Network Working Group Y. Lee
Internet Draft Huawei
Intended status: Standards Track G. Bernstein
Expires: September 2010 Grotto Networking
March 5, 2010
OSPF Enhancement for Signal and Network Element Compatibility for
Wavelength Switched Optical Networks
draft-ietf-ccamp-wson-signal-compatibility-ospf-01.txt
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Abstract
This document provides GMPLS OSPF routing enhancements to support
signal compatibility constraints associated with WSON network
elements. These routing enhancements are required in common optical
or hybrid electro-optical networks where not all of the optical
signals in the network are compatible with all network elements
participating in the network.
This compatibility constraint model is applicable to common optical
or hybrid electro optical systems such as OEO switches, regenerators,
and wavelength converters since such systems can be limited to
processing only certain types of WSON signals.
Conventions used in this document
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].
Table of Contents
1. Introduction...................................................3
1.1. Revision History..........................................3
2. Compatibility and Accessibility Sub-TLVs.......................3
2.1. Resource Block Information sub-TLV........................4
3. Security Considerations........................................5
4. IANA Considerations............................................5
4.1. Node Information..........................................5
5. References.....................................................6
5.1. Normative References......................................6
5.2. Informative References....................................7
6. Contributors...................................................7
Authors' Addresses................................................7
Intellectual Property Statement...................................8
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Disclaimer of Validity............................................8
1. Introduction
The documents [WSON-Frame, WSON-Info, RWA-Encode] explain how to
extend the wavelength switched optical network (WSON) control plane
to allow both multiple WSON signal types and common hybrid electro
optical systems as well hybrid systems containing optical switching
and electro-optical resources. In WSON, not all of the optical
signals in the network are compatible with all network elements
participating in the network. Therefore, signal compatibility is an
important constraint in path computation in a WSON.
This document provides GMPLS OSPF routing enhancements to support
signal compatibility constraints associated with general WSON network
elements. These routing enhancements are required in common optical
or hybrid electro-optical networks where not all of the optical
signals in the network are compatible with all network elements
participating in the network.
This compatibility constraint model is applicable to common optical
or hybrid electro optical systems such as OEO switches, regenerators,
and wavelength converters since such systems can be limited to
processing only certain types of WSON signals.
1.1. Revision History
From 00 to 01: The details of the encodings for compatibility moved
from this document to [RWA_Encode].
2. Compatibility and Accessibility Sub-TLVs
The encodings described in [RWA-Encode] involve node level
properties, rather than link level, and hence belong in an
appropriate node oriented top level TLV. The OSPF TE LSA node
attribute TLV of [OSPF-Node] is used for this purpose.
This document defines four OSPF TE LSA node attribute sub-TLVs based
on the encodings in [RWA-Encode]:
Sub-TLV Type Length Name
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TBA variable Resource Block Information
TBA variable Resource Block Accessibility
TBA variable Resource Block Wavelength Constraints
TBA variable Resource Block Pool State
The detail encodings of these sub-TLVs are found in [RWA-Encode] as
indicated in the table below.
Name Section[RWA-Encode]
Resource Block Information 5.1
Resource Block Accessibility 4.1
Resource Block Wavelength Constraints 4.2
Resource Block Pool State 4.3
Among the sub-TLVs defined above, the Resource Block Pool State sub-
TLV is dynamic in nature while the rest are static. As such, it will
be separated out from the rest and make use of multiple TE LSA
instances per source, per RFC3630 multiple instance capability.
2.1. Resource Block Information sub-TLV
There are seven nested sub-TLVs defined in the Resource Block
Information sub-TLV.
Sub-TLV Type Length Name
TBA variable Input Modulation Format List
TBA variable Input FEC Type List
TBA variable Input Bit Range List
TBA variable Input Client Signal List
TBA variable Processing Capability List
TBA variable Output Modulation Format List
TBA variable Output FEC Type List
The detail encodings of these sub-TLVs are found in [RWA-Encode] as
indicated in the table below.
Name Section[RWA-Encode]
Input Modulation Format List 5.2
Input FEC Type List 5.3
Input Bit Range List 5.4
Input Client Signal List 5.5
Processing Capability List 5.6
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Output Modulation Format List 5.7
Output FEC Type List 5.8
3. Security Considerations
This document does not introduce any further security issues other
than those discussed in [RFC 3630], [RFC 4203].
