Network Working Group Iftekhar Hussain
Internet Draft Marco Sosa
Intended status: Standard Track Infinera
Expires: April 2014
Abinder Dhillon
Fujitsu Network Communications
October 8, 2013
Super-Channel Optical Parameters GMPLS Routing Extensions
draft-hussain-ccamp-super-channel-param-ospfte-03.txt
Abstract
This document builds on [6][7] and defines GMPLS routing extensions
to allow added CSPF constraints for efficient super-channel spectrum
assignment on flexible grid networks.
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Table of Contents
1. Introduction..................................................23
2. Terminology....................................................3
3. GMPLS Routing Extensions for Super-Channel Optical Parameters.34
3.1. Super-Channel In-Use Slices sub-TLV......................45
3.2. Super-Channel Carriers sub-TLV............................5
4. Procedure for OSPF-TE Advertisement...........................56
5. Possible Applications..........................................6
6. TLV Encoding Examples..........................................6
7. Security Considerations.......................................67
8. IANA Considerations...........................................67
9. References.....................................................7
9.1. Normative References......................................7
9.2. Informative References....................................7
10. Acknowledgments...............................................8
1. Introduction
Future transport systems are expected to support service upgrades to
data rates of 1 Tbps and beyond. To scale networks beyond 100Gbps,
multi-carrier super-channels coupled with advanced multi-level
modulation formats and flexible channel spectrum bandwidth
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allocation schemes have become pivotal for future spectral efficient
transport network architectures [1,2].
The coexistence of super-channels using different modulation formats
on the same optical fiber network infrastructure may have a
detrimental effect on the Optical Signal to Noise Ratio (OSNR) of
adjacent super-channels due to interference such as cross-phase
modulation. Therefore, it may be highly desirable to be able to
evaluate the mutual impact of the existing and new super-channels on
each other's quality of transmission (e.g., bit error rate) before
establishing new super-channels.
The document [9] defines GMPLS signaling extensions to convey super-
channel optical parameters. This document defines GMPLS routing
extensions to advertise the above mentioned super-channel parameters
via OSPF-TE link LSA using new Super-Channel sub-TLV. This sub-TLV
is carried under the Switching Capability-specific information
(SCSI) field of the Interface Switching Capability Descriptor (ISCD)
with the Super-Channel-Switch-Capable (SCSC) value defined in [6].
This information allows each source node across the network to apply
added CSPF constraints and assign new super-channels spectrum
efficiently by considering not only the availability of the
required number of slices but also the optical signal compatibility
of the existing and the new super-channels along the desired path.
2. Terminology
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].
3. GMPLS Routing Extensions for Super-Channel Optical Parameters
This document defines OSPF-TE extensions for advertising following
information using the Super-Channel sub-TLV depicted in Figure 1.
For each super-channel this sub-TLV advertises following
information:
o Super-Channel In-Use Slices sub-TLV
o Super-Channel Carriers 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
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| TLV Type | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| ~
~ Super-Channel 1 In-Use Slices sub-TLV ~
~ ~
~ |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| ~
~ Super-Channel 1 Carriers TLV sub-TLV ~
~ ~
~ |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| ~
~ More entries ~
~ ~
~ |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| ~
~ Super-Channel n In-Use Slices TLV sub-TLV ~
~ ~
~ |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| ~
~ Super-Channel n Carriers TLV sub-TLV ~
~ ~
~ |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 1: Super-Channel TLV Format.
The Super-Channel sub-TLV is advertised in the OSPF-TE link LSA
under the under the SCSI field of the ISCD using Super-Channel-
Switch-Capable (SCSC) value defined in [6]
3.1. Super-Channel In-Use Slices sub-TLV
This sub-TLV contains the in-use slices information of a super-
channel. For further information about various fields in this sub-
TLV refer to [6][7].
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| TLV Type | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Super-Channel Id |Grid | S.S. | PRI | Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| n_start_1 (spectral slot 1) | n_end_1 (spectral slot 1) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| n_start_2 (spectral slot 2) | n_end_2 (spectral slot 2) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| ~
~ More entries ~
~ |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| n_start_n (spectral slot n) | n_end_n (spectral slot n) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 2: Super-Channel In-Use Slices sub-TLV Format.
[Editor's Note: encoding of in-use slices in bitmap format is left
for a possible future revision]
3.2. Super-Channel Carriers sub-TLV
The format of the Super-Channel Carriers sub-TLV is defined in [9].
In summary, this sub-TLV contains following information.
o Number of Carriers in the Super-Channel
o Carrier sub-TLV
o Carrier Center Frequency sub-sub-TLV
o Carrier Modulation sub-sub-TLV
o Carrier FEC sub-sub-TLV
4. Procedure for OSPF-TE Advertisement
This section describes procedure for advertising the aforementioned
information in the OSPF-TE link LSAs.
o The optical parameters of the super-channel are signaled when new
super-channels are established (see [9]).
