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IETF RFC 8348
A YANG Data Model for Hardware Management
Last modified on Tuesday, March 27th, 2018
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Internet Engineering Task Force (IETF) A. Bierman
Request for Comments: 8348 YumaWorks
Category: Standards Track M. Bjorklund
ISSN: 2070-1721 Tail-f Systems
J. Dong
Huawei Technologies
D. Romascanu
March 2018
A YANG Data Model for Hardware Management
 Abstract
This document defines a YANG data model for the management of
hardware on a single server.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in Section 2 of RFC 7841.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
https://www.rfc-editor.org/info/RFC 8348.
Copyright Notice
Copyright (c) 2018 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.
Bierman, et al. Standards Track PAGE 1 
RFC 8348 YANG Hardware Management March 2018
Table of Contents
1. Introduction ....................................................3
1.1. Terminology ................................................3
1.2. Tree Diagrams ..............................................3
2. Objectives ......................................................4
3. Hardware Data Model .............................................4
3.1. The Components Lists .......................................5
4. Relationship to ENTITY-MIB ......................................6
5. Relationship to ENTITY-SENSOR-MIB ...............................8
6. Relationship to ENTITY-STATE-MIB ................................8
7. Hardware YANG Modules ...........................................9
7.1. "ietf-hardware" Module .....................................9
7.2. "iana-hardware" Module ....................................34
8. IANA Considerations ............................................38
8.1. URI Registrations .........................................38
8.2. YANG Module Registrations .................................39
9. Security Considerations ........................................39
10. References ....................................................40
10.1. Normative References .....................................40
10.2. Informative References ...................................41
Appendix A. Hardware State Data Model ............................42
A.1. Hardware State YANG Module ................................43
Acknowledgments ...................................................60
Authors' Addresses ................................................60
Bierman, et al. Standards Track PAGE 2
RFC 8348 YANG Hardware Management March 2018
1. Introduction
This document defines a YANG data model [RFC 7950] for the management
of hardware on a single server.
The data model includes configuration and system state (status
information and counters for the collection of statistics).
The data model in this document is designed to be compliant with the
Network Management Datastore Architecture (NMDA) [RFC 8342]. For
implementations that do not yet support NMDA, a temporary module with
system state data only is defined in Appendix A.
1.1. Terminology
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.
The following terms are defined in [RFC 8342] and are not redefined
here:
o client
o server
o configuration
o system state
o operational state
o intended configuration
1.2. Tree Diagrams
Tree diagrams used in this document follow the notation defined in
[RFC 8340].
Bierman, et al. Standards Track PAGE 3
RFC 8348 YANG Hardware Management March 2018
2. Objectives
This section describes some of the design objectives for the hardware
data model.
o The hardware data model needs to support many common properties
used to identify hardware components.
o Important information and states about hardware components need to
be collected from devices that support the hardware data model.
o The hardware data model should be suitable for new implementations
to use as is.
o The hardware data model defined in this document can be
implemented on a system that also implements ENTITY-MIB; thus, the
mapping between the hardware data model and ENTITY-MIB should be
clear.
o The data model should support pre-provisioning of hardware
components.
3. Hardware Data Model
This document defines the YANG module "ietf-hardware", which has the
following structure:
module: ietf-hardware
+--rw hardware
+--ro last-change? yang:date-and-time
+--rw component* [name]
+--rw name string
+--rw class identityref
+--ro physical-index? int32 {entity-mib}?
+--ro description? string
+--rw parent? -> ../../component/name
+--rw parent-rel-pos? int32
+--ro contains-child* -> ../../component/name
+--ro hardware-rev? string
+--ro firmware-rev? string
+--ro software-rev? string
+--ro serial-num? string
+--ro mfg-name? string
+--ro model-name? string
+--rw alias? string
+--rw asset-id? string
+--ro is-fru? boolean
+--ro mfg-date? yang:date-and-time
Bierman, et al. Standards Track PAGE 4
RFC 8348 YANG Hardware Management March 2018
+--rw uri* inet:uri
+--ro uuid? yang:uuid
+--rw state {hardware-state}?
| +--ro state-last-changed? yang:date-and-time
| +--rw admin-state? admin-state
| +--ro oper-state? oper-state
| +--ro usage-state? usage-state
| +--ro alarm-state? alarm-state
| +--ro standby-state? standby-state
+--ro sensor-data {hardware-sensor}?
+--ro value? sensor-value
+--ro value-type? sensor-value-type
+--ro value-scale? sensor-value-scale
+--ro value-precision? sensor-value-precision
+--ro oper-status? sensor-status
+--ro units-display? string
+--ro value-timestamp? yang:date-and-time
+--ro value-update-rate? uint32
notifications:
+---n hardware-state-change
+---n hardware-state-oper-enabled {hardware-state}?
| +--ro name? -> /hardware/component/name
| +--ro admin-state? -> /hardware/component/state/admin-state
| +--ro alarm-state? -> /hardware/component/state/alarm-state
+---n hardware-state-oper-disabled {hardware-state}?
+--ro name? -> /hardware/component/name
+--ro admin-state? -> /hardware/component/state/admin-state
+--ro alarm-state? -> /hardware/component/state/alarm-state
3.1. The Components Lists
The data model for hardware presented in this document uses a flat
list of components. Each component in the list is identified by its
name. Furthermore, each component has a mandatory "class" leaf.
The "iana-hardware" module defines YANG identities for the hardware
types in the IANA-maintained "IANA-ENTITY-MIB" registry.
The "class" leaf is a YANG identity that describes the type of the
hardware. Vendors are encouraged to either directly use one of the
common IANA-defined identities or derive a more specific identity
from one of them.
Bierman, et al. Standards Track PAGE 5
RFC 8348 YANG Hardware Management March 2018
4. Relationship to ENTITY-MIB
If the device implements the ENTITY-MIB [RFC 6933], each entry in the
"/hardware/component" list in the operational state is mapped to one
EntPhysicalEntry. Objects that are writable in the MIB are mapped to
"config true" nodes in the "/hardware/component" list, except
entPhysicalSerialNum, which is writable in the MIB but "config false"
in the YANG module.
The "physical-index" leaf MUST contain the value of the corresponding
entPhysicalEntry's entPhysicalIndex.
The "class" leaf is mapped to both entPhysicalClass and
entPhysicalVendorType. If the value of the "class" leaf is an
identity that either is derived from or is one of the identities in
the "iana-hardware" module, then entPhysicalClass contains the
corresponding IANAPhysicalClass enumeration value. Otherwise,
entPhysicalClass contains the IANAPhysicalClass value "other(1)".
Vendors are encouraged to define an identity (derived from an
identity in "iana-hardware" if possible) for each enterprise-specific
registration identifier used for entPhysicalVendorType and use that
identity for the "class" leaf.
The following table lists the YANG data nodes with corresponding
objects in the ENTITY-MIB.
Bierman, et al. Standards Track PAGE 6
RFC 8348 YANG Hardware Management March 2018
+--------------------------------+----------------------------------+
| YANG data node in | ENTITY-MIB object |
| /hardware/component | |
+--------------------------------+----------------------------------+
| name | entPhysicalName |
| class | entPhysicalClass |
| | entPhysicalVendorType |
| physical-index | entPhysicalIndex |
| description | entPhysicalDescr |
| parent | entPhysicalContainedIn |
| parent-rel-pos | entPhysicalParentRelPos |
| contains-child | entPhysicalChildIndex |
| hardware-rev | entPhysicalHardwareRev |
| firmware-rev | entPhysicalFirmwareRev |
| software-rev | entPhysicalSoftwareRev |
| serial-num | entPhysicalSerialNum |
| mfg-name | entPhysicalMfgName |
| model-name | entPhysicalModelName |
| alias | entPhysicalAlias |
| asset-id | entPhysicalAssetID |
| is-fru | entPhysicalIsFRU |
| mfg-date | entPhysicalMfgDate |
| uri | entPhysicalUris |
| uuid | entPhysicalUUID |
+--------------------------------+----------------------------------+
YANG Data Nodes and Related ENTITY-MIB Objects
Bierman, et al. Standards Track PAGE 7
RFC 8348 YANG Hardware Management March 2018
5. Relationship to ENTITY-SENSOR-MIB
If the device implements the ENTITY-SENSOR-MIB [RFC 3433], each entry
in the "/hardware/component" list where the container "sensor-data"
exists is mapped to one EntPhySensorEntry.
