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Draft about The Constraint Information Overview on WDM Switch Optical Network
Dear All,
With this document we would like to
share with you the overview of WDM switch network constraints information,
In addition we declared the the mechnism of link connectivity verification
on WDM switch network.
This is a new draft, welcome everyone
to discuss and contrbiute your special suggestion. We are appreciating
any of your contribution.
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Network Working Group Zhihong Kang
Zhenyu Wang
Feng Gao
Internet Draft ZTE
Intended status: July 7, 2008
Expires: Jan 2009
Link Connectivity and Common Constraint Information Extension to
GMPLS for WDM Switched Optical Networks
draft-kang-ccamp-WDM-switch-info-00.txt
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Copyright (C) The IETF Trust (0000).
Abstract
This document provides the mechanism of link connectivity
verification and the constraint information extension to route for
static light path computation and selection in WDM network.
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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
.
Table of Contents
1. Introduction................................................2
2. Terminology.................................................4
3. Link Verification...........................................4
4. Constraint Information......................................5
4.1. WDM Link...............................................5
4.2. WDM Link Constraint....................................5
4.3. OCH Constraint.........................................6
4.4. Tunable Laser..........................................6
5. Information Model..........................................6
5.1. Link Information......................................6
5.2. Lambda Group ID.......................................7
5.3. Wavelength Label......................................9
6. Application to OSPF GMPLS extensions........................9
6.1. Link Sub-TLVs.........................................9
6.1.1. Maximum of optical channels sub-TLV...............9
6.1.2. Link Constraint sub-TLV..........................9
6.1.3. Wavelength Availability,Switch Capability Sub-TLV15
6.1.4. Reachable OTU Sub-TLV...........................16
7. Security Considerations....................................17
8. IANA Considerations........................................18
9. Acknowledgments............................................18
10. Acknowledgments..........................................18
11. References................................................18
11.1. Normative References.................................18
11.2. Informative References...............................18
Author's Addresses............................................19
Intellectual Property Statement...............................19
Disclaimer of Validity........................................20
1. Introduction
This document provides foundational information model Appling ASON to
WDM network, we called the series of function aggregation for ASON
applied to WDM "WASON" (WDM Automatic Switch Optical Network). This
likewise includes automatic discovery, route, and signaling. But the
current standard RFC cannot completely support WASON implementation,
it is well-know that RWA is the key problem in WASON. There are
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certain constraints in the light path computation and selection
process, this is the root of RWA problem. This document provides the
constraint character abstracting to information model for combined
RWA.
At the same time, the mechanism of automatic discovery for WASON have
not definitely been defined, In SDH, J0 trace correlation or test
message sent in band over DCC provide the mechanism of link
connectivity verification. In WDM network, we recommend that OSC
channel (which is defined in G.709) could be the mechanism of link
connectivity verification between adjacent nodes.
In DWDM network, there are certain specific constraints which are
different from other circuit switched network such as Time Division
Multiplexing (TDM). The most obvious constraint is that the
wavelength must be consistent in the light path, which is called
"wavelength continuity" constraint. Even though there are certain
"wavelength switch" capabilities by O-E-O way, but which cannot
support full switch because of the electronic matrix capability
limitation. At the same time between two TE links in one node may not
be connected to carry traffic, which depend on the inner light path
between these two links is whether connected through the fiber.,
especially for multi directional ROADM equipments, and the client
traffic also need to know the inner optical path to the TE link. All
of these constraints need to face and figure out. This document start
form the combined RWA way to describe information model extend to
route application, this is considered that the restoration time in
optical network have relatively strict restriction, hopefully static
path computation and selection could be satisfied to end-to-to
restoration time. The link and wavelength channel constraints need to
be described as the explicable information flooded in the network.
The link constraints information mainly consists of two parts, one is
the connectivity with other links, the other is the arrival
information to the tributary side (Add and Drop port in ROADM, called
OTU).
