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An Inventory Management Model for Enterprise Networks
draft-wzwb-opsawg-network-inventory-management-01

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Document Type
This is an older version of an Internet-Draft whose latest revision state is "Expired".
Authors Bo Wu , Cheng Zhou , Qin Wu , Mohamed Boucadair
Last updated 2023-02-10
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draft-wzwb-opsawg-network-inventory-management-01
OPSAWG                                                             B. Wu
Internet-Draft                                                    Huawei
Intended status: Standards Track                                 C. Zhou
Expires: 14 August 2023                                     China Mobile
                                                                   Q. Wu
                                                                  Huawei
                                                            M. Boucadair
                                                                  Orange
                                                        10 February 2023

         An Inventory Management Model for Enterprise Networks
           draft-wzwb-opsawg-network-inventory-management-01

Abstract

   This document defines a YANG model for network inventory management,
   which provides consistent representation and reporting of network
   nodes (including endpoints) inventory and enable a network
   orchestrator in the enterprise network to maintain a centralized view
   of all the endpoint types across multiple domains of the underlying
   network to implement a coherent control strategy.

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/.

   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 14 August 2023.

Copyright Notice

   Copyright (c) 2023 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.

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   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 Revised BSD License text as
   described in Section 4.e of the Trust Legal Provisions and are
   provided without warranty as described in the Revised BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   3
   3.  Sample Use Cases  . . . . . . . . . . . . . . . . . . . . . .   4
     3.1.  Inventory Classification and Characteristics  . . . . . .   5
     3.2.  Inventory Management Process  . . . . . . . . . . . . . .   6
     3.3.  Network Wide Policy Management  . . . . . . . . . . . . .   6
     3.4.  The example Digital Twin Network  . . . . . . . . . . . .   7
   4.  Model Overview  . . . . . . . . . . . . . . . . . . . . . . .   8
   5.  YANG Data model for Network Inventory Management  . . . . . .   9
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  25
   7.  Privacy Considerations  . . . . . . . . . . . . . . . . . . .  25
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  25
   9.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  26
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  26
     10.1.  Normative References . . . . . . . . . . . . . . . . . .  26
     10.2.  Informative References . . . . . . . . . . . . . . . . .  27
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  28

1.  Introduction

   Enterprise networks are becoming heterogenous and supporting a
   variety of device types, such as BYOD vs. enterprise-supplied
   devices, Internet of things (IoT) devices, IP phones, printers, IP
   cameras), OT (Operation Technology) devices (e.g., sensors), etc.
   Also, these networks are designed to support both localized
   applications and cloud-based applications (e.g., public cloud
   computing, storage, etc.), or hybrid applications.  Also, means to
   access network resources are not anymore from within specific sites,
   but access can be granted from anywhere.  Dedicated gateways and
   authorization procedures are being generalized.

   This trend is observed for the medical, power, manufacturing, or
   other infrastructure industries.  These networks host a large number
   of multi-vendor IoT or OT devices, with frequent additions and
   changes.  These complex environments often expose unknown safety and
   reliability blind spots.

   The endpoints connected to an Enterprise network lack unified
   modelling and lifecycle management, and different services are
   modelled, collected, processed, and stored separately.  The same

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   category of network device and network endpoints may be (repeatedly)
   discovered, processed, and stored.  Therefore, the inventory is
   difficult to manage when they are tracked in different places.
   Maintaining a centralized and up-to-date inventory is a technical
   enabler in order to implement a coherent control strategy for all
   endpoint types connected to an Enterprise network.

   [RFC8345] defines a network topology model that can be used for
   network inventory extensions.  The SAP network model
   [I-D.ietf-opsawg-sap] provides inventory data associated with Service
   Attachment Points (SAPs), which maintains an inventory of nodes
   contained in a network relying upon [RFC8345].  For the enterprise
   networks, the network endpoint and the network context with the
   endpoints need to be further defined.

   This document defines a YANG network model for inventory management,
   which provide consistent representation and reporting of network
   inventory types.

   Note: The following needs to be clarified:

   X.  Why This Model Is Needed?

   <<Include a summary of why existing models do not fit the need>>

   [RFC8345] defines a network topology model that can be used for
   network inventory extensions.  The SAP network model
   [I-D.ietf-opsawg-sap] provides inventory data associated with Service
   Attachment Points (SAPs), which maintains an inventory of nodes
   contained in a network relying upon [RFC8345].

   X.  Why This Model is Specific to Enterprises?

   <<include a discussion on the specificity of endpoints>>

2.  Requirements Language

   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 [RFC2119][RFC8174] when, and only when, they appear in all
   capitals, as shown here.

