Network Working Group Y. Lee
D. Dhody
Huawei
Internet Draft
Intended status: Standard Track
Expires: June 2015
March 5, 2015
A Yang Data Model for WSON Optical Networks
draft-lee-ccamp-wson-yang-00
Abstract
This document provides a YANG data model for the routing and
wavelength assignment (RWA) process in wavelength switched optical
networks (WSONs).
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Copyright Notice
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Copyright (c) 2015 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
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Table of Contents
1. Introduction...................................................2
2. Routing and Wavelength Assignment Informational Model..........3
2.1. Connectivity Matrix Model.................................3
2.2. Resource Pool Model.......................................4
2.3. Port Label Restriction Model..............................8
2.4. Wavelength Availability on Links..........................9
3. YANG Model....................................................10
4. WSON-RWA YANG Model...........................................11
5. Security Considerations.......................................17
6. IANA Considerations...........................................17
7. Acknowledgments...............................................17
8. References....................................................18
8.1. Normative References.....................................18
8.2. Informative References...................................18
9. Contributors..................................................18
Authors' Addresses...............................................18
1. Introduction
This document provides a YANG data model for the routing and
wavelength assignment (RWA) process in wavelength switched optical
networks (WSONs). The YANG model described in this document is a
WSON technology-specific Yang model based on the information model
developed in [RFC7446] and the two encoding drafts [WSON-Encode] and
[Gen-Encode] that developed protocol independent encodings based on
[RFC7446].
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What is not in scope of this document is both impairment-aware WSON
and flex-grid.
2. Routing and Wavelength Assignment Informational Model
The relevant information model in this document comprises
- Connectivity Matrix Model (Section 2.1)
- Resource Pool Model (Section 2.2)
- Port Wavelength Restriction (Section 2.3)
- Wavelength Availability on Links (Section 2.4)
[Editor's Note: This version covers the corresponding YANG data
model for the first two sections (Sections 2.1 and 2.2) and leaves
the YANG model for Sections 2.3 and 2.4 in the later version.]
Sections 2.1 - 2.4 rehashes key information models from [RFC7446]
to facilitate the development of the YANG model (Section 3).
2.1. Connectivity Matrix Model
The connectivity matrix (ConnectivityMatrix) represents either the
potential connectivity matrix for asymmetric switches (e.g. ROADMs
and such) or fixed connectivity for an asymmetric device such as a
multiplexer.
Note that multiple connectivity matrices are allowed and the Node_ID
would be an appropriate identifier for the node to point the
Connectivity matrix within the WSON RWA context.
<Node_Information> ::= <Node_ID> [<ConnectivityMatrix>...]
<ConnectivityMatrix> ::= <MatrixID>
<ConnType>
<Matrix>
Where
<MatrixID> is a unique identifier for the matrix.
<ConnType> can be either 0 or 1 depending upon whether the
connectivity is either fixed or switched.
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<Matrix> represents the fixed or switched connectivity in that
Matrix(i, j) = 0 or 1 depending on whether input port i can connect
to output port j for one or more wavelengths.
2.2. Resource Pool Model
A WSON node may include regenerators or wavelength converters
arranged in a shared pool. As discussed in [RFC6163] this can
include Optical-Electronic-Optical (OEO) based Wavelength Division
Multiplexing (WDM) switches as well. There are a number of different
approaches used in the design of WDM switches containing regenerator
or converter pools. However, from the point of view of path
computation the following need to be known:
1. The nodes that support regeneration or wavelength conversion.
2. The accessibility and availability of a wavelength converter to
convert from a given input wavelength on a particular input port
to a desired output wavelength on a particular output port.
3. Limitations on the types of signals that can be converted and the
conversions that can be performed.
The following Figures show resource pool architecture of WSON.
