draft-ietf-ccamp-flexible-grid-ospf-ext-06.txt   draft-ietf-ccamp-flexible-grid-ospf-ext-07.txt 
CCAMP Working Group Xian Zhang CCAMP Working Group Xian Zhang
Internet-Draft Haomian Zheng Internet-Draft Haomian Zheng
Intended status: Standards Track Huawei Intended status: Standards Track Huawei
Ramon Casellas Ramon Casellas
CTTC CTTC
O. Gonzalez de Dios O. Gonzalez de Dios
Telefonica Telefonica
D. Ceccarelli D. Ceccarelli
Ericsson Ericsson
Expires: March 23, 2017 September 23, 2016 Expires: April 26, 2017 October 26, 2016
GMPLS OSPF-TE Extensions in support of Flexi-grid DWDM networks GMPLS OSPF-TE Extensions in support of Flexi-grid DWDM networks
draft-ietf-ccamp-flexible-grid-ospf-ext-06.txt draft-ietf-ccamp-flexible-grid-ospf-ext-07.txt
Abstract Abstract
This memo describes the OSPF-TE extensions in support of GMPLS The International Telecommunication Union Telecommunication
control of networks that include devices that use the new flexible Standardization Sector (ITU-T) has extended its Recommendations
optical grid. G.694.1 and G.872 to include a new Dense Wavelength Division
Multiplexing (DWDM) grid by defining a set of nominal central
frequencies, channel spacings, and the concept of the "frequency
slot". Corresponding techniques for data-plane connections are know
as flexi-grid.
Based on the characteristics of flexi-grid defined in G.694.1, RFC
7698 and 7699, this document describes the OSPF-TE extensions in
support of GMPLS control of networks that include devices that use
the new flexible optical grid.
Status of this Memo Status of this Memo
This Internet-Draft is submitted to IETF in full conformance with This Internet-Draft is submitted to IETF in full conformance with
the provisions of BCP 78 and BCP 79. the provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
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Internet-Drafts are draft documents valid for a maximum of six Internet-Drafts are draft documents valid for a maximum of six
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The list of current Internet-Drafts can be accessed at The list of current Internet-Drafts can be accessed at
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This Internet-Draft will expire on March 23, 2017. This Internet-Draft will expire on April 26, 2017.
Copyright Notice Copyright Notice
Copyright (c) 2016 IETF Trust and the persons identified as the Copyright (c) 2016 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
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publication of this document. Please review these documents publication of this document. Please review these documents
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respect to this document. Code Components extracted from this respect to this document. Code Components extracted from this
document must include Simplified BSD License text as described in document must include Simplified BSD License text as described in
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(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
carefully, as they describe your rights and restrictions with carefully, as they describe your rights and restrictions with
respect to this document. Code Components extracted from this respect to this document. Code Components extracted from this
document must include Simplified BSD License text as described in document must include Simplified BSD License text as described in
Section 4.e of the Trust Legal Provisions and are provided without Section 4.e of the Trust Legal Provisions and are provided without
warranty as described in the Simplified BSD License. warranty as described in the Simplified BSD License.
