draft-ietf-ccamp-flexible-grid-ospf-ext-02.txt   draft-ietf-ccamp-flexible-grid-ospf-ext-03.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: December 17, 2015 June 17, 2015 Expires: April 13, 2016 October 16, 2015
GMPLS OSPF-TE Extensions in support of Flexible Grid GMPLS OSPF-TE Extensions in support of Flexi-grid DWDM networks
draft-ietf-ccamp-flexible-grid-ospf-ext-02.txt draft-ietf-ccamp-flexible-grid-ospf-ext-03.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
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progress." progress."
The list of current Internet-Drafts can be accessed at The list of current Internet-Drafts can be accessed at
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The list of Internet-Draft Shadow Directories can be accessed at The list of Internet-Draft Shadow Directories can be accessed at
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This Internet-Draft will expire on December 17, 2015. This Internet-Draft will expire on April 13, 2016.
Copyright Notice Copyright Notice
Copyright (c) 2013 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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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 for Flexi-grid ..................................... 7 4.1. ISCD Extensions for Flexi-grid ..........................7
4.2. Extensions to Port Label Restriction sub-TLV ............ 7 4.1.1. Switching Capability Specific Information (SCSI) .... 7
4.3. Available Resource sub-TLV .............................. 8 4.1.2. An SCSI Example.................................... 9
4.3.1. Inclusive/Exclusive Label Ranges ................... 9 4.2. Extensions to Port Label Restriction sub-TLV ...........12
4.3.2. Inclusive/Exclusive Label Lists .................... 9 5. IANA Considerations ........................................ 13
4.3.3. Bitmap Label Set ................................... 9 5.1. New Switching Type..................................... 13
4.4. Examples for Available Resource Sub-TLV ................ 10 5.2. New Sub-TLV ........................................... 13
5. IANA Considerations ........................................ 11 6. Implementation Status....................................... 13
6. Implementation Status ....................................... 11 6.1. Centre Tecnologic de Telecomunicacions de Catalunya (CTTC)14
6.1. Centre Tecnologic de Telecomunicacions de Catalunya (CTTC)12 7. Acknowledgments ............................................ 15
7. Acknowledgments ............................................ 13 8. Security Considerations..................................... 15
8. Security Considerations ..................................... 13 9. Contributors' Addresses..................................... 15
9. References ................................................. 13 10. References ................................................ 16
9.1. Normative References ................................... 13 10.1. Normative References.................................. 16
9.2. Informative References ................................. 13 10.2. Informative References................................ 16
10. Authors' Addresses ......................................... 15
11. Contributors' Addresses .................................... 15
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.
skipping to change at page 3, line 33 skipping to change at page 3, line 31
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 [WSON-OSPF] 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 [FLEX-SIG] 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 [FLEX-SIG] 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
Short Path First (OSPF) Traffic-Engineering (TE) protocol so as to
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 [FLEX-FWK] 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 [FLEX-FWK].
A flexi-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). [FLEX-FWK] 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 both routing and spectrum (frequency slot) assignment are because the spectrum (frequency slot) assignment is performed by a
performed by centralized 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 Path message during LSP setup. In the case of specified in the RSVP-TE Path message during the signaling process.
distributed SA, the slot width of the flexi-grid LSP is specified in In the case of distributed SA, only the requested slot width of the
the Path message, allowing the involved network elements to select flexi-grid LSP is specified in the Path message, allowing the
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 [FLEX-FWK].
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
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 flexi-LSP are defined in frequency and the frequency slot width of a frequency slot are
[G.694.1]. defined in [G.694.1], i.e., by using nominal central frequency n and
the slot width m.
On a DWDM link, the frequency slots must not overlap with each other. On a DWDM link, the allocated or in-use frequency slots must not
However, the border frequencies of two frequency slots may be the overlap with each other. However, the border frequencies of two
same frequency, i.e., the highest frequency of a frequency slot may frequency slots may be the same frequency, i.e., the highest
be the lowest frequency of the next frequency slot. frequency of a frequency slot may be the lowest frequency of the
next frequency slot.
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
Figure 1 - Two Frequency Slots on a Link Figure 1 - Two Frequency Slots on a Link
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 occupied and is unavailable to other flexi-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 frequency slots are unavailable, the available frequency ranges MUST
should be advertised by the routing protocol for the flexi-grid DWDM be advertised by the routing protocol for the flexi-grid DWDM links.
links. A set of non-overlapping available frequency ranges should A set of non-overlapping available frequency ranges MUST be
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 5.8 of [FLEX-FWK]. Section 4.8 of [FLEX-FWK].
