Network Working Group G. Bernstein
Internet Draft Grotto Networking
Intended status: Standards Track Y. Lee
Expires: April 2010 D. Li
Huawei
W. Imajuku
NTT
October 8, 2009
Routing and Wavelength Assignment Information Encoding for
Wavelength Switched Optical Networks
draft-ietf-ccamp-rwa-wson-encode-03.txt
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Abstract
A wavelength switched optical network (WSON) requires that certain
key information elements are made available to facilitate path
computation and the establishment of label switching paths (LSPs).
The information model described in "Routing and Wavelength Assignment
Information for Wavelength Switched Optical Networks" shows what
information is required at specific points in the WSON.
The information may be used in Generalized Multiprotocol Label
Switching (GMPLS) signaling protocols, and may be distributed by
GMPLS routing protocols. Other distribution mechanisms (for example,
XML-based protocols) may also be used.
This document provides efficient, protocol-agnostic encodings for the
information elements necessary to operate a WSON. It is intended that
protocol-specific documents will reference this memo to describe how
information is carried for specific uses.
Conventions used in this document
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC-2119 [RFC2119].
Table of Contents
1. Introduction...................................................3
1.1. Revision History..........................................4
1.1.1. Changes from 00 draft................................4
1.1.2. Changes from 01 draft................................4
1.1.3. Changes from 02 draft................................4
2. Terminology....................................................5
3. Common Field Encoding..........................................5
3.1. Link Set Field............................................5
3.2. Wavelength Information Encoding...........................7
3.3. Wavelength Set Field......................................8
3.3.1. Inclusive/Exclusive Wavelength Lists.................9
3.3.2. Inclusive/Exclusive Wavelength Ranges................9
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3.3.3. Bitmap Wavelength Set...............................10
4. Wavelength and Connectivity sub-TLV Encodings.................11
4.1. Available Wavelengths Sub-TLV............................11
4.2. Shared Backup Wavelengths Sub-TLV........................11
4.3. Connectivity Matrix Sub-TLV..............................11
4.4. Port Wavelength Restriction sub-TLV......................13
4.4.1. SIMPLE_WAVELENGTH...................................14
4.4.2. CHANNEL_COUNT.......................................14
4.4.3. WAVEBAND1...........................................14
4.4.4. SIMPLE_WAVELENGTH & CHANNEL_COUNT...................15
5. Wavelength Converter Pool Encoding............................15
5.1. Wavelength Converter Set Field...........................16
5.2. Wavelength Converter Accessibility Sub-TLV...............17
5.3. Wavelength Conversion Range Sub-TLV......................18
5.4. Wavelength Converter Usage State Sub-TLV.................19
6. WSON Encoding Usage Recommendations...........................20
6.1. WSON Node TLV............................................20
6.2. WSON Dynamic Node TLV....................................20
6.3. WSON Link TLV............................................21
6.4. WSON Dynamic Link TLV....................................21
7. Security Considerations.......................................21
8. IANA Considerations...........................................21
9. Acknowledgments...............................................21
APPENDIX A: Encoding Examples....................................22
A.1. Link Set Field...........................................22
A.2. Wavelength Set Field.....................................22
A.3. Connectivity Matrix Sub-TLV..............................23
A.4. Connectivity Matrix with Bi-directional Symmetry.........26
A.5. Wavelength Converter Accessibility Sub-TLV...............28
A.6. Wavelength Conversion Range Sub-TLV......................30
10. References...................................................32
10.1. Normative References....................................32
10.2. Informative References..................................32
11. Contributors.................................................34
Authors' Addresses...............................................34
Intellectual Property Statement..................................35
Disclaimer of Validity...........................................36
1. Introduction
A Wavelength Switched Optical Network (WSON) is a Wavelength Division
Multiplexing (WDM) optical network in which switching is performed
selectively based on the center wavelength of an optical signal.
[WSON-Frame] describes a framework for Generalized Multiprotocol
Label Switching (GMPLS) and Path Computation Element (PCE) control of
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a WSON. Based on this framework, [WSON-Info] describes an information
model that specifies what information is needed at various points in
a WSON in order to compute paths and establish Label Switched Paths
(LSPs).
This document provides efficient encodings of information needed by
the routing and wavelength assignment (RWA) process in a WSON. Such
encodings can be used to extend GMPLS signaling and routing
protocols. In addition these encodings could be used by other
mechanisms to convey this same information to a path computation
element (PCE). Note that since these encodings are relatively
efficient they can provide more accurate analysis of the control
plane communications/processing load for WSONs looking to utilize a
GMPLS control plane.
1.1. Revision History
1.1.1. Changes from 00 draft
Edits to make consistent with update to [Otani], i.e., removal of
sign bit.
Clarification of TBD on connection matrix type and possibly
numbering.
