Internet DRAFT - draft-kang-ccamp-wdm-switch-info
draft-kang-ccamp-wdm-switch-info
Network Working Group Zhihong.Kang
Zhenyu.Wang
Feng.Gao
Internet Draft ZTE
Intended status: September 9, 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 Notice
Copyright (C) The IETF Trust (2008).
Abstract
This document provides the mechanism of link connectivity
verification and the constraint information extension to GMPLS IGP or
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Conveyed to a path computation element (PCE) for static light path
computation and selection in WDM network.
Table of Contents
1. Introduction..................................................2
2. Terminology...................................................3
3. Link Verification.............................................4
4. Constraint Information........................................4
4.1. WDM Link Bandwidth.......................................5
4.2. WDM Link Layer Constraint................................5
4.3. WDM Optical Channel Constraint...........................5
4.4. WDM Optical Tributary Constraint.........................6
4.5. Optical-Electronic Conversion Port Switch Capability.....6
4.6. Tunable Laser............................................6
5. Information Model.............................................7
5.1. Link Information.........................................7
5.2. Lambda Group ID..........................................8
5.3. O-E-O Switch ID..........................................9
5.4. Wavelength Label........................................10
6. Application to OSPF GMPLS extensions.........................10
6.1. Link Sub-TLVs...........................................10
6.1.1. Maximum of optical channels sub-TLV................11
6.1.2. Link Constraint sub-TLV............................11
6.1.3. Wavelength Availability, Switch Capability Sub-TLV.17
6.1.4. Reachable Add or Drop Port Sub-TLV.................18
7. Security Considerations......................................19
8. IANA Considerations..........................................19
9. Acknowledgments..............................................20
10. References..................................................20
10.1. Normative References...................................20
10.2. Informative References.................................20
Author's Addresses..............................................21
Intellectual Property Statement.................................21
Disclaimer of Validity..........................................22
1. Introduction
This document provides foundational information model Appling GMPLS
to WDM network, we called the series of function aggregation for
GMPLS applied to WDM network "WSON" (Wavelength Switch Optical
Network). This likewise includes automatic discovery, route, and
signaling. But the current standard RFC cannot completely support
WSON implementation. It is well-known that RWA is the key problem in
WSON. There are certain constraints in the light path computation and
selection process, this is the root of RWA problem. This document
provides the constraint information model used for optical light path
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computation and selection. Actually the information model needs to
solve two problems: one is the inner optical light path routing
representation information and the corresponding available resources
(Wavelengths) description. The other is the switch capability
information based on the optical wavelength channel layer or Optical-
Electronic switch port, this is also used for multi-layer path
computation and implementation.
In WDM network, there are certain specific constraints which are
different from other circuit switched network such as Time Division
Multiplexing (TDM). The constraints mainly include:
a) WDM link layer constraint, if the traffic need to pass through
from linear ingress port to linear egress port, there must be having
the inner connectivity from linear ingress port to linear egress
port.
b) WDM optical channel layer constraint, the traffic carried in the
wavelength need to keep consistent along the light path without O-E-O
(Optical-Electrical-Optical), it is known that this is "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 switch capability limitation.
c) WDM optical tributary constraint, not every linear Ingress port
could have the inner light path connectivity and available
wavelengths along the inner light path to tributary drop ports. And
not every tributary add port could have the inner light path
connectivity and available wavelengths along the inner light path to
linear egress ports.
In addition optical impairments (such as signal power, OSNR) are not
to be considered.
This document prefer to the combined RWA way to describe information
model and efficient encodings extension to GMPLS IGP application. In
addition these useful information and encodings could be conveyed to
a path computation element (PCE).
2. Terminology
WDM: Wavelength Division Multiplexing
WSON: WDM Switch Optical Network
RWA: Route and Wavelength Assignment
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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
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 the
natural and specific transport channel embedded in the WDM 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
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
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Link Constraint Character
Wavelength Continuity Constraint
O-E-O Wavelength Switch Capability
Optical-Electronic Conversion Port Switch Capability
Tunable Transmitter Laser
4.1. WDM Link Bandwidth
The bandwidth of WDM link should be regarded as the number of
wavelengths, which 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 SDH/SONET, ODUk.
4.2. WDM Link Layer Constraint
Inner link connectivity of one link with other links in one node
identifies the link constraint information. The link constraint
information indicates out the possibility of conveying traffic
in the link layer.
