Network Working Group Y. Lee
Internet Draft Huawei
Intended status: Standards Track G. Bernstein
Expires: August 2011 Grotto Networking
February 28, 2011
OSPF Enhancement for Signal and Network Element Compatibility for
Wavelength Switched Optical Networks
draft-ietf-ccamp-wson-signal-compatibility-ospf-03.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. The Optical Node Property TLV..................................3
2.1. Sub-TLV Details...........................................4
2.1.1. Resource Block Information...........................4
2.1.2. Resource Block Accessibility.........................5
2.1.3. Resource Block Wavelength Constraints................5
2.1.4. Resource Block Pool State............................5
3. Security Considerations........................................6
4. IANA Considerations............................................6
5. References.....................................................8
5.1. Normative References......................................8
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6. Contributors...................................................9
Authors' Addresses................................................9
Intellectual Property Statement..................................10
Disclaimer of Validity...........................................10
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].
From 01 to 02: Editorial changes.
From 02 to 03: Add a new Top Level Node TLV, Optical Node Property
TLV to carry WSON specific node information.
2. The Optical Node Property TLV
[RFC 3630] defines OSPF TE LSA using an opaque LSA. This document
adds a new top level TLV for use in the OSPF TE LSA: the Optical Node
Property TLV.
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The Optical Node Property TLV contains all WSON-specific node
properties and signal compatibility constraints. The detailed
encodings of these properties are defined in [RWA-Encode].
The following sub-TLVs of the Optical Node Property TLV are defined:
Value Length Sub-TLV Type
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.
Sub-TLV Type 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
2.1. Sub-TLV Details
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.
2.1.1. Resource Block Information
Resource Block Information sub-TLVs are used to convey relatively
static information about individual resource blocks including the
resource block properties and the number of resources in a block.
There are seven nested sub-TLVs defined in the Resource Block
Information sub-TLV.
Value Length Sub-TLV Type
TBA variable Input Modulation Format List
TBA variable Input FEC Type List
TBA variable Input Bit Range List
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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
Output Modulation Format List 5.7
Output FEC Type List 5.8
2.1.2. Resource Block Accessibility
This sub-TLV describes the structure of the resource pool in relation
to the switching device. In particular it indicates the ability of an
ingress port to reach a resource block and of a resource block to
reach a particular egress port.
2.1.3. Resource Block Wavelength Constraints
Resources, such as wavelength converters, etc., may have a limited
input or output wavelength ranges. Additionally, due to the structure
of the optical system not all wavelengths can necessarily reach or
leave all the resources. Resource Block Wavelength Constraints sub-
TLV describe these properties.
2.1.4. Resource Block Pool State
This sub-TLV describes the usage state of a resource that can be
encoded as either a list of 16 bit integer values or a bit map
indicating whether a single resource is available or in use. This
information can be relatively dynamic, i.e., can change when a
connection is established or torn down.
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3. Security Considerations
This document does not introduce any further security issues other
than those discussed in [RFC 3630], [RFC 4203].
4. IANA Considerations
This document introduces a new Top Level Node TLV (Optical Node
Property TLV) under the OSPF TE LSA defined in [RFC 3630].
Value TLV Type
TBA Optical Node Property
IANA is to allocate a new TLV Type and its Value for this Top Level
Node TLV.
This document also introduces the following sub-TLVs associated with
the Optical Node Property TLV as defined in Section 2.1 as follows:
Value Length Sub-TLV Type
TBA variable Resource Block Information
TBA variable Resource Block Accessibility
TBA variable Resource Block Wavelength Constraints
TBA variable Resource Block Pool State
IANA is to allocate new sub-TLV Types and their Values for these sub-
TLVs defined under the Optical Node Property TLV.
There are seven nested sub-TLVs defined in the Resource Block
Information sub-TLV as follows:
Value Length Sub-TLV Type
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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IANA is to allocate new Sub-TLV Types and their Values for these Sub-
TLVs defined under the Resource Block Information Sub-TLV.
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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", draft-ietf-ccamp-
gmpls-g-694-lambda-labels, work in progress.
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[WSON-Frame] Y. Lee, G. Bernstein, W. Imajuku, "Framework for GMPLS
and PCE Control of Wavelength Switched Optical
Networks", draft-ietf-ccamp-rwa-WSON-Framework, work in
progress.
[WSON-Info] Y. Lee, G. Bernstein, D. Li, W. Imajuku, "Routing and
Wavelength Assignment Information Model for Wavelength
Switched Optical Networks", draft-ietf-ccamp-rwa-info
work in progress.
[RWA-Encode]G. Bernstein, Y. Lee, D. Li, W. Imajuku, "Routing and
Wavelength Assignment Information Encoding for
Wavelength Switched Optical Networks", draft-ietf-
ccamp-rwa-wson-encode, work in progress.
6. Authors and 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.
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