CCAMP Working Group Y. Lee (Editor)
D. Dhody
X. Zhang
Internet Draft Huawei
Intended status: Standard Track A. Guo
ADVA
V. Lopez
Telefonica
D. King
U. of Lancaster
B. Yoon
ETRI
Expires: June 15, 2016 December 16, 2015
A Yang Data Model for WSON Optical Networks
draft-lee-ccamp-wson-yang-04.txt
Abstract
This document provides a YANG data model for the routing and wavelength assignment
(RWA) TE topology in wavelength switched optical networks (WSONs).
Status of this Memo
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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 Provisions Relating
to IETF Documents (http://trustee.ietf.org/license-info) in effect on the date of
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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 .............................. 8
3. YANG Model (Tree Structure)....................................... 9
4. WSON-RWA YANG Model ............................................ 10
5. Security Considerations ......................................... 15
6. IANA Considerations ............................................ 15
7. Acknowledgments ............................................... 15
8. References ................................................... 16
8.1. Normative References ....................................... 16
8.2. Informative References ..................................... 16
9. Contributors .................................................. 16
Authors' Addresses ............................................... 16
1. Introduction
This document provides a YANG data model for the routing and wavelength assignment
(RWA) Traffic Engineering (TE) topology 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 documents [RFC7581] and [RFC7579] that developed protocol independent
encodings based on [RFC7446]. This document augments the generic TE topology draft
[TE-TOPO].
What is not in scope of this document is both impairment-aware WSON and flex-grid.
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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 [RWA-Info] 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.
<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.
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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>
[<ConnectivityMatrix>...]
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[<ResourcePool>]
Where
<ResourcePool> ::= <ResourceBlockInfo>...
[<ResourceAccessibility>...]
[<ResourceWaveConstraints>...]
[<RBPoolState>]
<ResourceAccessibility> ::= <PoolInputMatrix>
<PoolOutputMatrix>
<ResourceWaveConstraints> ::= <InputWaveConstraints>
<OutputOutputWaveConstraints>
<RBSharedAccessWaveAvailability> ::= [<InAvailableWavelengths>]
[<OutAvailableWavelengths>]
<RBPoolState> ::= <ResourceBlockID>
<NumResourcesInUse>
[<RBSharedAccessWaveAvailability>]
[<RBPoolState>]
<ResourceBlockInfo> ::= <ResourceBlockSet>
[<InputConstraints>]
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[<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.
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
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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.
3. YANG Model (Tree Structure)
(Editor's Note: This version is based on the augmentation of draft-ietf-teas-yang-
te-topo [TE-TOPO].)
module: ietf-wson-topology
augment /tet:te-topologies/tet:topology/tet:topology-types/tet:te-topology:
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+--rw wson-topology
augment /tet:te-topologies/tet:topology/tet:node/tet:te-node-
attributes/tet:connectivity-matrix:
+--rw wson-matrix
+--rw device-type? devicetype
+--rw dir? directionality
+--rw matrix-interface* [in-port-id]
+--rw in-port-id wson-interface-ref
+--rw out-port-id? wson-interface-ref
augment /tet:te-topologies/tet:topology/tet:node/tet:te-node-attributes/tet:te-
link:
+--rw wavelength-available-bitmap* boolean
augment /tet:te-topologies/tet:topology/tet:node:
+--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
4. WSON-RWA YANG Model
<CODE BEGINS> file "ietf-wson-topology@2015-10-14.yang"
module ietf-wson-topology {
namespace "urn:ietf:params:xml:ns:yang:ietf-wson-topology";
prefix wson;
import ietf-inet-types {
prefix inet;
}
import ietf-te-topology {
prefix "tet";
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}
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 2015-10-14 {
description
"version 2.";
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";
}
}
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description
"device type: fixed (ADM) or switched (ROADM/OXC)";
}
typedef directionality {
type enumeration {
enum bidir {
value 0;
description
"bi-directional";
}
enum input {
value 1;
description
"input direction";
}
enum output {
value 2;
description
"output direction";
}
}
description
"The directionality of link set";
}
typedef wson-interface-ref {
type leafref {
path "/tet:te-topologies/tet:topology/tet:node"
+ "/tet:te-node-attributes/tet:te-link"
+ "/tet:te-link-id";
}
description
"This type is used by data models that need to
reference WSON interface.";
}
augment "/tet:te-topologies/tet:topology/tet:topology-types"
+ "/tet:te-topology" {
description "WSON augmentation.";
container wson-topology{
description
"An empty WSON container to identify
the topology type.";
}
}
augment "/tet:te-topologies/tet:topology/tet:node"
+"/tet:te-node-attributes"
+"/tet:connectivity-matrix" {
when "/tet:te-topologies/tet:topology/tet:topology-types"
+"/tet:te-topology/wson-topology" {
description
"This augment is only valid for WSON.";
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}
description "WSON Connectivity Matrix augmentation.";
container wson-matrix{
description "WSON specific Matrix.";
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";
}
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";
}
}
}
}
augment "/tet:te-topologies/tet:topology/tet:node"
+ "/tet:te-node-attributes/tet:te-link" {
when "/tet:te-topologies/tet:topology/tet:topology-types"
+"/tet:te-topology/wson-topology" {
description
"This augment is only valid for WSON.";
}
description "WSON Link augmentation.";
leaf-list wavelength-available-bitmap {
type boolean;
description
"array of bits (i.e., bitmap) that indicates
if a wavelength is available or not on each
channel.";
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}
}
augment "/tet:te-topologies/tet:topology/tet:node" {
when "/tet:te-topologies/tet:topology/tet:topology-types"
+"/tet:te-topology/wson-topology" {
description
"This augment is only valid for WSON.";
}
description "WSON Node augmentation.";
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
"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>
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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.
[RFC7579] G. Bernstein, Y. Lee, D. Li, W. Imajuku, "General Network Element
Constraint Encoding for GMPLS Controlled Networks", RFC 7579, June
2015.
[RFC7581] G. Bernstein, Y. Lee, D. Li, W. Imajuku, "Routing and Wavelength
Assignment Information Encoding for Wavelength Switched Optical
Networks", RFC 7581, June 2015.
[TE-TOPO] X. Liu, et al., "YANG Data Model for TE Topologies", work in progress:
draft-ietf-teas-yang-te-topo.
8.2. Informative References
9. Contributors
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,
Near EPIP Industrial Area, Kundalahalli Village, Whitefield,
Bangalore - 560 037 [H1-2A-245]
Email: dhruv.dhody@huawei.com
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Xian Zhang
Huawei Technologies
Email: zhang.xian@huawei.com
Aihua Guo
ADVA
Email: AGuo@advaoptical.com
Victor Lopez
Telefonica
Email: victor.lopezalvarez@telefonica.com
Daniel King
University of Lancaster
Email: d.king@lancaster.ac.uk
Bin Yeong Yoon
ETRI
218 Gaijeongro, Yuseong-gu
Daejeon, Korea
Email: byyun@etri.re.kr
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