The following table lists the YANG data nodes with corresponding
objects in the ENTITY-SENSOR-MIB.
+-------------------------------------+-----------------------------+
| YANG data node in | ENTITY-SENSOR-MIB object |
| /hardware/component/sensor-data | |
+-------------------------------------+-----------------------------+
| value | entPhySensorValue |
| value-type | entPhySensorType |
| value-scale | entPhySensorScale |
| value-precision | entPhySensorPrecision |
| oper-status | entPhySensorOperStatus |
| units-display | entPhySensorUnitsDisplay |
| value-timestamp | entPhySensorValueTimeStamp |
| value-update-rate | entPhySensorValueUpdateRate |
+-------------------------------------+-----------------------------+
YANG Data Nodes and Related ENTITY-SENSOR-MIB Objects
6. Relationship to ENTITY-STATE-MIB
If the device implements the ENTITY-STATE-MIB [RFC 4268], each entry
in the "/hardware/component" list where the container "state" exists
is mapped to one EntStateEntry.
The following table lists the YANG data nodes with corresponding
objects in the ENTITY-STATE-MIB.
+------------------------------------------+------------------------+
| YANG data node in | ENTITY-STATE-MIB |
| /hardware/component/state | object |
+------------------------------------------+------------------------+
| state-last-changed | entStateLastChanged |
| admin-state | entStateAdmin |
| oper-state | entStateOper |
| usage-state | entStateUsage |
| alarm-state | entStateAlarm |
| standby-state | entStateStandby |
+------------------------------------------+------------------------+
YANG Data Nodes and Related ENTITY-SENSOR-MIB Objects
Bierman, et al. Standards Track PAGE 8
RFC 8348 YANG Hardware Management March 2018
7. Hardware YANG Modules
7.1. "ietf-hardware" Module
This YANG module imports typedefs from [RFC 6991].
<CODE BEGINS> file "ietf-hardware@2018-03-13.yang"
module ietf-hardware {
yang-version 1.1;
namespace "urn:ietf:params:xml:ns:yang:ietf-hardware";
prefix hw;
import ietf-inet-types {
prefix inet;
}
import ietf-yang-types {
prefix yang;
}
import iana-hardware {
prefix ianahw;
}
organization
"IETF NETMOD (Network Modeling) Working Group";
contact
"WG Web: <https://datatracker.ietf.org/wg/netmod/>
WG List: <mailto:netmod@ietf.org>
Editor: Andy Bierman
<mailto:andy@yumaworks.com>
Editor: Martin Bjorklund
<mailto:mbj@tail-f.com>
Editor: Jie Dong
<mailto:jie.dong@huawei.com>
Editor: Dan Romascanu
<mailto:dromasca@gmail.com>";
description
"This module contains a collection of YANG definitions for
managing hardware.
This data model is designed for the Network Management Datastore
Architecture (NMDA) defined in RFC 8342.
Bierman, et al. Standards Track PAGE 9
RFC 8348 YANG Hardware Management March 2018
Copyright (c) 2018 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).
This version of this YANG module is part of RFC 8348; see
the RFC itself for full legal notices.";
revision 2018-03-13 {
description
"Initial revision.";
reference
"RFC 8348: A YANG Data Model for Hardware Management";
}
/*
* Features
*/
feature entity-mib {
description
"This feature indicates that the device implements
the ENTITY-MIB.";
reference
"RFC 6933: Entity MIB (Version 4)";
}
feature hardware-state {
description
"Indicates that ENTITY-STATE-MIB objects are supported";
reference
"RFC 4268: Entity State MIB";
}
feature hardware-sensor {
description
"Indicates that ENTITY-SENSOR-MIB objects are supported";
reference
"RFC 3433: Entity Sensor Management Information Base";
}
/*
* Typedefs
Bierman, et al. Standards Track PAGE 10
RFC 8348 YANG Hardware Management March 2018
*/
typedef admin-state {
type enumeration {
enum unknown {
value 1;
description
"The resource is unable to report administrative state.";
}
enum locked {
value 2;
description
"The resource is administratively prohibited from use.";
}
enum shutting-down {
value 3;
description
"The resource usage is administratively limited to current
instances of use.";
}
enum unlocked {
value 4;
description
"The resource is not administratively prohibited from
use.";
}
}
description
"Represents the various possible administrative states.";
reference
"RFC 4268: Entity State MIB - EntityAdminState";
}
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;
Bierman, et al. Standards Track PAGE 11
RFC 8348 YANG Hardware Management March 2018
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";
}
typedef usage-state {
type enumeration {
enum unknown {
value 1;
description
"The resource is unable to report usage state.";
}
enum idle {
value 2;
description
"The resource is servicing no users.";
}
enum active {
value 3;
description
"The resource is currently in use, and it has sufficient
spare capacity to provide for additional users.";
}
enum busy {
value 4;
description
"The resource is currently in use, but it currently has no
spare capacity to provide for additional users.";
}
}
description
"Represents the possible values of usage states.";
reference
"RFC 4268: Entity State MIB - EntityUsageState";
}
typedef alarm-state {
Bierman, et al. Standards Track PAGE 12
RFC 8348 YANG Hardware Management March 2018
type bits {
bit unknown {
position 0;
description
"The resource is unable to report alarm state.";
}
bit under-repair {
position 1;
description
"The resource is currently being repaired, which, depending
on the implementation, may make the other values in this
bit string not meaningful.";
}
bit critical {
position 2;
description
"One or more critical alarms are active against the
resource.";
}
bit major {
position 3;
description
"One or more major alarms are active against the
resource.";
}
bit minor {
position 4;
description
"One or more minor alarms are active against the
resource.";
}
bit warning {
position 5;
description
"One or more warning alarms are active against the
resource.";
}
bit indeterminate {
position 6;
description
"One or more alarms of whose perceived severity cannot be
determined are active against this resource.";
}
}
description
"Represents the possible values of alarm states. An alarm is a
persistent indication of an error or warning condition.
