecture know as
"shared per fiber". In this case the ingress and egress pool matrices "shared per fiber". In this case the ingress and egress pool matrices
are simply: are simply:
+-----+ +-----+ +-----+ +-----+
| 1 0 | | 1 0 | | 1 1 | | 1 0 |
WI =| |, WE =| | WI =| |, WE =| |
| 0 1 | | 0 1 | | 1 1 | | 0 1 |
+-----+ +-----+ +-----+ +-----+
___________ +------+ ___________ +------+
| |--------------------------->| | | |--------------------------->| |
| |--------------------------->| C | | |--------------------------->| C |
/| | |--------------------------->| o | E1 /| | |--------------------------->| o | E1
I1 /D+--->| |--------------------------->| m | I1 /D+--->| |--------------------------->| m |
+ e+--->| | | b |====> + e+--->| | | b |====>
====>| M| | Optical | +-----------+ | i | ====>| M| | Optical | +-----------+ | i |
+ u+--->| Switch | | WC Pool | | n | + u+--->| Switch | | WC Pool | | n |
 End of changes. 15 change blocks. 
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