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 Central frequency granularity: a multiplier of 6.25 GHz. o Chanel Spacing (C.S.): as defined in [FLEX-LBL] and for flexi-
grid, is set to 5 to denote 6.25GHz.
o Slot width granularity: a multiplier of 12.5 GHz. o Central frequency granularity: a multiplier of C.S..
o Slot width range: two multipliers of 12.5GHz, each indicate the o Slot width granularity: a multiplier of 2*C.S..
minimal and maximal slot width supported by a port respectively.
o Slot width range: two multipliers of the slot width granularity,
each indicate the minimal and maximal slot width supported by a
port respectively.
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 has the same frequency defined central frequency and each wavelength maps to a pre-defined
range (i.e., there is a uniform channel spacing). Hence all the central frequency and the usable frequency range is implicit by the
wavelengths on a DWDM link can be identified uniquely simply by channel spacing. All the wavelengths on a DWDM link can be
giving it an identifier (such as the central wavelength [RFC6205]), identified with an identifier that mainly convey its central
and the status of the wavelengths (available or not) can be frequency as the label defined in [RFC6205], and the status of the
advertised through a routing protocol. wavelengths (available or not) can be advertised through a routing
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) |
...---------+-----------+-----------+-----------+-----------+----... ...---------+-----------+-----------+-----------+-----------+----...
| 50 GHz | 50 GHz | 50 GHz | 50 GHz | | 50 GHz | 50 GHz | 50 GHz | 50 GHz |
n=-2 n=-1 n=0 n=1 n=2 n=-2 n=-1 n=0 n=1 n=2
...---+-----------+-----------+-----------+-----------+----------... ...---+-----------+-----------+-----------+-----------+----------...
^ ^
Central F = 193.1THz Central F = 193.1THz
Figure 2 - A Link Supports Fixed Wavelengths with 50 GHz Channel Figure 2 - A Link Supports Fixed Wavelengths with 50 GHz Channel
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 are 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 formula is uncertain before a That is, the value of m in the following formula [G.694.1] is
frequency slot is actually allocated. For this reason, the uncertain before a frequency slot is actually allocated for a flexi-
available frequency slot/ranges need to be advertised for a flexi- grid LSP.
grid DWDM link instead of the specific "wavelengths" that are
sufficient for a fixed-grid link. Moreover, thus advertisement is Slot Width (GHz) = 12.5GHz * m
represented by the combination of Central Frequency Granularity and
Slot Width Granularity. For this reason, the available frequency slot/ranges need to be
advertised for a flexi-grid DWDM link instead of the specific
"wavelengths" points that are sufficient for a fixed-grid link.
Moreover, thus advertisement is represented by the combination of
Central Frequency Granularity and Slot Width Granularity.
4. Extensions 4. Extensions
As described in [FLEX-FWK], the network connectivity topology As described in [FLEX-FWK], 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 for Flexi-grid 4.1. ISCD Extensions for Flexi-grid
Value Type Value Type
----- ---- ----- ----
152 (TBA by IANA) Flexi-Grid-LSC capable (DWDM-LSC) 152 (TBA by IANA) Flexi-Grid-LSC capable
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 When Switching Capability and Encoding fields are set to values as
as stated above, the Interface Switching Capability Descriptor MUST stated above, the Interface Switching Capability Descriptor MUST be
be 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.
The Max LSP Bandwidth can be calculated based on the Max Slot 4.1.1. Switching Capability Specific Information (SCSI)
Width defined in Available Resource sub-TLV in Section 4.3, together
with corresponding modulation schemes.
4.2. Extensions to Port Label Restriction sub-TLV
As described in Section 3.2, a port that supports flexi-grid may The technology specific part of the Flexi-grid ISCD should include
support only a restricted subset of the full flexible grid. The the available frequency spectrum resource as well as the max slot
Port Label Restriction sub-TLV is defined in [GEN-ENCODE]. It can widths per priority information. The format of this flex-grid SCSI,
be used to describe the label restrictions on a port. A new the frequency available bitmap TLV, is depicted in the following
restriction type, the flexi-grid Restriction Type, is defined here figure:
to specify 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 = TBA | Switching Cap | Encoding | | Type = 1 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| C.F.G | S.W.G | Min Slot Width | | Priority | Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Max Slot Width at Priority 0 | ... ~
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
~ Max Slot Width at Priority 7 | Unreserved padding |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| C.S. | Starting n | No. of Effective. Bits|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Bit Map ... ~
~ ... | padding bits ~
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
MatrixID (8 bits): As defined in [GEN-ENCODE]. Type (16 bits): The type of this sub-TLV and is set to 1.