Bierman, et al. Standards Track PAGE 13
RFC 8348 YANG Hardware Management March 2018
When no bits of this attribute are set, then no active alarms
are known against this component and it is not under repair.";
reference
"RFC 4268: Entity State MIB - EntityAlarmStatus";
}
typedef standby-state {
type enumeration {
enum unknown {
value 1;
description
"The resource is unable to report standby state.";
}
enum hot-standby {
value 2;
description
"The resource is not providing service, but it will be
immediately able to take over the role of the resource to
be backed up, without the need for initialization
activity, and will contain the same information as the
resource to be backed up.";
}
enum cold-standby {
value 3;
description
"The resource is to back up another resource, but it will
not be immediately able to take over the role of a
resource to be backed up and will require some
initialization activity.";
}
enum providing-service {
value 4;
description
"The resource is providing service.";
}
}
description
"Represents the possible values of standby states.";
reference
"RFC 4268: Entity State MIB - EntityStandbyStatus";
}
typedef sensor-value-type {
type enumeration {
enum other {
value 1;
description
"A measure other than those listed below.";
Bierman, et al. Standards Track PAGE 14
RFC 8348 YANG Hardware Management March 2018
}
enum unknown {
value 2;
description
"An unknown measurement or arbitrary, relative numbers";
}
enum volts-AC {
value 3;
description
"A measure of electric potential (alternating current).";
}
enum volts-DC {
value 4;
description
"A measure of electric potential (direct current).";
}
enum amperes {
value 5;
description
"A measure of electric current.";
}
enum watts {
value 6;
description
"A measure of power.";
}
enum hertz {
value 7;
description
"A measure of frequency.";
}
enum celsius {
value 8;
description
"A measure of temperature.";
}
enum percent-RH {
value 9;
description
"A measure of percent relative humidity.";
}
enum rpm {
value 10;
description
"A measure of shaft revolutions per minute.";
}
enum cmm {
value 11;
Bierman, et al. Standards Track PAGE 15
RFC 8348 YANG Hardware Management March 2018
description
"A measure of cubic meters per minute (airflow).";
}
enum truth-value {
value 12;
description
"Value is one of 1 (true) or 2 (false)";
}
}
description
"A node using this data type represents the sensor measurement
data type associated with a physical sensor value. The actual
data units are determined by examining a node of this type
together with the associated sensor-value-scale node.
A node of this type SHOULD be defined together with nodes of
type sensor-value-scale and type sensor-value-precision.
These three types are used to identify the semantics of a node
of type sensor-value.";
reference
"RFC 3433: Entity Sensor Management Information Base -
EntitySensorDataType";
}
typedef sensor-value-scale {
type enumeration {
enum yocto {
value 1;
description
"Data scaling factor of 10^-24.";
}
enum zepto {
value 2;
description
"Data scaling factor of 10^-21.";
}
enum atto {
value 3;
description
"Data scaling factor of 10^-18.";
}
enum femto {
value 4;
description
"Data scaling factor of 10^-15.";
}
enum pico {
value 5;
Bierman, et al. Standards Track PAGE 16
RFC 8348 YANG Hardware Management March 2018
description
"Data scaling factor of 10^-12.";
}
enum nano {
value 6;
description
"Data scaling factor of 10^-9.";
}
enum micro {
value 7;
description
"Data scaling factor of 10^-6.";
}
enum milli {
value 8;
description
"Data scaling factor of 10^-3.";
}
enum units {
value 9;
description
"Data scaling factor of 10^0.";
}
enum kilo {
value 10;
description
"Data scaling factor of 10^3.";
}
enum mega {
value 11;
description
"Data scaling factor of 10^6.";
}
enum giga {
value 12;
description
"Data scaling factor of 10^9.";
}
enum tera {
value 13;
description
"Data scaling factor of 10^12.";
}
enum peta {
value 14;
description
"Data scaling factor of 10^15.";
}
Bierman, et al. Standards Track PAGE 17
RFC 8348 YANG Hardware Management March 2018
enum exa {
value 15;
description
"Data scaling factor of 10^18.";
}
enum zetta {
value 16;
description
"Data scaling factor of 10^21.";
}
enum yotta {
value 17;
description
"Data scaling factor of 10^24.";
}
}
description
"A node using this data type represents a data scaling factor,
represented with an International System of Units (SI) prefix.
The actual data units are determined by examining a node of
this type together with the associated sensor-value-type.
A node of this type SHOULD be defined together with nodes of
type sensor-value-type and type sensor-value-precision.
Together, associated nodes of these three types are used to
identify the semantics of a node of type sensor-value.";
reference
"RFC 3433: Entity Sensor Management Information Base -
EntitySensorDataScale";
}
typedef sensor-value-precision {
type int8 {
range "-8 .. 9";
}
description
"A node using this data type represents a sensor value
precision range.
A node of this type SHOULD be defined together with nodes of
type sensor-value-type and type sensor-value-scale. Together,
associated nodes of these three types are used to identify the
semantics of a node of type sensor-value.
If a node of this type contains a value in the range 1 to 9,
it represents the number of decimal places in the fractional
part of an associated sensor-value fixed-point number.
Bierman, et al. Standards Track PAGE 18
RFC 8348 YANG Hardware Management March 2018
If a node of this type contains a value in the range -8 to -1,
it represents the number of accurate digits in the associated
sensor-value fixed-point number.
The value zero indicates the associated sensor-value node is
not a fixed-point number.
Server implementers must choose a value for the associated
sensor-value-precision node so that the precision and accuracy
of the associated sensor-value node is correctly indicated.
For example, a component representing a temperature sensor
that can measure 0 to 100 degrees C in 0.1 degree
increments, +/- 0.05 degrees, would have a
sensor-value-precision value of '1', a sensor-value-scale
value of 'units', and a sensor-value ranging from '0' to
'1000'. The sensor-value would be interpreted as
'degrees C * 10'.";
reference
"RFC 3433: Entity Sensor Management Information Base -
EntitySensorPrecision";
}
typedef sensor-value {
type int32 {
range "-1000000000 .. 1000000000";
}
description
"A node using this data type represents a sensor value.
A node of this type SHOULD be defined together with nodes of
type sensor-value-type, type sensor-value-scale, and
type sensor-value-precision. Together, associated nodes of
those three types are used to identify the semantics of a node
of this data type.
The semantics of a node using this data type are determined by
the value of the associated sensor-value-type node.
If the associated sensor-value-type node is equal to 'voltsAC',
'voltsDC', 'amperes', 'watts', 'hertz', 'celsius', or 'cmm',
then a node of this type MUST contain a fixed-point number
ranging from -999,999,999 to +999,999,999. The value
-1000000000 indicates an underflow error. The value
+1000000000 indicates an overflow error. The
sensor-value-precision indicates how many fractional digits
are represented in the associated sensor-value node.
Bierman, et al. Standards Track PAGE 19
RFC 8348 YANG Hardware Management March 2018
If the associated sensor-value-type node is equal to
'percentRH', then a node of this type MUST contain a number
ranging from 0 to 100.
If the associated sensor-value-type node is equal to 'rpm',
then a node of this type MUST contain a number ranging from
-999,999,999 to +999,999,999.
If the associated sensor-value-type node is equal to
'truth-value', then a node of this type MUST contain either the
value 1 (true) or the value 2 (false).
If the associated sensor-value-type node is equal to 'other' or
'unknown', then a node of this type MUST contain a number
ranging from -1000000000 to 1000000000.";
reference
"RFC 3433: Entity Sensor Management Information Base -
EntitySensorValue";
}
typedef sensor-status {
type enumeration {
enum ok {
value 1;
description
"Indicates that the server can obtain the sensor value.";
}
enum unavailable {
value 2;
description
"Indicates that the server presently cannot obtain the
sensor value.";
}
enum nonoperational {
value 3;
description
"Indicates that the server believes the sensor is broken.
The sensor could have a hard failure (disconnected wire)
or a soft failure such as out-of-range, jittery, or wildly
fluctuating readings.";
}
}
description
"A node using this data type represents the operational status
of a physical sensor.";
reference
"RFC 3433: Entity Sensor Management Information Base -
EntitySensorStatus";
Bierman, et al. Standards Track PAGE 20
RFC 8348 YANG Hardware Management March 2018
}
/*
* Data nodes
*/
container hardware {
description
"Data nodes representing components.
If the server supports configuration of hardware components,
then this data model is instantiated in the configuration
datastores supported by the server. The leaf-list 'datastore'
for the module 'ietf-hardware' in the YANG library provides
this information.";
leaf last-change {
type yang:date-and-time;
config false;
description
"The time the '/hardware/component' list changed in the
operational state.";
}
list component {
key name;
description
"List of components.
When the server detects a new hardware component, it
initializes a list entry in the operational state.
If the server does not support configuration of hardware
components, list entries in the operational state are
initialized with values for all nodes as detected by the
implementation.