New sections for wavelength converter pool encoding: Wavelength
Converter Set Sub-TLV, Wavelength Converter Accessibility Sub-TLV,
Wavelength Conversion Range Sub-TLV, WC Usage State Sub-TLV.
Added optional wavelength converter pool TLVs to the composite node
TLV.
1.1.2. Changes from 01 draft
The encoding examples have been moved to an appendix. Classified and
corrected information elements as either reusable fields or sub-TLVs.
Updated Port Wavelength Restriction sub-TLV. Added available
wavelength and shared backup wavelength sub-TLVs. Changed the title
and scope of section 6 to recommendations since the higher level TLVs
that this encoding will be used in is somewhat protocol specific.
1.1.3. Changes from 02 draft
Removed inconsistent text concerning link local identifiers and the
link set field in section 3.1.
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Added E bit to the Wavelength Converter Set Field.
Added bidirectional connectivity matrix example. Added simple link
set example. Edited examples for consistency.
2. Terminology
CWDM: Coarse Wavelength Division Multiplexing.
DWDM: Dense Wavelength Division Multiplexing.
FOADM: Fixed Optical Add/Drop Multiplexer.
ROADM: Reconfigurable Optical Add/Drop Multiplexer. A reduced port
count wavelength selective switching element featuring ingress and
egress line side ports as well as add/drop side ports.
RWA: Routing and Wavelength Assignment.
Wavelength Conversion. The process of converting an information
bearing optical signal centered at a given wavelength to one with
"equivalent" content centered at a different wavelength. Wavelength
conversion can be implemented via an optical-electronic-optical (OEO)
process or via a strictly optical process.
WDM: Wavelength Division Multiplexing.
Wavelength Switched Optical Network (WSON): A WDM based optical
network in which switching is performed selectively based on the
center wavelength of an optical signal.
3. Common Field Encoding
In encoding WSON information both sets of links and sets of
wavelengths frequently arise. In the following we specify the
encoding of these repeatedly used fields.
3.1. Link Set Field
We will frequently need to describe properties of groups of links. To
do so efficiently we can make use of a link set concept similar to
the label set concept of [RFC3471]. The information carried in a Link
Set is defined by:
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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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Action |Dir| Format | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link Identifier 1 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
: : :
: : :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link Identifier N |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Action: 8 bits
0 - Inclusive List
Indicates that one or more link identifiers are included in the Link
Set. Each identifies a separate link that is part of the set.
1 - Inclusive Range
Indicates that the Link Set defines a range of links. It contains
two link identifiers. The first identifiers indicates the start of
the range (inclusive). The second identifiers indicates the end of
the range (inclusive). All links with numeric values between the
bounds are considered to be part of the set. A value of zero in
either position indicates that there is no bound on the corresponding
portion of the range. Note that the Action field can be set to
0x02(Inclusive Range) only when unnumbered link identifier is used.
Dir: Directionality of the Link Set (2 bits)
0 -- bidirectional
1 -- ingress
2 -- egress
In optical networks we think in terms of unidirectional as well as
bidirectional links. For example, wavelength restrictions or
connectivity may be different for an ingress port, than for its
"companion" egress port if one exists. Note that "interfaces" such as
those discussed in the Interfaces MIB [RFC2863] are assumed to be
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bidirectional. This also applies to the links advertised in various
link state routing protocols.
Format: The format of the link identifier (6 bits)
0 -- Link Local Identifier
Indicates that the links in the Link Set are identified by link local
identifiers. All link local identifiers are supplied in the context
of the advertising node.
1 -- Local Interface IPv4 Address
2 -- Local Interface IPv6 Address
Indicates that the links in the Link Set are identified by Local
Interface IP Address. All Local Interface IP Address are supplied in
the context of the advertising node.
Others TBD.
Note that all link identifiers in the same list must be of the same
type.
Length: 16 bits
This field indicates the total length in bytes of the Link Set field.
Link Identifier: length is dependent on the link format
The link identifier represents the port which is being described
either for connectivity or wavelength restrictions. This can be the
link local identifier of [RFC4202], GMPLS routing, [RFC4203] GMPLS
OSPF routing, and [RFC5307] IS-IS GMPLS routing. The use of the link
local identifier format can result in more compact WSON encodings
when the assignments are done in a reasonable fashion.
3.2. Wavelength Information Encoding
This document makes frequent use of the lambda label format defined
in [Otani] shown below strictly for reference purposes:
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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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|Grid | C.S. | Reserved | n |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Where
Grid is used to indicate which ITU-T grid specification is being
used.
C.S. = Channel spacing used in a DWDM system, i.e., with an ITU-T
G.694.1 grid.
n = Used to specify the frequency as 193.1THz +/- n*(channel spacing)
and n is a two's complement integer that takes either a negative,
zero or a positive value.
