A YANG Data Model for Optical Network Inventory
draft-yg3bp-ccamp-optical-inventory-yang-00
The information below is for an old version of the document.
| Document | Type |
This is an older version of an Internet-Draft whose latest revision state is "Replaced".
|
|
|---|---|---|---|
| Authors | Chaode Yu , Italo Busi , Aihua Guo , Sergio Belotti , Jean-Francois Bouquier , Fabio Peruzzini , Oscar Gonzalez de Dios , Victor Lopez | ||
| Last updated | 2021-10-25 | ||
| Replaced by | draft-yg3bp-ccamp-network-inventory-yang | ||
| RFC stream | (None) | ||
| Formats | |||
| Stream | Stream state | (No stream defined) | |
| Consensus boilerplate | Unknown | ||
| RFC Editor Note | (None) | ||
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| Send notices to | (None) |
draft-yg3bp-ccamp-optical-inventory-yang-00
CCAMP Working Group C. Yu
Internet-Draft I. Busi
Intended status: Standards Track Huawei Technologies
Expires: 28 April 2022 A. Guo
Futurewei Technologies
S. Belotti
Nokia
J-F. Bouquier
Vodafone
F. Peruzzini
TIM
O.G.d. Dios
Telefonica
V. Lopez
Nokia
25 October 2021
A YANG Data Model for Optical Network Inventory
draft-yg3bp-ccamp-optical-inventory-yang-00
Abstract
This document defines a YANG data model for optical network inventory
data information.
The YANG data model presented in this document is intended to be used
as the basis toward a generic YANG data model for network inventory
data information which can be augmented, when required, with
technology-specific (e.g., optical) inventory data, to be defined
either in a future version of this document or in another document.
The YANG data model defined in this document conforms to the Network
Management Datastore Architecture (NMDA).
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at https://datatracker.ietf.org/drafts/current/.
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Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on 28 April 2022.
Copyright Notice
Copyright (c) 2021 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 (https://trustee.ietf.org/
license-info) in effect on the date of publication of this document.
Please review these documents carefully, as they describe your rights
and restrictions with respect to this document. Code Components
extracted from this document must include Simplified BSD License text
as described in Section 4.e of the Trust Legal Provisions and are
provided without warranty as described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Terminology and Notations . . . . . . . . . . . . . . . . 4
1.2. Tree Diagram . . . . . . . . . . . . . . . . . . . . . . 5
1.3. Prefix in Data Node Names . . . . . . . . . . . . . . . . 5
2. YANG Data Model for Optical Network Inventory . . . . . . . . 6
2.1. YANG Model Overview . . . . . . . . . . . . . . . . . . . 6
3. Optical Network Inventory Tree Diagram . . . . . . . . . . . 9
4. YANG Model for Optical Network Inventory . . . . . . . . . . 10
5. Manageability Considerations . . . . . . . . . . . . . . . . 16
6. Security Considerations . . . . . . . . . . . . . . . . . . . 17
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 17
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 17
8.1. Normative References . . . . . . . . . . . . . . . . . . 17
8.2. Informative References . . . . . . . . . . . . . . . . . 18
Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . 18
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 18
1. Introduction
Network inventory management is a key component in operators' OSS
architectures.
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Network inventory is a fundamental functionality in network
management and was specified many years ago. Given the emerging of
data models and their deployment in operator's management and control
systems, the traditional function of inventory management is also
requested to be defined as a data model.
Network inventory management and monitoring is a critical part of
ensuring the network stays healthy, well-planned, and functioning in
the operator's network. Network inventory management allows the
operator to keep track of what physical network devices are staying
in the network including relevant software and hardware.
The network inventory management also helps the operator to know when
to acquire new assets and what is needed, or to decommission old or
faulty ones, which can help to improve network performance and
capacity planning.
In [I-D.ietf-teas-actn-poi-applicability] a gap was identified
regarding the lack of a YANG data model that could be used at ACTN
MPI interface level to report whole/partial hardware inventory
information available at PNC level towards north-bound systems (e.g.,
MDSC or OSS layer).