4.3. WDM Optical Channel Constraint
It is known that the wavelength basically need to keep consistent
along the light path, this is called Wavelength continuity
constraint. Even though O-E-O conversion can add certain wavelength
switch capability to the system, but the electronic matrix in the WDM
equipment do not completely have the full switch capability. In
addition wavelength switch capability information only can be applied
to the condition that is the specific wavelength must have the single
correlation with one fixed Optical-Electronic switch port whose
transmitter laser is not tunable. Under this condition, wavelength
switch capability can be characterized by an input wavelength set and
an output wavelength set. The signals carried in an input wavelength
set flow in the same electronic matrix unit, do switch, and then flow
out with equivalent contents bearing the output wavelength set. We
named "Lambda Group Id" to represent the identification of
aggregation of an input wavelength set and an output wavelength set
which could be mutually switched, Lambda Group Id could be the
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identification of electronic matrix unit in the system. The "Lambda
Group Id" is carried with wavelength status to represent the
wavelength constraint information.
So wavelength availability and switch capability information are
important to analyze the availability of resources along the light
path.
4.4. WDM Optical Tributary Constraint
Not every linear Ingress port could have the inner light path
connectivity and available wavelengths along the inner light path to
tributary drop ports. It is also that not every tributary add port
could have the inner light path connectivity and available
wavelengths along the inner light path to linear egress ports.
The link information should indicate out the reachable tributary
ports and corresponding available wavelengths for the reachable
tributary ports.
4.5. Optical-Electronic Conversion Port Switch Capability
Port switch capability indicate out the traffic with one specific
wavelength (which is in the tunable extent) flow in Optical-
Electronic Conversion ingress port, do optical-electronic conversion,
do electronic matrix switch, then do electronic-optical conversion,
flow out from Optical-Electronic Conversion egress port with one
specific wavelength (which is in the tunable extent). The port switch
capability could be characterized by one unique ID in one node which
represents the aggregation of ingress ports and egress ports. The
unique ID is named O-E-O switch ID.
The link information also needs to indicate out the reachable
Optical-Electronic Conversion Ports and the corresponding available
wavelengths. The port switch capability is accompanied with t his
information.
This is the base model to implement wavelength switch by O-E-O way.
4.6. Tunable Laser
The transmitter laser is tunable, this add certain flexibility for
the inner path computation and selection process.
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5. Information Model
5.1. Link Information
WDM link information derives from RFC3630 and RFC4203, and adds new
sub-element constraints to link information model:
(a) Maximum of optical channels (wavelength), which is the bandwidth
of WDM link.
(b) Link index, this is used to account for the bit map position in
the link constraint information, this is one global unique Id start
from 1 and assigned in the node.
(c) Link constraint information, which represents the connectivity
with other links, and was indicated by the bit map, the bit position
represents the connectivity with one link, or indicated by the link
set.
(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
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, and do not have the
wavelength switch capability.
Wavelength switch capability can be identified by Lambda Group Id,
which was carried with Wavelength availability information.
(f) Reachable tributary add or drop ports, link information should
indicate out the Reachable tributary add or drop ports. For each
reachable port, it also needs to indicate out the available
wavelengths. For Optical-Electronic conversion port, it also needs to
indicate out the switch capability.
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Note: only (a) are necessary for WDM link, others are used for
combined RWA.
5.2. Lambda Group ID
+------+ +------+
| | =+=+=+=+=+Lambda 1 Lambda 5 +=+=+=+=+= | |
+ DWDM + =+=+=+Lambda 2 | +------+ |Lambda 6 +=+=+= + DWDM +
| 1 | =+Lambda 3 | +=+= | | =+=+ |Lambda 7 += | 2 |
+------+ | +=+=+=+= +MATRIX| =+=+=+=+ | +------+
+=+=+=+=+=+= | 1 | =+=+=+=+=+=+
+------+
+------+ +------+
| | =+=+=+=+=+Lambda 1 Lambda 3 +=+=+=+=+= | |
+ DWDM + =+=+=+Lambda 3 | +------+ |Lambda 5 +=+=+= + DWDM +
| 3 | =+Lambda 4 | +=+= | | =+=+ |Lambda 7 += | 4 |
+------+ | +=+=+=+= +MATRIX| =+=+=+=+ | +------+
+=+=+=+=+=+= | 2 | =+=+=+=+=+=+
+------+
Figure 1 O-E-O Wavelength 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
(Lambda 1, Lambda 2, Lambda 3) flow to the matrix unit1, the link
from DWDM2 have three lambdas (Lambda 5, Lambda 6, Lambda 7) flow to
the matrix unit1, they could be switched. Likewise the link from
DWDM3 have three lambdas (Lambda 1, Lambda 3, Lambda 4) flow to the
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matrix unit2, the link from DWDM4 have three lambdas (Lambda 3,
Lambda 5, Lambda 7) flow to the matrix unit2, they could be switched.