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I1 +-------------+ +-------------+ O1
----->| | +--------+ | |----->
I2 | +------+ Rb #1 +-------+ | O2
----->| | +--------+ | |----->
| | | |
| Resource | +--------+ | Resource |
| Pool +------+ +-------+ Pool |
| | + Rb #2 + | |
| Input +------+ +-------| Output |
| Connection | +--------+ | Connection |
| Matrix | . | Matrix |
| | . | |
| | . | |
IN | | +--------+ | | OM
----->| +------+ Rb #P +-------+ |----->
| | +--------+ | |
+-------------+ ^ ^ +-------------+
| |
| |
| |
| |
Input wavelength Output wavelength
constraints for constraints for
each resource each resource
Note: Rb is a Resource Block.
Figure 1 Schematic diagram of resource pool model.
Since resources tend to be packaged together in blocks of similar
devices, e.g., on line cards or other types of modules, the
fundamental unit of identifiable resource in this document is the
"resource block". A resource block may contain one or more
resources. A resource is the smallest identifiable unit of
processing allocation. One can group together resources into blocks
if they have similar characteristics relevant to the optical system
being modeled, e.g., processing properties, accessibility, etc.
This leads to the following formal high level model:
<Node_Information> ::= <Node_ID>
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[<ConnectivityMatrix>...]
[<ResourcePool>]
Where
<ResourcePool> ::= <ResourceBlockInfo>...
[<ResourceAccessibility>...]
[<ResourceWaveConstraints>...]
[<RBPoolState>]
<ResourceAccessibility> ::= <PoolInputMatrix>
<PoolOutputMatrix>
<ResourceWaveConstraints> ::= <InputWaveConstraints>
<OutputOutputWaveConstraints>
<RBSharedAccessWaveAvailability> ::= [<InAvailableWavelengths>]
[<OutAvailableWavelengths>]
<RBPoolState> ::= <ResourceBlockID>
<NumResourcesInUse>
[<RBSharedAccessWaveAvailability>]
[<RBPoolState>]
<ResourceBlockInfo> ::= <ResourceBlockSet>
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[<InputConstraints>]
[<ProcessingCapabilities>]
[<OutputConstraints>]
Where <ResourceBlockSet> is a list of resource block identifiers
with the same characteristics. If this set is missing the
constraints are applied to the entire network element.
<InputConstraints> ::= <SharedInput>
[<OpticalInterfaceClassList>]
[<ClientSignalList>]
<ProcessingCapabilities> ::= [<NumResources>]
[<RegenerationCapabilities>]
[<FaultPerfMon>]
[<VendorSpecific>]
<OutputConstraints> := <SharedOutput>
[<OpticalInterfaceClassList>]
[<ClientSignalList>]
<OpticalInterfaceClassList> ::= <OpticalInterfaceClass> ...
<ClientSignalList>::=[<G-PID>]...
1. Number of Resources within the block
2. Regeneration capability
3. Fault and performance monitoring
4. Vendor Specific capability
Note that the code points for Fault and performance monitoring and
vendor specific capability are subject to further study.
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2.3. Port Label Restriction Model
<LinkInfo> ::= <LinkID>
[<AdministrativeGroup>]
[<InterfaceCapDesc>]
[<Protection>]
[<SRLG>...]
[<TrafficEngineeringMetric>]
[<PortLabelRestriction>...]
Note that these additional link characteristics only applies to line
side ports of WDM system or add/drop ports pertaining to Resource
Pool (e.g., Regenerator or Wavelength Converter Pool). The
advertisement of input/output tributary ports is not intended here.
<PortLabelRestriction> ::= <MatrixID>
<Restriction parameters list>
<Restriction parameters list> ::=
<LabelSet> ...
Where
MatrixID is the ID of the corresponding connectivity matrix.
LabelSet is a conceptual set of labels (wavelengths).
MaxNumChannels is the maximum number of channels that can be
simultaneously used (relative to either a port or a matrix).
LinkSet is a conceptual set of ports.