[RFC8345] initial goal was to make possible the augmentation of the
YANG data model with network inventory data model but this was never
developed and the scope was kept limited to network topology data
only.
It is key for operators to drive the industry towards the use of a
standard YANG data model for network inventory data instead of using
vendors proprietary APIs (e.g., REST API).
In the ACTN architecture, this would bring also clear benefits at
MDSC level for packet over optical integration scenarios since this
would enable the correlation of the inventory information with the
links information reported in the network topology model.
The intention is to define a generic YANG data model that would be as
much as possible technology agnostic (valid for IP, optical and
microwave networks) and that could be augmented, when required, to
include some technology-specific inventory details.
[RFC8348] defines a YANG data model for the management of the
hardware on a single server and therefore it is more applicable to
the PNC South Bound Interface (SBI) towards the network elements
rather than at the PNC MPI. However, the YANG data model defined in
[RFC8348] has been used as a reference for defining the YANG network
inventory data model.
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For optical network inventory, the network inventory YANG data model
should support the use cases (4a and 4b) and requirements defined in
[ONF_TR-547], in order to guarantee a seamless integration at
MDSC/OSS/orchestration layers.
The proposed YANG data model has been analysed to cover the
requirements and use cases for Optical Network Inventory.
Being based on [RFC8348], this data model should be a good starting
point toward a generic data model and applicable to any technology.
However, further analysis of requirements and use cases is needed to
extend the applicability of this YANG data model to other types of
networks (IP and microwave) and to identify which aspects are generic
and which aspects are technology-specific for optical networks.
This document defines one YANG module: ietf-network-inventory.yang
(Section 4).
Note: review in future versions of this document the related modules,
depending on the augmentation relationship.
The YANG data model defined in this document conforms to the Network
Management Datastore Architecture [RFC8342].
1.1. Terminology and Notations
Refer to [RFC7446] and [RFC7581] for the key terms used in this
document. The following terms are defined in [RFC7950] and are not
redefined here:
* client
* server
* augment
* data model
* data node
The following terms are defined in [RFC6241] and are not redefined
here:
* configuration data
* state data
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The terminology for describing YANG data models is found in
[RFC7950].
TBD: Recap the concept of chassis/slot/component/board/... in
[TMF-MTOSI].
Following terms are used for the representation of the hierarchies in
the optical network inventory.
Network Element: a device installed on one or several shelves and can
afford some specific transmission function independently.
Cabinet: a holder of the device and provides power supply for the
device in it.
Chassis: a holder of the device installation.
Slot: a holder of the board.
Component: holders and equipments of the network element, including
rack, shelf, slot, sub-slot, board and port.
Board/Card: a pluggable equipment on the network element and can
afford a specific transmission function independently.
Port: an interface on board
1.2. Tree Diagram
A simplified graphical representation of the data model is used in
Section 3 of this document. The meaning of the symbols in these
diagrams is defined in [RFC8340].
1.3. Prefix in Data Node Names
In this document, names of data nodes and other data model objects
are prefixed using the standard prefix associated with the
corresponding YANG imported modules, as shown in the following table.
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+========+========================+===========+
| Prefix | Yang Module | Reference |
+========+========================+===========+
| ianahw | iana-hardware | [RFC8348] |
+--------+------------------------+-----------+
| ni | ietf-network-inventory | RFCXXX |
+--------+------------------------+-----------+
| yang | ietf-yang-types | [RFC6991] |
+--------+------------------------+-----------+
Table 1: Prefixes and corresponding YANG
modules
RFC Editor Note: Please replace XXXX with the RFC number assigned to
this document. Please remove this note.
2. YANG Data Model for Optical Network Inventory
2.1. YANG Model Overview
Based on TMF classification in [TMF-MTOSI], inventory objects can be
divided into two groups, holder group and equipment group. The
holder group contains rack, shelf, slot, sub-slot while the equipment
group contains network-element, board and port. With the requirement
of GIS and on-demand domain controller selection raised, the
equipment room becomes a new inventory object to be managed besides
TMF classification.
