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ietf-hardware@2017-03-07



  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 (NETCONF Data Modeling Language) Working Group";

    contact
      "WG Web:   <http://tools.ietf.org/wg/netmod/>
     WG List:  <mailto:netmod@ietf.org>

     WG Chair: Lou Berger
               <mailto:lberger@labn.net>

     WG Chair: Kent Watsen
               <mailto:kwatsen@juniper.net>

     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.

     Copyright (c) 2017 IETF Trust and the persons identified as
     authors of the code.  All rights reserved.

     Redistribution and use in source and binary forms, with or
     without modification, is permitted pursuant to, and subject
     to the license terms contained in, the Simplified BSD License
     set forth in Section 4.c of the IETF Trust's Legal Provisions
     Relating to IETF Documents
     (http://trustee.ietf.org/license-info).
     This version of this YANG module is part of RFC XXXX; see
     the RFC itself for full legal notices.";

    revision "2017-03-07" {
      description "Initial revision.";
      reference
        "RFC XXXX: A YANG Data Model for Hardware Management";

    }


    feature entity-mib {
      description
        "This feature indicates that the device implements
       the ENTITY-MIB.";
      reference
        "RFC 6933: Entity MIB (Version 4)";

    }

    feature hardware-config {
      description
        "Indicates that the server supports configuration of
       hardware components.";
    }

    feature hardware-state {
      description
        "Indicates the ENTITY-STATE-MIB objects are supported";
      reference
        "RFC 4268: Entity State MIB";

    }

    feature hardware-sensor {
      description
        "Indicates the ENTITY-SENSOR-MIB objects are supported";
      reference
        "RFC 3433: Entity Sensor MIB";

    }

    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: EntityAdminState";

    }

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

    }

    typedef alarm-state {
      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.

       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: 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 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: EntityStandbyStatus";

    }

    typedef sensor-value-type {
      type enumeration {
        enum "other" {
          value 1;
          description
            "A measure other than those listed below.";
        }
        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;
          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 sensor-value-precision. These
       three types are used to identify the semantics of a node of
       type sensor-value.";
      reference
        "RFC 3433: 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;
          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 "exa" {
          value 14;
          description
            "Data scaling factor of 10^15.";
        }
        enum "peta" {
          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 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: EntitySensorDataScale";

    }

    typedef sensor-value-precision {
      type int32 {
        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 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.

       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 degrees to 100 degrees C in 0.1 degree
       increments, +/- 0.05 degrees, would have an
       sensor-value-precision value of '1', an sensor-value-scale
       value of 'units', and an sensor-value ranging from '0' to
       '1000'.  The sensor-value would be interpreted as
       'degrees C * 10'.";
      reference
        "RFC 3433: EntitySensorPrecision";

    }

    typedef sensor-value {
      type int32 {
        range "-1000000000 .. 1000000000";
      }
      description
        "A node using this data type represents an sensor value.

      A node of this type SHOULD be defined together with nodes of
      type sensor-value-type, sensor-value-scale, and
      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.

      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: 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: EntitySensorStatus";

    }

    container hardware-state {
      config false;
      description
        "Data nodes for the operational state of components.";
      leaf last-change {
        type yang:date-and-time;
        description
          "The time the '/hardware-state/component' list changed.";
      }

      list component {
        key "name";
        description
          "List of components.

         When the server detects a new hardware component, it
         initializes an entry in this list.

         If the server does not support the feature
         'hardware-config', the entry is initialized with values for
         all nodes as detected by the implementation.

         Otherwise, the following procedure is followed:

           1. If there is an entry in the /hardware/component list
              with values for the nodes 'class', 'parent',
              '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 entry is
               initialized with the configured values for all
               configured leafs, including the 'name'.

               Otherwise, the entry 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 entry is initialized with values for all
               nodes as detected by the implementation.