RstType (Restriction Type, 8 bits): Takes the value (TBA) to Length (16 bits): The length of the value field of this sub-TLV.
indicate the restrictions on a port to support flexi-grid.
Switching Cap (Switching Capability, 8 bits): As defined in [GEN- Priority (8 bits): A bitmap used to indicate which priorities
ENCODE], must be consistent with the one specified in ISCD as are being advertised. The bitmap is in ascending order, with the
described in Section 4.1. leftmost bit representing priority level 0 (i.e., the highest) and
the rightmost bit representing priority level 7 (i.e., the
lowest). A bit MUST be set (1) corresponding to each priority
represented in the sub-TLV, and MUST NOT be set (0) when the
corresponding priority is not represented. At least one priority
level MUST be advertised that, unless overridden by local policy,
SHALL be at priority level 0.
Encoding (8 bits): As defined in [GEN-ENCODE], must be consistent Max Slot Width (16 bits): This field indicates maximal frequency
with the one specified in ISCD as described in Section 4.1. slot width supported at a particular priority level. This field
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
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
are not indicated in the Priority field.
C.F.G (Central Frequency Granularity, 8 bits): A positive integer. Unreserved Padding (16 bits): The Padding field is used to
Its value indicates the multiple of 6.25 GHz in terms of central ensure the 32 bit alignment of Max Slot Width fields. When
frequency granularity. present the Unreserved Padding field is 16 bits (2 byte) long.
When the number of priorities is odd, the Unreserved Padding field
MUST be included. When the number of priorities is even, the
Unreserved Padding MUST be omitted.
S.W.G (Slot Width Granularity, 8 bits): A positive integer. Its C.S. (4 bits): As defined in [FLEX-LBL] and it is currently set to 5.
value indicates the multiple of 12.5 GHz in terms of slot width
granularity.
Min Slot Width (16 bits): A positive integer. Its value indicates Starting n (16 bits): as defined in [FLEX-LBL] and this value
the multiple of 12.5 GHz in terms of the supported minimal slot denotes the starting nominal central frequency point of the
width. frequency availability bitmap sub-TLV.
4.3. Available Resource sub-TLV Number of Effective Bits (12 bits): Indicates the number of
effective bits in the Bit Map field.
The Available Resource sub-TLV is defined to support indicating the Bit Map (variable): Indicates whether a basic frequency slot,
flexi-grid label availability as follow: 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
central frequency is the value of starting n and with the subsequent
ones implied by the position in the bitmap. Note that when setting
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
will need to extend this to high values of m by checking a
sufficient large number of consecutive basic frequency slots that
are available.
0 1 2 3 Padding Bits (variable): Added after the Bit Map to make it a
multiple of four bytes if necessary. Padding bits MUST be set to 0
and MUST be ignored on receipt.
The Reserved field MUST be set to zero on transmission and SHOULD be
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 the next
section.
4.1.2. An SCSI Example
Figure 3 shows an example of the available frequency spectrum
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
...+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--...
|--Available Frequency Range--|
Figure 3 - Flexi-grid DWDM Link Example
The symbol "+" represents the allowed nominal central frequency. The
symbol "--" represents a central frequency granularity of 6.25 GHz,
as currently be standardized in [G.694.1]. The number on the top of
the line represents the "n" in the frequency calculation formula
(193.1 + n * 0.00625). The nominal central frequency is 193.1 THz
when n equals zero.
In this example, it is assumed that the lowest nominal central
frequency supported is n= -9 and the highest is n=11. Note they
cannot be used as a nominal central frequency for setting up a LSP,
but merely as the way to express the supported frequency range.