Table of Contents Table of Contents
1. Introduction ................................................. 2 1. Introduction ................................................. 3
2. Terminology .................................................. 3 2. Terminology .................................................. 3
2.1. Conventions Used in this Document ....................... 3 2.1. Conventions Used in this Document ....................... 4
3. Requirements for Flexi-grid Routing .......................... 3 3. Requirements for Flexi-grid Routing .......................... 4
3.1. Available Frequency Ranges .............................. 4 3.1. Available Frequency Ranges .............................. 4
3.2. Application Compliance Considerations ................... 5 3.2. Application Compliance Considerations ................... 5
3.3. Comparison with Fixed-grid DWDM Links ................... 6 3.3. Comparison with Fixed-grid DWDM Links ................... 6
4. Extensions ................................................... 7 4. Extensions ................................................... 7
4.1. ISCD Extensions for Flexi-grid .......................... 7 4.1. ISCD Extensions for Flexi-grid .......................... 7
4.1.1. Switching Capability Specific Information (SCSI).... 8 4.1.1. Switching Capability Specific Information (SCSI).... 8
4.1.2. An SCSI Example ................................... 10 4.1.2. An SCSI Example ................................... 10
4.2. Extensions to Port Label Restriction sub-TLV ........... 12 4.2. Extensions to Port Label Restriction sub-TLV ........... 12
5. IANA Considerations ......................................... 13 5. IANA Considerations ......................................... 13
5.1. New Switching Type ..................................... 13 5.1. New Switching Type ..................................... 13
5.2. New Sub-TLV ............................................ 13 5.2. New Sub-TLV ............................................ 14
6. Implementation Status ....................................... 14 6. Implementation Status ....................................... 14
6.1. Centre Tecnologic de Telecomunicacions de Catalunya (CTTC)14 6.1. Centre Tecnologic de Telecomunicacions de Catalunya (CTTC)15
7. Acknowledgments ............................................. 15 7. Acknowledgments ............................................. 16
8. Security Considerations ..................................... 15 8. Security Considerations ..................................... 16
9. Contributors' Addresses ..................................... 15 9. Contributors' Addresses ..................................... 16
10. References ................................................ 16 10. References ................................................. 17
10.1. Normative References .................................. 16 10.1. Normative References .................................. 17
10.2. Informative References ................................ 16 10.2. Informative References ................................ 17
Authors' Addresses ............................................ 17 Authors' Addresses ............................................. 18
1. Introduction 1. Introduction
[G.694.1] defines the Dense Wavelength Division Multiplexing (DWDM) [G.694.1] defines the Dense Wavelength Division Multiplexing (DWDM)
frequency grids for Wavelength Division Multiplexing (WDM) frequency grids for Wavelength Division Multiplexing (WDM)
applications. A frequency grid is a reference set of frequencies applications. A frequency grid is a reference set of frequencies
used to denote allowed nominal central frequencies that may be used used to denote allowed nominal central frequencies that may be used
for defining applications. The channel spacing is the frequency for defining applications. The channel spacing is the frequency
spacing between two allowed nominal central frequencies. All of the spacing between two allowed nominal central frequencies. All of the
wavelengths on a fiber should use different central frequencies and wavelengths on a fiber should use different central frequencies and
occupy a fixed bandwidth of frequency. occupy a fixed bandwidth of frequency.
Fixed grid channel spacing is selected from 12.5 GHz, 25 GHz, 50 GHz, Fixed grid channel spacing ranges from 12.5 GHz, 25 GHz, 50 GHz, 100
100 GHz and integer multiples of 100 GHz. But [G.694.1] also GHz to integer multiples of 100 GHz. But [G.694.1] also defines
defines "flexible grids", also known as "flexi-grid". The terms "flexible grids", also known as "flexi-grid". The terms "frequency
"frequency slot" (i.e., the frequency range allocated to a specific slot" (i.e., the frequency range allocated to a specific channel and
channel and unavailable to other channels within a flexible grid) unavailable to other channels within a flexible grid) and "slot
and "slot width" (i.e., the full width of a frequency slot in a width" (i.e., the full width of a frequency slot in a flexible grid)
flexible grid) are used to define a flexible grid. are used to define a flexible grid.
[RFC7698] defines a framework and the associated control plane [RFC7698] defines a framework and the associated control plane
requirements for the GMPLS based control of flexi-grid DWDM networks. requirements for the GMPLS based control of flexi-grid DWDM networks.
[RFC6163] provides a framework for GMPLS and Path Computation [RFC6163] provides a framework for GMPLS and Path Computation
Element (PCE) control of Wavelength Switched Optical Networks Element (PCE) control of Wavelength Switched Optical Networks
(WSONs), and [RFC7688] defines the requirements and OSPF-TE (WSONs), and [RFC7688] defines the requirements and OSPF-TE
extensions in support of GMPLS control of a WSON. extensions in support of GMPLS control of a WSON.
[RFC7792] describes requirements and protocol extensions for [RFC7792] describes requirements and protocol extensions for
signaling to set up LSPs in networks that support the flexi-grid, signaling to set up LSPs in networks that support the flexi-grid,
and this document complements [RFC7792] by describing the and this document complements [RFC7792] by describing the
requirement and extensions for OSPF-TE routing in a flexi-grid requirement and extensions for OSPF-TE routing in a flexi-grid
network. network.
This draft compliments the efforts to provide extensions to Open This document complements the efforts to provide extensions to Open
Short Path First (OSPF) Traffic-Engineering (TE) protocol so as to Short Path First (OSPF) Traffic-Engineering (TE) protocol so as to
support GMPLS control of flexi-grid networks. support GMPLS control of flexi-grid networks.