3.3. Wavelength Set Field
Wavelength sets come up frequently in WSONs to describe the range of
a laser transmitter, the wavelength restrictions on ROADM ports, or
the availability of wavelengths on a DWDM link. The general format
for a wavelength set is given below. This format uses the Action
concept from [RFC3471] with an additional Action to define a "bit
map" type of label set. Note that the second 32 bit field is a lambda
label in the previously defined format. This provides important
information on the WDM grid type and channel spacing that will be
used in the compact encodings listed.
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Action| Num Wavelengths | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|Grid | C.S. | Reserved | n for lowest frequency |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Additional fields as necessary per action |
|
Action:
0 - Inclusive List
1 - Exclusive List
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2 - Inclusive Range
3 - Exclusive Range
4 - Bitmap Set
Length is the length in bytes of the entire field.
3.3.1. Inclusive/Exclusive Wavelength Lists
In the case of the inclusive/exclusive lists the wavelength set
format is given by:
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 or 1 | Num Wavelengths | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|Grid | C.S. | Reserved | n for lowest frequency |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| n2 | n3 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
: :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| nm | |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Where:
Num Wavelengths tells us the number of wavelength in this inclusive
or exclusive list including the initial wavelength in the list. Hence
if the number of wavelengths is even then zero padding of the last
half word is required.
n2 - nm, are used to specify the frequency as 193.1THz +/- n*(channel
spacing) and is a two's complement integer. Note that the channel
spacing is given by C.S. and is the same for all frequencies on the
list.
3.3.2. Inclusive/Exclusive Wavelength Ranges
In the case of inclusive/exclusive ranges the wavelength set format
is given by:
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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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|2 or 3 | Num Wavelengths | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|Grid | C.S. | Reserved | n for lowest frequency |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
In this case Num Wavelengths specifies the number of wavelengths in
the range starting at the given wavelength and incrementing the Num
Wavelengths number of channel spacing up in frequency.
3.3.3. Bitmap Wavelength Set
In the case of Action = 4, the bitmap the wavelength set format is
given by:
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| 4 | Num Wavelengths | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|Grid | C.S. | Reserved | n for lowest frequency |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Bit Map Word #1 (Lowest frequency channels) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
: :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Bit Map Word #N (Highest frequency channels) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Where Num Wavelengths in this case tells us the number of wavelengths
represented by the bit map. Each bit in the bit map represents a
particular frequency with a value of 1/0 indicating whether the
frequency is in the set or not. Bit position zero represents the
lowest frequency, while each succeeding bit position represents the
next frequency a channel spacing (C.S.) above the previous.
The size of the bit map is Num Wavelengths bits, but the bit map is
padded out to a full multiple of 32 bits so that the TLV is a
multiple of four bytes. Bits that do not represent wavelengths (i.e.,
those in positions (Num Wavelengths) and beyond SHOULD be set to zero
and MUST be ignored.
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4. Wavelength and Connectivity sub-TLV Encodings
A type-length-value (TLV) encoding of the high level WSON information
model [WSON-Info] is given in the following sections. This encoding
is designed to be suitable for use in the GMPLS routing protocols
OSPF [RFC4203] and IS-IS [RFC5307] and in the PCE protocol PCEP
[PCEP]. Note that the information distributed in [RFC4203] and
[RFC5307] is arranged via the nesting of sub-TLVs within TLVs and
this document makes use of such constructs.
4.1. Available Wavelengths Sub-TLV
To indicate the wavelengths available for use on a link the Available
Wavelengths sub-TLV consists of a single variable length wavelength
set field as follows:
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Wavelength Set Field |
: :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
4.2. Shared Backup Wavelengths Sub-TLV
To indicate the wavelengths available for shared backup use on a link
the Shared Backup Wavelengths sub-TLV consists of a single variable
length wavelength set field as follows:
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Wavelength Set Field |
: :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
4.3. Connectivity Matrix Sub-TLV
The switch and fixed connectivity matrices of [WSON-Info] can be
compactly represented in terms of a minimal list of ingress and
egress port set pairs that have mutual connectivity. As described in
[Switch] such a minimal list representation leads naturally to a
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graph representation for path computation purposes that involves the
fewest additional nodes and links.
A TLV encoding of this list of link set pairs is:
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Connectivity | MatrixID | Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link Set A #1 |
: : :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link Set B #1 :
: : :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Additional Link set pairs as needed |
: to specify connectivity :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Where
Connectivity is the device type.
0 -- the device is fixed
1 -- the device is switched(e.g., ROADM/OXC)
MatrixID represents the ID of the connectivity matrix and is an 8 bit
integer. The value of 0xFF is reserved for use with port wavelength
constraints and should not be used to identify a connectivity matrix.
There are two permitted combinations for the link set field parameter
"dir" for Link Set A and B pairs:
o Link Set A dir=ingress, Link Set B dir=egress
In this case any signal on the ingress links in set A can be
potentially switched out of an egress link in set B.
o Link Set A dir=bidirectional, Link Set B dir=bidirectional
In this case any ingress signal on the links in set A can
potentially egress on a link in set B, and any ingress signal on
the links in set B can potentially egress on a link in set A.
