draft-ietf-ccamp-rwa-info-08.txt   draft-ietf-ccamp-rwa-info-09.txt 
Network Working Group Y. Lee Network Working Group Y. Lee
Internet Draft Huawei Internet Draft Huawei
Intended status: Informational G. Bernstein Intended status: Informational G. Bernstein
Expires: January 2011 Grotto Networking Expires: March 2011 Grotto Networking
D. Li D. Li
Huawei Huawei
W. Imajuku W. Imajuku
NTT NTT
July 12, 2010 September 3, 2010
Routing and Wavelength Assignment Information Model for Wavelength Routing and Wavelength Assignment Information Model for Wavelength
Switched Optical Networks Switched Optical Networks
draft-ietf-ccamp-rwa-info-08.txt draft-ietf-ccamp-rwa-info-09.txt
Status of this Memo Status of this Memo
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information that may be of use to other technologies utilizing a information that may be of use to other technologies utilizing a
GMPLS control plane are discussed. GMPLS control plane are discussed.
Table of Contents Table of Contents
1. Introduction...................................................3 1. Introduction...................................................3
1.1. Revision History..........................................4 1.1. Revision History..........................................4
1.1.1. Changes from 01......................................4 1.1.1. Changes from 01......................................4
1.1.2. Changes from 02......................................4 1.1.2. Changes from 02......................................4
1.1.3. Changes from 03......................................4 1.1.3. Changes from 03......................................4
1.1.4. Changes from 04......................................4 1.1.4. Changes from 04......................................5
1.1.5. Changes from 05......................................5 1.1.5. Changes from 05......................................5
1.1.6. Changes from 06......................................5 1.1.6. Changes from 06......................................5
1.1.7. Changes from 07......................................5 1.1.7. Changes from 07......................................5
1.1.8. Changes from 08......................................5
2. Terminology....................................................5 2. Terminology....................................................5
3. Routing and Wavelength Assignment Information Model............6 3. Routing and Wavelength Assignment Information Model............6
3.1. Dynamic and Relatively Static Information.................6 3.1. Dynamic and Relatively Static Information.................6
4. Node Information (General).....................................7 4. Node Information (General).....................................7
4.1. Connectivity Matrix.......................................7 4.1. Connectivity Matrix.......................................7
4.2. Shared Risk Node Group....................................8 4.2. Shared Risk Node Group....................................8
5. Node Information (WSON specific)...............................8 5. Node Information (WSON specific)...............................8
5.1. Resource Accessibility/Availability.......................9 5.1. Resource Accessibility/Availability.......................9
5.2. Resource Signal Constraints and Processing Capabilities..13 5.2. Resource Signal Constraints and Processing Capabilities..13
5.3. Compatibility and Capability Details.....................14 5.3. Compatibility and Capability Details.....................14
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5.3.4. Bit Rate Range List.................................14 5.3.4. Bit Rate Range List.................................14
5.3.5. Acceptable Client Signal List.......................15 5.3.5. Acceptable Client Signal List.......................15
5.3.6. Processing Capability List..........................15 5.3.6. Processing Capability List..........................15
6. Link Information (General)....................................15 6. Link Information (General)....................................15
6.1. Administrative Group.....................................16 6.1. Administrative Group.....................................16
6.2. Interface Switching Capability Descriptor................16 6.2. Interface Switching Capability Descriptor................16
6.3. Link Protection Type (for this link).....................16 6.3. Link Protection Type (for this link).....................16
6.4. Shared Risk Link Group Information.......................16 6.4. Shared Risk Link Group Information.......................16
6.5. Traffic Engineering Metric...............................16 6.5. Traffic Engineering Metric...............................16
6.6. Port Label (Wavelength) Restrictions.....................16 6.6. Port Label (Wavelength) Restrictions.....................16
7. Dynamic Components of the Information Model...................18 6.6.1. Port-Wavelength Exclusivity Example.................18
7.1. Dynamic Link Information (General).......................18 7. Dynamic Components of the Information Model...................19
7.2. Dynamic Node Information (WSON Specific).................19 7.1. Dynamic Link Information (General).......................20
8. Security Considerations.......................................19 7.2. Dynamic Node Information (WSON Specific).................20
9. IANA Considerations...........................................19 8. Security Considerations.......................................20