Otherwise, this procedure is followed:
1. If there is an entry in the '/hardware/component' list
in the intended configuration with values for the nodes
'class', 'parent', and 'parent-rel-pos' that are equal
to the detected values, then the list entry in the
operational state is initialized with the configured
values, including the 'name'.
Bierman, et al. Standards Track PAGE 21
RFC 8348 YANG Hardware Management March 2018
2. Otherwise (i.e., there is no matching configuration
entry), the list entry in the operational state is
initialized with values for all nodes as detected by
the implementation.
If the '/hardware/component' list in the intended
configuration is modified, then the system MUST behave as if
it re-initializes itself and follow the procedure in (1).";
reference
"RFC 6933: Entity MIB (Version 4) - entPhysicalEntry";
leaf name {
type string;
description
"The name assigned to this component.
This name is not required to be the same as
entPhysicalName.";
}
leaf class {
type identityref {
base ianahw:hardware-class;
}
mandatory true;
description
"An indication of the general hardware type of the
component.";
reference
"RFC 6933: Entity MIB (Version 4) - entPhysicalClass";
}
leaf physical-index {
if-feature entity-mib;
type int32 {
range "1..2147483647";
}
config false;
description
"The entPhysicalIndex for the entPhysicalEntry represented
by this list entry.";
reference
"RFC 6933: Entity MIB (Version 4) - entPhysicalIndex";
}
leaf description {
type string;
config false;
Bierman, et al. Standards Track PAGE 22
RFC 8348 YANG Hardware Management March 2018
description
"A textual description of the component. This node should
contain a string that identifies the manufacturer's name
for the component and should be set to a distinct value
for each version or model of the component.";
reference
"RFC 6933: Entity MIB (Version 4) - entPhysicalDescr";
}
leaf parent {
type leafref {
path "../../component/name";
require-instance 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.
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";
}
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.
Note that the last rule gives implementations flexibility
in how components are numbered. For example, some
implementations might have a single number series for all
components derived from 'ianahw:port', while some others
might have different number series for different
Bierman, et al. Standards Track PAGE 23
RFC 8348 YANG Hardware Management March 2018
components with identities derived from 'ianahw:port' (for
example, one for registered jack 45 (RJ45) and one for
small form-factor pluggable (SFP)).";
reference
"RFC 6933: Entity MIB (Version 4) -
entPhysicalParentRelPos";
}
leaf-list contains-child {
type leafref {
path "../../component/name";
}
config false;
description
"The name of the contained component.";
reference
"RFC 6933: Entity MIB (Version 4) - entPhysicalChildIndex";
}
leaf hardware-rev {
type string;
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;
Bierman, et al. Standards Track PAGE 24
RFC 8348 YANG Hardware Management March 2018
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).
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.
Bierman, et al. Standards Track PAGE 25
RFC 8348 YANG Hardware Management March 2018
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;
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;
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 is-fru {
type boolean;
config false;
Bierman, et al. Standards Track PAGE 26
RFC 8348 YANG Hardware Management March 2018
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. For all components
that are permanently contained within a field-replaceable
unit, the value 'false' should be returned for this
node.";
reference
"RFC 6933: Entity MIB (Version 4) - entPhysicalIsFRU";
}
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;
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";
}
container state {
if-feature hardware-state;
description
"State-related nodes";
reference
"RFC 4268: Entity State MIB";
leaf state-last-changed {
type yang:date-and-time;
Bierman, et al. Standards Track PAGE 27
RFC 8348 YANG Hardware Management March 2018
config false;
description
"The date and time when the value of any of the
admin-state, oper-state, usage-state, alarm-state, or
standby-state changed for this component.
If there has been no change since the last
re-initialization of the local system, this node
contains the date and time of local system
initialization. If there has been no change since the
component was added to the local system, this node
contains the date and time of the insertion.";
reference
"RFC 4268: Entity State MIB - entStateLastChanged";
}
leaf admin-state {
type admin-state;
description
"The administrative state for this component.
This node refers to a component's administrative
permission to service both other components within its
containment hierarchy as well other users of its
services defined by means outside the scope of this
module.
Some components exhibit only a subset of the remaining
administrative state values. Some components cannot be
locked; hence, this node exhibits only the 'unlocked'
state. Other components cannot be shut down gracefully;
hence, this node does not exhibit the 'shutting-down'
state.";
reference
"RFC 4268: Entity State MIB - entStateAdmin";
}
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'.
Bierman, et al. Standards Track PAGE 28
RFC 8348 YANG Hardware Management March 2018
Note that some implementations may not be able to
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";
}
leaf usage-state {
type 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
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 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 standby-state;
config false;
description
"The standby state for this component.
Bierman, et al. Standards Track PAGE 29
RFC 8348 YANG Hardware Management March 2018
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";
}
}
container sensor-data {
when 'derived-from-or-self(../class,
"ianahw:sensor")' {
description
"Sensor data nodes present for any component of type
'sensor'";
}
if-feature hardware-sensor;
config false;
description
"Sensor-related nodes.";
reference
"RFC 3433: Entity Sensor Management Information Base";
leaf value {
type sensor-value;
description
"The most recent measurement obtained by the server
for this sensor.
A client that periodically fetches this node should also
fetch the nodes 'value-type', 'value-scale', and
'value-precision', since they may change when the value
is changed.";
reference
"RFC 3433: Entity Sensor Management Information Base -
entPhySensorValue";
}
leaf value-type {
type sensor-value-type;
description
"The type of data units associated with the
sensor value";
reference
"RFC 3433: Entity Sensor Management Information Base -
entPhySensorType";
}
Bierman, et al. Standards Track PAGE 30
RFC 8348 YANG Hardware Management March 2018
leaf value-scale {
type sensor-value-scale;
description
"The (power of 10) scaling factor associated
with the sensor value";
reference
"RFC 3433: Entity Sensor Management Information Base -
entPhySensorScale";
}
leaf value-precision {
type sensor-value-precision;
description
"The number of decimal places of precision
associated with the sensor value";
reference
"RFC 3433: Entity Sensor Management Information Base -
entPhySensorPrecision";
}
leaf oper-status {
type sensor-status;
description
"The operational status of the sensor.";
reference
"RFC 3433: Entity Sensor Management Information Base -
entPhySensorOperStatus";
}
leaf units-display {
type string;
description
"A textual description of the data units that should be
used in the display of the sensor value.";
reference
"RFC 3433: Entity Sensor Management Information Base -
entPhySensorUnitsDisplay";
}
leaf value-timestamp {
type yang:date-and-time;
description
"The time the status and/or value of this sensor was last
obtained by the server.";
reference
"RFC 3433: Entity Sensor Management Information Base -
entPhySensorValueTimeStamp";
}
Bierman, et al. Standards Track PAGE 31
RFC 8348 YANG Hardware Management March 2018
leaf value-update-rate {
type uint32;
units "milliseconds";
description
"An indication of the frequency that the server updates
the associated 'value' node, represented in
milliseconds. The value zero indicates:
- the sensor value is updated on demand (e.g.,
when polled by the server for a get-request),
- the sensor value is updated when the sensor
value changes (event-driven), or
- the server does not know the update rate.";
reference
"RFC 3433: Entity Sensor Management Information Base -
entPhySensorValueUpdateRate";
}
}
}
}
/*
* Notifications
*/
notification hardware-state-change {
description
"A hardware-state-change notification is generated when the
value of /hardware/last-change changes in the operational
state.";
reference
"RFC 6933: Entity MIB (Version 4) - entConfigChange";
}
notification hardware-state-oper-enabled {
if-feature hardware-state;
description
"A hardware-state-oper-enabled notification signifies that a
component has transitioned into the 'enabled' state.";
leaf name {
type leafref {
path "/hardware/component/name";
}
Bierman, et al. Standards Track PAGE 32
RFC 8348 YANG Hardware Management March 2018
description
"The name of the component that has transitioned into the
'enabled' state.";
}
leaf admin-state {
type leafref {
path "/hardware/component/state/admin-state";
}
description
"The administrative state for the component.";
}
leaf alarm-state {
type leafref {
path "/hardware/component/state/alarm-state";
}
description
"The alarm state for the component.";
}
reference
"RFC 4268: Entity State MIB - entStateOperEnabled";
}
notification hardware-state-oper-disabled {
if-feature hardware-state;
description
"A hardware-state-oper-disabled notification signifies that a
component has transitioned into the 'disabled' state.";
leaf name {
type leafref {
path "/hardware/component/name";
}
description
"The name of the component that has transitioned into the
'disabled' state.";
}
leaf admin-state {
type leafref {
path "/hardware/component/state/admin-state";
}
description
"The administrative state for the component.";
}
leaf alarm-state {
type leafref {
path "/hardware/component/state/alarm-state";
}
Bierman, et al. Standards Track PAGE 33
RFC 8348 YANG Hardware Management March 2018
description
"The alarm state for the component.";
}
reference
"RFC 4268: Entity State MIB - entStateOperDisabled";
}
}
<CODE ENDS>
7.2. "iana-hardware" Module
<CODE BEGINS> file "iana-hardware@2018-03-13.yang"
module iana-hardware {
yang-version 1.1;
namespace "urn:ietf:params:xml:ns:yang:iana-hardware";
prefix ianahw;
organization "IANA";
contact
" Internet Assigned Numbers Authority
Postal: ICANN
12025 Waterfront Drive, Suite 300
Los Angeles, CA 90094-2536
United States of America
Tel: +1 310 301 5800
E-Mail: iana@iana.org>";
description
"IANA-defined identities for hardware class.