Logically, the relationship between these inventory objects can be
described by Figure 1 below:
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+-------------+
| inventory |
+-------------+
||
|| 1:N
\/
+----------------+
| equipment room |
+----------------+
||
||
_______1:N_________||_______1:M___________
||————————————————— ———————————————————||
|| ||
\/ \/
+------------+ +-----------------+
| rack | /__________M:N________\| network element |
+------------+ \---------------------/+-----------------+
|| || ||
|| 1:N || ||
\/ || ||
+------------+ /__________1:M____________|| ||
| shelf | \--------------------------| ||
+------------+ ||
||__________________ __________________||
|-------------------||-------------------|
_________1:N________||________1:M_________
||------------------ ------------------||
\/ \/
+---------------+ +-----------+
| slot/su-bslot | | board |
+---------------+ +-----------+
||
|| 1:N
\/
+-----------+
| port |
+-----------+
Figure 1: Relationship between inventory objects
In [RFC8348], rack, shelf, slot, sub-slot, board and port are defined
as components of network elements with generic attributes.
While [RFC8348] is used to manage the hardware of a single server
(e.g., a Network Element), the Network Inventory YANG data model is
used to retrieve the network inventory information that a controller
discovers from multiple Network Elements under its control.
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However, the YANG data model defined in [RFC8348] has been used as a
reference for defining the YANG network inventory data model. This
approach can simplify the implementation of this network inventory
model when the controller uses the YANG data model defined in
[RFC8348] to retrieve the hardware configuration from the network
elements under its control.
Note: review in future versions of this document which attributes
from [RFC8348] are required also for network inventory and whether
there are attributes not defined in [RFC8348]which are required for
network inventory
Note: review in future versions of this document whether to re-use
definitions from [RFC8348] or use schema-mount.
+--ro network-inventory
+--ro equipment-rooms
| +--ro equipment-room* [uuid]
| +--ro uuid yang:uuid
| ...................................
| +--ro rack* [uuid]
| +--ro uuid yang:uuid
| ...................................
| +--ro shelves* [uuid]
| +--ro uuid yang:uuid
| ...................................
| +--ro chassis-ref
| +--ro ne-ref? leafref
| +--ro component-ref? leafref
+--ro network-elements
+--ro network-element* [uuid]
+--ro uuid yang:uuid
...................................
+--ro components
+--ro component* [uuid]
+--ro uuid yang:uuid
...................................
The YANG data model for network inventory follows the same approach
of [RFC8348] and reports the network inventory as a list of
components of different types (e.g., chassis, module, port).
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+--ro components
+--ro component* [uuid]
+--ro uuid yang:uuid
+--ro name? string
+--ro description? string
+--ro class? identityref
+--ro parent-rel-pos? int32
+--ro children* [child-ref]
| +--ro child-ref -> ../../../../uuid
+--ro parent
+--ro parent-ref? -> ../../../../uuid
Note: review in future versions of this document whether the
component list should be under the network-inventory instead of under
the network-element container
However, considering there are some special scenarios, the
relationship between the rack and network elements is not 1 to 1 nor
1 to n. The network element cannot be the direct parent node of the
rack. So there should be n to m relationship between racks and
network elements. And the shelves in the rack should have some
reference information to the component.
Note that in [RFC8345], topology and inventory are two subsets of
network information. However, considering the complexity of the
existing topology models and to have a better extension capability,
we define a separate root for the inventory model. We will consider
some other ways to do some associations between the topology model
and inventory model in the future.
Note: review in future versions of this document whether network
inventory should be defined as an augmentation of the network model
defined in [RFC8345] instead of under a new network-inventory root.
The proposed YANG data model has been analysed to cover the
requirements and use cases for Optical Network Inventory.
Further analysis of requirements and use cases is needed to extend
the applicability of this YANG data model to other types of networks
(IP and microwave) and to identify which aspects are generic and
which aspects are technology-specific for optical networks.
3. Optical Network Inventory Tree Diagram
Figure 2 below shows the tree diagram of the YANG data model defined
in module ietf-network-inventory.yang (Section 4).