Using the encoding defined in Section 4.1.1, the relevant fields to
express the frequency resource availability can be filled as below:
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Pri | Max Slot Width | Reserved | | Type = 1 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Label Set Field | | Priority | Reserved |
: : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Max Slot Width at Priority 0 | ... ~
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
~ Max Slot Width at Priority 7 | Unreserved padding |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| 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) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Pri (priority flags): can be referred to Section 2.4 of [GEN-ENCODE]. 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
Max Slot Width (16 bits): A positive integer. Its value indicates be chosen and for example, the first available nominal central
the multiple of 12.5 GHz in terms of the supported maximal slot frequency (a.k.a., the first available basic frequency slot) can be
width. chosen and the SCSI will be expressed as the following:
Label Set Field: the definition of Label Set Field can be referred
to Section 2.6 of [GEN-ENCODE]. According to the possible action
value, the usage of Label Set Field is described as the following
sections, respectively.
4.3.1. Inclusive/Exclusive Label Ranges 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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type = 1 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Priority | Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Max Slot Width at Priority 0 | ... ~
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
~ Max Slot Width at Priority 7 | Unreserved padding |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| 5 | Starting n (-1) | No. of Effec. Bits(9)|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|1|1|1|1|1|1|1|1|1| padding bits (0s) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The inclusive/exclusive label ranges format of the Label Set Field This denotes that other than the advertised available nominal
defined in [GEN-ENCODE] can be used for specifying the frequency central frequencies, the other nominal central frequencies within
ranges of the flexi-grid DWDM links. the whole frequency range supported by the link are not available
for path computation use.
Note that multiple Available Resource sub-TLVs may be needed if If a LSP with slot width (m) equal to 1 is set up using this link,
there are multiple discontinuous frequency ranges on a link. say using n= -1, then the SCSI information is updated to be the
following:
4.3.2. Inclusive/Exclusive Label Lists 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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type = 1 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Priority | Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Max Slot Width at Priority 0 | ... ~
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
~ Max Slot Width at Priority 7 | Unreserved padding |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| 5 | Starting n (-1) | No. of Effec. Bits(9)|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0|0|1|1|1|1|1|1|1| padding bits (0s) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The inclusive/exclusive label lists format of Available Labels Set 4.2. Extensions to Port Label Restriction sub-TLV
sub-TLV defined in [GEN-ENCODE] can be used for specifying the
available central frequencies of flexi-grid DWDM links.
4.3.3. Bitmap Label Set As described in Section 3.2, a port that supports flexi-grid may
support only a restricted subset of the full flexible grid. The
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
the top-level Link TLV as specified in [RFC7580]. A new restriction
type, the flexi-grid Restriction Type, is defined here to specify
the restrictions on a port to support flexi-grid.
The bitmap format of Available Labels Set sub-TLV defined in [GEN- 0 1 2 3
ENCODE] can be used for specifying the available central frequencies 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
of the flexi-grid DWDM links +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| MatrixID | RstType = 5 | Switching Cap | Encoding |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| C.S. | C.F.G | S.W.G | Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Min Slot Width | Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Each bit in the bit map represents a particular central frequency MatrixID (8 bits): As defined in [RFC7579].
with a value of 1/0 indicating whether the central frequency is in
the set or not. Bit position zero represents the lowest central
frequency and corresponds to the base label, while each succeeding
bit position represents the next central frequency logically above
the previous.
Examples of the Available Resource sub-TLV can be found in Section RstType (Restriction Type, 8 bits): Takes the value of 5 to indicate
4.4. the restrictions on a port to support flexi-grid.
4.4. Examples for Available Resource Sub-TLV Switching Cap (Switching Capability, 8 bits): As defined in
[RFC7579], MUST be consistent with the one specified in ISCD as
described in Section 4.1.
Figure 3 shows an example of available frequency range of a flexi- Encoding (8 bits): As defined in [RFC7579], must be consistent with
grid DWDM link. the one specified in ISCD as described in Section 4.1.
-9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10 11 C.S. (4 bits): As defined in [FLEX-LBL] and for flexi-grid is 5 to
...+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--... denote 6.25GHz.
|--Available Frequency Range--|
Figure 3 - Flexi-grid DWDM Link C.F.G (Central Frequency Granularity, 8 bits): A positive integer.
Its value indicates the multiple of C.S., in terms of central
frequency granularity.