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See Appendix A for examples of both types of encodings.
4.4. Port Wavelength Restriction sub-TLV
The port wavelength restriction of [WSON-Info] can be encoded as a
sub-TLV as follows. More than one of these sub-TLVs may be needed to
fully specify a complex port constraint. When more than one of these
sub-TLVs are present the resulting restriction is the intersection of
the restrictions expressed in each sub-TLV. To indicate that a
restriction applies to the port in general and not to a specific
connectivity matrix use the reserved value of 0xFF for the MatrixID.
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| MatrixID | RestrictionType | Reserved/Parameter |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Additional Restriction Parameters per RestrictionType |
: :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Where:
MatrixID: either is the value in the corresponding Connectivity
Matrix sub-TLV or takes the value OxFF to indicate the restriction
applies to the port regardless of any Connectivity Matrix.
RestrictionType can take the following values and meanings:
0: SIMPLE_WAVELENGTH (Simple wavelength selective restriction)
1: CHANNEL_COUNT (Channel count restriction)
2: WAVEBAND1 (Waveband device with a tunable center frequency
and passband)
3: SIMPLE_WAVELENGTH & CHANNEL_COUNT (Combination of
SIMPLE_WAVELENGTH and CHANNEL_COUNT restriction. The
accompanying wavelength set and channel count indicate
wavelength permitted on the port and the maximum number of
channels that can be simultaneously used on the port)
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4.4.1. SIMPLE_WAVELENGTH
In the case of the SIMPLE_WAVELENGTH the GeneralPortRestrictions (or
MatrixSpecificRestrictions) format is given by:
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| MatrixID | RstType = 0 | Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Wavelength Set Field |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
In this case the accompanying wavelength set indicates the
wavelengths permitted on the port.
4.4.2. CHANNEL_COUNT
In the case of the CHANNEL_COUNT the format is given by:
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| MatrixID | RstType = 1 | MaxNumChannels |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
In this case the accompanying MaxNumChannels indicates the maximum
number of channels that can be simultaneously used on the
port/matrix.
4.4.3. WAVEBAND1
In the case of the WAVEBAND1 the GeneralPortRestrictions (or
MatrixSpecificRestrictions) format is given by:
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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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| MatrixID | RstType = 2 | MaxWaveBandWidth |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Wavelength Set |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
In this case the accompanying MaxWaveBandWidth indicates the maximum
width of the waveband in terms of the channels spacing given in the
wavelength set. The corresponding wavelength set is used to indicate
the overall tuning range. Specific center frequency tuning
information can be obtained from dynamic channel in use information.
It is assumed that both center frequency and bandwidth (Q) tuning can
be done without causing faults in existing signals.
4.4.4. SIMPLE_WAVELENGTH & CHANNEL_COUNT
In the case of the SIMPLE_WAVELENGTH & CHANNEL_COUNT the format is
given by:
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| MatrixInfo | RstType = 3 | MaxNumChannels |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Wavelength Set Field |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
In this case the accompanying wavelength set and MaxNumChannels
indicate wavelength permitted on the port and the maximum number of
channels that can be simultaneously used on the port.
5. Wavelength Converter Pool Encoding
The encoding of structure and properties of a general wavelength
converter pool utilizes a converter accessibility sub-TLV, a
wavelength converter range sub-TLV, and a wavelength converter state
sub-TLV. All these sub-TLVs make use of the wavelength converter set
field.
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5.1. Wavelength Converter Set Field
A WSON node may include a set of wavelength converters (WC) and such
information frequently is used in describing the wavelength converter
pool and its properties. The WC Set field is defined in a similar
manner to the label set concept of [RFC3471].
The information carried in a WC set field is defined by:
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Action |E| Reserved | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| WC Identifier 1 | WC Identifier 2 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
: : :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| WC Identifier n-1 | WC Identifier n |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Action: 8 bits
0 - Inclusive List
Indicates that the TLV contains one or more WC elements that are
included in the list.
2 - Inclusive Range
Indicates that the TLV contains a range of WCs. The object/TLV
contains two WC elements. The first element indicates the start of
the range. The second element indicates the end of the range. A value
of zero indicates that there is no bound on the corresponding portion
of the range.
E (Even bit): Set to 0 denotes an odd number of WC identifiers in
the list (last entry zero pad); Set to 1 denotes an even number of WC
identifiers in the list (no zero padding).
Reserved: 7 bits
This field is reserved. It MUST be set to zero on transmission and
MUST be ignored on receipt.
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Length: 16 bits
The total length of this field in bytes.
WC Identifier:
The WC identifier represents the ID of the wavelength convertor which
is a 16 bit integer.