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module: ietf-network-inventory
+--ro network-inventory
+--ro equipment-rooms
| +--ro equipment-room* [uuid]
| +--ro uuid yang:uuid
| +--ro name? string
| +--ro location? string
| +--ro rack* [uuid]
| +--ro uuid yang:uuid
| +--ro name? string
| +--ro row-number? uint32
| +--ro rack-number? uint32
| +--ro shelves* [uuid]
| +--ro uuid yang:uuid
| +--ro name? string
| +--ro shelf-number? uint8
| +--ro chassis-ref
| +--ro ne-ref? leafref
| +--ro component-ref? leafref
+--ro network-elements
+--ro network-element* [uuid]
+--ro uuid yang:uuid
+--ro name? string
+--ro components
+--ro component* [uuid]
+--ro uuid yang:uuid
+--ro name? string
+--ro description? string
+--ro class? identityref
+--ro parent-rel-pos? int32
+--ro children* [child-ref]
| +--ro child-ref -> ../../../../uuid
+--ro parent
+--ro parent-ref? -> ../../../../uuid
Figure 2: Network inventory tree diagram
4. YANG Model for Optical Network Inventory
<CODE BEGINS> file "ietf-network-inventory@2021-10-25.yang"
module ietf-network-inventory {
yang-version 1.1;
namespace "urn:ietf:params:xml:ns:yang:ietf-network-inventory";
prefix ni;
import ietf-yang-types {
prefix yang;
reference
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"RFC6991: Common YANG Data Types.";
}
import iana-hardware {
prefix ianahw;
reference
"RFC 8348: A YANG Data Model for Hardware Management.";
}
organization
"IETF CCAMP Working Group";
contact
"WG Web: <https://datatracker.ietf.org/wg/ccamp/>
WG List: <mailto:ccamp@ietf.org>
Editor: Chaode Yu
<yuchaode@huawei.com>
Editor: Italo Busi
<italo.busi@huawei.com>
Editor: Aihua Guo
<aihuaguo.ietf@gmail.com>
Editor: Sergio Belotti
<sergio.belotti@nokia.com>
Editor: Jean-Francois Bouquier
<jeff.bouquier@vodafone.com>
Editor: Fabio Peruzzini
<fabio.peruzzini@telecomitalia.it>";
description
"This module defines a model for retrieving network inventory.
The model fully conforms to the Network Management
Datastore Architecture (NMDA).
Copyright (c) 2021 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
(https://trustee.ietf.org/license-info).
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This version of this YANG module is part of RFC XXXX; see
the RFC itself for full legal notices.
The key words 'MUST', 'MUST NOT', 'REQUIRED', 'SHALL', 'SHALL
NOT', 'SHOULD', 'SHOULD NOT', 'RECOMMENDED', 'NOT RECOMMENDED',
'MAY', and 'OPTIONAL' in this document are to be interpreted as
described in BCP 14 (RFC 2119) (RFC 8174) when, and only when,
they appear in all capitals, as shown here.";
// RFC Ed.: replace XXXX with actual RFC number and remove this
// note.
// RFC Ed.: update the date below with the date of RFC publication
// and remove this note.
revision 2021-10-25 {
description
"Initial revision.";
reference
"draft-yg3bp-ccamp-optical-inventory-yang-00: A YANG Data
Model for Optical Network Inventory.";
}
container network-inventory {
config false;
description
"The top-level container for the network inventory
information.";
uses equipment-rooms-grouping;
uses network-elements-grouping;
}
grouping common-entity-attributes {
description
"A set of attributes which are common to all the entities
(e.g., component, equipment room) defined in this module.";
leaf uuid {
type yang:uuid;
description
"Uniquely identifies an entity (e.g., component).";
}
leaf name {
type string;
description
"A name for an entity (e.g., component), as specified by
a network manager, that provides a non-volatile 'handle'
for the entity and that can be modified anytime during the
entity lifetime.
