draft-ietf-ccamp-flexible-grid-ospf-ext-03.txt   draft-ietf-ccamp-flexible-grid-ospf-ext-04.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: April 13, 2016 October 16, 2015 Expires: October 25, 2016 April 25, 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-03.txt draft-ietf-ccamp-flexible-grid-ospf-ext-04.txt
Abstract Abstract
This memo describes the OSPF-TE extensions in support of GMPLS This memo describes the OSPF-TE extensions in support of GMPLS
control of networks that include devices that use the new flexible control of networks that include devices that use the new flexible
optical grid. 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
skipping to change at page 1, line 45 skipping to change at page 1, line 45
documents at any time. It is inappropriate to use Internet-Drafts documents at any time. It is inappropriate to use Internet-Drafts
as reference material or to cite them other than as "work in as reference material or to cite them other than as "work in
progress." progress."
The list of current Internet-Drafts can be accessed at The list of current Internet-Drafts can be accessed at
http://www.ietf.org/ietf/1id-abstracts.txt. http://www.ietf.org/ietf/1id-abstracts.txt.
The list of Internet-Draft Shadow Directories can be accessed at The list of Internet-Draft Shadow Directories can be accessed at
http://www.ietf.org/shadow.html. http://www.ietf.org/shadow.html.
This Internet-Draft will expire on April 13, 2016. This Internet-Draft will expire on October 25, 2016.
Copyright Notice Copyright Notice
Copyright (c) 2015 IETF Trust and the persons identified as the Copyright (c) 2015 IETF Trust and the persons identified as the
document authors. All rights reserved. document authors. All rights reserved.
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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
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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 ................................................ 2
2. Terminology ................................................. 3 2. Terminology ................................................. 3
2.1. Conventions Used in this Document .......................3 2.1. Conventions Used in this Document....................... 3
3. Requirements for Flexi-grid Routing ..........................3 3. Requirements for Flexi-grid Routing.......................... 3
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) .... 7 4.1.1. Switching Capability Specific Information (SCSI)....7
4.1.2. An SCSI Example.................................... 9 4.1.2. An SCSI Example.................................... 9
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 ........................................... 13
6. Implementation Status....................................... 13 6. Implementation Status....................................... 13
6.1. Centre Tecnologic de Telecomunicacions de Catalunya (CTTC)14 6.1. Centre Tecnologic de Telecomunicacions de Catalunya(CTTC)14
7. Acknowledgments ............................................ 15 7. Acknowledgments ............................................ 15
8. Security Considerations..................................... 15 8. Security Considerations..................................... 15
9. Contributors' Addresses..................................... 15 9. Contributors' Addresses..................................... 15
10. References ................................................ 16 10. References ................................................ 16
10.1. Normative References.................................. 16 10.1. Normative References.................................. 16
10.2. Informative References................................ 16 10.2. Informative References................................ 16
Authors' Addresses ............................................ 17
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 is selected from 12.5 GHz, 25 GHz, 50 GHz,
100 GHz and integer multiples of 100 GHz. But [G.694.1] also 100 GHz and integer multiples of 100 GHz. But [G.694.1] also
defines "flexible grids", also known as "flexi-grid". The terms defines "flexible grids", also known as "flexi-grid". The terms
"frequency slot" (i.e., the frequency range allocated to a specific "frequency slot" (i.e., the frequency range allocated to a specific
channel and unavailable to other channels within a flexible grid) channel and unavailable to other channels within a flexible grid)
and "slot width" (i.e., the full width of a frequency slot in a and "slot width" (i.e., the full width of a frequency slot in a
flexible grid) are used to define a flexible grid. flexible grid) are used to define a flexible grid.
[FLEX-FWK] 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 [WSON-OSPF] 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.
[FLEX-SIG] 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 [FLEX-SIG] 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 draft compliments 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 [FLEX-FWK] 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 [FLEX-FWK]. 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 range of
frequencies. The process of computing a route and the allocation of frequencies. The process of computing a route and the allocation of
a frequency slot is referred to as RSA (Routing and Spectrum a frequency slot is referred to as RSA (Routing and Spectrum
Assignment). [FLEX-FWK] describes three types of architectural Assignment). [RFC7698] describes three types of architectural
approaches to RSA: combined RSA; separated RSA; and distributed SA. approaches to RSA: combined RSA; separated RSA; and distributed SA.