   This document defines the following term:

   Network Inventory:  Provides a representation of entities either as a

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      network device, security device or network endpoint device, which
      include physical or virtual.  It provides information related to
      devices, which could include hardware components, software/
      firmware information and management information relevant for the
      device.  Network endpoints, physical or virtual, include physical
      computing equipment, e.g. physical servers in data centers,
      desktop computers, mobile devices, laptops, printers, sensors, and
      cloud-based endpoints, such as Software-as-a-Service (SaaS)
      applications, IaaS computing, storage, etc.

3.  Sample Use Cases

   The YANG model of network inventory is used to provide abstract
   interfaces to obtain network inventory under each network management
   systems or network controllers of different domains of an enterprise.

   Figure 1 shows an example of an enterprise network consisting of two
   network domains: one campus network domain and one cloud network
   domain.  The inventory data in the network can include network
   infrastructure devices (such as routers, switchs, security devices)
   and network endpoints (such as IoT/OT devices, servers, laptop,
   mobile devices).  The management systems or network controllers in
   different domains can automatically collect or discover the inventory
   by multiple approaches.

              +-------------------------------------+
              | Service/network   Orchestration     |
              +-------------------------------------+
                  |                               |
                  |     network inventory model   |
                  |                               |
                  |                               |
          +----------------+              +----------------+
          | Campus manager |              | SD-WAN manager |
          +----------------+              +-------+--------+
                  |                               |
                  |                               |
                  |                               |
    +-------------------------+            +------+--------------------+
    |     Campus Domain #1    |            |     Cloud network         |
    |                         |            |                           |
    |-------+  +-----------+  |            | +-----------+   +-------+ |
    |+IT/OTs+- +  Router   +--+---------   +-+vRouter    +---+Service| |
    |-------+  +-----------+  |            | ------------+   +-------+ |
    |                         |            |                           |
    |Site A                   |            |             Cloud Site B  |
    +-------------------------+            +---------------------------+

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          Figure 1: An Example of Enterprise Network Management

   With the inventory data collected from the underlying network, the
   network orchestration system can centrally manage security and
   network policies related to network endpoints.  Figure 2 shows an
   enterprise network function abstraction, in which centralized network
   policy management is on top of the network inventory and other
   network and security functions to achieve a specific set of network
   outcomes.  For example, the use cases can continuously ensure the
   security of enterprise networks or optimized traffic engineering in
   order to meet the performance requirements of business critical
   applications.

       +---------------+  +-------------+
       |               |  |             |
       |Access Policies|  |Service SLA  |
       |               |  |Policies     |
       |               |  |             |
       +---------------+  +-------------+
       - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
         Network Inventory model
       +---------+ +----------+ +-----------------------------------+
       |         | |          | | Endpoint                          |
       | Network | | Security | | servers,desktop computers,        |
       | devices | | devices  | | mobile devices,cloud endpoints ...|
       +---------+ +----------+ +-----------------------------------+

                  Figure 2: Enterprise Network Abstraction

3.1.  Inventory Classification and Characteristics

   The network inventory defined in this document can be further
   classified into network nodes and network endpoints.  The network
   nodes include network devices (e.g., routers, security devices).  The
   network endpoints include IT devices, IoT devices, OT devices,
   personal owned devices, or cloud applications.  The inventory can be
   managed with better control by categorizing and organizing them into
   custom groups based on a set of criteria local to each Enterprise.

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   The network inventory provides a set of common device attributes
   consisting of manufacturer, model, operating system, serial number,
   and more information.  The attributes can include both hardware and
   software data.  The hardware data is from IETF hardware YANG which
   includes hardware specifications, firmware and software versions
   installed on them, asset-ids, and status.  Software data could be
   operating system, operating system update, software module, etc.  The
   attributes can also provide network context information about the
   interconnection relationship between network devices and the location
   or underlaying devices of the network endpoint to access the network.

3.2.  Inventory Management Process

   Systems that provide network inventory usually involves the following
   steps:

      Identification: The first step is to create a detailed inventory
      of all network devices and network endpoints.  The systems should
      automatically discover each device or endpoint when connected.

      Tracking: This involves continuously monitoring, including
      gathering status, identifying new devices in the network,and
      traffic patterns.  By establishing the process, the system gets
      real-time data on the state of all the inventory.

3.3.  Network Wide Policy Management

   Policy Management provides policy-based access control on requested
   resources, such as user, device access, east west communication
   between network endpoints.