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If no configured value exists, the server MAY set the value
of this node to a locally unique value in the operational
state.";
}
}
grouping network-elements-grouping {
description
"The attributes of the network elements.";
container network-elements {
description
"The container for the list of network elements.";
list network-element {
key uuid;
description
"The list of network elements within the network.";
uses common-entity-attributes;
uses components-grouping;
}
}
}
grouping equipment-rooms-grouping {
description
"The attributes of the equipment rooms.";
container equipment-rooms {
description
"The container for the list of equipment rooms.";
list equipment-room {
key uuid;
description
"The list of equipment rooms within the network.";
uses common-entity-attributes;
leaf location {
type string;
description
"compared with the location information of the other
inventory objects, a GIS address is preferred for
equipment room";
}
list rack {
key uuid;
description
"The list of racks within an equipment room.";
uses common-entity-attributes;
leaf row-number {
type uint32;
description
"Identifies the row within the equipment room where
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the rack is located.";
}
leaf rack-number {
type uint32;
description
"Identifies the physical location of the rack within
the row.";
}
list shelves {
key uuid;
description
"The list of shelves within a rack.";
uses common-entity-attributes;
leaf shelf-number {
type uint8;
description
"Identifies the location of the shelf within the
rack.";
}
container chassis-ref {
description
"The reference to the network element component
representing this shelf.";
leaf ne-ref {
type leafref {
path "/ni:network-inventory/ni:network-elements"
+ "/ni:network-element/ni:uuid";
}
description
"The reference to the network element containing
the component.";
}
leaf component-ref {
type leafref {
path "/ni:network-inventory/ni:network-elements"
+ "/ni:network-element[ni:uuid"
+ "=current()/../ne-ref]/ni:components"
+ "/ni:component/ni:uuid";
}
description
"The reference to the component within the network
element.";
}
}
}
}
}
}
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}
grouping components-grouping {
description
"The attributes of the hardware components.";
container components {
description
"The container for the list of components.";
list component {
key uuid;
description
"The list of components within a network element.";
uses common-entity-attributes;
leaf description {
type string;
description
"A textual description of the component.";
reference
"RFC 8348: A YANG Data Model for Hardware Management.";
}
leaf class {
type identityref {
base ianahw:hardware-class;
}
description
"An indication of the general hardware type of the
component.";
reference
"RFC 8348: A YANG Data Model for Hardware Management.";
}
leaf parent-rel-pos {
type int32 {
range "0 .. 2147483647";
}
description
"An indication of the relative position of this child
component among all its sibling components. Sibling
components are defined as components that:
o share the same value of the 'parent' node and
o share a common base identity for the 'class' node.";
reference
"RFC 8348: A YANG Data Model for Hardware Management.";
}
list children {
key child-ref;
description
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"The child components that are physically contained by
this component.";
leaf child-ref {
type leafref {
path "../../../../ni:uuid";
}
description
"The reference to the child component.";
}
}
container parent {
description
"The parent component that physically contains this
component.
If this container is not instantiated, it indicates
that this component is not contained in any other
component.
In the event that a physical component is contained by
more than one physical component (e.g., double-wide
modules), this container contains the data of one of
these components. An implementation MUST use the same
component every time this container is instantiated.";
leaf parent-ref {
type leafref {
path "../../../../ni:uuid";
}
description
"The reference to the parent component.";
}
}
}
}
}
}
<CODE ENDS>
Figure 3: Network inventory YANG module
5. Manageability Considerations
<Add any manageability considerations>
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6. Security Considerations
<Add any security considerations>
7. IANA Considerations
<Add any IANA considerations>
8. References
8.1. Normative References
[RFC6241] Enns, R., Ed., Bjorklund, M., Ed., Schoenwaelder, J., Ed.,
and A. Bierman, Ed., "Network Configuration Protocol
(NETCONF)", RFC 6241, DOI 10.17487/RFC6241, June 2011,
<https://www.rfc-editor.org/info/rfc6241>.
[RFC6991] Schoenwaelder, J., Ed., "Common YANG Data Types",
RFC 6991, DOI 10.17487/RFC6991, July 2013,
<https://www.rfc-editor.org/info/rfc6991>.
[RFC7446] Lee, Y., Ed., Bernstein, G., Ed., Li, D., and W. Imajuku,
"Routing and Wavelength Assignment Information Model for
Wavelength Switched Optical Networks", RFC 7446,
DOI 10.17487/RFC7446, February 2015,
<https://www.rfc-editor.org/info/rfc7446>.