5.2. Wavelength Converter Accessibility Sub-TLV
This sub-TLV describes the structure of the wavelength converter pool
in relation to the switching device. In particular it gives the
ability of an ingress port to reach a wavelength converter and of a
wavelength converter to reach a particular egress port. This is the
PoolIngressMatrix and PoolEgressMatrix of [WSON-Info].
The wavelength converter accessibility sub-TLV is defined by:
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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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Ingress Link Set Field A #1 |
: :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| WC Set Field A #1 |
: :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Additional Link set and WC set pairs as needed to |
: specify PoolIngressMatrix :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| WC Set B Field #1 (for egress connectivity) |
: :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Egress link Set Field B #1 |
: :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Additional WC set and egress link set pairs |
: as needed to specify PoolEgressMatrix :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Note that the direction parameter within the Link Set Field is used
to indicate whether the link set is an ingress or egress link set,
and the bidirectional value for this parameter is not permitted in
this sub-TLV.
5.3. Wavelength Conversion Range Sub-TLV
Wavelength converters may have a limited input or output range.
Additionally, due to the structure of the optical system not all
wavelengths can necessarily reach or leave all the converters. These
properties are described by using one or more wavelength conversion
sub-TLVs as defined below:
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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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| WC Set Field |
: :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Input Wavelength Set Field |
: :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Output Wavelength Set Field |
: :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
WC Set Field:
A set of wavelength converters (WCs) which have the same conversion
range.
Input Wavelength Set Field:
Indicates the wavelength input range of the WCs in the corresponding
WC set.
Output Wavelength Set Field:
Indicates the wavelength output range of WCs in the corresponding WC
set.
5.4. Wavelength Converter Usage State Sub-TLV
The usage state of a wavelength converter is encoded as a bit map
indicating whether the converter is available or in use. This
information can be relatively dynamic, i.e., can change when a
connection is established or torn down. This bit map is in
correspondence with a wavelength converter set as follows:
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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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| WC Set Field |
: :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| WC Usage state bitmap |
: :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| ...... | Padding bits |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
WC Usage state: Variable Length but must be a multiple of 4 byes.
Each bit indicates the usage status of one WC with 0 indicating the
WC is available and 1 indicating the WC is in used. The sequence of
the bit map is ordered according to the WC Set field with this sub-
TLV.
Padding bits: Variable Length
6. WSON Encoding Usage Recommendations
In this section we give recommendations of typical usage of the
previously defined sub-TLVs. Typically the sub-TLVs defined in the
preceding sections would be incorporated into some kind of composite
TLV. The example composite TLVs in the following sections are based
on the four high level information bundles of [WSON-Info].
6.1. WSON Node TLV
The WSON Node TLV could consist of the following list of sub-TLVs:
<Node_Info> ::= <Node_ID>[Other GMPLS sub-
TLVs][<ConnectivityMatrix>...]
[<WavelengthConverterPool>][<WCPoolState>]
6.2. WSON Dynamic Node TLV
If the protocol supports the separation of dynamic information from
relatively static information then the wavelength converter pool
state can be separated from the general Node TLV into a dynamic Node
TLV as follows.
<NodeInfoDynamic> ::= <NodeID> [<WCPoolState>]
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Note that currently the only dynamic information modeled with a node
is associated with the status of the wavelength converter pool.
6.3. WSON Link TLV
The new link related sub-TLVs could be incorporated into a composite
link TLV as follows:
<LinkInfo> ::= <LinkID> [Other GMPLS sub-TLVs]
[<PortWavelengthRestriction>...][<AvailableWavelengths>]
[<SharedBackupWavelengths>]
6.4. WSON Dynamic Link TLV
If the protocol supports the separation of dynamic information from
relatively static information then the available wavelength and
shared backup status can be separated from the general link TLV into
a TLV for dynamic link information.
<DynamicLinkInfo> ::= <LinkID> <AvailableWavelengths>
[<SharedBackupWavelengths>]
7. Security Considerations
This document defines protocol-independent encodings for WSON
information and does not introduce any security issues.
However, other documents that make use of these encodings within
protocol extensions need to consider the issues and risks associated
with, inspection, interception, modification, or spoofing of any of
this information. It is expected that any such documents will
describe the necessary security measures to provide adequate
protection.
8. IANA Considerations
TBD. Once our approach is finalized we may need identifiers for the
various TLVs and sub-TLVs.
9. Acknowledgments
This document was prepared using 2-Word-v2.0.template.dot.
