Network Working Group G. Bernstein
Internet Draft Grotto Networking
Intended status: Standards Track Y. Lee
Expires: May 2009 D. Li
Huawei
W. Imajuku
NTT
November 3, 2008
Routing and Wavelength Assignment Information Encoding for
Wavelength Switched Optical Networks
draft-bernstein-ccamp-wson-encode-01.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
GMSPL 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
2. Terminology....................................................3
3. Encoding of WSON Information: Sub-TLVs.........................4
3.1. Link Set Sub-TLV..........................................4
3.2. Connectivity Matrix Sub-TLV...............................6
3.3. Wavelength Information Encoding...........................9
3.4. Wavelength Set Sub-TLV...................................10
3.4.1. Inclusive/Exclusive Wavelength Lists................10
3.4.2. Inclusive/Exclusive Wavelength Ranges...............11
3.4.3. Bitmap Wavelength Set...............................11
3.5. Port Wavelength Restriction sub-TLV......................13
4. Composite TLVs................................................14
4.1. WSON Node TLV............................................14
4.2. WSON Link TLV............................................14
4.3. WSON Dynamic Link TLV....................................15
4.4. WSON Dynamic Node TLV....................................16
5. Security Considerations.......................................16
6. IANA Considerations...........................................16
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7. Acknowledgments...............................................16
8. References....................................................17
8.1. Normative References.....................................17
8.2. Informative References...................................17
9. Contributors..................................................19
Authors' Addresses...............................................19
Intellectual Property Statement..................................20
Disclaimer of Validity...........................................21
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
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.
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
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"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. Encoding of WSON Information: Sub-TLVs
A 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.
3.1. Link Set Sub-TLV
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]. All links will be denoted by
their local link identifier as defined an used in [RFC4202],
[RFC4203], and [RFC5307].
The information carried in a Link Set 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 |Dir| Format | Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link Identifier 1 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
: : :
: : :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link Identifier N |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Action: 8 bits
0 - Inclusive List
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Indicates that the TLV contains one or more link elements that are
included in the Link Set.
2 - Inclusive Range
Indicates that the TLV contains a range of links. The object/TLV
contains two link 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.
Dir: Directionality of the Link Set (2 bits)
0 -- bidirectional
1 -- incoming
2 -- outgoing
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
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
Others TBD.
Note that all link identifiers in the same list must be of the same
type.
Reserved: 16 bits
This field is reserved. It MUST be set to zero on transmission and
MUST be ignored on receipt.
Link Identifier:
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
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local identifier format can result in more compact WSON encodings
when the assignments are done in a reasonable fashion.
3.2. 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
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 | Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link Set A #1 |
: : :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link Set B #1 :
: : :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Additional Link set pairs as needed |
: to specify connectivity :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Where Connectivity = 0 if the device is fixed
1 if the device is switched(e.g., ROADM/OXC)
TBD: Should we just have two sub-TLVs one for fixed one for switched?
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 | Reserved |1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Note: adds to line
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Action=2 |0 1|0 0 0 0 0 0|Reserved(Note:inclusive range) |2
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link Local Identifier = #3 |3
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link Local Identifier = #42 |4
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Action=0 |1 0|0 0 0 0 0 0|Reserved (Note:inclusive list) |5
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link Local Identifier = #1 |6
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Note: line to drops
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Action=0 |0 1|0 0 0 0 0 0|Reserved (Note:inclusive list) |7
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link Local Identifier = #2 |8
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Action=2 |1 0|0 0 0 0 0 0|Reserved(Note: inclusive range)|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|Reserved (Note:inclusive list) |12
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link Local Identifier = #2 |13
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Action=0 |1 0|0 0 0 0 0 0|Reserved(Note: inclusive range)|14
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link Local Identifier = #1 |15
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Note: adds to line
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Action=2 |0 1|0 0 0 0 0 0|Reserved(Note:inclusive range) |16
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link Local Identifier = #42 |17
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link Local Identifier = #82 |18
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Action=0 |1 0|0 0 0 0 0 0|Reserved (Note:inclusive list) |19
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link Local Identifier = #2 |20
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Note: line to drops
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Action=0 |0 1|0 0 0 0 0 0|Reserved (Note:inclusive list) |21
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link Local Identifier = #1 |22
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Action=2 |1 0|0 0 0 0 0 0|Reserved(Note: inclusive range)|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|Reserved (Note:inclusive list) |26
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link Local Identifier = #1 |27
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Action=0 |1 0|0 0 0 0 0 0|Reserved(Note: inclusive range)|28
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link Local Identifier = #2 |30
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3.3. Wavelength Information Encoding
This document makes frequent use of the lambda label format defined
in [Otani] shown below strictly for reference purposes:
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. |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 a ITU-T
G.694.1 grid.