   Knowing the list of software or hardware/firmware installed on
   network devices and network endpoints, is useful to understand and
   maintain the security state and healthy state of a network
   infrastructure.  For example, if an enterprise policy requires the
   presence of certain software and prohibits the presence of other
   software, reported software installation information can be used to
   indicate compliance and non-compliance with these requirements.
   Software/hardware/firmware installation inventory lists can further
   be used to determine a network equipment's exposure to attack based
   on comparison of vulnerability or threat alerts against identified
   security profile data.

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3.4.  The example Digital Twin Network

   [I-D.irtf-nmrg-network-digital-twin-arch] defines "digital twin
   network" as a virtual representation of the physical network.  Such
   virtual representation of the network is meant to be used to analyze,
   diagnose, emulate, and then manage the physical network based on
   data, models, and interfaces.  A digital twin network architecture is
   proposed as follows.

           +---------------------------------------------------------+
           |   +-------+   +-------+          +-------+              |
           |   | App 1 |   | App 2 |   ...    | App n |   Application|
           |   +-------+   +-------+          +-------+              |
           +-------------^-------------------+-----------------------+
                         |Capability Exposure| Intent Input
                         |                   |
           +-------------+-------------------v-----------------------+
           |                        Instance of Digital Twin Network |
           |  +--------+   +------------------------+   +--------+   |
           |  |        |   | Service Mapping Models |   |        |   |
           |  |        |   |  +------------------+  |   |        |   |
           |  | Data   +--->  |Functional Models |  +---> Digital|   |
           |  | Repo-  |   |  +-----+-----^------+  |   | Twin   |   |
           |  | sitory |   |        |     |         |   | Network|   |
           |  |        |   |  +-----v-----+------+  |   |  Mgmt  |   |
           |  |        <---+  |  Basic Models    |  <---+        |   |
           |  |        |   |  +------------------+  |   |        |   |
           |  +--------+   +------------------------+   +--------+   |
           +--------^----------------------------+-------------------+
                    |                            |
                    | data collection            | control
           +--------+----------------------------v-------------------+
           |                   Physical Network                      |
           |                                                         |
           +---------------------------------------------------------+

   The service orchestration system can use digital twin platform to
   build visual relationship maps for networks and endpoints with
   relationship types and dependencies, and identify potential impacts
   on configuration management information from incidents, problems, and
   changes.

   The inventory model can, for example, be used to emulate several
   what-if scenario such as the impact of EOL or depletion of a hardware
   component on the network resilience and service availability.

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4.  Model Overview

   The following tree diagram [RFC8340] provides an overview of the data
   model for "ietf-network-inventory" module.

   module: ietf-network-inventory
     augment /nw:networks/nw:network/nw:network-types:
       +--rw network-inventory!
     augment /nw:networks/nw:network/nw:node:
       +--rw name?                      string
       +--ro node-type?                 identityref
       +--ro is-virtual?                boolean
       +--ro is-gateway?                boolean
       +--ro gateway-ref?               -> ../name
       +--rw management-ipv4-address?   inet:host
       +--rw management-ipv6-address?   inet:host
       +--ro mac-address?               yang:mac-address
       +--ro mud-url?                   inet:uri
       +--ro transparency-info?         inet:uri
       +--rw site?                      string
       +--ro hardware-rev?              string
       +--ro firmware-rev?              string
       +--ro software-rev?              string
       +--ro serial-num?                string
       +--ro mfg-name?                  string
       +--ro model-name?                string
       +--ro alias?                     string
       +--ro asset-id?                  string
       +--ro mfg-date?                  yang:date-and-time
       +--ro uri*                       inet:uri
       +--ro uuid?                      yang:uuid
       +--ro oper-state?                oper-state
       +--rw components
       |  +--rw component* [name]
       |     +--rw name              string
       |     +--ro class?            union
       |     +--ro parent?           -> ../../component/name
       |     +--ro parent-rel-pos?   int32
       |     +--ro is-fru?           boolean
       |     +--ro hardware-rev?     string
       |     +--ro firmware-rev?     string
       |     +--ro software-rev?     string
       |     +--ro serial-num?       string
       |     +--ro mfg-name?         string
       |     +--ro model-name?       string
       |     +--ro alias?            string
       |     +--ro asset-id?         string
       |     +--ro mfg-date?         yang:date-and-time

