draft-ietf-ccamp-flexible-grid-ospf-ext-07.txt   draft-ietf-ccamp-flexible-grid-ospf-ext-08.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 26, 2017 October 26, 2016 Expires: August 8, 2017 February 8, 2017
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-07.txt draft-ietf-ccamp-flexible-grid-ospf-ext-08.txt
Abstract Abstract
The International Telecommunication Union Telecommunication The International Telecommunication Union Telecommunication
Standardization Sector (ITU-T) has extended its Recommendations Standardization Sector (ITU-T) has extended its Recommendations
G.694.1 and G.872 to include a new Dense Wavelength Division G.694.1 and G.872 to include a new Dense Wavelength Division
Multiplexing (DWDM) grid by defining a set of nominal central Multiplexing (DWDM) grid by defining a set of nominal central
frequencies, channel spacings, and the concept of the "frequency frequencies, channel spacings, and the concept of the "frequency
slot". Corresponding techniques for data-plane connections are know slot". Corresponding techniques for data-plane connections are known
as flexi-grid. as flexi-grid.
Based on the characteristics of flexi-grid defined in G.694.1, RFC Based on the characteristics of flexi-grid defined in G.694.1, RFC
7698 and 7699, this document describes the OSPF-TE extensions in 7698 and 7699, this document describes the OSPF-TE extensions in
support of GMPLS control of networks that include devices that use support of GMPLS control of networks that include devices that use
the new flexible optical grid. 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
skipping to change at page 2, line 10 skipping to change at page 2, line 10
Internet-Drafts are draft documents valid for a maximum of six Internet-Drafts are draft documents valid for a maximum of six
months and may be updated, replaced, or obsoleted by other documents months and may be updated, replaced, or obsoleted by other documents
at any time. It is inappropriate to use Internet-Drafts as at any time. It is inappropriate to use Internet-Drafts as
reference material or to cite them other than as "work in progress." reference material or to cite them other than as "work in 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 26, 2017. This Internet-Draft will expire on August 8, 2017.
Copyright Notice Copyright Notice
Copyright (c) 2016 IETF Trust and the persons identified as the Copyright (c) 2017 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
(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
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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 ................................................. 3 1. Introduction ................................................ 3
2. Terminology .................................................. 3 2. Terminology ................................................. 3
2.1. Conventions Used in this Document ....................... 4 2.1. Conventions Used in this Document ....................... 4
3. Requirements for Flexi-grid Routing .......................... 4 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 ............................................ 14 5.2. New Sub-TLV ............................................ 13
6. Implementation Status ....................................... 14 6. Implementation Status ....................................... 14
6.1. Centre Tecnologic de Telecomunicacions de Catalunya (CTTC)15 6.1. Centre Tecnologic de Telecomunicacions de Catalunya (CTTC)14
7. Acknowledgments ............................................. 16 7. Acknowledgments ............................................. 15
8. Security Considerations ..................................... 16 8. Security Considerations ..................................... 15
9. Contributors' Addresses ..................................... 16 9. Contributors' Addresses ..................................... 16
10. References ................................................. 17 10. References ................................................. 16
10.1. Normative References .................................. 17 10.1. Normative References .................................. 16
10.2. Informative References ................................ 17 10.2. Informative References ................................ 17
Authors' Addresses ............................................. 18 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
skipping to change at page 4, line 37 skipping to change at page 4, line 37
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 [RFC7698]. "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.
additional information that must be collected and passed between
nodes in the network by the routing protocols in order to enable
correct path computation and signaling in support of LSPs within the
network.
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 do 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 upper bound of frequency slots may be the same frequency, i.e., the upper bound of
a frequency slot and the lower bound of the directly adjacent a frequency slot and the lower bound of the directly adjacent
frequency slot are the same. 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
...+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--... ...+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--...
skipping to change at page 5, line 32 skipping to change at page 5, line 27
Figure 1 shows two adjacent frequency slots on a link. The highest Figure 1 shows two adjacent frequency slots on a link. The highest
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 unavailable to other flexi-grid LSPs. Available n=-2 to n=10 is unavailable to other flexi-grid LSPs. Available
central frequencies are advertised for m=1, which means that for an central frequencies are advertised for m=1, which means that for an
available central frequency n, the frequency slot from central available central frequency n, the frequency slot from central
frequency n-1 to central frequency n+1 is available. frequency n-1 to central frequency n+1 is available.