The latest revision of this YANG module can be obtained from
the IANA website.
Requests for new values should be made to IANA via
email (iana@iana.org).
Copyright (c) 2018 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
Bierman, et al. Standards Track PAGE 34
RFC 8348 YANG Hardware Management March 2018
set forth in Section 4.c of the IETF Trust's Legal Provisions
Relating to IETF Documents
(https://trustee.ietf.org/license-info).
The initial version of this YANG module is part of RFC 8348;
see the RFC itself for full legal notices.";
reference
"https://www.iana.org/assignments/yang-parameters";
revision 2018-03-13 {
description
"Initial revision.";
reference
"RFC 8348: A YANG Data Model for Hardware Management";
}
/*
* Identities
*/
identity hardware-class {
description
"This identity is the base for all hardware class
identifiers.";
}
identity unknown {
base ianahw:hardware-class;
description
"This identity is applicable if the hardware class is unknown
to the server.";
}
identity chassis {
base ianahw:hardware-class;
description
"This identity is applicable if the hardware class is an
overall container for networking equipment. Any class of
physical component, except a stack, may be contained within a
chassis; a chassis may only be contained within a stack.";
}
identity backplane {
base ianahw:hardware-class;
description
"This identity is applicable if the hardware class is some sort
of device for aggregating and forwarding networking traffic,
such as a shared backplane in a modular ethernet switch. Note
Bierman, et al. Standards Track PAGE 35
RFC 8348 YANG Hardware Management March 2018
that an implementation may model a backplane as a single
physical component, which is actually implemented as multiple
discrete physical components (within a chassis or stack).";
}
identity container {
base ianahw:hardware-class;
description
"This identity is applicable if the hardware class is capable
of containing one or more removable physical entities,
possibly of different types. For example, each (empty or
full) slot in a chassis will be modeled as a container. Note
that all removable physical components should be modeled
within a container component, such as field-replaceable
modules, fans, or power supplies. Note that all known
containers should be modeled by the agent, including empty
containers.";
}
identity power-supply {
base ianahw:hardware-class;
description
"This identity is applicable if the hardware class is a
power-supplying component.";
}
identity fan {
base ianahw:hardware-class;
description
"This identity is applicable if the hardware class is a fan or
other heat-reduction component.";
}
identity sensor {
base ianahw:hardware-class;
description
"This identity is applicable if the hardware class is some sort
of sensor, such as a temperature sensor within a router
chassis.";
}
identity module {
base ianahw:hardware-class;
description
"This identity is applicable if the hardware class is some sort
of self-contained sub-system. If a module component is
removable, then it should be modeled within a container
Bierman, et al. Standards Track PAGE 36
RFC 8348 YANG Hardware Management March 2018
component; otherwise, it should be modeled directly within
another physical component (e.g., a chassis or another
module).";
}
identity port {
base ianahw:hardware-class;
description
"This identity is applicable if the hardware class is some sort
of networking port capable of receiving and/or transmitting
networking traffic.";
}
identity stack {
base ianahw:hardware-class;
description
"This identity is applicable if the hardware class is some sort
of super-container (possibly virtual) intended to group
together multiple chassis entities. A stack may be realized
by a virtual cable, a real interconnect cable attached to
multiple chassis, or multiple interconnect cables. A stack
should not be modeled within any other physical components,
but a stack may be contained within another stack. Only
chassis components should be contained within a stack.";
}
identity cpu {
base ianahw:hardware-class;
description
"This identity is applicable if the hardware class is some sort
of central processing unit.";
}
identity energy-object {
base ianahw:hardware-class;
description
"This identity is applicable if the hardware class is some sort
of energy object, i.e., it is a piece of equipment that is
part of or attached to a communications network that is
monitored, it is controlled, or it aids in the management of
another device for Energy Management.";
}
identity battery {
base ianahw:hardware-class;
description
"This identity is applicable if the hardware class is some sort
of battery.";
Bierman, et al. Standards Track PAGE 37
RFC 8348 YANG Hardware Management March 2018
}
identity storage-drive {
base ianahw:hardware-class;
description
"This identity is applicable if the hardware class is some sort
of component with data storage capability as its main
functionality, e.g., hard disk drive (HDD), solid-state device
(SSD), solid-state hybrid drive (SSHD), object storage device
(OSD), or other.";
}
}
<CODE ENDS>
8. IANA Considerations
This document defines the initial version of the IANA-maintained
"iana-hardware" YANG module.
The "iana-hardware" YANG module is intended to reflect the
"IANA-ENTITY-MIB" MIB module so that if a new enumeration is added to
the "IANAPhysicalClass" textual convention, the same class is added
as an identity derived from "ianahw:hardware-class".
When the "iana-hardware" YANG module is updated, a new "revision"
statement must be added in front of the existing revision statements.
8.1. URI Registrations
This document registers three URIs in the "IETF XML Registry"
[RFC 3688]. Per the format in RFC 3688, the following registrations
have been made.
URI: urn:ietf:params:xml:ns:yang:iana-hardware
Registrant Contact: The IESG.
XML: N/A, the requested URI is an XML namespace.
URI: urn:ietf:params:xml:ns:yang:ietf-hardware
Registrant Contact: The IESG.
XML: N/A, the requested URI is an XML namespace.
URI: urn:ietf:params:xml:ns:yang:ietf-hardware-state
Registrant Contact: The IESG.
XML: N/A, the requested URI is an XML namespace.