         If the /hardware/component list is modified (i.e., someone
         changed the configuration), then the system MUST behave as
         if it re-initializes itself, and follow the procedure in
         (1).";
        reference
          "RFC 6933: 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: entPhysicalClass";

        }

        leaf physical-index {
          if-feature entity-mib;
          type int32 {
            range "1..2147483647";
          }
          description
            "The entPhysicalIndex for the entPhysicalEntry represented
           by this list entry.";
          reference
            "RFC 6933: entPhysicalIndex";

        }

        leaf description {
          type string;
          description
            "A textual description of 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: entPhysicalDescr";

        }

        leaf parent {
          type leafref {
            path "../../component/name";
          }
          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: 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 share the same
           instance values of each of the 'parent' and 'class'
           nodes.";
          reference
            "RFC 6933: entPhysicalParentRelPos";

        }

        leaf-list contains-child {
          type leafref {
            path "../../component/name";
          }
          description
            "The name of the contained component.";
          reference
            "RFC 6933: entPhysicalChildIndex";

        }

        leaf hardware-rev {
          type string;
          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: entPhysicalHardwareRev";

        }

        leaf firmware-rev {
          type string;
          description
            "The vendor-specific firmware revision string for the
           component.";
          reference
            "RFC 6933: entPhysicalFirmwareRev";

        }

        leaf software-rev {
          type string;
          description
            "The vendor-specific software revision string for the
           component.";
          reference
            "RFC 6933: entPhysicalSoftwareRev";

        }

        leaf serial-num {
          type string;
          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).

           If a serial number has been configured for this component
           in /hardware/component/serial-num, this node contains the
           configured value.";
          reference
            "RFC 6933: entPhysicalSerialNum";

        }

        leaf mfg-name {
          type string;
          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 the serial-num nodes are
           only meaningful amongst component 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: entPhysicalMfgName";

        }

        leaf model-name {
          type string;
          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: entPhysicalModelName";

        }

        leaf alias {
          type string;
          description
            "An 'alias' name for the component, as specified by a
           network manager, and provides a non-volatile 'handle' for
           the component.

           If an alias has been configured for this component in
           /hardware/component/alias, this node contains the
           configured value.  If no such alias has been configured,
           the server may set the value of this node to a locally
           unique value.";
          reference
            "RFC 6933: entPhysicalAlias";

        }

        leaf asset-id {
          type string;
          description
            "This node is a user-assigned asset tracking identifier for
           the component.

           If an asset tracking identifier has been configured for
           this component in /hardware/component/asset-id, this node
           contains the configured value.";
          reference
            "RFC 6933: entPhysicalAssetID";

        }

        leaf is-fru {
          type boolean;
          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: entPhysicalIsFRU";

        }

        leaf mfg-date {
          type yang:date-and-time;
          description
            "The date of manufacturing of the managed component.";
          reference
            "RFC 6933: entPhysicalMfgDate";

        }

        leaf-list uri {
          type inet:uri;
          description
            "This node contains identification information about the
           component.

           If uris have been configured for this component in
           /hardware/component/uri, this node contains the configured
           values.";
          reference
            "RFC 6933: entPhysicalUris";

        }

        leaf uuid {
          type yang:uuid;
          description
            "A Universally Unique Identifier of the component.";
          reference
            "RFC 6933: 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;
            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: 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, and hence this node exhibits only the 'unlocked'
             state.  Other components cannot be shutdown gracefully,
             and hence this node does not exhibit the 'shutting-down'
             state.";
            reference
              "RFC 4268: entStateAdmin";

          }

          leaf oper-state {
            type oper-state;
            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: entStateOper";

          }

          leaf usage-state {
            type usage-state;
            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'.  Some
             components will only ever be able to support one
             component within its containment hierarchy and will
             therefore only exhibit values of 'idle' and 'busy'.";
            reference
              "RFC 4268, entStateUsage";

          }

          leaf alarm-state {
            type alarm-state;
            description
              "The alarm state for this component.  It does not
             include the alarms raised on child components within its
             containment hierarchy.";
            reference
              "RFC 4268: entStateAlarm";

          }

          leaf standby-state {
            type standby-state;
            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: entStateStandby";

          }
        }  // container state

        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;
          description
            "Sensor-related nodes.";
          reference
            "RFC 3433: Entity Sensor MIB";

          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: entPhySensorValue";

          }

          leaf value-type {
            type sensor-value-type;
            description
              "The type of data units associated with the
             sensor value";
            reference
              "RFC 3433: entPhySensorType";

          }

          leaf value-scale {
            type sensor-value-scale;
            description
              "The (power of 10) scaling factor associated
             with the sensor value";
            reference
              "RFC 3433: entPhySensorScale";