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APPENDIX A: Encoding Examples
A.1. Link Set Field
Suppose that we wish to describe a set of ingress ports that are have
link local identifiers number 3 through 42. In the link set field we
set the Action = 1 to denote an inclusive range; the Dir = 1 to
denote ingress links; and, the Format = 0 to denote link local
identifiers. In particular we have:
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Action=1 |0 1|0 0 0 0 0 0| Length = 12 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link Local Identifier = #3 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link Local Identifier = #42 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
A.2. Wavelength Set Field
Example:
A 40 channel C-Band DWDM system with 100GHz spacing with lowest
frequency 192.0THz (1561.4nm) and highest frequency 195.9THz
(1530.3nm). These frequencies correspond to n = -11, and n = 28
respectively. Now suppose the following channels are available:
Frequency (THz) n Value bit map position
--------------------------------------------------
192.0 -11 0
192.5 -6 5
193.1 0 11
193.9 8 19
194.0 9 20
195.2 21 32
195.8 27 38
With the Grid value set to indicate an ITU-T G.694.1 DWDM grid, C.S.
set to indicate 100GHz this lambda bit map set would then be encoded
as follows:
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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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| 4 | Num Wavelengths = 40 | Length = 16 bytes |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|Grid | C.S. | Reserved | n for lowest frequency = -11 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|1 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|1 0 0 0 0 0 1 0| Not used in 40 Channel system (all zeros) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
To encode this same set as an inclusive list we would have:
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 | Num Wavelengths = 40 | Length = 20 bytes |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|Grid | C.S. | Reserved | n for lowest frequency = -11 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| n2 = -6 | n3 = 0 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| n4 = 8 | n5 = 9 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| n6 = 21 | n7 = 27 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
A.3. Connectivity Matrix Sub-TLV
Example:
Suppose we have a typical 2-degree 40 channel ROADM. In addition to
its two line side ports it has 80 add and 80 drop ports. The picture
below illustrates how a typical 2-degree ROADM system that works with
bi-directional fiber pairs is a highly asymmetrical system composed
of two unidirectional ROADM subsystems.
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(Tributary) Ports #3-#42
Ingress added to Egress dropped from
West Line Egress East Line Ingress
vvvvv ^^^^^
| |||.| | |||.|
+-----| |||.|--------| |||.|------+
| +----------------------+ |
| | | |
Egress | | Unidirectional ROADM | | Ingress
-----------------+ | | +--------------
<=====================| |===================<
-----------------+ +----------------------+ +--------------
| |
Port #1 | | Port #2
(West Line Side) | |(East Line Side)
-----------------+ +----------------------+ +--------------
>=====================| |===================>
-----------------+ | Unidirectional ROADM | +--------------
Ingress | | | | Egress
| | _ | |
| +----------------------+ |
+-----| |||.|--------| |||.|------+
| |||.| | |||.|
vvvvv ^^^^^
(Tributary) Ports #43-#82
Egress dropped from Ingress added to
West Line ingress East Line egress
Referring to the figure we see that the ingress direction of ports
#3-#42 (add ports) can only connect to the egress on port #1. While
the ingress side of port #2 (line side) can only connect to the
egress on ports #3-#42 (drop) and to the egress on port #1 (pass
through). Similarly, the ingress direction of ports #43-#82 can only
connect to the egress on port #2 (line). While the ingress direction
of port #1 can only connect to the egress on ports #43-#82 (drop) or
port #2 (pass through). We can now represent this potential
connectivity matrix as follows. This representation uses only 30 32-
bit words.
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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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Conn = 1 | MatrixID | Reserved |1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Note: adds to line
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Action=1 |0 1|0 0 0 0 0 0| Length = 12 |2
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link Local Identifier = #3 |3
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link Local Identifier = #42 |4
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Action=0 |1 0|0 0 0 0 0 0| Length = 8 |5
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link Local Identifier = #1 |6
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Note: line to drops
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Action=0 |0 1|0 0 0 0 0 0| Length = 8 |7
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link Local Identifier = #2 |8
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Action=1 |1 0|0 0 0 0 0 0| Length = 12 |9
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link Local Identifier = #3 |10
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link Local Identifier = #42 |11
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Note: line to line
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Action=0 |0 1|0 0 0 0 0 0| Length = 8 |12
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link Local Identifier = #2 |13
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Action=0 |1 0|0 0 0 0 0 0| Length = 8 |14
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link Local Identifier = #1 |15
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Note: adds to line
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Action=1 |0 1|0 0 0 0 0 0| Length = 12 |16
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link Local Identifier = #43 |17
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Link Local Identifier = #82 |18
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Action=0 |1 0|0 0 0 0 0 0| Length = 8 |19
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link Local Identifier = #2 |20
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Note: line to drops
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Action=0 |0 1|0 0 0 0 0 0|| Length = 8 |21
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link Local Identifier = #1 |22
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Action=1 |1 0|0 0 0 0 0 0| Length = 12 |23
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link Local Identifier = #43 |24
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link Local Identifier = #82 |25
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Note: line to line
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Action=0 |0 1|0 0 0 0 0 0| Length = 8 |26
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link Local Identifier = #1 |27
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Action=0 |1 0|0 0 0 0 0 0| Length = 8 |28
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link Local Identifier = #2 |30
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
A.4. Connectivity Matrix with Bi-directional Symmetry
If one has the ability to renumber the ports of the previous example
as shown in the next figure then we can take advantage of the bi-
directional symmetry and use bi-directional encoding of the
connectivity matrix. Note that we set dir=bidirectional in the link
set fields.