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       |     +--ro uri*              inet:uri
       |     +--ro uuid?             yang:uuid
       |     +--ro oper-state?       oper-state
       |     +--ro usage-state?      hw:usage-state
       |     +--ro alarm-state?      hw:alarm-state
       |     +--ro standby-state?    hw:standby-state
       +--rw geo-location
          +--rw reference-frame
          |  +--rw alternate-system?    string {alternate-systems}?
          |  +--rw astronomical-body?   string
          |  +--rw geodetic-system
          |     +--rw geodetic-datum?    string
          |     +--rw coord-accuracy?    decimal64
          |     +--rw height-accuracy?   decimal64
          +--rw (location)?
          |  +--:(ellipsoid)
          |  |  +--rw latitude?    decimal64
          |  |  +--rw longitude?   decimal64
          |  |  +--rw height?      decimal64
          |  +--:(cartesian)
          |     +--rw x?           decimal64
          |     +--rw y?           decimal64
          |     +--rw z?           decimal64
          +--rw velocity
          |  +--rw v-north?   decimal64
          |  +--rw v-east?    decimal64
          |  +--rw v-up?      decimal64
          +--rw timestamp?         yang:date-and-time
          +--rw valid-until?       yang:date-and-time
     augment /nw:networks/nw:network/nt:link:
       +--ro link-name?          string
       +--ro link-description?   string
       +--ro link-type?          string
       +--ro oper-state?         oper-state
     augment /nw:networks/nw:network/nw:node/nt:termination-point:
       +--ro tp-name?          string
       +--ro tp-description?   string
       +--ro tp-type?          string
       +--ro oper-state?       oper-state

5.  YANG Data model for Network Inventory Management

   The "ietf-network-inventory" module uses types defined in [RFC6991],
   [RFC8345], [RFC8348], and [RFC9179].

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   <CODE BEGINS>
    file="ietf-network-inventory@2023-02-10.yang"
   module ietf-network-inventory {
     yang-version 1.1;
     namespace "urn:ietf:params:xml:ns:yang:ietf-network-inventory";
     prefix nw-inv;

     import ietf-network {
       prefix nw;
       reference
         "RFC 8345: A YANG Data Model for Network Topologies";
     }
     import ietf-network-topology {
       prefix nt;
       reference
         "RFC 8345: A YANG Data Model for Network Topologies";
     }
     import ietf-inet-types {
       prefix inet;
       reference
         "RFC 6991: Common YANG Data Types";
     }
     import ietf-yang-types {
       prefix yang;
       reference
         "RFC 6991: Common YANG Data Types";
     }
     import iana-hardware {
       prefix ianahw;
       reference
         "RFC 8348: A YANG Data Model for Hardware Management";
     }
     import ietf-hardware {
       prefix hw;
       reference
         "RFC 8348: A YANG Data Model for Hardware Management";
     }
     import ietf-geo-location {
       prefix geo;
       reference
         "RFC 9179: A YANG Grouping for Geographic Locations";
     }
     import iana-if-type {
       prefix ianaift;
     }

     organization
       "IETF OPSAWG (Operations and Management Area Working Group)";

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     contact
       "WG Web:   <https://datatracker.ietf.org/wg/opsawg/>
        WG List:  <mailto:opsawg@ietf.org>

        Editor: Bo Wu
             <lana.wubo@huawei.com>
        Editor: Cheng Zhou
             <zhouchengyjy@chinamobile.com>
        Editor: Qin Wu
             <bill.wu@huawei.com>
        Editor: Mohamed Boucadair
             <mohamed.boucadair@orange.com>";
     description
       "This YANG module defines XXX.

        Copyright (c) 2023 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 Revised
        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).

        This version of this YANG module is part of RFC XXXX
        (https://www.rfc-editor.org/info/rfcXXXX); see the RFC
        itself for full legal notices.";

     revision 2023-02-10 {
       description
         "Initial revision.";
       reference
         "RFC XXXX: A Network Inventory Management Model for
          Enterprise Networks ";
     }

     identity software-component {
       description
         "Base identity for software components in a managed device.";
     }

     identity operating-system {
       base software-component;
       description
         "OS software type.";
     }

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     identity operating-system-patch {
       base software-component;
       description
         "An operating system update - which should be a subcomponent
          of the `operating-system` running on a component. A patch is
          defined to be a set of software changes that are atomically
          installed (and uninstalled) together. ";
     }

     identity bios {
       base software-component;
       description
         "Legacy BIOS or UEFI firmware interface responsible for
          initializing hardware components and first stage boot
          loader.";
     }

     identity boot-loader {
       base software-component;
       description
         "Software layer responsible for loading and booting the
          device OS or network OS.";
     }

     identity software-module {
       base software-component;
       description
         "A base identity for software modules installed and/or
          running on the device.  Modules include user-space programs
          and kernel modules that provide specific functionality.
          A component with type SOFTWARE_MODULE should also have a
          module type that indicates the specific type of software
          module";
     }

     identity node-type {
       description
         "Base identity for node device type.";
     }

     identity switch {
       base node-type;
       description
         "Identity for switch device.";
     }

     identity router {
       base node-type;