The first two approaches among them could be called "centralized SA" The first two approaches among them could be called "centralized SA"
because the spectrum (frequency slot) assignment is performed by a because the spectrum (frequency slot) assignment is performed by a
single entity before the signaling procedure. 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
"Spectrum Continuity Constraint", as described in [FLEX-FWK]. "Spectrum Continuity Constraint", as described in [RFC7698].
The remainder of this section states the additional extensions on The remainder of this section states the additional extensions on
the routing protocols in a flexi-grid network. That is, the the routing protocols in a flexi-grid network. That is, the
additional information that must be collected and passed between additional information that must be collected and passed between
nodes in the network by the routing protocols in order to enable nodes in the network by the routing protocols in order to enable
correct path computation and signaling in support of LSPs within the correct path computation and signaling in support of LSPs within the
network. network.
3.1. Available Frequency Ranges 3.1. Available Frequency Ranges
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frequency of frequency slot 1 denoted by n=2 is the lowest frequency frequency of frequency slot 1 denoted by n=2 is the lowest frequency
of slot 2. In this example, it means that the frequency range from of slot 2. In this example, it means that the frequency range from
n=-2 to n=10 is occupied and is unavailable to other flexi-grid LSPs. n=-2 to n=10 is occupied and is unavailable to other flexi-grid LSPs.
Hence, in order to clearly show which LSPs can be supported and what Hence, in order to clearly show which LSPs can be supported and what
frequency slots are unavailable, the available frequency ranges MUST frequency slots are unavailable, the available frequency ranges MUST
be advertised by the routing protocol for the flexi-grid DWDM links. be advertised by the routing protocol for the flexi-grid DWDM links.
A set of non-overlapping available frequency ranges MUST be A set of non-overlapping available frequency ranges MUST be
disseminated in order to allow efficient resource management of disseminated in order to allow efficient resource management of
flexi-grid DWDM links and RSA procedures which are described in flexi-grid DWDM links and RSA procedures which are described in
Section 4.8 of [FLEX-FWK]. Section 4.8 of [RFC7698].
3.2. Application Compliance Considerations 3.2. Application Compliance Considerations
As described in [G.694.1], devices or applications that make use of As described in [G.694.1], devices or applications that make use of
the flexi-grid may not be capable of supporting every possible slot the flexi-grid may not be capable of supporting every possible slot
width or position (i.e., central frequency). In other words, width or position (i.e., central frequency). In other words,
applications or implementations may be defined where only a subset applications or implementations may be defined where only a subset
of the possible slot widths and positions are required to be of the possible slot widths and positions are required to be
supported. supported.
For example, an application could be defined where the nominal For example, an application could be defined where the nominal
central frequency granularity is 12.5 GHz (by only requiring values central frequency granularity is 12.5 GHz (by only requiring values
of n that are even) and that only requires slot widths as a multiple of n that are even) and that only requires slot widths as a multiple
of 25 GHz (by only requiring values of m that are even). of 25 GHz (by only requiring values of m that are even).
Hence, in order to support all possible applications and Hence, in order to support all possible applications and
implementations the following information should be advertised for a implementations the following information should be advertised for a
flexi-grid DWDM link: flexi-grid DWDM link:
o Chanel Spacing (C.S.): as defined in [FLEX-LBL] and for flexi- o Chanel Spacing (C.S.): as defined in [RFC7699] for flexi-grid, is
grid, is set to 5 to denote 6.25GHz. set to 5 to denote 6.25GHz.
o Central frequency granularity: a multiplier of C.S.. o Central frequency granularity: a multiplier of C.S..
o Slot width granularity: a multiplier of 2*C.S.. o Slot width granularity: a multiplier of 2*C.S..
o Slot width range: two multipliers of the slot width granularity, o Slot width range: two multipliers of the slot width granularity,
each indicate the minimal and maximal slot width supported by a each indicate the minimal and maximal slot width supported by a
port respectively. port respectively.
The combination of slot width range and slot width granularity can The combination of slot width range and slot width granularity can
skipping to change at page 7, line 15 skipping to change at page 7, line 15
Slot Width (GHz) = 12.5GHz * m Slot Width (GHz) = 12.5GHz * m
For this reason, the available frequency slot/ranges need to be For this reason, the available frequency slot/ranges need to be
advertised for a flexi-grid DWDM link instead of the specific advertised for a flexi-grid DWDM link instead of the specific
"wavelengths" points that are sufficient for a fixed-grid link. "wavelengths" points that are sufficient for a fixed-grid link.