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(Tributary)
Ports #3-42 Ports #43-82
West Line Egress East Line Ingress
vvvvv ^^^^^
| |||.| | |||.|
+-----| |||.|--------| |||.|------+
| +----------------------+ |
| | | |
Egress | | Unidirectional ROADM | | Ingress
-----------------+ | | +--------------
<=====================| |===================<
-----------------+ +----------------------+ +--------------
| |
Port #1 | | Port #2
(West Line Side) | |(East Line Side)
-----------------+ +----------------------+ +--------------
>=====================| |===================>
-----------------+ | Unidirectional ROADM | +--------------
Ingress | | | | Egress
| | _ | |
| +----------------------+ |
+-----| |||.|--------| |||.|------+
| |||.| | |||.|
vvvvv ^^^^^
Ports #3-#42 Ports #43-82
Egress dropped from Ingress added to
West Line ingress East Line egress
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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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Conn = 1 | MatrixID | Reserved |1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Add/Drops #3-42 to Line side #1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Action=1 |0 0|0 0 0 0 0 0| Length = 12 |2
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link Local Identifier = #3 |3
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link Local Identifier = #42 |4
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Action=0 |0 0|0 0 0 0 0 0| Length = 8 |5
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link Local Identifier = #1 |6
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Note: line #2 to add/drops #43-82
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Action=0 |0 0|0 0 0 0 0 0| Length = 8 |7
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link Local Identifier = #2 |8
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Action=1 |0 0|0 0 0 0 0 0| Length = 12 |9
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link Local Identifier = #43 |10
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link Local Identifier = #82 |11
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Note: line to line
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Action=0 |0 0|0 0 0 0 0 0| Length = 8 |12
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link Local Identifier = #1 |13
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Action=0 |0 0|0 0 0 0 0 0| Length = 8 |14
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link Local Identifier = #2 |15
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
A.5. Wavelength Converter Accessibility Sub-TLV
Example:
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Figure 1 shows a wavelength converter pool architecture know as
"shared per fiber". In this case the ingress and egress pool matrices
are simply:
+-----+ +-----+
| 1 1 | | 1 0 |
WI =| |, WE =| |
| 1 1 | | 0 1 |
+-----+ +-----+
+-----------+ +------+
| |--------------------->| |
| |--------------------->| C |
/| | |--------------------->| o |
/D+--->| |--------------------->| m |
+ e+--->| | | b |========>
========>| M| | Optical | +-----------+ | i | Port E1
Port I1 + u+--->| Switch | | WC Pool | | n |
\x+--->| | | +-----+ | | e |
\| | +----+->|WC #1|--+---->| r |
| | | +-----+ | +------+
| | | | +------+
/| | | | +-----+ | | |
/D+--->| +----+->|WC #2|--+---->| C |
+ e+--->| | | +-----+ | | o |
========>| M| | | +-----------+ | m |========>
Port I2 + u+--->| | | b | Port E2
\x+--->| |--------------------->| i |
\| | |--------------------->| n |
| |--------------------->| e |
| |--------------------->| r |
+-----------+ +------+
Figure 1 An optical switch featuring a shared per fiber wavelength
converter pool architecture.
This wavelength converter pool can be encoded as follows:
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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
Note: I1,I2 can connect to either WC1 or WC2
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Action=0 |0 1|0 0 0 0 0 0| Length = 12 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link Local Identifier = #1 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link Local Identifier = #2 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Action=0 |1| Reserved | Length = 8 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| WC ID = #1 | WC ID = #2 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Note: WC1 can only connect to E1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Action=0 |0| Reserved | Length = 8 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| WC ID = #1 | zero padding |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Action=0 |1 0|0 0 0 0 0 0| Length = 8 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link Local Identifier = #1 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Note: WC2 can only connect to E2
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Action=0 |0| | Length = 8 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| WC ID = #2 | zero padding |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Action=0 |1 0|0 0 0 0 0 0| Length = 8 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link Local Identifier = #2 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
A.6. Wavelength Conversion Range Sub-TLV
Example:
We give an example based on figure 1 about how to represent the
wavelength conversion range of wavelength converters. Suppose the
wavelength range of input and output of WC1 and WC2 are {L1, L2, L3,
L4}:
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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
Note: WC Set
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Action=0 |1| Reserved | Length = 8 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| WC ID = #1 | WC ID = #2 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Note: wavelength input range
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| 2 | Num Wavelengths = 4 | Length = 8 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|Grid | C.S. | Reserved | n for lowest frequency = 1 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Note: wavelength output range
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| 2 | Num Wavelengths = 4 | Length = 8 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|Grid | C.S. | Reserved | n for lowest frequency = 1 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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10. References
10.1. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC2863] McCloghrie, K. and F. Kastenholz, "The Interfaces Group
MIB", RFC 2863, June 2000.