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 are
be advertised by the routing protocol for the flexi-grid DWDM links. advertised by the routing protocol for the flexi-grid DWDM links. A
A set of non-overlapping available frequency ranges MUST be 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 [RFC7698]. 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
skipping to change at page 7, line 25 skipping to change at page 7, line 25
Spacing Spacing
Unlike the fixed-grid DWDM links, on a flexi-grid DWDM link the slot Unlike the fixed-grid DWDM links, on a flexi-grid DWDM link the slot
width of the frequency slot is flexible as described in section 3.1. width of the frequency slot is flexible as described in section 3.1.
That is, the value of m in the following formula [G.694.1] is That is, the value of m in the following formula [G.694.1] is
uncertain before a frequency slot is actually allocated for a flexi- uncertain before a frequency slot is actually allocated for a flexi-
grid LSP. grid LSP.
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 are advertised
advertised for a flexi-grid DWDM link instead of the specific for a flexi-grid DWDM link instead of the specific "wavelengths"
"wavelengths" points that are sufficient for a fixed-grid link. points that are sufficient for a fixed-grid link. Moreover, this
Moreover, thus advertisement is represented by the combination of advertisement is represented by the combination of Central Frequency
Central Frequency Granularity and Slot Width Granularity. Granularity and Slot Width Granularity.
4. Extensions 4. Extensions
As described in [RFC7698], 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
skipping to change at page 8, line 12 skipping to change at page 8, line 12
152 (TBA by IANA) Flexi-Grid-LSC 152 (TBA by IANA) Flexi-Grid-LSC
Switching Capability and Encoding values MUST be used as follows: Switching Capability and Encoding values MUST be used as follows:
Switching Capability = Flexi-Grid-LSC Switching Capability = Flexi-Grid-LSC
Encoding Type = lambda [as defined in RFC3471] Encoding Type = lambda [as defined in RFC3471]
When Switching Capability and Encoding fields are set to values as When Switching Capability and Encoding fields are set to values as
stated above, the Interface Switching Capability Descriptor MUST be stated above, the Interface Switching Capability Descriptor is
interpreted as in [RFC4203] with the optional inclusion of one or interpreted as in [RFC4203] with the optional inclusion of one or
more Switching Capability Specific Information sub-TLVs. more Switching Capability Specific Information sub-TLVs.
As the "Max LSP Bandwidth at priority x" (x from 0 to 7) fields in As the "Max LSP Bandwidth at priority x" (x from 0 to 7) fields in
the generic part of the Interface Switching Capability Descriptor the generic part of the Interface Switching Capability Descriptor
[RFC4203] are not meaningful for flexi-grid DWDM links, the values [RFC4203] are not meaningful for flexi-grid DWDM links, the values
of these fields MUST be set to zero and MUST be ignored. The of these fields MUST be set to zero and MUST be ignored. The
Switching Capability Specific Information (SCSI) as defined below Switching Capability Specific Information (SCSI) as defined below
provides the corresponding information for flexi-grid DWDM links. provides the corresponding information for flexi-grid DWDM links.
4.1.1. Switching Capability Specific Information (SCSI) 4.1.1. Switching Capability Specific Information (SCSI)
The technology specific part of the Flexi-grid ISCD should include The technology specific part of the Flexi-grid ISCD includes the
the available frequency spectrum resource as well as the max slot available frequency spectrum resource as well as the max slot widths
widths per priority information. The format of this flex-grid SCSI, per priority information. The format of this flex-grid SCSI, the
the frequency available bitmap TLV, is depicted in the following frequency available bitmap TLV, is depicted in the following figure:
figure:
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 k | Unreserved padding ~
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
~ Max Slot Width at Priority 7 | Unreserved padding |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| C.S. | Starting n | No. of Effective. Bits| | C.S. | Starting n | No. of Effective. Bits|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Bit Map ... ~ | Bit Map ... ~
~ ... | padding bits ~ ~ ... | padding bits ~
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Type (16 bits): The type of this sub-TLV and is set to 1. Type (16 bits): The type of this sub-TLV and is set to 1.