For the lambdas (Lambda 1, Lambda 2, Lambda 3) of the link of DWDM1
and the lambdas (Lambda 5, Lambda 6, Lambda 7) of the link of DWDM2,
the Lambda Group ID could assign to be 1;
For the lambdas (Lambda 1, Lambda 3, Lambda 4) of the link of DWDM3
and the lambdas (Lambda 3, Lambda 5, Lambda 7) 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.
5.3. O-E-O Switch ID
+--------+ +--------+
| WDM | Port_1+------+ +------+ Port_2 | WDM |
| Link 1 +========+ O/E +===|| ||===+ E/O +=========+ Link 2 |
| | | Unit | || || | Unit | | |
+--------+ +------+ || || +------+ +--------+
|| ||
+--++---++--+
| Electronic|
| Matrix |
| Unit |
+--++---++--+
|| ||
+--------+ +------+ || || +------+ +--------+
| WDM | Port_3| O/E | || || | E/O | Port_4 | WDM |
| Link 3 +========+ Unit +===|| ||===+ Unit +======== + Link 4 |
| | +------+ +------+ | |
+--------+ +--------+
Figure 2 O-E-O Port Switch Model
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The figure showed above, there are four optical-electronic conversion
units. These four optical-electronic conversion units could be
mutually switched via one electronic switch unit. The port switch
capability can be characterized by one unique ID named O-E-O Switch
ID which is related to the electronic switch unit identification.
The link information indicates out the reachable optical-electronic
conversion ports and the available resources. In addition, for each
reachable port, it also indicates out the port switch capability.
5.4. 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 an 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.
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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 index for each link. The information carried in the
link constraint 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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|Dir| Method | Index | 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.
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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.
Index: 8 bits
Index is one unique Id assigned in the node, start from 1. This is
used to account for bit position in the bit map carried in other
links constraint sub-TLV.
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 which 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 index is used here to
indicate the bit position.
Position Link Index Meaning
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---------------------------------------------------------------------
A 1 indicate connectivity between the link and link of index 1
B 2 indicate connectivity between the link and link of index 2
C 3 indicate connectivity between the link and link of index 3
D 4 indicate connectivity between the link and link of index 4
E 5 indicate connectivity between the link and link of index 5
F 6 indicate connectivity between the link and link of index 6
G 7 indicate connectivity between the link and link of index 7
H 8 indicate connectivity between the link and link of index 8
I 9 indicate connectivity between the link and link of index 9
: : :
: : :
: : :
: : :
---------------------------------------------------------------------
For example:
V^ 2
||
||
||
||
1 +-+-+-+-+-+-+-+ 3
<---------------| | ----------------<
>---------------+ ROADM + ---------------->
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| |
+-+-+-+-+-+-+-+
||
||
||
||
^V 4
Figure 2 Example For WDM Links
There are four WDM links in the ROADM node, and the link index 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 Index 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 Index 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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| 0 | 0 | 1 | 4 | Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|1|1|0|0| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Link of Index 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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| 0 | 1 | 2 | 1 | Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link identifier of Index 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 Index 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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| 0 | 1 | 3 | 1 | Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link identifier of Index 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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| 0 | 0 | 3 | 4 | Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0|0|1|1| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Link of Index 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 Index 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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| 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 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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|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.
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Lambda group Id indicates the wavelength switch capability. The
special value 0 represents no optical-electronic conversion
capability.
State indicates the resource state of wavelength channel. 0 is free,
1 is occupied.
6.1.4. Reachable Add or Drop Port Sub-TLV
The reachable Add or Drop Port 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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Dir | Reserved | Num of Reachable Ports |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Port Identifier1 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Port1 Switch Capability |Num Suggested Available Lambdas|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Suggested Lambda #1 | Suggested Lambda #2 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| ... | Suggested Lambda #N |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| ... |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Port IdentifierN |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| PortN Switch Capability |Num Suggested Available Lambdas|
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Suggested Lambda #1 | Suggested Lambda #2 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| ... | Suggested Lambda #N |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Dir: 8 bits
0 - bidirectional, Indicate the connectivity from the link to
Tributary add and drop ports, or optical-electronic conversion add
and drop ports.
1 - Ingress, Indicate the connectivity from the ingress port of the
link to the Tributary drop ports or optical-electronic conversion
drop ports.
2 - Egress, Indicate the connectivity from the Tributary add ports or
optical-electronic conversion add ports to the egress port of the
link.
Num of Reachable Ports: 16 bits
Num of Reachable Ports indicates out the number of reachable Ports
information followed, including the available wavelengths and port
switch capability information.
This sub-TLV gives out the Edge Link information and the suggested
available lambdas could be dropped traffic signal from the link to
edge link, and can add client traffic signal from edge link to the
link.
7. Security Considerations
This document has no requirement for a change to the security models
within GMPLS and associated protocols.
8. IANA Considerations
No new values are specified in this document.
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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.
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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 March, 2009 [Page 22]