[RFC7581] Bernstein, G., Ed., Lee, Y., Ed., Li, D., Imajuku, W., and
J. Han, "Routing and Wavelength Assignment Information
Encoding for Wavelength Switched Optical Networks",
RFC 7581, DOI 10.17487/RFC7581, June 2015,
<https://www.rfc-editor.org/info/rfc7581>.
[RFC7950] Bjorklund, M., Ed., "The YANG 1.1 Data Modeling Language",
RFC 7950, DOI 10.17487/RFC7950, August 2016,
<https://www.rfc-editor.org/info/rfc7950>.
[RFC8340] Bjorklund, M. and L. Berger, Ed., "YANG Tree Diagrams",
BCP 215, RFC 8340, DOI 10.17487/RFC8340, March 2018,
<https://www.rfc-editor.org/info/rfc8340>.
[RFC8342] Bjorklund, M., Schoenwaelder, J., Shafer, P., Watsen, K.,
and R. Wilton, "Network Management Datastore Architecture
(NMDA)", RFC 8342, DOI 10.17487/RFC8342, March 2018,
<https://www.rfc-editor.org/info/rfc8342>.
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[RFC8348] Bierman, A., Bjorklund, M., Dong, J., and D. Romascanu, "A
YANG Data Model for Hardware Management", RFC 8348,
DOI 10.17487/RFC8348, March 2018,
<https://www.rfc-editor.org/info/rfc8348>.
[TMF-MTOSI]
TM Forum (TMF), "TMF MTOSI 4.0 Equipment Model", TMF
SD2-20_EquipmentModel , 2008,
<https://www.tmforum.org/resources/suite/mtosi-4-0/>.
8.2. Informative References
[I-D.ietf-teas-actn-poi-applicability]
Peruzzini, F., Bouquier, J., Busi, I., King, D., and D.
Ceccarelli, "Applicability of Abstraction and Control of
Traffic Engineered Networks (ACTN) to Packet Optical
Integration (POI)", Work in Progress, Internet-Draft,
draft-ietf-teas-actn-poi-applicability-03, 12 July 2021,
<https://www.ietf.org/archive/id/draft-ietf-teas-actn-poi-
applicability-03.txt>.
[ONF_TR-547]
Open Networking Foundation (ONF), "TAPI v2.1.3 Reference
Implementation Agreement", ONF TR-547 TAPI RIA v1.0 , July
2020, <https://opennetworking.org/wp-
content/uploads/2020/08/TR-547-TAPI-v2.1.3-Reference-
Implementation-Agreement-1.pdf>.
[RFC8345] Clemm, A., Medved, J., Varga, R., Bahadur, N.,
Ananthakrishnan, H., and X. Liu, "A YANG Data Model for
Network Topologies", RFC 8345, DOI 10.17487/RFC8345, March
2018, <https://www.rfc-editor.org/info/rfc8345>.
Acknowledgments
The authors of this document would like to thank the authors of
[I-D.ietf-teas-actn-poi-applicability] for having identified the gap
and requirements to trigger this work.
This document was prepared using kramdown.
Authors' Addresses
Chaode Yu
Huawei Technologies
Email: yuchaode@huawei.com
Yu, et al. Expires 28 April 2022 [Page 18]
Internet-Draft Optical Inventory YANG October 2021
Italo Busi
Huawei Technologies
Email: italo.busi@huawei.com
Aihua Guo
Futurewei Technologies
Email: aihuaguo.ietf@gmail.com
Sergio Belotti
Nokia
Email: sergio.belotti@nokia.com
Jean-Francois Bouquier
Vodafone
Email: jeff.bouquier@vodafone.com
Fabio Peruzzini
TIM
Email: fabio.peruzzini@telecomitalia.it
Oscar Gonzalez de Dios
Telefonica
Email: oscar.gonzalezdedios@telefonica.com
Victor Lopez
Nokia
Email: victor.lopez@nokia.com
Yu, et al. Expires 28 April 2022 [Page 19]