2. Terminology 2. Terminology
For terminology related to flexi-grid, please consult [RFC7698] and For terminology related to flexi-grid, please consult [RFC7698] and
[G.694.1]. [G.694.1].
2.1. Conventions Used in this Document 2.1. Conventions Used in this Document
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC-2119 [RFC2119]. document are to be interpreted as described in RFC-2119 [RFC2119].
3. Requirements for Flexi-grid Routing 3. Requirements for Flexi-grid Routing
The architecture for establishing LSPs in a Spectrum Switched The architecture for establishing LSPs in a Spectrum Switched
optical Network (SSON) is described in [RFC7698]. optical Network (SSON) is described in [RFC7698].
A flexi-grid LSP occupies a specific frequency slot, i.e. a range of A flexi-grid LSP occupies a specific frequency slot, i.e., a
frequencies. The process of computing a route and the allocation of frequency range. The process of computing a route and the
a frequency slot is referred to as RSA (Routing and Spectrum allocation of a frequency slot is referred to as RSA (Routing and
Assignment). [RFC7698] describes three types of architectural Spectrum Assignment). [RFC7698] describes three types of
approaches to RSA: combined RSA; separated RSA; and distributed SA. architectural approaches to RSA: combined RSA, separated RSA, and
The first two approaches among them could be called "centralized SA" distributed SA. The first two approaches among them could be called
because the spectrum (frequency slot) assignment is performed by a "centralized SA" because the spectrum (frequency slot) assignment is
single entity before the signaling procedure. performed by a single entity before the signaling procedure.
In the case of centralized SA, the assigned frequency slot is In the case of centralized SA, the assigned frequency slot is
specified in the RSVP-TE Path message during the signaling process. specified in the RSVP-TE Path message during the signaling process.
In the case of distributed SA, only the requested slot width of the In the case of distributed SA, only the requested slot width of the
flexi-grid LSP is specified in the Path message, allowing the flexi-grid LSP is specified in the Path message, allowing the
involved network elements to select the frequency slot to be used. involved network elements to select the frequency slot to be used.
If the capability of switching or converting the whole optical If the capability of switching or converting the whole optical
spectrum allocated to an optical spectrum LSP is not available at spectrum allocated to an optical spectrum LSP is not available at
nodes along the path of the LSP, the LSP is subject to the Optical nodes along the path of the LSP, the LSP is subject to the Optical
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3.1. Available Frequency Ranges 3.1. Available Frequency Ranges
In the case of flexi-grids, the central frequency steps from 193.1 In the case of flexi-grids, the central frequency steps from 193.1
THz with 6.25 GHz granularity. The calculation method of central THz with 6.25 GHz granularity. The calculation method of central
frequency and the frequency slot width of a frequency slot are frequency and the frequency slot width of a frequency slot are
defined in [G.694.1], i.e., by using nominal central frequency n and defined in [G.694.1], i.e., by using nominal central frequency n and
the slot width m. the slot width m.
On a DWDM link, the allocated or in-use frequency slots must not On a DWDM link, the allocated or in-use frequency slots must not
overlap with each other. However, the border frequencies of two overlap with each other. However, the border frequencies of two
frequency slots may be the same frequency, i.e., the highest frequency slots may be the same frequency, i.e., the upper bound of
frequency of a frequency slot may be the lowest frequency of the a frequency slot and the lower bound of the directly adjacent
next frequency slot. frequency slot are the same.
Frequency Slot 1 Frequency Slot 2 Frequency Slot 1 Frequency Slot 2
+-----------+-----------------------+ +-----------+-----------------------+
| | | | | |
-9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10 11 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10 11
...+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--... ...+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--...
------------ ------------------------ ------------ ------------------------
^ ^ ^ ^
Central F = 193.1THz Central F = 193.1375 THz Central F = 193.1THz Central F = 193.1375 THz
Slot width = 25 GHz Slot width = 50 GHz Slot width = 25 GHz Slot width = 50 GHz
skipping to change at page 6, line 25 skipping to change at page 6, line 31
The combination of slot width range and slot width granularity can The combination of slot width range and slot width granularity can
be used to determine the slot widths set supported by a port. be used to determine the slot widths set supported by a port.