Bierman, et al. Standards Track PAGE 38
RFC 8348 YANG Hardware Management March 2018
8.2. YANG Module Registrations
This document registers three YANG modules in the "YANG Module Names"
registry [RFC 6020].
name: iana-hardware
namespace: urn:ietf:params:xml:ns:yang:iana-hardware
prefix: ianahw
reference: RFC 8348
name: ietf-hardware
namespace: urn:ietf:params:xml:ns:yang:ietf-hardware
prefix: hw
reference: RFC 8348
name: ietf-hardware-state
namespace: urn:ietf:params:xml:ns:yang:ietf-hardware-state
prefix: hw-state
reference: RFC 8348
9. Security Considerations
The YANG modules specified in this document define a schema for data
that is designed to be accessed via network management protocols such
as NETCONF [RFC 6241] or RESTCONF [RFC 8040]. The lowest NETCONF layer
is the secure transport layer, and the mandatory-to-implement secure
transport is Secure Shell (SSH) [RFC 6242]. The lowest RESTCONF layer
is HTTPS, and the mandatory-to-implement secure transport is TLS
[RFC 5246].
The NETCONF access control model [RFC 8341] provides the means to
restrict access for particular NETCONF or RESTCONF users to a
preconfigured subset of all available NETCONF or RESTCONF protocol
operations and content.
There are a number of data nodes defined in the YANG module
"ietf-hardware" that are writable/creatable/deletable (i.e., config
true, which is the default). These data nodes may be considered
sensitive or vulnerable in some network environments. Write
operations (e.g., edit-config) to these data nodes without proper
protection can have a negative effect on network operations. These
are the subtrees and data nodes and their sensitivity/vulnerability:
/hardware/component/admin-state: Setting this node to 'locked' or
'shutting-down' can cause disruption of services ranging from
those running on a port to those on an entire device, depending on
the type of component.
Bierman, et al. Standards Track PAGE 39
RFC 8348 YANG Hardware Management March 2018
Some of the readable data nodes in these YANG modules 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:
/hardware/component: The leafs in this list expose information about
the physical components in a device, which may be used to identify
the vendor, model, version, and specific device-identification
information of each system component.
/hardware/component/sensor-data/value: This node may expose the
values of particular physical sensors in a device.
/hardware/component/state: Access to this node allows one to figure
out what the active and standby resources in a device are.
10. References
10.1. Normative References
[RFC 2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC 2119, March 1997,
<https://www.rfc-editor.org/info/RFC 2119>.
[RFC 3433] Bierman, A., Romascanu, D., and K. Norseth, "Entity Sensor
Management Information Base", RFC 3433,
DOI 10.17487/RFC 3433, December 2002,
<https://www.rfc-editor.org/info/RFC 3433>.
[RFC 3688] Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688,
DOI 10.17487/RFC 3688, January 2004,
<https://www.rfc-editor.org/info/RFC 3688>.
[RFC 4268] Chisholm, S. and D. Perkins, "Entity State MIB", RFC 4268,
DOI 10.17487/RFC 4268, November 2005,
<https://www.rfc-editor.org/info/RFC 4268>.
[RFC 5246] Dierks, T. and E. Rescorla, "The Transport Layer Security
(TLS) Protocol Version 1.2", RFC 5246,
DOI 10.17487/RFC 5246, August 2008,
<https://www.rfc-editor.org/info/RFC 5246>.
[RFC 6020] Bjorklund, M., Ed., "YANG - A Data Modeling Language for
the Network Configuration Protocol (NETCONF)", RFC 6020,
DOI 10.17487/RFC 6020, October 2010,
<https://www.rfc-editor.org/info/RFC 6020>.
Bierman, et al. Standards Track PAGE 40
RFC 8348 YANG Hardware Management March 2018
[RFC 6241] Enns, R., Ed., Bjorklund, M., Ed., Schoenwaelder, J., Ed.,
and A. Bierman, Ed., "Network Configuration Protocol
(NETCONF)", RFC 6241, DOI 10.17487/RFC 6241, June 2011,
<https://www.rfc-editor.org/info/RFC 6241>.
[RFC 6242] Wasserman, M., "Using the NETCONF Protocol over Secure
Shell (SSH)", RFC 6242, DOI 10.17487/RFC 6242, June 2011,
<https://www.rfc-editor.org/info/RFC 6242>.
[RFC 6933] Bierman, A., Romascanu, D., Quittek, J., and M.
Chandramouli, "Entity MIB (Version 4)", RFC 6933,
DOI 10.17487/RFC 6933, May 2013,
<https://www.rfc-editor.org/info/RFC 6933>.
[RFC 6991] Schoenwaelder, J., Ed., "Common YANG Data Types",
RFC 6991, DOI 10.17487/RFC 6991, July 2013,
<https://www.rfc-editor.org/info/RFC 6991>.
[RFC 7950] Bjorklund, M., Ed., "The YANG 1.1 Data Modeling Language",
RFC 7950, DOI 10.17487/RFC 7950, August 2016,
<https://www.rfc-editor.org/info/RFC 7950>.
[RFC 8040] Bierman, A., Bjorklund, M., and K. Watsen, "RESTCONF
Protocol", RFC 8040, DOI 10.17487/RFC 8040, January 2017,
<https://www.rfc-editor.org/info/RFC 8040>.
[RFC 8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC 8174,
May 2017, <https://www.rfc-editor.org/info/RFC 8174>.
[RFC 8341] Bierman, A. and M. Bjorklund, "Network Configuration
Access Control Model", STD 91, RFC 8341,
DOI 10.17487/RFC 8341, March 2018,
<https://www.rfc-editor.org/info/RFC 8341>.
[RFC 8342] Bjorklund, M., Schoenwaelder, J., Shafer, P., Watsen, K.,
and R. Wilton, "Network Management Datastore Architecture
(NMDA)", RFC 8342, DOI 10.17487/RFC 8342, March 2018,
<https://www.rfc-editor.org/info/RFC 8342>.
10.2. Informative References
[RFC 8340] Bjorklund, M. and L. Berger, Ed., "YANG Tree Diagrams",
BCP 215, RFC 8340, DOI 10.17487/RFC 8340, March 2018,
<https://www.rfc-editor.org/info/RFC 8340>.
Bierman, et al. Standards Track PAGE 41
RFC 8348 YANG Hardware Management March 2018
Appendix A. Hardware State Data Model
This non-normative appendix contains a data model designed as a
temporary solution for implementations that do not yet support the
Network Management Datastore Architecture (NMDA) defined in
[RFC 8342]. It has the following structure:
module: ietf-hardware-state
x--ro hardware
x--ro last-change? yang:date-and-time
x--ro component* [name]
x--ro name string
x--ro class identityref
x--ro physical-index? int32 {entity-mib}?
x--ro description? string
x--ro parent? -> ../../component/name
x--ro parent-rel-pos? int32
x--ro contains-child* -> ../../component/name
x--ro hardware-rev? string
x--ro firmware-rev? string
x--ro software-rev? string
x--ro serial-num? string
x--ro mfg-name? string
x--ro model-name? string
x--ro alias? string
x--ro asset-id? string
x--ro is-fru? boolean
x--ro mfg-date? yang:date-and-time
x--ro uri* inet:uri
x--ro uuid? yang:uuid
x--ro state {hardware-state}?
| x--ro state-last-changed? yang:date-and-time
| x--ro admin-state? hw:admin-state
| x--ro oper-state? hw:oper-state
| x--ro usage-state? hw:usage-state
| x--ro alarm-state? hw:alarm-state
| x--ro standby-state? hw:standby-state
x--ro sensor-data {hardware-sensor}?
x--ro value? hw:sensor-value
x--ro value-type? hw:sensor-value-type
x--ro value-scale? hw:sensor-value-scale
x--ro value-precision? hw:sensor-value-precision
x--ro oper-status? hw:sensor-status
x--ro units-display? string
x--ro value-timestamp? yang:date-and-time
x--ro value-update-rate? uint32
Bierman, et al. Standards Track PAGE 42
RFC 8348 YANG Hardware Management March 2018
notifications:
x---n hardware-state-change
x---n hardware-state-oper-enabled {hardware-state}?