10. Acknowledgments..............................................19 9. IANA Considerations...........................................21
11. References...................................................20 10. Acknowledgments..............................................21
11.1. Normative References....................................20 11. References...................................................22
11.2. Informative References..................................21 11.1. Normative References....................................22
12. Contributors.................................................22 11.2. Informative References..................................23
Author's Addresses...............................................22 12. Contributors.................................................24
Intellectual Property Statement..................................23 Author's Addresses...............................................24
Disclaimer of Validity...........................................24 Intellectual Property Statement..................................25
Disclaimer of Validity...........................................26
1. Introduction 1. Introduction
The purpose of the following information model for WSONs is to The purpose of the following information model for WSONs is to
facilitate constrained lightpath computation and as such is not a facilitate constrained lightpath computation and as such is not a
general purpose network management information model. This constraint general purpose network management information model. This constraint
is frequently referred to as the "wavelength continuity" constraint, is frequently referred to as the "wavelength continuity" constraint,
and the corresponding constrained lightpath computation is known as and the corresponding constrained lightpath computation is known as
the routing and wavelength assignment (RWA) problem. Hence the the routing and wavelength assignment (RWA) problem. Hence the
information model must provide sufficient topology and wavelength information model must provide sufficient topology and wavelength
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Simplified information model for WSON specifics, by combining similar Simplified information model for WSON specifics, by combining similar
fields and introducing simpler aggregate information elements. fields and introducing simpler aggregate information elements.
1.1.7. Changes from 07 1.1.7. Changes from 07
Added shared fiber connectivity to resource pool modeling. This Added shared fiber connectivity to resource pool modeling. This
includes information for determining wavelength collision on an includes information for determining wavelength collision on an
internal fiber providing access to resource blocks. internal fiber providing access to resource blocks.
1.1.8. Changes from 08
Added PORT_WAVELENGTH_EXCLUSIVITY in the RestrictionType parameter.
Added section 6.6.1 that has an example of the port wavelength
exclusivity constraint.
2. Terminology 2. Terminology
CWDM: Coarse Wavelength Division Multiplexing. CWDM: Coarse Wavelength Division Multiplexing.
DWDM: Dense Wavelength Division Multiplexing. DWDM: Dense Wavelength Division Multiplexing.
FOADM: Fixed Optical Add/Drop Multiplexer. FOADM: Fixed Optical Add/Drop Multiplexer.
ROADM: Reconfigurable Optical Add/Drop Multiplexer. A reduced port ROADM: Reconfigurable Optical Add/Drop Multiplexer. A reduced port
count wavelength selective switching element featuring ingress and count wavelength selective switching element featuring ingress and
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was generally discussed in [WSON-Frame] and consisted of a matrix to was generally discussed in [WSON-Frame] and consisted of a matrix to
indicate possible connectivity along with wavelength constraints for indicate possible connectivity along with wavelength constraints for
links/ports. Since regenerators or wavelength converters may be links/ports. Since regenerators or wavelength converters may be
considered a scarce resource we will also want to our model to considered a scarce resource we will also want to our model to
include as a minimum the usage state (availability) of individual include as a minimum the usage state (availability) of individual
regenerators or converters in the pool. Models that incorporate more regenerators or converters in the pool. Models that incorporate more
state to further reveal blocking conditions on ingress or egress to state to further reveal blocking conditions on ingress or egress to
particular converters are for further study and not included here. particular converters are for further study and not included here.
The three stage model as shown schematically in Figure 1 and Figure The three stage model as shown schematically in Figure 1 and Figure
2. In this model we assume N ingress ports (fibers), P resource 2.The difference between the two figures is that in Figure 1 we
blocks containing one or more identical resources (e.g. wavelength assume that each signal that can get to a resource block may do so,
while in Figure 2 the access to the resource blocks is via a shared
fiber which imposes its own wavelength collision constraint. In the
representation of Figure 1 we can have more than one ingress to each
resource block since each ingress represents a single wavelength
signal, while in Figure 2 we show a single multiplexed WDM ingress,
e.g., a fiber, to each block.