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       description
         "Identity for router device.";
     }

     identity firewall {
       base node-type;
       description
         "Identity for Firewall device.";
     }

     identity access-controller {
       base node-type;
       description
         "Identity for WIFI access controller device.";
     }

     identity access-point {
       base node-type;
       description
         "Identity for WIFI access point device.";
     }

     identity sdn-controller {
       base node-type;
       description
         "Identity for controller.";
     }

     identity server {
       base node-type;
       description
         "Identity for computing server device.";
     }

     identity vm {
       base node-type;
       description
         "Identity for VM node.";
     }

     identity camera {
       base node-type;
       description
         "Identity for camera device.";
     }

     identity printer {
       base node-type;

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       description
         "Identity for camera device.";
     }

     identity cell-phone {
       base node-type;
       description
         "Identity for mobile phone.";
     }

     typedef oper-state {
       type enumeration {
         enum unknown {
           value 1;
           description
             "The resource is unable to report its operational
              state.";
         }
         enum disabled {
           value 2;
           description
             "The resource is totally inoperable.";
         }
         enum enabled {
           value 3;
           description
             "The resource is partially or fully operable.";
         }
         enum testing {
           value 4;
           description
             "The resource is currently being tested and cannot
              therefore report whether or not it is operational.";
         }
       }
       description
         "Represents the possible values of operational states.";
       reference
         "RFC 4268: Entity State MIB - EntityOperState";
     }

     /* Groupings */

     grouping component-info {
       description
         "Grouping for common component information.";
       leaf hardware-rev {
         type string;

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         config false;
         description
           "The vendor-specific hardware revision string for the
            component.  The preferred value is the hardware revision
            identifier actually printed on the component itself (if
            present).";
         reference
           "RFC 6933: Entity MIB (Version 4) -
                      entPhysicalHardwareRev";
       }
       leaf firmware-rev {
         type string;
         config false;
         description
           "The vendor-specific firmware revision string for the
            component.";
         reference
           "RFC 6933: Entity MIB (Version 4) -
                      entPhysicalFirmwareRev";
       }
       leaf software-rev {
         type string;
         config false;
         description
           "The vendor-specific software revision string for the
            component.";
         reference
           "RFC 6933: Entity MIB (Version 4) -
                      entPhysicalSoftwareRev";
       }
       leaf serial-num {
         type string;
         config false;
         description
           "The vendor-specific serial number string for the
            component.  The preferred value is the serial number
            string actually printed on the component itself (if
            present).";
         reference
           "RFC 6933: Entity MIB (Version 4) - entPhysicalSerialNum";
       }
       leaf mfg-name {
         type string;
         config false;
         description
           "The name of the manufacturer of this physical component.
            The preferred value is the manufacturer name string
            actually printed on the component itself (if present).

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            Note that comparisons between instances of the
            'model-name', 'firmware-rev', 'software-rev', and
            'serial-num' nodes are only meaningful amongst
            components with the same value of 'mfg-name'.

            If the manufacturer name string associated with the
            physical component is unknown to the server, then this
            node is not instantiated.";
         reference
           "RFC 6933: Entity MIB (Version 4) - entPhysicalMfgName";
       }
       leaf model-name {
         type string;
         config false;
         description
           "The vendor-specific model name identifier string
            associated with this physical component.  The preferred
            value is the customer-visible part number, which may be
            printed on the component itself.
            If the model name string associated with the physical
            component is unknown to the server, then this node is not
            instantiated.";
         reference
           "RFC 6933: Entity MIB (Version 4) - entPhysicalModelName";
       }
       leaf alias {
         type string;
         config false;
         description
           "An 'alias' name for the component, as specified by a
            network manager, that provides a non-volatile 'handle' for
            the component.

            If no configured value exists, the server MAY set the
            value of this node to a locally unique value in the
            operational state.

            A server implementation MAY map this leaf to the
            entPhysicalAlias MIB object.  Such an implementation needs
            to use some mechanism to handle the differences in size
            and characters allowed between this leaf and
            entPhysicalAlias.  The definition of such a mechanism is
            outside the scope of this document.";
         reference
           "RFC 6933: Entity MIB (Version 4) - entPhysicalAlias";
       }
       leaf asset-id {
         type string;

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         config false;
         description
           "This node is a user-assigned asset tracking identifier for
            the component.