This document prefer to the combined RWA way and provide enough
resource information for static path computation and selection, and
this is also consistent with the distributed signaling way to setup
end-to-end connection via multiple light paths attempt. So this
document is the supplementary for the automatic discovery mechanism
in WASON, and mainly focus on all of the constraint information
description and efficient encodings of information used for route
flood.
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2. Terminology
ASON: Automatic Switch Optical Network
DWDM: Dense Wavelength Division Multiplexing
WASON: WDM Automatic Switch Optical Network
RWA: Route and Wavelength Assignment
DCC: Data Communication Channel
OSC: Optical Supervisory Channel
ROADM: Reconfigurable Optical Add/Drop Multiplexer
O-E-O: Optical-Electronic-Optical
SDH: Synchronous digital hierarchy
SONET: Synchronous Optical Network
OTU: Optical Transponder Unit
3. Link Verification
Link verification is used to verify the physical connectivity of the
data links and to exchange the Interface Ids of the data links. The
data links between adjacent nodes in WDM network also need the
transport medium to verify the connectivity and exchange the
interface Ids of data plane. Then synchronize the data links to form
TE link used for path computation and signaling. RFC4207 have
significantly defined the mechanisms of link connectivity applicable
to SDH/SONET. But for WDM system, there is no significant definition
for the link connectivity verification mechanism. OSC channel is as
the natural and specific transport channel embedded in the DWM link.
So this document defines the new link verification mechanism used for
WDM link. The following is the two mechanism definition.
One is that Test message is sent over OSC channel and TestStatus
messages sent back over the control channel. The Test Message is
defined in [RFC4204].
The other is that the OSC channel is used to send and receive Trace
Message. The Test Message is not transmitted over OSC channel (i.e.,
over the data link), but is sent over the control channel and
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correlated for consistency to the received Trace Message from OSC
channel.
The content of Trace Message is unique in the network. It could be
the combination of local interface Id and Node Id.
The process of link connectivity verification between adjacent WDM
nodes is consistent with SDH/SONET, this can be referred to [RFC4204]
and [RFC4207].
4. Constraint Information
WDM Link Bandwidth
Link Constraint Character
Wavelength Continuity Constraint
O-E-O Wavelength Switch Capability
Tunable Laser
4.1. WDM Link
The bandwidth of WDM link should be concerned as the number of
wavelength, could not be counted as signal rates because the
wavelength cannot be restricted to carry certain rates of signal, or
certain frame type of signal.
Consider to interlayer, Wavelength channel layer is used to be server
layer path to carry client traffic, such as GE multiplexing.
4.2. WDM Link Constraint
There are certain constraints to set up end-to-end connection even
though there are available bandwidths in one light path. The
tributary side (We called OTU) of Ingress and Egress node need to
know the arrival capability to the TE link. It is not that the
tributary side can arrive up to all of TE links, and down from all of
TE links. The TE links on the two sides of Transmit node may not
completely have the capability to connect to transmit traffic. These
constraints exist in DWM node as the optical signal flow must be
connected from the inner of node. This is very different from circuit
switch network which make use of integrated circuit design to get
electronic signals to mutual connection. If TE links on the two sides
of Transmit node don't get optical inner connection, the traffic
carried on one wavelength can not pass through the node from one side
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to the other side. The constraint on the WDM link challenge the
traditional route computation algorithm based on the available
bandwidth of TE link.
4.3. OCH Constraint
It is well-known that the wavelength basically need to keep
consistent in the light path, this is called "Wavelength continuity"
constraint. Even though O-E-O can add certain "wavelength switch"
capability to the system, but the electronic matrix in the DWM
equipment do not completely have the full switch capability.
So wavelength availability and switch capability information is
important to analyze the availability of light path from end to end.
4.4. Tunable Laser
The tributary transmitter laser is tunable, this add certain
flexibility to path computation and selection process. Ingress and
egress node can add and drop traffic in the extent of tunable
wavelength from the reachable TE links. The transmitter tuning
information is one factor to take into account during the light path
computation and selection, and connection set up.