In this model we assume N ingress ports (fibers), P resource blocks
containing one or more identical resources (e.g. wavelength
converters), and M egress ports (fibers). Since not all ingress ports converters), and M egress ports (fibers). Since not all ingress ports
can necessarily reach each resource block, the model starts with a can necessarily reach each resource block, the model starts with a
resource pool ingress matrix RI(i,p) = {0,1} whether ingress port i resource pool ingress matrix RI(i,p) = {0,1} whether ingress port i
can reach potentially reach resource block p. can reach potentially reach resource block p.
Since not all wavelengths can necessarily reach all the resources or Since not all wavelengths can necessarily reach all the resources or
the resources may have limited input wavelength range we have a set the resources may have limited input wavelength range we have a set
of relatively static ingress port constraints for each resource. In of relatively static ingress port constraints for each resource. In
addition, if the access to a resource block is via a shared fiber addition, if the access to a resource block is via a shared fiber
this would impose a dynamic wavelength availability constraints on (Figure 2) this would impose a dynamic wavelength availability
that shared fiber. We can model each resource block ingress port constraint on that shared fiber. We can model each resource block
constraint via a static wavelength set mechanism and in the case of ingress port constraint via a static wavelength set mechanism and in
shared access to a block via another dynamic wavelength set the case of shared access to a block via another dynamic wavelength
mechanism. set mechanism.
Next we have a state vector RA(j) = {0,...,k} which tells us the Next we have a state vector RA(j) = {0,...,k} which tells us the
number of resources in resource block j in use. This is the only number of resources in resource block j in use. This is the only
state kept in the resource pool model. This state is not necessary state kept in the resource pool model. This state is not necessary
for modeling "fixed" transponder system or full OEO switches with WDM for modeling "fixed" transponder system or full OEO switches with WDM
interfaces, i.e., systems where there is no sharing. interfaces, i.e., systems where there is no sharing.
After that, we have a set of static resource egress wavelength After that, we have a set of static resource egress wavelength
constraints and possibly dynamic shared egress fiber constraints. The constraints and possibly dynamic shared egress fiber constraints. The
static constraints indicate what wavelengths a particular resource static constraints indicate what wavelengths a particular resource
block can generate or are restricted to generating e.g., a fixed block can generate or are restricted to generating e.g., a fixed
regenerator would be limited to a single lambda. The dynamic regenerator would be limited to a single lambda. The dynamic
constraints would be used in the case where a single shared fiber is constraints would be used in the case where a single shared fiber is
used to egress the resource block. used to egress the resource block (Figure 2).
Finally, we have a resource pool egress matrix RE(p,k) = {0,1} Finally, we have a resource pool egress matrix RE(p,k) = {0,1}
depending on whether the output from resource block p can reach depending on whether the output from resource block p can reach
egress port k. Examples of this method being used to model wavelength egress port k. Examples of this method being used to model wavelength
converter pools for several switch architectures from the literature converter pools for several switch architectures from the literature
are given in reference [WC-Pool]. are given in reference [WC-Pool].
I1 +-------------+ +-------------+ E1 I1 +-------------+ +-------------+ E1
----->| | +--------+ | |-----> ----->| | +--------+ | |----->
I2 | +------+ Rb #1 +-------+ | E2 I2 | +------+ Rb #1 +-------+ | E2
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The RestrictionType parameter is used to specify general port The RestrictionType parameter is used to specify general port
restrictions and matrix specific restrictions. It can take the restrictions and matrix specific restrictions. It can take the
following values and meanings: following values and meanings:
SIMPLE_WAVELENGTH: Simple wavelength set restriction; The SIMPLE_WAVELENGTH: Simple wavelength set restriction; The
wavelength set parameter is required. wavelength set parameter is required.
CHANNEL_COUNT: The number of channels is restricted to be less than CHANNEL_COUNT: The number of channels is restricted to be less than
or equal to the Max number of channels parameter (which is required). or equal to the Max number of channels parameter (which is required).
PORT_WAVELENGTH_EXCLUSIVITY: A wavelength can be used at most once
among a given set of ports. The set of ports is specified as a
parameter to this constraint.