            A server implementation MAY map this leaf to the
            entPhysicalAssetID MIB object.  Such an implementation
            needs to use some mechanism to handle the differences in
            size and characters allowed between this leaf and
            entPhysicalAssetID.  The definition of such a mechanism is
            outside the scope of this document.";
         reference
           "RFC 6933: Entity MIB (Version 4) - entPhysicalAssetID";
       }
       leaf mfg-date {
         type yang:date-and-time;
         config false;
         description
           "The date of manufacturing of the managed component.";
         reference
           "RFC 6933: Entity MIB (Version 4) - entPhysicalMfgDate";
       }
       leaf-list uri {
         type inet:uri;
         config false;
         description
           "This node contains identification information about the
            component.";
         reference
           "RFC 6933: Entity MIB (Version 4) - entPhysicalUris";
       }
       leaf uuid {
         type yang:uuid;
         config false;
         description
           "A Universally Unique Identifier of the component.";
         reference
           "RFC 6933: Entity MIB (Version 4) - entPhysicalUUID";
       }
       leaf oper-state {
         type oper-state;
         config false;
         description
           "The operational state for this component.
            Note that this node does not follow the administrative
            state.  An administrative state of 'down' does not
            predict an operational state of 'disabled'.
            Note that some implementations may not be able to

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            accurately report oper-state while the admin-state node
            has a value other than 'unlocked'.  In these cases, this
            node MUST have a value of 'unknown'.";
         reference
           "RFC 4268: Entity State MIB - entStateOper";
       }
     }

     grouping components {
       description
         "Grouping for software and hardware components.";
       container components {
         description
           "The components within the device.";
         list component {
           key "name";
           description
             "The list of software instances contained within the
              device.";
           leaf name {
             type string;
             description
               "The name of the component.";
           }
           leaf class {
             type union {
               type identityref {
                 base ianahw:hardware-class;
               }
               type identityref {
                 base software-component;
               }
             }
             config false;
             description
               "Type of component as identified by the system";
           }
           leaf parent {
             type leafref {
               path "../../component/name";
             }
             config false;
             description
               "The name of the component that physically contains this
                component.

                If this leaf is not instantiated, it indicates that this
                component is not contained in any other component.

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                In the event that a physical component is contained by
                more than one physical component (e.g., double-wide
                modules), this node contains the name of one of these
                components.  An implementation MUST use the same name
                every time this node is instantiated.";
             reference
               "RFC 6933: Entity MIB (Version 4) -
                          entPhysicalContainedIn";
           }
           leaf parent-rel-pos {
             type int32 {
               range "0 .. 2147483647";
             }
             config false;
             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 6933: Entity MIB (Version 4) -
                          entPhysicalParentRelPos";
           }
           leaf is-fru {
             type boolean;
             config false;
             description
               "This node indicates whether or not this component is
                considered a 'field-replaceable unit' by the vendor.
                If this node contains the value 'true', then this
                component identifies a field-replaceable unit.";
             reference
               "RFC 6933: Entity MIB (Version 4) - entPhysicalIsFRU";
           }
           uses component-info;
           leaf usage-state {
             type hw:usage-state;
             config false;
             description
               "The usage state for this component.

                This node refers to a component's ability to service
                more components in a containment hierarchy.

                Some components will exhibit only a subset of the usage

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                state values.  Components that are unable to ever
                service any components within a containment hierarchy
                will always have a usage state of 'busy'.  In some
                cases, a component will be able to support only one
                other component within its containment hierarchy and
                will therefore only exhibit values of 'idle' and
                'busy'.";
             reference
               "RFC 4268: Entity State MIB - entStateUsage";
           }
           leaf alarm-state {
             type hw:alarm-state;
             config false;
             description
               "The alarm state for this component.  It does not
                include the alarms raised on child components within
                its containment hierarchy.";
             reference
               "RFC 4268: Entity State MIB - entStateAlarm";
           }
           leaf standby-state {
             type hw:standby-state;
             config false;
             description
               "The standby state for this component.

                Some components will exhibit only a subset of the
                remaining standby state values.  If this component
                cannot operate in a standby role, the value of this
                node will always be 'providing-service'.";
             reference
               "RFC 4268: Entity State MIB - entStateStandby";
           }
         }
       }
     }

     grouping inventory-network-type {
       description
         "Indicates the topology type to be inventory.";
       container network-inventory {
         presence "Indicates Network Inventory.";
         description
           "The presence of the container node indicates
            Network Inventory.";
       }
     }

