A Network Inventory Topology
ModelHuawei101 Software Avenue, Yuhua DistrictNanjingJiangsu210012Chinalana.wubo@huawei.comChina MobileBeijing100053Chinazhouchengyjy@chinamobile.comHuawei101 Software Avenue, Yuhua DistrictNanjingJiangsu210012Chinabill.wu@huawei.comOrangeRennes 35000Francemohamed.boucadair@orange.com
OPS Area
IVYNetwork Inventory TopologyThis document defines a YANG model for network inventory topology to
correlate the network inventory data with the general topology model to
form a base underlay network, which can facilitate the mapping and
correlation of the layer (e.g. Layer 2, Layer3) topology information
above to the inventory data of the underlay network for agile service
provisioning and network maintenance analysis. defines base
Network Inventory (NI) model to aggregate the inventory data of the
Network Elements (NEs) on the network, which includes NEs and their
hardware components, firmware components, and software components.
Examples of inventory hardware components could be rack, shelf, slot,
board and physical port. Examples of inventory software components could
be platform operating system (OS), software-patch, bios, and
boot-loader.This document extends the RFC 8345 network topology model for network
inventory mapping, which facilitates the correlation with existing
network and topology models, such as SAP , L2
topology , and L3 topology , to support agile service provisioning and network
maintenance.In addition, the network inventory topology can also provide anchor
points to mount specific device configuration and state information,
e.g. QoS policies, ACL policies, to support configuration verification
of cross-domain policies.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
when, and only when,
they appear in all capitals, as shown here.The inventory topology model can be used as a base to correlate
underlay information, such as physical port components. The figure
belows gives an example of the usage.During service provisioning, to check available physical port
resources, the Service Attachment Points (SAPs) information can be
associated with the underlay inventory information and interface
information associated with the inventory topology, e.g.
"parent-termination-point" of SAP Model can be associated with the
"port-component-ref" and "interface-name" of the inventory topology
model, which can be used to check the availability and capacity of
physical ports. 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.The management system can use digital twin technology to build
visual multi-layer topology 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 topology 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.The following tree diagram provides an
overview of the data model for "ietf-network-inventory-topology"
module.The module augments the original "ietf-network- topology" modules as
follows: A new network topology type: "network-inventory-mapping". The
corresponding container augments the network-types of the
"ietf-network" module.Inventory mapping attributes for nodes, links, and termination
points: The corresponding containers augments the topology module
with the references to the base network inventory, references to
interface management, and system mount points .Being an independent underlaying topology, the inventory
topology model associates inventory data with abstract topologies. It
can be used as the "supporting-networks" of SAP, Layer 2, or Layer 3
topologies.The "ietf-network-inventory-topology" module uses types defined in
. file="ietf-network-inventory-topology@2024-04-29.yang"
module ietf-network-inventory-topology {
yang-version 1.1;
namespace
"urn:ietf:params:xml:ns:yang:ietf-network-inventory-topology";
prefix nwit;
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-network-inventory {
prefix nwi;
reference
"RFC AAAA: A YANG Data Model for Network Inventory";
}
organization
"IETF Network Inventory YANG (ivy) Working Group";
contact
"WG Web:
WG List:
Editor: Bo Wu
Editor: Cheng Zhou
Editor: Qin Wu
Editor: Mohamed Boucadair
";
description
"This YANG module defines XXX.