WAVEBAND1: Waveband device with a tunable center frequency and WAVEBAND1: Waveband device with a tunable center frequency and
passband. This constraint is characterized by the MaxWaveBandWidth passband. This constraint is characterized by the MaxWaveBandWidth
parameters which indicates the maximum width of the waveband in terms parameters which indicates the maximum width of the waveband in terms
of channels. Note that an additional wavelength set can be used to of channels. Note that an additional wavelength set can be used to
indicate the overall tuning range. Specific center frequency tuning indicate the overall tuning range. Specific center frequency tuning
information can be obtained from dynamic channel in use information. information can be obtained from dynamic channel in use information.
It is assumed that both center frequency and bandwidth (Q) tuning can It is assumed that both center frequency and bandwidth (Q) tuning can
be done without causing faults in existing signals. be done without causing faults in existing signals.
Restriction specific parameters are used with one or more of the Restriction specific parameters are used with one or more of the
previously listed restriction types. The currently defined parameters previously listed restriction types. The currently defined parameters
are: are:
LabelSet is a conceptual set of labels (wavelengths). LabelSet is a conceptual set of labels (wavelengths).
MaxNumChannels is the maximum number of channels that can be MaxNumChannels is the maximum number of channels that can be
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are: are:
LabelSet is a conceptual set of labels (wavelengths). LabelSet is a conceptual set of labels (wavelengths).
MaxNumChannels is the maximum number of channels that can be MaxNumChannels is the maximum number of channels that can be
simultaneously used (relative to either a port or a matrix). simultaneously used (relative to either a port or a matrix).
MaxWaveBandWidth is the maximum width of a tunable waveband MaxWaveBandWidth is the maximum width of a tunable waveband
switching device. switching device.
PortSet is a conceptual set of ports.
For example, if the port is a "colored" drop port of a ROADM then we For example, if the port is a "colored" drop port of a ROADM then we
have two restrictions: (a) CHANNEL_COUNT, with MaxNumChannels = 1, have two restrictions: (a) CHANNEL_COUNT, with MaxNumChannels = 1,
and (b) SIMPLE_WAVELENGTH, with the wavelength set consisting of a and (b) SIMPLE_WAVELENGTH, with the wavelength set consisting of a
single member corresponding to the frequency of the permitted single member corresponding to the frequency of the permitted
wavelength. See [Switch] for a complete waveband example. wavelength. See [Switch] for a complete waveband example.
This information model for port wavelength (label) restrictions is This information model for port wavelength (label) restrictions is
fairly general in that it can be applied to ports that have label fairly general in that it can be applied to ports that have label
restrictions only or to ports that are part of an asymmetric switch restrictions only or to ports that are part of an asymmetric switch
and have label restrictions. In addition, the types of label and have label restrictions. In addition, the types of label
restrictions that can be supported are extensible. restrictions that can be supported are extensible.
6.6.1. Port-Wavelength Exclusivity Example
Although there can be many different ROADM or switch architectures
that can lead to the constraint where a lambda (label) maybe used at
most once on a set of ports Figure 3 shows a ROADM architecture based
on components known as a Wavelength Selective Switch (WSS)[OFC08].
This ROADM is composed of splitters, combiners, and WSSes. This ROADM
has 11 egress ports, which are numbered in the diagram. Egress ports
1-8 are known as drop ports and are intended to support a single
wavelength. Drop ports 1-4 egress from WSS #2, which is fed from WSS
#1 via a single fiber. Due to this internal structure a constraint is
placed on the egress ports 1-4 that a lambda can be only used once
over the group of ports (assuming uni-cast and not multi-cast
operation). Similarly we see that egress ports 5-8 have a similar
constraint due to the internal structure.