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2.4. Wavelength Availability on Links
In the previously presented information model there are a limited
number of information elements that are dynamic, i.e., subject to
change with subsequent establishment and teardown of connections.
Depending on the protocol used to convey this overall information
model it may be possible to send this dynamic information separate
from the relatively larger amount of static information needed to
characterize WSON's and their network elements.
<DynamicLinkInfo> ::= <LinkID>
<AvailableLabels>
[<SharedBackupLabels>]
AvailableLabels is a set of labels (wavelengths) currently available
on the link. Given this information and the port wavelength
restrictions one can also determine which wavelengths are currently
in use. This parameter could potential be used with other
technologies that GMPLS currently covers or may cover in the future.
SharedBackupLabels is a set of labels (wavelengths) currently used
for shared backup protection on the link. An example usage of this
information in a WSON setting is given in [Shared]. This parameter
could potential be used with other technologies that GMPLS currently
covers or may cover in the future.
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3. YANG Model (Tree Structure)
[Editor's Note: This version did not make use of augmentation of
other modules. The augmentation of other modules will be considered
once other modules being developed have been well established and
can be used as a basis of this module.]
module: wson-topology
+--rw wson-topology
+--rw wson-topology* [wson-topology-id]
+--rw wson-topology-id wson-topology-id
+--rw name? string
+--rw wson-node* [wson-node-id]
+--rw wson-node-id wson-node-id
+--rw wson-interface* [wson-interface-id]
| +--rw wson-interface-id linkset-format
| +--rw wavelength-available-bitmap* uint32
+--rw connectivity-matrix* [matrix-id]
| +--rw matrix-id uint8
| +--rw device-type? devicetype
| +--rw dir? directionality
| +--rw format linkset-format
| +--rw matrix-interface* [in-port-id]
| +--rw in-port-id wson-interface-ref
| +--rw out-port-id wson-interface-ref
+--rw resource-pool* [resource-pool-id]
+--rw resource-pool-id uint32
+--rw pool-state boolean
+--rw matrix-interface* [in-port-id]
+--rw in-port-id wson-interface-ref
+--rw out-port-id wson-interface-ref
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4. WSON-RWA YANG Model
<CODE BEGINS>
module wson-topology {
namespace "urn:ietf:params:xml:ns:yang:wson-topology";
prefix wson;
import ietf-inet-types {
prefix inet;
}
organization
"IETF CCAMP Working Group";
contact
"Editor: Young Lee <leeyoung@huawei.com>";
description
"This module contains a collection of YANG definitions for
RWA WSON.
Copyright (c) 2015 IETF Trust and the persons identified as
authors of the code. All rights reserved.
Redistribution and use in source and binary forms, with or
without modification, is permitted pursuant to, and subject
to the license terms contained in, the Simplified BSD
License set forth in Section 4.c of the IETF Trust's Legal
Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info).";
revision 2015-03-05 {
description
"Initial revision.";
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reference
"RFC XXX: A Yang Data Model for WSON Optical Networks ";
}
typedef wson-topology-id {
type inet:uri;
description
"The WSON Topology ID";
}
typedef wson-node-id {
type inet:ip-address;
description
"The WSON Node ID";
}
typedef devicetype {
type enumeration {
enum adm {
value 1;
description
"Device is ADM";
}
enum roadm {
value 2;
description
"Device is ROAMD/OXC";
}
}
description
"device type: fixed (ADM) or switched (ROADM/OXC)";
}
typedef directionality {
type enumeration {
enum bidir {
value 0;
description
"bi-directional";
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}
enum input {
value 1;
description
"input direction";
}
enum output {
value 2;
description
"output direction";
}
}
description
"The directionality of link set";
}
typedef linkset-format {
type enumeration {
enum link-local-identifier{