Copyright (c) 2024 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 2024-04-29 {
description
"Initial revision.";
reference
"RFC XXXX: A YANG Data Model for Network Inventory Mapping
Topology";
}
/* Identities */
/* Typedef */
typedef ne-ref {
type leafref {
path "/nwi:network-inventory/nwi:network-elements"
+ "/nwi:network-element/nwi:ne-id";
}
description
"This type is used by data models that need to reference
Network Element.";
}
/* Groupings */
grouping inventory-mapping-network-type {
description
"Indicates the topology type to be Network Inventory mapping.";
container network-inventory-mapping {
presence "Indicates Network Inventory mapping topology.";
description
"The presence of the container node indicates
Network Inventory mapping.";
}
}
grouping system-mount-point {
description
"Indicates system configuration or state mount point.";
container system-mount-point {
description
"Container for system configuration or state mount point.";
}
}
grouping node-inventory-attributes {
description
"Network Inventory mapping node scope attributes";
container inventory-mapping-attributes {
description
"The container node attributes of Network Inventory mapping.";
leaf node-name {
type string;
description
"The name of the node.";
}
leaf ne-ref {
type ne-ref;
config false;
description
"The reference of the Network Element (NE) from which this
node is abstracted.";
}
uses system-mount-point;
}
}
grouping termination-point-inventory-attributes {
description
"Network Inventory mapping termination point (TP) scope
attributes";
container inventory-mapping-attributes {
description
"The container TP attributes of Network Inventory mapping.";
leaf tp-name {
type string;
config false;
description
"The name of the TP.";
}
leaf port-component-ref {
type leafref {
path
"/nwi:network-inventory/nwi:network-elements"
+ "/nwi:network-element[nwi:ne-id=current()/../../../"
+ "inventory-mapping-attributes/ne-ref]/nwi:components"
+ "/nwi:component/nwi:component-id";
}
config false;
description
"The reference of the port component from which this
termination point is abstracted.";
}
leaf-list interface-name {
type string;
description
"Name of the interface. The name can (but does not
have to) correspond to an interface reference of a
containing node's interface, i.e., the path name of a
corresponding interface data node on the containing
node is reminiscent of data type interface-ref defined
in RFC 8343. It should be noted that data type
interface-ref of RFC 8343 cannot be used directly,
as this data type is used to reference an interface
in a datastore of a single node in the network, not
to uniquely reference interfaces across a network.";
}
uses system-mount-point;
}
}
grouping link-inventory-attributes {
description
"Network Inventory mapping link scope attributes";
container inventory-mapping-attributes {
description
"The container link attributes of network inventory mapping.";
leaf link-name {
type string;
description
"The name of the link.";
}
leaf cable-name {
type string;
config false;
description
"The reference of the cable inventory from which
this link is abstracted
Note: this will be changed based on the future inventoy
cable model.";
}
leaf link-type {
type string;
config false;
description
"The type of the link.
Note: this will be changed based on the future inventoy
cable model.";
}
}
}
/* Main blocks */
augment "/nw:networks/nw:network/nw:network-types" {
description
"Introduces new network type for network inventory mapping.";
uses inventory-mapping-network-type;
}
augment "/nw:networks/nw:network/nw:node" {
when '/nw:networks/nw:network/nw:network-types/
nwit:network-inventory-mapping' {
description
"Augmentation parameters apply only for network inventory
mapping.";
}
description
"Configuration parameters for inventory at the node
level.";
uses node-inventory-attributes;
}
augment "/nw:networks/nw:network/nt:link" {
when '/nw:networks/nw:network/nw:network-types/
nwit:network-inventory-mapping' {
description
"Augmentation parameters apply only for network
inventory.";
}
description
"Augments inventory topology link information.";
uses link-inventory-attributes;
}
augment
"/nw:networks/nw:network/nw:node/nt:termination-point" {
when '/nw:networks/nw:network/nw:network-types/
nwit:network-inventory-mapping' {
description
"Augmentation parameters apply only for network
inventory.";
}
description
"Augments inventory termination point information.";
uses termination-point-inventory-attributes;
}
}
]]>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>>>The model includes sensitive PII data. More to be discussed:Data related to BYOD devicesThis document registers a URI in the "IETF XML Registry" . Following the format in ,
the following registration has been made.This document registers a YANG module in the "YANG Module Names"
registry .The authors wish to thank Italo Busi, Olga Havel, Aihua Guo, Oscar
Gonzalez de Dios, and many others for their helpful comments and
suggestions.The following authors contributed significantly to this document:The "ietf-network-inventory-topology" provides the topology mapping
with the network inventory by using references. This design does not
impact the existing topology models.This appendix also introduces a YANG module that defines a simple
topology model for network inventory reference. This module is intended
to serve as an example that illustrates how the general topology model
can be refined with inventory references across multiple levels of
topology, e.g. TE topology, Layer 2 topology, Layer 3 topology, service
attachment points (SAPs) topology. below shows the tree diagram of the
YANG data model defined in module "example-topo-inventory-ref"The Topology Inventory Reference YANG module is specified below. As
mentioned, the module is intended as an example for how the topology
model can be extended to cover inventory references, but it is only
for discusson. Accordingly, the module is not delimited with <CODE
BEGINS> and <CODE ENDS> tags.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 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. 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.With the inventory data collected from the underlying network, the
network orchestration system can centrally manage security and network
policies related to network endpoints.