3.3. Comparison with Fixed-grid DWDM Links 3.3. Comparison with Fixed-grid DWDM Links
In the case of fixed-grid DWDM links, each wavelength has a pre- In the case of fixed-grid DWDM links, each wavelength has a pre-
defined central frequency and each wavelength maps to a pre-defined defined central frequency and each wavelength maps to a pre-defined
central frequency and the usable frequency range is implicit by the central frequency and the usable frequency range is implicit by the
channel spacing. All the wavelengths on a DWDM link can be channel spacing. All the wavelengths on a DWDM link can be
identified with an identifier that mainly convey its central identified with an identifier that mainly conveys its central
frequency as the label defined in [RFC6205], and the status of the frequency as the label defined in [RFC6205], and the status of the
wavelengths (available or not) can be advertised through a routing wavelengths (available or not) can be advertised through a routing
protocol. protocol.
Figure 2 shows a link that supports a fixed-grid with 50 GHz channel Figure 2 shows a link that supports a fixed-grid with 50 GHz channel
spacing. The central frequencies of the wavelengths are pre-defined spacing. The central frequencies of the wavelengths are pre-defined
by values of "n" and each wavelength occupies a fixed 50 GHz by values of "n" and each wavelength occupies a fixed 50 GHz
frequency range as described in [G.694.1]. frequency range as described in [G.694.1].
W(-2) | W(-1) | W(0) | W(1) | W(2) | W(-2) | W(-1) | W(0) | W(1) | W(2) |
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| 5 | Starting n (-1) | No. of Effec. Bits(9)| | 5 | Starting n (-1) | No. of Effec. Bits(9)|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|1|1|1|1|1|1|1|1|1| padding bits (0s) | |1|1|1|1|1|1|1|1|1| padding bits (0s) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
This denotes that other than the advertised available nominal This denotes that other than the advertised available nominal
central frequencies, the other nominal central frequencies within central frequencies, the other nominal central frequencies within
the whole frequency range supported by the link are not available the whole frequency range supported by the link are not available
for flexi-grid LSP set up. for flexi-grid LSP set up.
If a LSP with slot width (m) equal to 1 is set up using this link, If a LSP with slot width m equals to 1 is set up using this link,
say using n= -1, then the SCSI information is updated to be the say using n= -1, then the SCSI information is updated to be the
following: following:
0 1 2 3 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 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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type = 1 | Length | | Type = 1 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Priority | Reserved | | Priority | Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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support only a restricted subset of the full flexible grid. The support only a restricted subset of the full flexible grid. The
Port Label Restriction sub-TLV is defined in [RFC7579]. It can be Port Label Restriction sub-TLV is defined in [RFC7579]. It can be
used to describe the label restrictions on a port and is carried in used to describe the label restrictions on a port and is carried in
the top-level Link TLV as specified in [RFC7580]. A new restriction the top-level Link TLV as specified in [RFC7580]. A new restriction
type, the flexi-grid Restriction Type, is defined here to specify type, the flexi-grid Restriction Type, is defined here to specify
the restrictions on a port to support flexi-grid. the restrictions on a port to support flexi-grid.
0 1 2 3 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 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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| MatrixID | RstType = 5 | Switching Cap | Encoding | | MatrixID | RstType = 5 | Switching Cap | Encoding |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| C.S. | C.F.G | S.W.G | Reserved | | C.S. | C.F.G | S.W.G | Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Min Slot Width | Reserved | | Min Slot Width | Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
MatrixID (8 bits): As defined in [RFC7579]. MatrixID (8 bits): As defined in [RFC7579].
RstType (Restriction Type, 8 bits): Takes the value of 5 to indicate RstType (Restriction Type, 8 bits): Takes the value of 5 to indicate
the restrictions on a port to support flexi-grid. the restrictions on a port to support flexi-grid.
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Upon approval of this document, IANA will make the assignment in the Upon approval of this document, IANA will make the assignment in the
"Switching Types" section of the "GMPLS Signaling Parameters" "Switching Types" section of the "GMPLS Signaling Parameters"
registry located at http://www.iana.org/assignments/gmpls-sig- registry located at http://www.iana.org/assignments/gmpls-sig-
parameters: parameters:
Value Name Reference Value Name Reference
--------- -------------------------- ---------- --------- -------------------------- ----------
152 (*) Flexi-Grid-LSC [This.I-D] 152 (*) Flexi-Grid-LSC [This.I-D]
(*) Suggested value (*) Suggested value
5.2. New Sub-TLV 5.2. New Sub-TLV
This document defines one new sub-TLV that are carried in the This document defines one new sub-TLV that are carried in the
Interface Switching Capability Descriptors [RFC4203] with Signal Interface Switching Capability Descriptors [RFC4203] with Signal
Type Flexi-Grid-LSC. Type Flexi-Grid-LSC.