| x--ro name? -> /hardware/component/name
| x--ro admin-state? -> /hardware/component/state/admin-state
| x--ro alarm-state? -> /hardware/component/state/alarm-state
x---n hardware-state-oper-disabled {hardware-state}?
x--ro name? -> /hardware/component/name
x--ro admin-state? -> /hardware/component/state/admin-state
x--ro alarm-state? -> /hardware/component/state/alarm-state
A.1. Hardware State YANG Module
<CODE BEGINS> file "ietf-hardware-state@2018-03-13.yang"
module ietf-hardware-state {
yang-version 1.1;
namespace "urn:ietf:params:xml:ns:yang:ietf-hardware-state";
prefix hw-state;
import ietf-inet-types {
prefix inet;
}
import ietf-yang-types {
prefix yang;
}
import iana-hardware {
prefix ianahw;
}
import ietf-hardware {
prefix hw;
}
organization
"IETF NETMOD (Network Modeling) Working Group";
contact
"WG Web: <https://datatracker.ietf.org/wg/netmod/>
WG List: <mailto:netmod@ietf.org>
Editor: Andy Bierman
<mailto:andy@yumaworks.com>
Editor: Martin Bjorklund
<mailto:mbj@tail-f.com>
Editor: Jie Dong
<mailto:jie.dong@huawei.com>
Bierman, et al. Standards Track PAGE 43
RFC 8348 YANG Hardware Management March 2018
Editor: Dan Romascanu
<mailto:dromasca@gmail.com>";
description
"This module contains a collection of YANG definitions for
monitoring hardware.
This data model is designed as a temporary solution for
implementations that do not yet support the Network Management
Datastore Architecture (NMDA) defined in RFC 8342. Such an
implementation cannot implement the module 'ietf-hardware'
properly, since without NMDA support, it is not possible to
distinguish between instances of nodes in the running
configuration and operational states.
The data model in this module is the same as the data model in
'ietf-hardware', except all nodes are marked as 'config false'.
If a server that implements this module but doesn't support NMDA
also supports configuration of hardware components, it SHOULD
also implement the module 'ietf-hardware' in the configuration
datastores. The corresponding state data is found in the
'/hw-state:hardware' subtree.
Copyright (c) 2018 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).
This version of this YANG module is part of RFC 8348; see
the RFC itself for full legal notices.";
revision 2018-03-13 {
description
"Initial revision.";
reference
"RFC 8348: A YANG Data Model for Hardware Management";
}
/*
* Features
*/
Bierman, et al. Standards Track PAGE 44
RFC 8348 YANG Hardware Management March 2018
feature entity-mib {
status deprecated;
description
"This feature indicates that the device implements
the ENTITY-MIB.";
reference
"RFC 6933: Entity MIB (Version 4)";
}
feature hardware-state {
status deprecated;
description
"Indicates that ENTITY-STATE-MIB objects are supported";
reference
"RFC 4268: Entity State MIB";
}
feature hardware-sensor {
status deprecated;
description
"Indicates that ENTITY-SENSOR-MIB objects are supported";
reference
"RFC 3433: Entity Sensor Management Information Base";
}
/*
* Data nodes
*/
container hardware {
config false;
status deprecated;
description
"Data nodes representing components.";
leaf last-change {
type yang:date-and-time;
status deprecated;
description
"The time the '/hardware/component' list changed in the
operational state.";
}
list component {
key name;
status deprecated;
description
"List of components.
Bierman, et al. Standards Track PAGE 45
RFC 8348 YANG Hardware Management March 2018
When the server detects a new hardware component, it
initializes a list entry in the operational state.
If the server does not support configuration of hardware
components, list entries in the operational state are
initialized with values for all nodes as detected by the
implementation.
Otherwise, this procedure is followed:
1. If there is an entry in the '/hardware/component' list
in the intended configuration with values for the nodes
'class', 'parent', and 'parent-rel-pos' that are equal
to the detected values, then:
1a. If the configured entry has a value for 'mfg-name'
that is equal to the detected value or if the
'mfg-name' value cannot be detected, then the list
entry in the operational state is initialized with the
configured values for all configured nodes, including
the 'name'.
Otherwise, the list entry in the operational state is
initialized with values for all nodes as detected by
the implementation. The implementation may raise an
alarm that informs about the 'mfg-name' mismatch
condition. How this is done is outside the scope of
this document.
1b. Otherwise (i.e., there is no matching configuration
entry), the list entry in the operational state is
initialized with values for all nodes as detected by
the implementation.
If the '/hardware/component' list in the intended
configuration is modified, then the system MUST behave as if
it re-initializes itself and follow the procedure in (1).";
reference
"RFC 6933: Entity MIB (Version 4) - entPhysicalEntry";
leaf name {
type string;
status deprecated;
description
"The name assigned to this component.
This name is not required to be the same as
entPhysicalName.";
Bierman, et al. Standards Track PAGE 46
RFC 8348 YANG Hardware Management March 2018
}
leaf class {
type identityref {
base ianahw:hardware-class;
}
mandatory true;
status deprecated;
description
"An indication of the general hardware type of the
component.";
reference
"RFC 6933: Entity MIB (Version 4) - entPhysicalClass";
}
leaf physical-index {
if-feature entity-mib;
type int32 {
range "1..2147483647";
}
status deprecated;
description
"The entPhysicalIndex for the entPhysicalEntry represented
by this list entry.";
reference
"RFC 6933: Entity MIB (Version 4) - entPhysicalIndex";
}
leaf description {
type string;
status deprecated;
description
"A textual description of the component. This node should
contain a string that identifies the manufacturer's name
for the component and should be set to a distinct value
for each version or model of the component.";
reference
"RFC 6933: Entity MIB (Version 4) - entPhysicalDescr";
}
leaf parent {
type leafref {
path "../../component/name";
require-instance false;
}
status deprecated;
Bierman, et al. Standards Track PAGE 47
RFC 8348 YANG Hardware Management March 2018
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.
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";
}
status deprecated;
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.
Note that the last rule gives implementations flexibility
in how components are numbered. For example, some
implementations might have a single number series for all
components derived from 'ianahw:port', while some others
might have different number series for different
components with identities derived from 'ianahw:port' (for
example, one for RJ45 and one for SFP).";
reference
"RFC 6933: Entity MIB (Version 4) -
entPhysicalParentRelPos";
}
leaf-list contains-child {
type leafref {
path "../../component/name";
}
Bierman, et al. Standards Track PAGE 48
RFC 8348 YANG Hardware Management March 2018
status deprecated;
description
"The name of the contained component.";
reference
"RFC 6933: Entity MIB (Version 4) - entPhysicalChildIndex";
}
leaf hardware-rev {
type string;
status deprecated;
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;
status deprecated;
description
"The vendor-specific firmware revision string for the
component.";
reference
"RFC 6933: Entity MIB (Version 4) -
entPhysicalFirmwareRev";
}
leaf software-rev {
type string;
status deprecated;
description
"The vendor-specific software revision string for the
component.";
reference
"RFC 6933: Entity MIB (Version 4) -
entPhysicalSoftwareRev";
}
leaf serial-num {
type string;
status deprecated;
Bierman, et al. Standards Track PAGE 49
RFC 8348 YANG Hardware Management March 2018
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;
status deprecated;
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).