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     grouping inventory-node-attributes {
       description
         "Augment used to define attach the node configuration";
       leaf name {
         type string;
         description
           "The name of the node.";
       }
       leaf node-type {
         type identityref {
           base node-type;
         }
         config false;
         description
           "Node type.";
       }
       leaf is-virtual {
         type boolean;
         default "false";
         config false;
         description
           "Set to true if the node is virtual.
            Set to false if the node is physical.";
       }
       leaf is-gateway {
         type boolean;
         default "false";
         config false;
         description
           "Set to true if the node is a gateway.
            Set to false if the node is not a gateway.";
       }
       leaf gateway-ref {
         type leafref {
           path "../name";
         }
         config false;
         description
           "gateway for endpoint device.";
       }
       leaf management-ipv4-address {
         type inet:host;
         description
           "The IP address or DNS domain name of the device.";
       }
       leaf management-ipv6-address {
         type inet:host;
         description

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           "The IP address or DNS domain name of the device.";
       }
       leaf mac-address {
         type yang:mac-address;
         config false;
         description
           "The MAC address of the device.";
       }
       leaf mud-url {
         type inet:uri;
         config false;
         description
           "This is the MUD URL associated with the MUD device found
            in a MUD file.";
       }
       leaf transparency-info {
         type inet:uri;
         config false;
         description
           "Link to software bill of material,
            see draft-ietf-opsawg-sbom-access";
       }
       leaf site {
         type string;
         description
           "The site of the node.";
       }
       uses component-info;
       uses components;
       uses geo:geo-location;
     }

     grouping inventory-termination-point-attributes {
       description
         "Augment used to define attach the termination point
          attributes.";
       leaf tp-name {
         type string;
         config false;
         description
           "The name of the interface.";
       }
       leaf tp-description {
         type string;
         config false;
         description
           "A textual description of the interface.";
       }

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       leaf tp-type {
         type string;
         config false;
         description
           "The type of the interface.";
       }
       leaf oper-state {
         type oper-state;
         config false;
         description
           "The operational state for this interface.";
       }
     }

     grouping inventory-link-attributes {
       description
         "Augment used to define attach the termination point
          attributes.";
       leaf link-name {
         type string;
         config false;
         description
           "The name of the link.";
       }
       leaf link-description {
         type string;
         config false;
         description
           "A textual description of the interface.";
       }
       leaf link-type {
         type string;
         config false;
         description
           "The type of the interface.";
       }
       leaf oper-state {
         type oper-state;
         config false;
         description
           "The operational state for this link.";
       }
     }

     /* Main blocks */

     augment "/nw:networks/nw:network/nw:network-types" {
       description

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         "Introduces new network type for network inventory.";
       uses inventory-network-type;
     }

     augment "/nw:networks/nw:network/nw:node" {
       when '/nw:networks/nw:network/nw:network-types/
        nw-inv:network-inventory' {
         description
           "Augmentation parameters apply only for network inventory.";
       }
       description
         "Configuration parameters for inventory at the node
          level.";
       uses inventory-node-attributes;
     }

     augment "/nw:networks/nw:network/nt:link" {
       when '/nw:networks/nw:network/nw:network-types/
        nw-inv:network-inventory' {
         description
           "Augmentation parameters apply only for network
            inventory.";
       }
       description
         "Augments inventory topology link information.";
       uses inventory-link-attributes;
     }

     augment
       "/nw:networks/nw:network/nw:node/nt:termination-point" {
         when '/nw:networks/nw:network/nw:network-types/
         nw-inv:network-inventory' {
           description
             "Augmentation parameters apply only for network
              inventory.";
         }
         description
           "Augments inventory termination point information.";
         uses inventory-termination-point-attributes;
     }
   }
   <CODE ENDS>

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6.  Security Considerations

   The YANG module specified in this document defines a data schema
   designed to be accessed through network management protocols such as
   NETCONF [RFC6241] or RESTCONF [RFC8040].  The lowest NETCONF layer is
   the secure transport layer, and the required secure transport is
   Secure Shell (SSH) [RFC6242].  The lowest RESTCONF layer is HTTPS,
   and the required secure transport is TLS [RFC8446].

   The Network Configuration Access Control Model (NACM) [RFC8341]
   provides a means of restricting access to specific NETCONF or
   RESTCONF users to a preconfigured subset of all available NETCONF or
   RESTCONF protocol operations and contents.  Thus, NACM SHOULD be used
   to restrict the NSF registration from unauthorized users.

   There are a number of data nodes defined in this YANG module that are
   writable, creatable, and deletable (i.e., config true, which is the
   default).  These data nodes may be considered sensitive or vulnerable
   in some network environments.  Write operations to these data nodes
   could have a negative effect on network and security operations.