4. IANA Considerations
According to [RFC3630], the OSPF TE LSA and Types for sub-TLVs for
each top level Types must be assigned by Expert Review, and must be
registered with IANA.
IANA is requested to allocate new Types for the sub-TLVs as defined
in Sections 2 and 2.1 as follows:
4.1. Node Information
This document introduces the following sub-TLVs of Node Attribute TLV
(Value TBD, see [OSPF-Node])
Sub-TLV Type Length Name
TBA variable Resource Block Information
TBA variable Resource Block Accessibility
TBA variable Resource Block Wavelength Constraints
TBA variable Resource Block Pool State
Sub-TLV Type Length Name
TBA variable Input Modulation Format List
TBA variable Input FEC Type List
TBA variable Input Bit Range List
TBA variable Input Client Signal List
TBA variable Processing Capability List
TBA variable Output Modulation Format List
TBA variable Output FEC Type List
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5. References
5.1. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC3471] Berger, L., "Generalized Multi-Protocol Label Switching
(GMPLS) Signaling Functional Description", RFC 3471,
January 2003.
[RFC3630] Katz, D., Kompella, K., and Yeung, D., "Traffic
Engineering (TE) Extensions to OSPF Version 2", RFC
3630, September 2003.
[G.694.1] ITU-T Recommendation G.694.1, "Spectral grids for WDM
applications: DWDM frequency grid", June, 2002.
[RFC4202] Kompella, K., Ed., and Y. Rekhter, Ed., "Routing Extensions
in Support of Generalized Multi-Protocol Label Switching
(GMPLS)", RFC 4202, October 2005
[RFC4203] Kompella, K., Ed., and Y. Rekhter, Ed., "OSPF Extensions in
Support of Generalized Multi-Protocol Label Switching
(GMPLS)", RFC 4203, October 2005.
[RFC4328] Papadimitriou, D., Ed., "Generalized Multi-Protocol Label
Switching (GMPLS) Signaling Extensions for G.709 Optical
Transport Networks Control", RFC 4328, January 2006.
[RFC5307] Kompella, K., Ed., and Y. Rekhter, Ed., "IS-IS Extensions
in Support of Generalized Multi-Protocol Label Switching
(GMPLS)", RFC 5307, October 2008.
[OSPF-Node] R. Aggarwal and K. Kompella, "Advertising a Router's
Local Addresses in OSPF TE Extensions", draft-ietf-ospf-
te-node-addr, work in progress.
[Lambda-Labels] T. Otani, H. Guo, K. Miyazaki, D. Caviglia,
"Generalized Labels for G.694 Lambda-Switching
Capable Label Switching Routers", work in progress:
draft-ietf-ccamp-gmpls-g-694-lambda-labels-04.txt,
March 2009.
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[WSON-Frame] Y. Lee, G. Bernstein, W. Imajuku, "Framework for GMPLS
and PCE Control of Wavelength Switched Optical
Networks", work in progress: draft-ietf-ccamp-rwa-WSON-
Framework-04.txt, October 2009.
[WSON-Info] Y. Lee, G. Bernstein, D. Li, W. Imajuku, "Routing and
Wavelength Assignment Information Model for Wavelength
Switched Optical Networks", work in progress: draft-ietf-
ccamp-rwa-info-05.txt, October 2009.
[RWA-Encode]G. Bernstein, Y. Lee, D. Li, W. Imajuku, "Routing and
Wavelength Assignment Information Encoding for
Wavelength Switched Optical Networks", work in
progress: draft-ietf-ccamp-rwa-wson-encode-04.txt,
March 2010.
6. Contributors
Authors' Addresses
Young Lee (ed.)
Huawei Technologies
1700 Alma Drive, Suite 100
Plano, TX 75075
USA
Phone: (972) 509-5599 (x2240)
Email: ylee@huawei.com
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Greg M. Bernstein (ed.)
Grotto Networking
Fremont California, USA
Phone: (510) 573-2237
Email: gregb@grotto-networking.com
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Acknowledgment
Funding for the RFC Editor function is currently provided by the
Internet Society.
Lee and Bernstein Expires September 5, 2010 [Page 9]