| A
v 10 |
+-------+ +-------+
| Split | |WSS 6 |
+-------+ +-------+
+----+ | | | | | | | |
| W | | | | | | | | +-------+ +----+
| S |--------------+ | | | +-----+ | +----+ | | S |
9 | S |----------------|---|----|-------|------|----|---| p |
<--| |----------------|---|----|-------|----+ | +---| l |<--
| 5 |--------------+ | | | +-----+ | | +--| i |
+----+ | | | | | +------|-|-----|--| t |
+--------|-+ +----|-|---|------|----+ | +----+
+----+ | | | | | | | | |
| S |-----|--------|----------+ | | | | | | +----+
| p |-----|--------|------------|---|------|----|--|--| W |
-->| l |-----|-----+ | +----------+ | | | +--|--| S |11
| i |---+ | | | | +------------|------|-------|--| S |-->
| t | | | | | | | | | | +---|--| |
+----+ | | +---|--|-|-|------------|------|-|-|---+ | 7 |
| | | +--|-|-|--------+ | | | | | +----+
| | | | | | | | | | | |
+------+ +------+ +------+ +------+
| WSS 1| | Split| | WSS 3| | Split|
+--+---+ +--+---+ +--+---+ +--+---+
| A | A
v | v |
+-------+ +--+----+ +-------+ +--+----+
| WSS 2 | | Comb. | | WSS 4 | | Comb. |
+-------+ +-------+ +-------+ +-------+
1|2|3|4| A A A A 5|6|7|8| A A A A
v v v v | | | | v v v v | | | |
Figure 3 A ROADM composed from splitter, combiners, and WSSs.
7. Dynamic Components of the Information Model 7. Dynamic Components of the Information Model
In the previously presented information model there are a limited In the previously presented information model there are a limited
number of information elements that are dynamic, i.e., subject to number of information elements that are dynamic, i.e., subject to
change with subsequent establishment and teardown of connections. change with subsequent establishment and teardown of connections.
Depending on the protocol used to convey this overall information Depending on the protocol used to convey this overall information
model it may be possible to send this dynamic information separate model it may be possible to send this dynamic information separate
from the relatively larger amount of static information needed to from the relatively larger amount of static information needed to
characterize WSON's and their network elements. characterize WSON's and their network elements.
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[RFC5307] Kompella, K., Ed., and Y. Rekhter, Ed., "IS-IS Extensions [RFC5307] Kompella, K., Ed., and Y. Rekhter, Ed., "IS-IS Extensions
in Support of Generalized Multi-Protocol Label Switching in Support of Generalized Multi-Protocol Label Switching
(GMPLS)", RFC 5307, October 2008. (GMPLS)", RFC 5307, October 2008.
[WSON-Frame] Y. Lee, G. Bernstein, W. Imajuku, "Framework for GMPLS [WSON-Frame] Y. Lee, G. Bernstein, W. Imajuku, "Framework for GMPLS
and PCE Control of Wavelength Switched Optical Networks", and PCE Control of Wavelength Switched Optical Networks",
work in progress: draft-ietf-ccamp-rwa-wson-framework. work in progress: draft-ietf-ccamp-rwa-wson-framework.
11.2. Informative References 11.2. Informative References
[OFC08] P. Roorda and B. Collings, "Evolution to Colorless and
Directionless ROADM Architectures," Optical Fiber
communication/National Fiber Optic Engineers Conference, 2008.
OFC/NFOEC 2008. Conference on, 2008, pp. 1-3.
[Shared] G. Bernstein, Y. Lee, "Shared Backup Mesh Protection in PCE- [Shared] G. Bernstein, Y. Lee, "Shared Backup Mesh Protection in PCE-
based WSON Networks", iPOP 2008, http://www.grotto- based WSON Networks", iPOP 2008, http://www.grotto-
networking.com/wson/iPOP2008_WSON-shared-mesh-poster.pdf . networking.com/wson/iPOP2008_WSON-shared-mesh-poster.pdf .
[Switch] G. Bernstein, Y. Lee, A. Gavler, J. Martensson, " Modeling [Switch] G. Bernstein, Y. Lee, A. Gavler, J. Martensson, " Modeling
WDM Wavelength Switching Systems for Use in GMPLS and Automated WDM Wavelength Switching Systems for Use in GMPLS and Automated
Path Computation", Journal of Optical Communications and Path Computation", Journal of Optical Communications and
Networking, vol. 1, June, 2009, pp. 187-195. Networking, vol. 1, June, 2009, pp. 187-195.
[G.Sup39] ITU-T Series G Supplement 39, Optical system design and [G.Sup39] ITU-T Series G Supplement 39, Optical system design and
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