Length (16 bits): The length of the value field of this sub-TLV. Length (16 bits): The length of the value field of this sub-TLV, in
octets.
Priority (8 bits): A bitmap used to indicate which priorities Priority (8 bits): A bitmap used to indicate which priorities
are being advertised. The bitmap is in ascending order, with the are being advertised. The bitmap is in ascending order, with the
leftmost bit representing priority level 0 (i.e., the highest) and leftmost bit representing priority level 0 (i.e., the highest) and
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 is 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 clear (0) for each priority not
corresponding priority is not represented. At least one priority represented in the sub-TLV. At least one priority level MUST be
level MUST be advertised that, unless overridden by local policy, advertised, if only one priority level is advertised, it MUST be
SHALL be at priority level 0. at priority level 0.
Max Slot Width (16 bits): This field indicates maximal frequency The Reserved field MUST be set to zero on transmission and MUST be
slot width supported at a particular priority level. This field ignored on receipt.
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 Max Slot Width at priority k(16 bits): This field indicates maximal
for each bit set in the Priority field, and is ordered to match the frequency slot width supported at a particular priority level, up to
Priority field. Fields MUST NOT be present for priority levels that 8. This field is set to max frequency slot width supported in the
are not indicated in the Priority field. unit of 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 Priority field. Fields MUST be present for priority
levels that are 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. 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. This field MUST be set to 0 and
MUST be ignored on receipt.
C.S. (4 bits): As defined in [RFC7699] 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 [RFC7699] and this value denotes Starting n (16 bits): as defined in [RFC7699] and this value denotes
the starting nominal central frequency point of the frequency the starting nominal central frequency point of the 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.
skipping to change at page 10, line 9 skipping to change at page 10, line 11
for a flexi-grid LSP with m=1; and when setting to 0, it means the for a flexi-grid LSP with m=1; and when setting to 0, it means the
corresponding central frequency is unavailable. Note that a corresponding central frequency is unavailable. Note that a
centralized SA process will need to extend this to high values of m centralized SA process will need to extend this to high values of m
by checking a sufficient large number of consecutive basic frequency by checking a sufficient large number of consecutive basic frequency
slots that are available. slots that are available.
Padding Bits (variable): Padded 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 An example is provided in section 4.1.2.
ignored on receipt.
The starting n MAY be set to the lowest possible nominal central
frequency supported by the link. An example is provided in 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 11, line 12 skipping to change at page 10, line 45
Using the encoding defined in Section 4.1.1, the relevant fields to Using the encoding defined in Section 4.1.1, the relevant fields to
express the frequency resource availability can be filled as below: express the frequency resource availability can be filled as below:
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 k | 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. It is observed from the bit map nominal central frequency, i.e. -9. It is observed from the bit map
that n = -1 to 7 can be used to set up LSPs. Note other starting n that n = -1 to 7 can be used to set up LSPs. Note other starting n
values can be chosen to represent the bit map, for example, the values can be chosen to represent the bit map, for example, the
skipping to change at page 11, line 36 skipping to change at page 11, line 21
available basic frequency slot) can be chosen and the SCSI will be available basic frequency slot) can be chosen and the SCSI will be
expressed as the following: 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 k | 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 flexi-grid LSP set up. for flexi-grid LSP set up.
skipping to change at page 12, line 21 skipping to change at page 12, line 12
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 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Max Slot Width at Priority 0 | ... ~ ~ Max Slot Width at Priority k | 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)|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0|0|1|1|1|1|1|1|1| padding bits (0s) | |0|0|1|1|1|1|1|1|1| padding bits (0s) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
4.2. Extensions to Port Label Restriction sub-TLV 4.2. Extensions to Port Label Restriction sub-TLV
As described in Section 3.2, a port that supports flexi-grid may As described in Section 3.2, a port that supports flexi-grid may
support only a restricted subset of the full flexible grid. The support only a restricted subset of the full flexible grid. The
skipping to change at page 13, line 24 skipping to change at page 12, line 48
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.
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 [RFC7699] 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
 End of changes. 28 change blocks. 
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