Moreover, thus advertisement is represented by the combination of Moreover, thus advertisement is represented by the combination of
Central Frequency Granularity and Slot Width Granularity. Central Frequency Granularity and Slot Width Granularity.
4. Extensions 4. Extensions
As described in [FLEX-FWK], the network connectivity topology As described in [RFC7698], the network connectivity topology
constructed by the links/nodes and node capabilities are the same as constructed by the links/nodes and node capabilities are the same as
for WSON, and can be advertised by the GMPLS routing protocols for WSON, and can be advertised by the GMPLS routing protocols
(refer to section 6.2 of [RFC6163]). In the flexi-grid case, the (refer to section 6.2 of [RFC6163]). In the flexi-grid case, the
available frequency ranges instead of the specific "wavelengths" are available frequency ranges instead of the specific "wavelengths" are
advertised for the link. This section defines the GMPLS OSPF-TE advertised for the link. This section defines the GMPLS OSPF-TE
extensions in support of advertising the available frequency ranges extensions in support of advertising the available frequency ranges
for flexi-grid DWDM links. for flexi-grid DWDM links.
4.1. ISCD Extensions for Flexi-grid 4.1. ISCD Extensions for Flexi-grid
skipping to change at page 8, line 39 skipping to change at page 8, line 39
the rightmost bit representing priority level 7 (i.e., the the rightmost bit representing priority level 7 (i.e., the
lowest). A bit MUST be set (1) corresponding to each priority lowest). A bit MUST be set (1) corresponding to each priority
represented in the sub-TLV, and MUST NOT be set (0) when the represented in the sub-TLV, and MUST NOT be set (0) when the
corresponding priority is not represented. At least one priority corresponding priority is not represented. At least one priority
level MUST be advertised that, unless overridden by local policy, level MUST be advertised that, unless overridden by local policy,
SHALL be at priority level 0. SHALL be at priority level 0.
Max Slot Width (16 bits): This field indicates maximal frequency Max Slot Width (16 bits): This field indicates maximal frequency
slot width supported at a particular priority level. This field slot width supported at a particular priority level. This field
MUST be set to max frequency slot width supported in the unit of MUST be set to max frequency slot width supported in the unit of
2.C.S., for a particular priority level. One field MUST be present 2*C.S., for a particular priority level. One field MUST be present
for each bit set in the Priority field, and is ordered to match the for each bit set in the Priority field, and is ordered to match the
Priority field. Fields MUST NOT be present for priority levels that Priority field. Fields MUST NOT be present for priority levels that
are not indicated in the Priority field. are not indicated in the Priority field.
Unreserved Padding (16 bits): The Padding field is used to Unreserved Padding (16 bits): The Padding field is used to
ensure the 32 bit alignment of Max Slot Width fields. When ensure the 32 bit alignment of Max Slot Width fields. When
present the Unreserved Padding field is 16 bits (2 byte) long. present the Unreserved Padding field is 16 bits (2 byte) long.
When the number of priorities is odd, the Unreserved Padding field When the number of priorities is odd, the Unreserved Padding field
MUST be included. When the number of priorities is even, the MUST be included. When the number of priorities is even, the
Unreserved Padding MUST be omitted. Unreserved Padding MUST be omitted.
C.S. (4 bits): As defined in [FLEX-LBL] and it is currently set to 5. C.S. (4 bits): As defined in [RFC7699] and it is currently set to 5.
Starting n (16 bits): as defined in [FLEX-LBL] and this value Starting n (16 bits): as defined in [RFC7699] and this value denotes
denotes the starting nominal central frequency point of the the starting nominal central frequency point of the frequency
frequency availability bitmap sub-TLV. availability bitmap sub-TLV.
Number of Effective Bits (12 bits): Indicates the number of Number of Effective Bits (12 bits): Indicates the number of
effective bits in the Bit Map field. effective bits in the Bit Map field.