5. Information Model
5.1. Link Information
WDM link information derived from RFC3630 and RFC4203, and add new
sub-elements constraints to link information model:
(a) Maximum of optical channels (wavelength), which is the bandwidth
of WDM link.
(b) Link direction, this is used to account for the bit map position
in the link constraint information, this is one global unique Id
assigned in the node.
(c) Link constraint information, which represent the connectivity
with other links, and was indicated by the bit map, the bit position
represents the connectivity with one direction link.
(d) Wavelength availability, which represent the state of the
corresponding optical wavelength channel.
(e) Wavelength switch capability, one set of wavelength aggregation
could be switched via electronic matrix. The optical signals carried
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in the wavelength can flow to or flow out from the same electronic
matrix unit after optical-electronic-optical change, all of these
wavelengths could switch. One global unique ID named "Lambda Group
Id" represents one electronic matrix unit. The Lambda Group Id is the
identification of the aggregation of wavelengths in which the optical
signals flow to or flow out from the same matrix unit.
Lambda Group Id represent the aggregation of wavelength set, the
wavelengths with same Lambda Group Id can be mutually switched via O-
E-O. The special value 0 represent the optical signal carried in the
wavelength only can pass via the same wavelength.
Wavelength switch capability can be identified by Lambda Group Id,
which was carried with Wavelength availability information.
(f) Reachable tributary (OTU) information, which describe the
aggregation of Reachable OTU, and for every Reachable OTU, which also
indicate out the available wavelength set. The information also can
be got via the communication between ingress and egress nodes before
initiate call connection setup.
Note: only (a) are necessary for WDM link, others are used for static
path computation and assemble signaling.
5.2. Lambda Group ID
+------+ +------+
| | =+=+=+=+=+=+=+=+¦Ë1 ¦Ë5+=+=+=+=+=+=+= | |
+ DWDM + =+=+=+=+=+=+¦Ë2| +------+ |¦Ë6+=+=+=+=+= + DWDM +
| 1 | =+=+=+=+¦Ë3| +=+= | | =+=+=+ |¦Ë7+=+=+= | 2 |
+------+ | +=+=+=+= +MATRIX| =+=+=+=+=+ | +------+
+=+=+=+=+=+= | 1 | =+=+=+=+=+=+=+
+------+
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+------+ +------+
| | =+=+=+=+=+=+=+=+¦Ë1 ¦Ë3+=+=+=+=+=+=+= | |
+ DWDM + =+=+=+=+=+=+¦Ë3| +------+ |¦Ë5+=+=+=+=+= + DWDM +
| 3 | =+=+=+=+¦Ë4| +=+= | | =+=+=+ |¦Ë7+=+=+= | 4 |
+------+ | +=+=+=+= +MATRIX| =+=+=+=+=+ | +------+
+=+=+=+=+=+= | 2 | =+=+=+=+=+=+=+
+------+
Figure 1 O-E-O Switch Model
The Lambda Group ID is identification of the aggregation of
Wavelength set in which the wavelengths could be mutually switched,
and is also the identification of O-E-O switch capability. Here don't
consider the asymmetric switch matrix.
The figure showed above, the link from DWDM1 have three lambdas (¦Ë1,
¦Ë2, ¦Ë3) flow to the matrix unit1, the link from DWDM1 have three
lambdas (¦Ë5, ¦Ë6, ¦Ë7) flow to the matrix unit1, they could be switched.
Likewise the link from DWDM3 have three lambdas (¦Ë1, ¦Ë3, ¦Ë4) flow to
the matrix unit2, the link from DWDM4 have three lambdas (¦Ë3, ¦Ë5, ¦Ë7)
flow to the matrix unit2, they could be switched.