The symbol '+' represents the allowed nominal central frequency. The S.W.G (Slot Width Granularity, 8 bits): A positive integer. Its
symbol "--" represents a 6.25 GHz frequency unit. The number on the value indicates the multiple of 2*C.S., in terms of slot width
top of the line represents the 'n' in the frequency calculation granularity.
formula (193.1 + n * 0.00625). The nominal central frequency is
193.1 THz when n equals zero.
The usage of Action, Number of Labels and Length session of the Min Slot Width (16 bits): A positive integer. Its value indicates
Label set field can be referred to Section 2.6 in [GEN-ENCODE]. the multiple of 2*C.S. (GHz), in terms of the supported minimal slot
width.
Assume that the central frequency granularity is 6.25GHz, the label The Reserved field MUST be set to zero on transmission and SHOULD be
set can be encoded as follows: ignored on receipt.
Inclusive Label Range: 5. IANA Considerations
o Start Slot = -2; 5.1. New Switching Type
o End Slot = 8.
The available central frequencies (-1, 0, 1, 2, 3, 4, 5, 6, 7) can Upon approval of this document, IANA will make the assignment in the
be deduced by the Inclusive Label Range, because the Central "Switching Types" section of the "GMPLS Signaling Parameters"
Frequency Granularity is 6.25 GHz. registry located at http://www.iana.org/assignments/gmpls-sig-
parameters:
Inclusive Label Lists: Value Name Reference
o List Entry 1 = slot -1; --------- -------------------------- ----------
o List Entry 2 = slot 0;
o List Entry 3 = slot 1;
o List Entry 4 = slot 2;
o List Entry 5 = slot 3;
o List Entry 6 = slot 4;
o List Entry 7 = slot 5;
o List Entry 8 = slot 6;
o List Entry 9 = slot 7.
Bitmap: 152 (*) Flexi-Grid-LSC capable [This.I-D]
o Base Slot = -1; (*) Suggested value
o Bitmap = 111111111(padded out to a full multiple of 32 bits)
5. IANA Considerations 5.2. New Sub-TLV
[GEN-OSPF] defines the Port label Restriction sub-TLV of OSPF TE This document defines one new sub-TLV that are carried in the
Link TLV. It also creates a registry of values of the Restriction Interface Switching Capability Descriptors [RFC4203] with Signal
Type field of that sub-TLV Type Flexi-Grid-LSC capable.
IANA is requested to assign a new value from that registry as Upon approval of this document, IANA will create and maintain a new
follows: sub-registry, the "Types for sub-TLVs of Flexi-Grid-LSC capable SCSI
(Switch Capability-Specific Information)" registry under the "Open
Shortest Path First (OSPF) Traffic Engineering TLVs" registry, see
http://www.iana.org/assignments/ospf-traffic-eng-tlvs/ospf-traffic-
eng-tlvs.xml, with the sub-TLV types as follows:
Value Meaning Reference This document defines new sub-TLV types as follows:
TBD Flexi-grid restriction [This.I-D] Value Sub-TLV Reference
--------- -------------------------- ----------
0 Reserved [This.I-D]
1 Frequency availability bitmap [This.I-D]
6. Implementation Status 6. Implementation Status
[RFC Editor Note: Please remove this entire seciton 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
6982[RFC6982]. The description of implementations in this section 6982[RFC6982]. The description of implementations in this section
is intended to assist the IETF in its decision processes in is intended to assist the IETF in its decision processes in
progressing drafts to RFCs. Please note that the listing of any progressing drafts to RFCs. Please note that the listing of any
individual implementation here does not imply endorsement by the individual implementation here does not imply endorsement by the
IETF. Furthermore, no effort has been spent to verify the IETF. Furthermore, no effort has been spent to verify the
information presented here that was supplied by IETF contributors. information presented here that was supplied by IETF contributors.
This is not intended as, and must not be construed to be, a catalog This is not intended as, and must not be construed to be, a catalog
skipping to change at page 13, line 10 skipping to change at page 15, line 22
Contact Information: Ramon Casellas: ramon.casellas@cttc.es Contact Information: Ramon Casellas: ramon.casellas@cttc.es
Interoperability: No report. Interoperability: No report.
7. Acknowledgments 7. Acknowledgments
This work was supported in part by the FP-7 IDEALIST project under This work was supported in part by the FP-7 IDEALIST project under
grant agreement number 317999. grant agreement number 317999.
This work was supported in part by NSFC Project 61201260.