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;
status deprecated;
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;
status deprecated;
Bierman, et al. Standards Track PAGE 50
RFC 8348 YANG Hardware Management March 2018
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;
status deprecated;
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 is-fru {
type boolean;
status deprecated;
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. For all components
that are permanently contained within a field-replaceable
unit, the value 'false' should be returned for this
node.";
Bierman, et al. Standards Track PAGE 51
RFC 8348 YANG Hardware Management March 2018
reference
"RFC 6933: Entity MIB (Version 4) - entPhysicalIsFRU";
}
leaf mfg-date {
type yang:date-and-time;
status deprecated;
description
"The date of manufacturing of the managed component.";
reference
"RFC 6933: Entity MIB (Version 4) - entPhysicalMfgDate";
}
leaf-list uri {
type inet:uri;
status deprecated;
description
"This node contains identification information about the
component.";
reference
"RFC 6933: Entity MIB (Version 4) - entPhysicalUris";
}
leaf uuid {
type yang:uuid;
status deprecated;
description
"A Universally Unique Identifier of the component.";
reference
"RFC 6933: Entity MIB (Version 4) - entPhysicalUUID";
}
container state {
if-feature hardware-state;
status deprecated;
description
"State-related nodes";
reference
"RFC 4268: Entity State MIB";
leaf state-last-changed {
type yang:date-and-time;
status deprecated;
description
"The date and time when the value of any of the
admin-state, oper-state, usage-state, alarm-state, or
standby-state changed for this component.
Bierman, et al. Standards Track PAGE 52
RFC 8348 YANG Hardware Management March 2018
If there has been no change since the last
re-initialization of the local system, this node
contains the date and time of local system
initialization. If there has been no change since the
component was added to the local system, this node
contains the date and time of the insertion.";
reference
"RFC 4268: Entity State MIB - entStateLastChanged";
}
leaf admin-state {
type hw:admin-state;
status deprecated;
description
"The administrative state for this component.
This node refers to a component's administrative
permission to service both other components within its
containment hierarchy as well as other users of its
services defined by means outside the scope of this
module.
Some components exhibit only a subset of the remaining
administrative state values. Some components cannot be
locked; hence, this node exhibits only the 'unlocked'
state. Other components cannot be shut down gracefully;
hence, this node does not exhibit the 'shutting-down'
state.";
reference
"RFC 4268: Entity State MIB - entStateAdmin";
}
leaf oper-state {
type hw:oper-state;
status deprecated;
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
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";
Bierman, et al. Standards Track PAGE 53
RFC 8348 YANG Hardware Management March 2018
}
leaf usage-state {
type hw:usage-state;
status deprecated;
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
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;
status deprecated;
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;
status deprecated;
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";
}
}
Bierman, et al. Standards Track PAGE 54
RFC 8348 YANG Hardware Management March 2018
container sensor-data {
when 'derived-from-or-self(../class,
"ianahw:sensor")' {
description
"Sensor data nodes present for any component of type
'sensor'";
}
if-feature hardware-sensor;
status deprecated;
description
"Sensor-related nodes.";
reference
"RFC 3433: Entity Sensor Management Information Base";
leaf value {
type hw:sensor-value;
status deprecated;
description
"The most recent measurement obtained by the server
for this sensor.
A client that periodically fetches this node should also
fetch the nodes 'value-type', 'value-scale', and
'value-precision', since they may change when the value
is changed.";
reference
"RFC 3433: Entity Sensor Management Information Base -
entPhySensorValue";
}
leaf value-type {
type hw:sensor-value-type;
status deprecated;
description
"The type of data units associated with the
sensor value";
reference
"RFC 3433: Entity Sensor Management Information Base -
entPhySensorType";
}
leaf value-scale {
type hw:sensor-value-scale;
status deprecated;
description
"The (power of 10) scaling factor associated
with the sensor value";
Bierman, et al. Standards Track PAGE 55
RFC 8348 YANG Hardware Management March 2018
reference
"RFC 3433: Entity Sensor Management Information Base -
entPhySensorScale";
}
leaf value-precision {
type hw:sensor-value-precision;
status deprecated;
description
"The number of decimal places of precision
associated with the sensor value";
reference
"RFC 3433: Entity Sensor Management Information Base -
entPhySensorPrecision";
}
leaf oper-status {
type hw:sensor-status;
status deprecated;
description
"The operational status of the sensor.";
reference
"RFC 3433: Entity Sensor Management Information Base -
entPhySensorOperStatus";
}
leaf units-display {
type string;
status deprecated;
description
"A textual description of the data units that should be
used in the display of the sensor value.";
reference
"RFC 3433: Entity Sensor Management Information Base -
entPhySensorUnitsDisplay";
}
leaf value-timestamp {
type yang:date-and-time;
status deprecated;
description
"The time the status and/or value of this sensor was last
obtained by the server.";
reference
"RFC 3433: Entity Sensor Management Information Base -
entPhySensorValueTimeStamp";
}
Bierman, et al. Standards Track PAGE 56
RFC 8348 YANG Hardware Management March 2018
leaf value-update-rate {
type uint32;
units "milliseconds";
status deprecated;
description
"An indication of the frequency that the server updates
the associated 'value' node, represented in
milliseconds. The value zero indicates:
- the sensor value is updated on demand (e.g.,
when polled by the server for a get-request),
- the sensor value is updated when the sensor
value changes (event-driven), or
- the server does not know the update rate.";
reference
"RFC 3433: Entity Sensor Management Information Base -
entPhySensorValueUpdateRate";
}
}
}
}
/*
* Notifications
*/
notification hardware-state-change {
status deprecated;
description
"A hardware-state-change notification is generated when the
value of /hardware/last-change changes in the operational
state.";
reference
"RFC 6933: Entity MIB (Version 4) - entConfigChange";
}
notification hardware-state-oper-enabled {
if-feature hardware-state;
status deprecated;
description
"A hardware-state-oper-enabled notification signifies that a
component has transitioned into the 'enabled' state.";
leaf name {
type leafref {
path "/hardware/component/name";
Bierman, et al. Standards Track PAGE 57
RFC 8348 YANG Hardware Management March 2018
}
status deprecated;
description
"The name of the component that has transitioned into the
'enabled' state.";
}
leaf admin-state {
type leafref {
path "/hardware/component/state/admin-state";
}
status deprecated;
description
"The administrative state for the component.";
}
leaf alarm-state {
type leafref {
path "/hardware/component/state/alarm-state";
}
status deprecated;
description
"The alarm state for the component.";
}
reference
"RFC 4268: Entity State MIB - entStateOperEnabled";
}
notification hardware-state-oper-disabled {
if-feature hardware-state;
status deprecated;
description
"A hardware-state-oper-disabled notification signifies that a
component has transitioned into the 'disabled' state.";
leaf name {
type leafref {
path "/hardware/component/name";
}
status deprecated;
description
"The name of the component that has transitioned into the
'disabled' state.";
}
leaf admin-state {
type leafref {
path "/hardware/component/state/admin-state";
}
status deprecated;
Bierman, et al. Standards Track PAGE 58
RFC 8348 YANG Hardware Management March 2018
description
"The administrative state for the component.";
}
leaf alarm-state {
type leafref {
path "/hardware/component/state/alarm-state";
}
status deprecated;
description
"The alarm state for the component.";
}
reference
"RFC 4268: Entity State MIB - entStateOperDisabled";
}
}
<CODE ENDS>
Bierman, et al. Standards Track PAGE 59
RFC 8348 YANG Hardware Management March 2018
Acknowledgments
The authors wish to thank the following individuals, who all provided
helpful comments on various draft versions of this document: Bart
Bogaert, Timothy Carey, William Lupton, and Juergen Schoenwaelder.
Authors' Addresses
Andy Bierman
YumaWorks
Email: andy@yumaworks.com
Martin Bjorklund
Tail-f Systems
Email: mbj@tail-f.com
Jie Dong
Huawei Technologies
Email: jie.dong@huawei.com
Dan Romascanu
Email: dromasca@gmail.com
Bierman, et al. Standards Track PAGE 60
A YANG Data Model for Hardware Management
RFC TOTAL SIZE: 108230 bytes
PUBLICATION DATE: Tuesday, March 27th, 2018
LEGAL RIGHTS: The IETF Trust (see BCP 78)
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