Upon approval of this document, IANA will create and maintain a new Upon approval of this document, IANA will create and maintain a new
skipping to change at page 14, line 13 skipping to change at page 14, line 43
1 Frequency availability bitmap [This.I-D] 1 Frequency availability bitmap [This.I-D]
6. Implementation Status 6. Implementation Status
[RFC Editor Note: Please remove this entire section prior to [RFC Editor Note: Please remove this entire section prior to
publication as an RFC.] publication as an RFC.]
This section records the status of known implementations of the This section records the status of known implementations of the
protocol defined by this specification at the time of posting of protocol defined by this specification at the time of posting of
this Internet-Draft, and is based on a proposal described in RFC this Internet-Draft, and is based on a proposal described in RFC
7942. The description of implementations in this section 7942. The description of implementations in this section is
is intended to assist the IETF in its decision processes in intended to assist the IETF in its decision processes in progressing
progressing drafts to RFCs. Please note that the listing of any drafts to RFCs. Please note that the listing of any individual
individual implementation here does not imply endorsement by the implementation here does not imply endorsement by the IETF.
IETF. Furthermore, no effort has been spent to verify the Furthermore, no effort has been spent to verify the information
information presented here that was supplied by IETF contributors. presented here that was supplied by IETF contributors. This is not
This is not intended as, and must not be construed to be, a catalog intended as, and must not be construed to be, a catalog of available
of available implementations or their features. Readers are advised implementations or their features. Readers are advised to note that
to note that other implementations may exist. other implementations may exist.
According to RFC 7942, "this will allow reviewers and working groups According to RFC 7942, "this will allow reviewers and working groups
to assign due consideration to documents that have the benefit of to assign due consideration to documents that have the benefit of
running code, which may serve as evidence of valuable running code, which may serve as evidence of valuable
experimentation and feedback that have made the implemented experimentation and feedback that have made the implemented
protocols more mature." It is up to the individual working groups to protocols more mature. It is up to the individual working groups to
use this information as they see fit. use this information as they see fit.
6.1. Centre Tecnologic de Telecomunicacions de Catalunya (CTTC) 6.1. Centre Tecnologic de Telecomunicacions de Catalunya (CTTC)
Organization Responsible for the Implementation: CTTC - Centre Organization Responsible for the Implementation: CTTC - Centre
Tecnologic de Telecomunicacions de Catalunya (CTTC), Optical Tecnologic de Telecomunicacions de Catalunya (CTTC), Optical
Networks and Systems Department, http://wikiona.cttc.es. Networks and Systems Department, http://wikiona.cttc.es.
Implementation Name and Details: ADRENALINE testbed, Implementation Name and Details: ADRENALINE testbed,
http://networks.cttc.es/experimental-testbeds/ http://networks.cttc.es/experimental-testbeds/
skipping to change at page 16, line 4 skipping to change at page 16, line 35
9. Contributors' Addresses 9. Contributors' Addresses
Adrian Farrel Adrian Farrel
Old Dog Consulting Old Dog Consulting
Email: adrian@olddog.co.uk Email: adrian@olddog.co.uk
Fatai Zhang Fatai Zhang
Huawei Technologies Huawei Technologies
Email: zhangfatai@huawei.com Email: zhangfatai@huawei.com
Lei Wang, Lei Wang,
Beijing University of Post and Telecommunications ZTE
Email: wang.lei@bupt.edu.cn Email: wang.lei@bupt.edu.cn
Guoying Zhang, Guoying Zhang,
China Academy of Telecom Research China Academy of Information and Communication Technology
Email: zhangguoying@ritt.cn Email: zhangguoying@ritt.cn
10. References 10. References
10.1. Normative References 10.1. Normative References
[RFC2119] S. Bradner, "Key words for use in RFCs to indicate [RFC2119] S. Bradner, "Key words for use in RFCs to indicate
requirements levels", RFC 2119, March 1997. requirements levels", RFC 2119, March 1997.
[G.694.1] ITU-T Recommendation G.694.1 (revision 2), "Spectral grids [G.694.1] ITU-T Recommendation G.694.1 (revision 2), "Spectral grids
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