          }

          leaf value-precision {
            type sensor-value-precision;
            description
              "The number of decimal places of precision
             associated with the sensor value";
            reference
              "RFC 3433: entPhySensorPrecision";

          }

          leaf oper-status {
            type sensor-status;
            description
              "The operational status of the sensor.";
            reference
              "RFC 3433: 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: 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: entPhySensorValueTimeStamp";

          }

          leaf value-update-rate {
            type uint32;
            units "milliseconds";
            description
              "An indication of the frequency that the server updates
             the associated 'value' node, representing 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),
              - the server does not know the update rate.";
            reference
              "RFC 3433: entPhySensorValueUpdateRate";

          }
        }  // container sensor-data
      }  // list component
    }  // container hardware-state

    container hardware {
      if-feature hardware-config;
      description
        "Configuration parameters for components.";
      list component {
        key "name";
        description
          "List of configuration data for components.

         See the description of /hardware-state/component for
         information on how this list is used by a server.";
        leaf name {
          type string;
          description
            "Administrative name for this component.  No restrictions
           apply.";
        }

        leaf class {
          type identityref {
            base ianahw:hardware-class;
          }
          mandatory true;
          description
            "An indication of the general hardware type of the
           component.";
          reference
            "RFC 6933: entPhysicalClass";

        }

        leaf parent {
          type leafref {
            path "/hardware-state/component/name";
          }
          description
            "The name of the component that contains this component.";
          reference
            "RFC 6933: 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 share the same
           instance values of each of the 'parent' and 'class'
           nodes.";
          reference
            "RFC 6933: entPhysicalParentRelPos";

        }

        leaf mfg-name {
          type string;
          description
            "The name of the manufacturer of this physical component.";
          reference
            "RFC 6933: entPhysicalMfgName";

        }

        leaf serial-num {
          type string;
          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).

           This node is indented to be used for components for which
           the server cannot determine the serial number.";
          reference
            "RFC 6933: entPhysicalSerialNum";

        }

        leaf alias {
          type string;
          description
            "This node is an 'alias' name for the component, as
           specified by a network manager, and provides a non-
           volatile 'handle' for the component.

           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: entPhysicalAlias";

        }

        leaf asset-id {
          type string;
          description
            "This node is a user-assigned asset tracking identifier (as
           specified by a network manager) 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: entPhysicalAssetID";

        }

        leaf-list uri {
          type inet:uri;
          description
            "This node contains identification information about the
           component.";
          reference
            "RFC 6933: entPhysicalUris";

        }

        leaf admin-state {
          if-feature hardware-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, and hence this node exhibits only the 'unlocked'
           state.  Other components cannot be shutdown gracefully,
           and hence this node does not exhibit the 'shutting-down'
           state.";
          reference
            "RFC 4268, entStateAdmin";

        }
      }  // list component
    }  // container hardware

    notification hardware-state-change {
      description
        "A hardware-state-change notification is generated when the
       value of /hardware-state/last-change changes.";
      reference
        "RFC 6933, entConfigChange";

    }  // notification hardware-state-change

    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.";
      reference
        "RFC 4268, entStateOperEnabled";

      leaf name {
        type leafref {
          path "/hardware-state/component/name";
        }
        description
          "The name of the component that has transitioned into the
         'enabled' state.";
      }

      leaf admin-state {
        type leafref {
          path "/hardware-state/component/state/admin-state";
        }
        description
          "The administrative state for the component.";
      }

      leaf alarm-state {
        type leafref {
          path "/hardware-state/component/state/alarm-state";
        }
        description
          "The alarm state for the component.";
      }
    }  // notification hardware-state-oper-enabled

    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.";
      reference
        "RFC 4268, entStateOperDisabled";

      leaf name {
        type leafref {
          path "/hardware-state/component/name";
        }
        description
          "The name of the component that has transitioned into the
         'disabled' state.";
      }

      leaf admin-state {
        type leafref {
          path "/hardware-state/component/state/admin-state";
        }
        description
          "The administrative state for the component.";
      }

      leaf alarm-state {
        type leafref {
          path "/hardware-state/component/state/alarm-state";
        }
        description
          "The alarm state for the component.";
      }
    }  // notification hardware-state-oper-disabled
  }  // module ietf-hardware