For the lambdas (¦Ë1, ¦Ë2, ¦Ë3) of the link of DWDM1 and the lambdas (¦Ë5,
¦Ë6, ¦Ë7) of the link of DWDM2, the Lambda Group ID could assign to be
1;
For the lambdas (¦Ë1, ¦Ë3, ¦Ë4) of the link of DWDM3 and the lambdas (¦Ë3,
¦Ë5, ¦Ë7) of the link of DWDM4, the Lambda Group ID could assign to be
2;
So the lambda group id is the identification of wavelength switch
capability, and also is the identification of the aggregation of
Wavelength set in which the wavelengths could be mutually switched,
and their lambda group ids are same.
The special value 0 lambda group id represent the optical signal
carried in the wavelength only can pass via the same wavelength. Do
not have the capability of O-E-O.
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5.3. Wavelength Label
This document makes frequent use of the lambda label format defined
in [Otani] shown 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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|Grid | C.S |S| Reserved | n |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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 for the value of n, set to 1 for (-) and 0 for (+).
n = Used to specify the frequency as 193.1THz +/- n*(channel spacing)
where the + or - is chosen based on the sign (S) bit.
6. Application to OSPF GMPLS extensions
6.1. Link Sub-TLVs
As discussed in section 5.1, some sub-TLVs need to characterize for
WDM links.
6.1.1. Maximum of optical channels sub-TLV
Maximum of optical channels sub-TLV specifies the maximum optical
wavelength channels that can be used on this WDM link. The value can
be 40, 80, 160, 192 etc.
6.1.2. Link Constraint sub-TLV
There are two ways to show the link connectivity constraint with
other links. One is the links including list, the second is the bit
map to indicate the connectivity with other links. The second need to
assign the unique direction Id for each link. The information carried
in the link constraint is:
0 1 2 3
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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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|Dir| Method | Direction | Num Links | Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Bit Map Word #1 Or Link Identifier 1 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
: : :
: : :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Bit Map Word #N Or Link Identifier N |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Dir: 2 bits
0 - bidirectional, Indicate the connectivity from the link to other
links bidirectional.
1 - Ingress, Indicate the connectivity to other links from the
ingress port of the link to the egress ports of other links.
2 - Egress, Indicate the connectivity from the ingress ports of other
links to the egress port of the link.
Method: 6 bits
0 - Bit Map
1 - Link Set
Others - Reserved to be used later.
Direction: 8 bits
Direction is one unique Id assigned in the node, start from 1. This
is different from link index, and is used to account for bit position
in the bit map carried in other links constraint sub-TLV.
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Num Links: 8 bits
Num links tell us the number of link identifiers followed or the
number bits of link connectivity represented by the bit map.
Bit map have the same rule in the link constraint information in
order that RWA algorithm can analyze the connectivity of links. Each
bit in the bit map represents one specific link with value 1/0
indicating the constraint connectivity with the link. The bit
position represent the specific link witch is its own, the value on
this bit is 1.
A B C D E F G H I K J L M N O P Q R S
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| | | | | | | | | | | | | | | | | | | | :::
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The rule for bit map showed below, the link direction is used here to
indicate the bit position.
Position Link Direction Meaning
---------------------------------------------------------------------
A 1 indicate the connectivity between the link and specific link of direction Id 1
B 2 indicate the connectivity between the link and specific link of direction Id 2
C 3 indicate the connectivity between the link and specific link of direction Id 3
D 4 indicate the connectivity between the link and specific link of direction Id 4
E 5 indicate the connectivity between the link and specific link of direction Id 5
F 6 indicate the connectivity between the link and specific link of direction Id 6
G 7 indicate the connectivity between the link and specific link of direction Id 7
H 8 indicate the connectivity between the link and specific link of direction Id 8
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I 9 indicate the connectivity between the link and specific link of direction Id 9
: : :
: : :
: : :
: : :
---------------------------------------------------------------------
For example:
V^ 2
||
||
||
||
1 +-+-+-+-+-+-+-+ 3
<---------------| | ----------------<
>---------------+ ROADM + ---------------->
| |
+-+-+-+-+-+-+-+
||
||
||
||
^V 4
Figure 2 Example For WDM Links
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There are four WDM links in the ROADM node, and the link direction
Ids are respectively 1, 2, 3, 4. Here ignore the detail of
connectivity between the links. Assume that Link 1 bidirectional
connect to Link 2, and Link 3 bidirectional connect to Link 4.