Bit Map (variable): Indicates whether a basic frequency slot, Bit Map (variable): Indicates whether a basic frequency slot,
characterized by a nominal central frequency and a fixed m value of characterized by a nominal central frequency and a fixed m value of
1, is available or not for flexi-grid LSP setup. The first nominal 1, is available or not for flexi-grid LSP setup. The first nominal
central frequency is the value of starting n and with the subsequent central frequency is the value of starting n and with the subsequent
ones implied by the position in the bitmap. Note that when setting ones implied by the position in the bitmap. Note that when setting
to 1, it means that the corresponding central frequency is available to 1, it means that the corresponding central frequency is available
for a flexi-grid LSP with m=1. Note that a centralized SA process for a flexi-grid LSP with m=1; and when setting to 0, it means the
will need to extend this to high values of m by checking a corresponding central frequency is unavailable. Note that a
sufficient large number of consecutive basic frequency slots that centralized SA process will need to extend this to high values of
are available. m by checking a sufficient large number of consecutive basic
frequency slots that are available.
Padding Bits (variable): Added after the Bit Map to make it a Padding Bits (variable): Padded after the Bit Map to make it a
multiple of four bytes if necessary. Padding bits MUST be set to 0 multiple of four bytes if necessary. Padding bits MUST be set to 0
and MUST be ignored on receipt. and MUST be ignored on receipt.
The Reserved field MUST be set to zero on transmission and SHOULD be The Reserved field MUST be set to zero on transmission and SHOULD be
ignored on receipt. ignored on receipt.
The starting n MAY be set to the lowest possible nominal central The starting n MAY be set to the lowest possible nominal central
frequency supported by the link. An example is provided in the next frequency supported by the link. An example is provided in section
section. 4.1.2.
4.1.2. An SCSI Example 4.1.2. An SCSI Example
Figure 3 shows an example of the available frequency spectrum Figure 3 shows an example of the available frequency spectrum
resource of a flexi-grid DWDM link. resource of a flexi-grid DWDM link.
-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
...+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--... ...+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--...
|--Available Frequency Range--| |--Available Frequency Range--|
skipping to change at page 10, line 31 skipping to change at page 10, line 31
| Max Slot Width at Priority 0 | ... ~ | Max Slot Width at Priority 0 | ... ~
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
~ Max Slot Width at Priority 7 | Unreserved padding | ~ Max Slot Width at Priority 7 | Unreserved padding |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| 5 | Starting n (-9) | No. of Effec. Bits(21)| | 5 | Starting n (-9) | No. of Effec. Bits(21)|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0|0|0|0|0|0|0|0|1|1|1|1|1|1|1|1|1|0|0|0|0| padding bits (0s) | |0|0|0|0|0|0|0|0|1|1|1|1|1|1|1|1|1|0|0|0|0| padding bits (0s) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
In the above example, the starting n is selected to be the lowest In the above example, the starting n is selected to be the lowest
nominal central frequency, i.e. -9. Note other starting n values can nominal central frequency, i.e. -9. It is observed from the bit map
be chosen and for example, the first available nominal central that n = -1 to 7 can be used to set up LSPs. Note other starting n
frequency (a.k.a., the first available basic frequency slot) can be values can be chosen to represent the bit map, for example, the
chosen and the SCSI will be expressed as the following: first available nominal central frequency (a.k.a., the first
available basic frequency slot) can be chosen and the SCSI will be
expressed as the 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 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Max Slot Width at Priority 0 | ... ~ | Max Slot Width at Priority 0 | ... ~
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
~ Max Slot Width at Priority 7 | Unreserved padding | ~ Max Slot Width at Priority 7 | Unreserved padding |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| 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 path computation use. 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) equal 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 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
skipping to change at page 12, line 37 skipping to change at page 12, line 37
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.
Switching Cap (Switching Capability, 8 bits): As defined in Switching Cap (Switching Capability, 8 bits): As defined in
[RFC7579], MUST be consistent with the one specified in ISCD as [RFC7579], MUST be consistent with the one specified in ISCD as
described in Section 4.1. described in Section 4.1.
Encoding (8 bits): As defined in [RFC7579], must be consistent with Encoding (8 bits): As defined in [RFC7579], must be consistent with
the one specified in ISCD as described in Section 4.1. the one specified in ISCD as described in Section 4.1.
C.S. (4 bits): As defined in [FLEX-LBL] and for flexi-grid is 5 to C.S. (4 bits): As defined in [RFC7699] and for flexi-grid is 5 to
denote 6.25GHz. denote 6.25GHz.
C.F.G (Central Frequency Granularity, 8 bits): A positive integer. C.F.G (Central Frequency Granularity, 8 bits): A positive integer.