8. Security Considerations 8. Security Considerations
This document does not introduce any further security issues other This document extends [RFC4203] and [RFC7580] to carry flex-grid
than those discussed in [RFC3630], [RFC4203]. specific information in OSPF Opaque LSAs. This document does not
introduce any further security issues other than those discussed in
[RFC3630], [RFC4203]. To be more specific, the security mechanisms
described in [RFC2328] which apply to Opaque LSAs carried in OSPF
still apply. An analysis of the OSPF security is provided in
[RFC6863] and applies to the extensions to OSPF in this document as
well.
9. References 9. Contributors' Addresses
9.1. Normative References Adrian Farrel
Old Dog Consulting
Email: adrian@olddog.co.uk
Fatai Zhang
Huawei Technologies
Email: zhangfatai@huawei.com
Lei Wang,
ZTE
Email: wang.lei31@zte.com.cn
Guoying Zhang,
China Academy of Telecom Research
Email: zhangguoying@ritt.cn
10. 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
for WDM applications: DWDM frequency grid", February 2012. for WDM applications: DWDM frequency grid", February 2012.
[GEN-ENCODE] Bernstein, G., Lee, Y., Li, D., and W. Imajuku, [RFC7579] Bernstein, G., Lee, Y., Li, D., and W. Imajuku, "General
"General Network Element Constraint Encoding for GMPLS Network Element Constraint Encoding for GMPLS Controlled
Controlled Networks", draft-ietf-ccamp-general-constraint- Networks", RFC 7579, June 2015.
encode, work in progress.
[GEN-OSPF] Fatai Zhang, Y. Lee, Jianrui Han, G. Bernstein and Yunbin [RFC7580] F. Zhang, Y. Lee, J. Han, G. Bernstein and Y. Xu, "OSPF-TE
Xu, " OSPF-TE Extensions for General Network Element Extensions for General Network Element Constraints ", RFC
Constraints ", draft-ietf-ccamp-gmpls-general-constraints- 7580, June 2015.
ospf-te, work in progress.
[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 [FLEX-LBL] 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-farrkingel-ccamp-flexigrid- Switching Routers", draft-ietf-ccamp-flexigrid-lambda-
lambda-label, work in progress. label, work in progress.
9.2. 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 [FLEX-SIG] F.Zhang et al, "RSVP-TE Signaling Extensions in support
of Flexible-grid", draft-ietf-ccamp-flexible-grid-rsvp- of Flexible-grid", draft-ietf-ccamp-flexible-grid-rsvp-te-
te-ext, work in progress. ext, work in progress.
[FLEX-FWK] Gonzalez de Dios, O,, Casellas R., Zhang, F., Fu, X., [FLEX-FWK] 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', draft-ietf-ccamp-flexi-grid-fwk, work in
progress. progress.
[WSON-OSPF] Y. Lee and G. Bernstein, "GMPLS OSPF Enhancement for [WSON-OSPF] 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 ", draft-ietf-ccamp-wson-signal-
compatibility-ospf, work in progress. compatibility-ospf, work in progress.
10. Authors' Addresses [RFC2328] Moy, J., "OSPF Version 2", STD 54, RFC 2328, April 1998.
[RFC6863] Hartman, S. and D. Zhang, "Analysis of OSPF Security
According to the Keying and Authentication for Routing
Protocols (KARP) Design Guide", RFC 6863, March 2013.
Authors' Addresses
Xian Zhang Xian Zhang
Huawei Technologies Huawei Technologies
Email: zhang.xian@huawei.com Email: zhang.xian@huawei.com
Haomian Zheng Haomian Zheng
Huawei Technologies Huawei Technologies
Email: zhenghaomian@huawei.com Email: zhenghaomian@huawei.com
Ramon Casellas, Ph.D. Ramon Casellas, Ph.D.
skipping to change at page 15, line 35 skipping to change at line 748
Spain Spain
Phone: +34 913374013 Phone: +34 913374013
Email: ogondio@tid.es Email: ogondio@tid.es
Daniele Ceccarelli Daniele Ceccarelli
Ericsson Ericsson
Via A. Negrone 1/A Via A. Negrone 1/A
Genova - Sestri Ponente Genova - Sestri Ponente
Italy Italy
Email: daniele.ceccarelli@ericsson.com Email: daniele.ceccarelli@ericsson.com
11. Contributors' Addresses
Adrian Farrel
Old Dog Consulting
Email: adrian@olddog.co.uk
Fatai Zhang
Huawei Technologies
Email: zhangfatai@huawei.com
Lei Wang,
ZTE
Email: wang.lei31@zte.com.cn
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