value 1;
description
"";
}
enum local-interface-ipv4{
value 2;
description
"";
}
enum local-interface-ipv6{
value 3;
description
"";
}
}
description
"linkset type; link local/ipv4/ipv6";
}
typedef wson-interface-ref {
type leafref {
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path "/wson-topology/wson-topology/wson-node/" +
"wson-interface/wson-interface-id";
}
description
"This type is used by data models that need to
reference WSON interface.";
}
container wson-topology {
description
"TBD";
list wson-topology {
key "wson-topology-id";
description
"The WSON Topology";
leaf wson-topology-id {
type wson-topology-id;
description
"The WSON Topology Identifier";
}
leaf name {
type string;
description
"TBD";
}
list wson-node {
key "wson-node-id";
description
"The WSON node";
leaf wson-node-id {
type wson-node-id;
description
"The WSON Node ID";
}
list wson-interface {
key "wson-interface-id";
description
"The list of WSON Interface";
leaf wson-interface-id {
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type linkset-format;
description
"TBD";
}
leaf-list wavelength-available-bitmap {
type uint32;
description
"The list of available channels, correponding
to the bitmap in the info model.";
}
}
list connectivity-matrix {
key "matrix-id";
description
"connectivity-matrix of WSON node";
reference
"based on draft-ietf-ccamp-general-constraint-
encode";
leaf matrix-id {
type uint8;
description
"matrix identifier";
}
leaf device-type {
type devicetype;
description
"device type: fixed (ADM) or switched
(ROADM/OXC)";
}
leaf dir {
type directionality;
description
"bi-directionality or input or output
of link set";
}
leaf format {
type linkset-format;
description
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"format of identifier";
}
list matrix-interface {
key "in-port-id";
description
"matrix-interface describes input-ports
and out-ports around a connectivity
matrix";
leaf in-port-id {
type wson-interface-ref;
description
"The reference to in-port";
}
leaf out-port-id {
type wson-interface-ref;
description
"The reference to out-port";
}
}
}
list resource-pool {
key "resource-pool-id";
description
"The resource pool list";
leaf resource-pool-id {
type uint32;
description
"The resource pool ID";
}
leaf pool-state {
type boolean;
description
"TRUE is state UP; FALSE is state down";
}
list matrix-interface {
key "in-port-id";
description
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"pool is described as matrix-interface
with input-ports and output-ports
around the pool";
leaf in-port-id {
type wson-interface-ref;
description
"The reference to in-interface";
}
leaf out-port-id {
type wson-interface-ref;
description
"The reference to out-interface";
}
}
}
}
}
}
}
<CODE ENDS>
5. Security Considerations
TDB
6. IANA Considerations
TDB
7. Acknowledgments
This document was prepared using 2-Word-v2.0.template.dot.
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8. References
8.1. Normative References
[RFC7446] Y. Lee, G. Bernstein, D. Li, W. Imajuku, "Routing and
Wavelength Assignment Information Model for Wavelength
Switched Optical Networks", RFC 7446, Feburary 2015.
[Gen-Encode] G. Bernstein, Y. Lee, D. Li, W. Imajuku, "General
Network Element Constraint Encoding for GMPLS Controlled
Networks", work in progress: draft-ietf-ccamp-general-
constraint-encode.
[WSON-Encode] G. Bernstein, Y. Lee, D. Li, W. Imajuku, "Routing and
Wavelength Assignment Information Encoding for Wavelength
Switched Optical Networks", work in progress: draft-ietf-
ccamp-rwa-wson-encode.
8.2. Informative References
9. Contributors
Xian Zhang
Huawei Technologies
Email: zhang.xian@huawei.com
Authors' Addresses
Young Lee (ed.)
Huawei Technologies
5340 Legacy Drive, Building 3
Plano, TX 75023
USA
Phone: (469) 277-5838
Email: leeyoung@huawei.com
Dhruv Dhody
Huawei Technologies India Pvt. Ltd,
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Near EPIP Industrial Area, Kundalahalli Village, Whitefield,
Bangalore - 560 037 [H1-2A-245]
Email: dhruv.dhody@huawei.com
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