Its value indicates the multiple of C.S., in terms of central Its value indicates the multiple of C.S., in terms of central
frequency granularity. frequency granularity.
S.W.G (Slot Width Granularity, 8 bits): A positive integer. Its S.W.G (Slot Width Granularity, 8 bits): A positive integer. Its
value indicates the multiple of 2*C.S., in terms of slot width value indicates the multiple of 2*C.S., in terms of slot width
granularity. granularity.
skipping to change at page 16, line 34 skipping to change at page 16, line 34
Networks", RFC 7579, June 2015. Networks", RFC 7579, June 2015.
[RFC7580] F. Zhang, Y. Lee, J. Han, G. Bernstein and Y. Xu, "OSPF-TE [RFC7580] F. Zhang, Y. Lee, J. Han, G. Bernstein and Y. Xu, "OSPF-TE
Extensions for General Network Element Constraints ", RFC Extensions for General Network Element Constraints ", RFC
7580, June 2015. 7580, June 2015.
[RFC6205] T. Otani and D. Li, "Generalized Labels for Lambda-Switch- [RFC6205] T. Otani and D. Li, "Generalized Labels for Lambda-Switch-
Capable (LSC) Label Switching Routers", RFC 6205, March Capable (LSC) Label Switching Routers", RFC 6205, March
2011. 2011.
[FLEX-LBL] King, D., Farrel, A. and Y. Li, "Generalized Labels for [RFC7699] King, D., Farrel, A. and Y. Li, "Generalized Labels for
the Flexi-Grid in Lambda Switch Capable (LSC) Label the Flexi-Grid in Lambda Switch Capable (LSC) Label
Switching Routers", draft-ietf-ccamp-flexigrid-lambda- Switching Routers", RFC7699, September 2015.
label, work in progress.
10.2. Informative References 10.2. Informative References
[RFC6163] Y. Lee, G. Bernstein and W. Imajuku, "Framework for GMPLS [RFC6163] Y. Lee, G. Bernstein and W. Imajuku, "Framework for GMPLS
and Path Computation Element (PCE) Control of Wavelength and Path Computation Element (PCE) Control of Wavelength
Switched Optical Networks (WSONs)", RFC 6163, April 2011. Switched Optical Networks (WSONs)", RFC 6163, April 2011.
[FLEX-SIG] F.Zhang et al, "RSVP-TE Signaling Extensions in support [RFC7792] F.Zhang et al, "RSVP-TE Signaling Extensions in support of
of Flexible-grid", draft-ietf-ccamp-flexible-grid-rsvp-te- Flexible-grid", RFC 7792, November 2015.
ext, work in progress.
[FLEX-FWK] Gonzalez de Dios, O., Casellas R., Zhang, F., Fu, X., [RFC7698] Gonzalez de Dios, O., Casellas R., Zhang, F., Fu, X.,
Ceccarelli, D., and I. Hussain, "Framework and Ceccarelli, D., and I. Hussain, "Framework and
Requirements for GMPLS based control of Flexi-grid DWDM Requirements for GMPLS based control of Flexi-grid DWDM
networks', draft-ietf-ccamp-flexi-grid-fwk, work in networks', RFC 7698, August 2015.
progress.
[WSON-OSPF] Y. Lee and G. Bernstein, "GMPLS OSPF Enhancement for [RFC7688] Y. Lee and G. Bernstein, "GMPLS OSPF Enhancement for
Signal and Network Element Compatibility for Wavelength Signal and Network Element Compatibility for Wavelength
Switched Optical Networks ", draft-ietf-ccamp-wson-signal- Switched Optical Networks ", RFC7688, August 2015.
compatibility-ospf, work in progress.
[RFC2328] Moy, J., "OSPF Version 2", STD 54, RFC 2328, April 1998. [RFC2328] Moy, J., "OSPF Version 2", STD 54, RFC 2328, April 1998.
[RFC6863] Hartman, S. and D. Zhang, "Analysis of OSPF Security [RFC6863] Hartman, S. and D. Zhang, "Analysis of OSPF Security
According to the Keying and Authentication for Routing According to the Keying and Authentication for Routing
Protocols (KARP) Design Guide", RFC 6863, March 2013. Protocols (KARP) Design Guide", RFC 6863, March 2013.
Authors' Addresses Authors' Addresses
Xian Zhang Xian Zhang
 End of changes. 35 change blocks. 
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