The constraint information in each link represent as follows:
Link of direction 1:
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 | 1 | 1 | Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link identifier of direction 2 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Or:
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 | 0 | 1 | 4 | Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|1|1|0|0| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Link of direction 2:
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| 0 | 1 | 2 | 1 | Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link identifier of direction 1 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Or:
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 | 0 | 2 | 4 | Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|1|1|0|0| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Link of direction 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 | 3 | 1 | Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link identifier of direction 4 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Or:
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| 0 | 0 | 3 | 4 | Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0|0|1|1| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Link of direction 4:
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 | 4 | 1 | Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link identifier of direction 3 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Or:
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 | 0 | 4 | 4 | Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0|0|1|1| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
6.1.3. Wavelength Availability,Switch Capability Sub-TLV
The information of optical wavelength channel includes the resource
state, and description of switch capability via O-E-O.
Wavelength Availability, Switch Capability Set Sub-TLV 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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|Grid | C.S |S| Reserved | Num Wavelengths |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| N1 For Start Center Frequency |Lambda Group Id| State |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| N2 |Lambda Group Id| State |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| .. |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|Nn (Highest frequency channels)|Lambda Group Id| State |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Num Wavelengths specifies the number of wavelengths followed in the
sub-TLV. This is generally equal to Maximum of optical channels.
Lambda group Id indicates the wavelength switch capability.
State indicates the resource state of wavelength channel. 0 is free,
1 is occupied.
6.1.4. Reachable OTU Sub-TLV
The reachable OTU sub-TLV 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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Num Reachable OTUs |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| OTU Identifier1 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Num Suggested Lambda For OTU Identifier1 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Suggested Lambda #1 | Suggested Lambda #2 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| ... | Suggested Lambda #N |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| ... |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| OTU IdentifierN |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Num Suggested Lambda For OTU IdentifierN |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Suggested Lambda #1 | Suggested Lambda #2 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| ... | Suggested Lambda #N |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
This sub-TLV gives out the reachable OTU information and the
suggested available lambdas could be dropped traffic signal from the
link to OTU, and can add client traffic signal from OTU to the link.
7. Security Considerations
This document has no requirement for a change to the security models
within GMPLS and associated protocols.
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8. IANA Considerations
No new values are specified in this document.
9. Acknowledgments
This document was prepared using 2-Word-v2.0.template.dot.
10. References
10.1. Normative References
[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.
[RFC3630] Katz, D., Kompella, K., and D. Yeung, "Traffic Engineering
(TE) Extensions to OSPF Version 2", RFC 3630, September
2003.
[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
[Otani] T. Otani, H. Guo, K. Miyazaki, D. Caviglia, "Generalized
Labels of Lambda-Switching Capable Label Switching Routers
(LSR)", work in progress: draft-otani-ccamp-gmpls-lambda-
labels-01.txt, November 2007.
Kang Expires Jan, 2009 [Page 18]
Internet-Draft Constraints Overview For WDM Switched Optical Network Jul 2008
Author's Addresses
Zhihong Kang
ZTE Technologies Co., Ltd.
12F, ZTE Plaza, No.19 East HuaYuan Road, HaiDian District
Phone: +86-10-82963984
Email: kang.zhihong@zte.com.cn
Zhenyu Wang
ZTE Technologies Co., Ltd.
12F, ZTE Plaza, No.19 East HuaYuan Road, HaiDian District
Phone: +86-10-82963987
Email: wang.zhenyu1@zte.com.cn
Feng Gao
ZTE Technologies Co., Ltd.
12F, ZTE Plaza, No.19 East HuaYuan Road, HaiDian District
Phone: +86-10-82963984
Email: gao.feng1@zte.com.cn
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Kang Expires Jan, 2009 [Page 19]
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Kang Expires Jan, 2009 [Page 20]