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o Over time change in the status of in-use slices occurs when new
super-channels are setup (or when established super-channels are
released).
o Each node along the path traversed by the super-channels
advertises the current status of the in-use slices for each
super-channel in the OSPF-TE link LSA using sub-TLVs described
earlier.
o Through OSPF-TE LSAs flooding other nodes in the routing domain
learn about the current status of in-use slices on each TE link.
5. Possible Applications
o The presence of this information across the network topology
enables source nodes in the network to apply added CSPF
constraints for example to:
o Group super-channels with different modulation formats in
different bands (slice ranges)
o Group super-channels with same bit-rate in a band while
separating with guard band from super-channels with different
bit-rate.
o Allows efficient network utilization (e.g., reduces new requests
blocking probability) by avoiding excessive worst-case OSNR
penalty while preserving desired quality of transmission of the
existing super-channels
6. TLV Encoding Examples
To be added later.
7. Security Considerations
<Add any security considerations>
8. IANA Considerations
IANA needs to assign a new Grid field value to represent ITU-T Flex-
Grid.
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9. References
9.1. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC3471] Berger, L., Ed., "Generalized Multi-Protocol Label
Switching (GMPLS) Signaling Functional Description", RFC
3471, January 2003.
[RFC6205] Otani, T., Ed., "Generalized Labels for Lambda-Switch-
Capable (LSC) Label Switching Routers", RFC 6205, March
2011.
[RFC6163] Lee, Y., Ed., "Framework for GMPLS and Path Computation
Element (PCE) Control of Wavelength Switched Optical
Networks (WSONs)", RFC 6163, April 2011
9.2. Informative References
[1] Gringeri, S., Basch, B. Shukla,V. Egorov, R. and Tiejun J.
Xia, "Flexible Architectures for Optical Transport Nodes and
Networks", IEEE Communications Magazine, July 2010, pp. 40-50
[2] M. Jinno et. al., "Spectrum-Efficient and Scalable Elastic
Optical Path Network: Architecture, Benefits and Enabling
Technologies", IEEE Comm. Mag., Nov. 2009, pp. 66-73.
[3] S. Chandrasekhar and X. Liu, "Terabit Super-Channels for High
Spectral Efficiency Transmission",in Proc. ECOC 2010, paper
Tu.3.C.5, Torino (Italy), September 2010.
[4] ITU-T Recommendation G.694.1, "Spectral grids for WDM
applications: DWDM frequency grid", June 2002
[5] [4] "Finisar to Demonstrate Flexgrid(TM) WSS Technology at
ECOC 2010", press release.
[6] Abinder D., et.al., "OSPFTE extension to support GMPLS for
Flex Grid", draft-dhillon-ccamp-super-channel-ospfte-ext, work
in progress, November 2011.
[7] Iftekhar H., et.al., "Generalized Label for Super-Channel
Assignment on Flexible Grid", draft-hussain-ccamp-super-
channel-label, work in progress, October 2011.
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[8] G. Bernstein, et.al., "Routing and Wavelength Assignment
Information Encoding for Wavelength Switched Optical
Networks", draft-ietf-ccamp-rwa-wson-encode, work in progress,
October 2011.
[9] Iftekhar H., et.al., "Super-Channel Optical Parameters GMPLS
Signaling Extensions", draft-hussain-ccamp-super-channel-
param-sig, work in progress, March 2012.
10. Acknowledgments
<Add any acknowledgements>
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Authors' Addresses
Iftekhar Hussain
Infinera
140 Caspian Ct., Sunnyvale, CA 94089
Email: ihussain@infinera.com
Marco Sosa
Infinera
140 Caspian Ct., Sunnyvale, CA 94089
Email: msosa@infinera.com
Abinder Dhillon
Fujitsu Network Communications
2801 Telecom Parkway, Richardson, TX 75082
Email: abinder.dhillon@us.fujitsu.com
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Contributor's Addresses
Rajan Rao
Infinera
140 Caspian Ct., Sunnyvale, CA 94089
Email: rrao@infinera.com
Biao Lu
Infinera
140 Caspian Ct., Sunnyvale, CA 94089
Email: blu@infinera.com
Subhendu Chattopadhyay
Infinera
140 Caspian Ct., Sunnyvale, CA 94089
Email: schattopadhyay@infinera.com
Harpreet Uppal
Infinera
140 Caspian Ct., Sunnyvale, CA 94089
Email: harpreet.uppal@infinera.com
Vinayak Dangui
Infinera
140 Caspian Ct., Sunnyvale, CA 94089
Email: vdangui@infinera.com
Michael VanLeeuwen
Infinera
140 Caspian Ct., Sunnyvale, CA 94089
Email: MVanleeuwen@infinera.com
Zhong Pan
Infinera
140 Caspian Ct., Sunnyvale, CA 94089
Email: zpan@infinera.com
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