[RFC3471] Berger, L., "Generalized Multi-Protocol Label Switching
(GMPLS) Signaling Functional Description", RFC 3471,
January 2003.
[G.694.1] ITU-T Recommendation G.694.1, "Spectral grids for WDM
applications: DWDM frequency grid", June, 2002.
[RFC4202] Kompella, K., Ed., and Y. Rekhter, Ed., "Routing Extensions
in Support of Generalized Multi-Protocol Label Switching
(GMPLS)", RFC 4202, October 2005
[RFC4203] Kompella, K., Ed., and Y. Rekhter, Ed., "OSPF Extensions in
Support of Generalized Multi-Protocol Label Switching
(GMPLS)", RFC 4203, October 2005.
10.2. Informative References
[G.694.1] ITU-T Recommendation G.694.1, Spectral grids for WDM
applications: DWDM frequency grid, June 2002.
[G.694.2] ITU-T Recommendation G.694.2, Spectral grids for WDM
applications: CWDM wavelength grid, December 2003.
[Otani] T. Otani, H. Guo, K. Miyazaki, D. Caviglia, "Generalized
Labels for G.694 Lambda-Switching Capable Label Switching
Routers", work in progress: draft-ietf-ccamp-gmpls-g-694-
lambda-labels.
[RFC5307] Kompella, K., Ed., and Y. Rekhter, Ed., "IS-IS Extensions
in Support of Generalized Multi-Protocol Label Switching
(GMPLS)", RFC 5307, October 2008.
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[Switch] G. Bernstein, Y. Lee, A. Gavler, J. Martensson, " Modeling
WDM Wavelength Switching Systems for Use in GMPLS and Automated
Path Computation", Journal of Optical Communications and
Networking, vol. 1, June, 2009, pp. 187-195.
[WSON-Frame] Y. Lee, G. Bernstein, W. Imajuku, "Framework for GMPLS
and PCE Control of Wavelength Switched Optical Networks",
work in progress: draft-ietf-ccamp-wavelength-switched-
framework, Marh 2009.
[WSON-Info] G. Bernstein, Y. Lee, D. Li, W. Imajuku, "Routing and
Wavelength Assignment Information Model for Wavelength
Switched Optical Networks", work in progress: draft-ietf-
ccamp-rwa-info, March 2009.
[PCEP] Vasseur, JP., Ed. and JL. Le Roux, Ed., "Path Computation
Element (PCE) communication Protocol (PCEP) - Version 1",
RFC5440.
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11. Contributors
Diego Caviglia
Ericsson
Via A. Negrone 1/A 16153
Genoa Italy
Phone: +39 010 600 3736
Email: diego.caviglia@(marconi.com, ericsson.com)
Anders Gavler
Acreo AB
Electrum 236
SE - 164 40 Kista Sweden
Email: Anders.Gavler@acreo.se
Jonas Martensson
Acreo AB
Electrum 236
SE - 164 40 Kista, Sweden
Email: Jonas.Martensson@acreo.se
Itaru Nishioka
NEC Corp.
1753 Simonumabe, Nakahara-ku, Kawasaki, Kanagawa 211-8666
Japan
Phone: +81 44 396 3287
Email: i-nishioka@cb.jp.nec.com
Authors' Addresses
Greg M. Bernstein (ed.)
Grotto Networking
Fremont California, USA
Phone: (510) 573-2237
Email: gregb@grotto-networking.com
Bernstein and Lee Expires April 8, 2010 [Page 34]
Internet-Draft Wavelength Switched Optical Networks October 2009
Young Lee (ed.)
Huawei Technologies
1700 Alma Drive, Suite 100
Plano, TX 75075
USA
Phone: (972) 509-5599 (x2240)
Email: ylee@huawei.com
Dan Li
Huawei Technologies Co., Ltd.
F3-5-B R&D Center, Huawei Base,
Bantian, Longgang District
Shenzhen 518129 P.R.China
Phone: +86-755-28973237
Email: danli@huawei.com
Wataru Imajuku
NTT Network Innovation Labs
1-1 Hikari-no-oka, Yokosuka, Kanagawa
Japan
Phone: +81-(46) 859-4315
Email: imajuku.wataru@lab.ntt.co.jp
Jianrui Han
Huawei Technologies Co., Ltd.
F3-5-B R&D Center, Huawei Base,
Bantian, Longgang District
Shenzhen 518129 P.R.China
Phone: +86-755-28972916
Email: hanjianrui@huawei.com
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Bernstein and Lee Expires April 8, 2010 [Page 35]
Internet-Draft Wavelength Switched Optical Networks October 2009
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