   Some of the readable data nodes in this YANG module may be considered
   sensitive or vulnerable in some network environments.  It is thus
   important to control read access (e.g., via get, get-config, or
   notification) to these data nodes.  These are the subtrees and data
   nodes and their sensitivity/vulnerability:

   <<<to be completed>>>

7.  Privacy Considerations

   The model includes sensitive PII data.  More to be discussed:

   *  Data related to BYOD devices

8.  IANA Considerations

   This document registers a URI in the "IETF XML Registry" [RFC3688].
   Following the format in [RFC3688], the following registration has
   been made.

        URI: urn:ietf:params:xml:ns:yang:ietf-network-inventory

        Registrant Contact: The IESG.

        XML: N/A, the requested URI is an XML namespace.

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   This document registers a YANG module in the "YANG Module Names"
   registry[RFC7950] .

        name:         ietf-network-inventory
        namespace:    urn:ietf:params:xml:ns:yang:ietf-network-inventory
        prefix:       nw-inv
        maintained by IANA: N
        reference:    RFC xxxx

9.  Acknowledgements

   TBD

10.  References

10.1.  Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119,
              DOI 10.17487/RFC2119, March 1997,
              <https://www.rfc-editor.org/info/rfc2119>.

   [RFC3688]  Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688,
              DOI 10.17487/RFC3688, January 2004,
              <https://www.rfc-editor.org/info/rfc3688>.

   [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>.

   [RFC6242]  Wasserman, M., "Using the NETCONF Protocol over Secure
              Shell (SSH)", RFC 6242, DOI 10.17487/RFC6242, June 2011,
              <https://www.rfc-editor.org/info/rfc6242>.

   [RFC6991]  Schoenwaelder, J., Ed., "Common YANG Data Types",
              RFC 6991, DOI 10.17487/RFC6991, July 2013,
              <https://www.rfc-editor.org/info/rfc6991>.

   [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>.

   [RFC8040]  Bierman, A., Bjorklund, M., and K. Watsen, "RESTCONF
              Protocol", RFC 8040, DOI 10.17487/RFC8040, January 2017,
              <https://www.rfc-editor.org/info/rfc8040>.

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   [RFC8174]  Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
              2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
              May 2017, <https://www.rfc-editor.org/info/rfc8174>.

   [RFC8341]  Bierman, A. and M. Bjorklund, "Network Configuration
              Access Control Model", STD 91, RFC 8341,
              DOI 10.17487/RFC8341, March 2018,
              <https://www.rfc-editor.org/info/rfc8341>.

   [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>.

   [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>.

   [RFC8446]  Rescorla, E., "The Transport Layer Security (TLS) Protocol
              Version 1.3", RFC 8446, DOI 10.17487/RFC8446, August 2018,
              <https://www.rfc-editor.org/info/rfc8446>.

   [RFC9179]  Hopps, C., "A YANG Grouping for Geographic Locations",
              RFC 9179, DOI 10.17487/RFC9179, February 2022,
              <https://www.rfc-editor.org/info/rfc9179>.

10.2.  Informative References

   [I-D.ietf-opsawg-sap]
              Boucadair, M., de Dios, O. G., Barguil, S., Wu, Q., and V.
              Lopez, "A YANG Network Model for Service Attachment Points
              (SAPs)", Work in Progress, Internet-Draft, draft-ietf-
              opsawg-sap-15, 18 January 2023,
              <https://www.ietf.org/archive/id/draft-ietf-opsawg-sap-
              15.txt>.

   [I-D.irtf-nmrg-network-digital-twin-arch]
              Zhou, C., Yang, H., Duan, X., Lopez, D., Pastor, A., Wu,
              Q., Boucadair, M., and C. Jacquenet, "Digital Twin
              Network: Concepts and Reference Architecture", Work in
              Progress, Internet-Draft, draft-irtf-nmrg-network-digital-
              twin-arch-02, 24 October 2022,
              <https://www.ietf.org/archive/id/draft-irtf-nmrg-network-
              digital-twin-arch-02.txt>.

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   [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>.

Authors' Addresses

   Bo Wu
   Huawei
   101 Software Avenue, Yuhua District
   Nanjing
   Jiangsu, 210012
   China
   Email: lana.wubo@huawei.com

   Cheng Zhou
   China Mobile
   Beijing
   100053
   China
   Email: zhouchengyjy@chinamobile.com

   Qin Wu
   Huawei
   101 Software Avenue, Yuhua District
   Nanjing
   Jiangsu, 210012
   China
   Email: bill.wu@huawei.com

   Mohamed Boucadair
   Orange
   Rennes 35000
   France
   Email: mohamed.boucadair@orange.com

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