S = sign of the offset from the center frequency of 193.1THz for the
ITU-T G.694.1 grid.
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n = Used to specify the frequency as 193.1THz +/- n*(channel spacing)
where the + or - is chosen based on the sign (S) bit.
3.4. Wavelength Set Sub-TLV
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 | Reserved | Num Wavelengths |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|Grid | C.S. |S| Reserved | n for lowest frequency |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Additional fields as necessary per action |
|
Action:
0 - Inclusive List
1 - Exclusive List
2 - Inclusive Range
3 - Exclusive Range
4 - Bitmap Set
3.4.1. Inclusive/Exclusive Wavelength Lists
In the case of the inclusive/exclusive lists 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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|Action=0 or 1 | Reserved | Num Wavelengths |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|Grid | C.S. |S| Reserved | n for lowest frequency |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| n2 | n3 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
: :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| nm | |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Where Num Wavelengths tells us the number of wavelength in this
inclusive or exclusive list this does not include the initial
wavelength in the list hence if the number of wavelengths is odd then
zero padding of the last half word is required.
3.4.2. Inclusive/Exclusive Wavelength Ranges
In the case of inclusive/exclusive ranges 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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|Action=2 or 3 | Reserved | Num Wavelengths |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|Grid | C.S. |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 (regardless of
the value of the sign bit).
3.4.3. Bitmap Wavelength Set
In the case of Action = 4, the bitmap 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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Action = 4 | Reserved | Num Wavelengths |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|Grid | C.S. |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 clearly Num Wavelengths bits, but the bit
map is made up 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 - 1) and beyond) SHOULD be set to
zero and MUST be ignored.
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, and with S (sign) set to indicate negative
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Action = 4 | Reserved | Num Wavelengths = 40 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|Grid | C.S. |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) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3.5. Port Wavelength Restriction sub-TLV
The port wavelength restriction of [WSON-Info] can be encoded as a
sub-TLV 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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|RestrictionKind|T| Reserved | MaxNumChannels |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
--Wavelength Set--
| Action | Reserved | Num Wavelengths |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|Grid | C.S. |S| Reserved | n for lowest frequency |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Additional fields as necessary per action |
| |
RestrictionKind can take the following values and meanings:
0: Simple wavelength selective restriction. Max number of channels
indicates the number of wavelengths permitted on the port and the
accompanying wavelength set indicates the permitted values.
1: Waveband device with a tunable center frequency and passband. In
this case the maximum number of channels 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.
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It is assumed that both center frequency and bandwidth (Q) tuning can
be done without causing faults in existing signals.
Values for T include:
0 == Use with a fixed connectivity matrix
1 == Use with a switched connectivity matrix
TBD: Should we just have two flavors of sub-TLV then?
4. Composite TLVs
The Four composite TLVs in the following sections are based on the
four high level information bundles of [WSON-Info].
4.1. WSON Node TLV
The WSON Node TLV consists of the following ordered list of sub-TLVs:
<Node_Info> ::= <Node_ID> [<SwitchedConnectivityMatrix>]
[<FixedConnectivityMatrix>], [<SRNG>] [<WavelengthConverterPool>]
o Node ID (This will be derived from standard IETF node identifiers)
o Switch Connectivity Matrix - (optional) This is a connectivity
matrix sub-TLV with the connectivity type set to "switched" (conn
= 1)
o Fixed Connectivity Matrix - (optional) This is a connectivity
matrix sub-TLV with the connectivity type set to "fixed" (conn =
0).
o Shared Risk Node Group - (optional) Format TBD.
o Wavelength Converter Pool - (optional) Format TBD.
4.2. WSON Link TLV
Note that a number of sub-TLVs for links have already been defined
and it is for further study if we can or should reuse any of those
sub-TLVs in our encoding. Note that for a system already employing
GMPLS based routing the existing encodings and transport mechanisms
should be used and the information does not need to appear twice.
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<LinkInfo> ::= <LinkID> [<AdministrativeGroup>] [<InterfaceCapDesc>]
[<Protection>] [<SRLG>]... [<TrafficEngineeringMetric>]
[<MaximumBandwidthPerChannel>] <[SwitchedPortWavelengthRestriction>]
[<FixedPortWavelengthRestriction>]
o Link Identifier - Need to double check on this with RFC4203
(required).
o Administrative Group - (optional) Standard sub-TLV type 9,
RFC3630.
o Interface Switching Capability Descriptor - Standard sub-TLV type
15, RFC4203.
o Protection - (optional) Standard sub-TLV type 15, RFC4203.
o Shared Risk Link Group - (optional) Standard sub-TLV 16, RFC4203.
o Traffic Engineering Metric - (optional) Standard sub-TLV type 5,
RFC3630.
o Maximum Bandwidth per Channel - TBD.
o Switched Port Wavelength Restriction - (optional) The port
wavelength restriction sub-TLV with T = 1.
o Fixed Port Wavelength Restriction - (optional) The port wavelength
restriction sub-TLV with T = 0.
4.3. WSON Dynamic Link TLV
<DynamicLinkInfo> ::= <LinkID> <AvailableWavelengths>
[<SharedBackupWavelengths>]
Where
<LinkID> ::= <LocalLinkID> <LocalNodeID> <RemoteLinkID>
<RemoteNodeID>
o Available Wavelengths - A wavelength set sub-TLV used to indicate
which wavelengths are available on this link.
o Shared Backup Wavelengths - (optional) A wavelength set sub-TLV
used to indicate which wavelengths on this link are currently used
for shared backup protection (and hence can possibly be reused).
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4.4. WSON Dynamic Node TLV
<NodeInfoDynamic> ::= <NodeID> [<WCPoolState>]
o Node ID - Format TBD.
o Wavelength Converter Pool Status - (optional) Format TBD.
Note that currently the only dynamic information modeled with a node
is associated with the status of the wavelength converter pool.
5. 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.
6. IANA Considerations
TBD. Once our approach is finalized we may need identifiers for the
various TLVs and sub-TLVs.
7. Acknowledgments
This document was prepared using 2-Word-v2.0.template.dot.
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8. References
8.1. 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.
[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-02.txt, July 2008.
8.2. 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.
[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 Automated Path
Computation", http://www.grotto-
networking.com/wson/ModelingWSONswitchesV2a.pdf , June, 2008
[WSON-Frame] G. Bernstein, Y. Lee, W. Imajuku, "Framework for GMPLS
and PCE Control of Wavelength Switched Optical Networks",
work in progress: draft-ietf-ccamp-wavelength-switched-
framework-01.txt, July 2008.
[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-01.txt, October 2008.
[PCEP] Vasseur, JP., Ed. and JL. Le Roux, Ed., "Path Computation
Element (PCE) communication Protocol (PCEP) - Version 1",
draft-ietf-pce-pcep, work in progress.
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9. 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
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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
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