not to return a community string which allows more
            privileges than the community string used to access this
            object.

            A compliant SNMP agent may wish to conserve naming scopes by
            representing multiple logical entities in a single 'default'
            naming scope.  This is possible when the logical entities
            represented by the same value of entLogicalCommunity have no
            object instances in common.  For example, 'bridge1' and
            'repeater1' may be part of the main naming scope, but at
            least one additional community string is needed to represent
            'bridge2' and 'repeater2'.

            Logical entities 'bridge1' and 'repeater1' would be
            represented by sysOREntries associated with the 'default'
            naming scope.

            For agents not accessible via SNMPv1 or SNMPv2C, the value
            of this object is the empty string.  This object may also
            contain an empty string if a community string has not yet
            been assigned by the agent, or no community string with
            suitable access rights can be returned for a particular SNMP
            request.

            Note that this object is deprecated. Agents which implement
            SNMPv3 access should use the entLogicalContextEngineID and
            entLogicalContextName objects to identify the context
            associated with each logical entity.  SNMPv3 agents may
            return a zero-length string for this object, or may continue
            to return a community string (e.g., tri-lingual agent
            support)."
    ::= { entLogicalEntry 4 }

entLogicalTAddress OBJECT-TYPE
    SYNTAX      TAddress
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "The transport service address by which the logical entity
            receives network management traffic, formatted according to
            the corresponding value of entLogicalTDomain.

            For snmpUDPDomain, a TAddress is 6 octets long, the initial
            4 octets containing the IP-address in network-byte order and
            the last 2 containing the UDP port in network-byte order.
            Consult 'Transport Mappings for Version 2 of the Simple
            Network Management Protocol' (RFC 1906 [RFC1906]) for
            further information on snmpUDPDomain."

    ::= { entLogicalEntry 5 }

entLogicalTDomain OBJECT-TYPE
    SYNTAX      TDomain
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "Indicates the kind of transport service by which the
            logical entity receives network management traffic.
            Possible values for this object are presently found in the
            Transport Mappings for SNMPv2 document (RFC 1906
            [RFC1906])."
    ::= { entLogicalEntry 6 }

entLogicalContextEngineID    OBJECT-TYPE
    SYNTAX      SnmpEngineIdOrNone
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "The authoritative contextEngineID that can be used to send
            an SNMP message concerning information held by this logical
            entity, to the address specified by the associated
            'entLogicalTAddress/entLogicalTDomain' pair.

            This object, together with the associated
            entLogicalContextName object, defines the context associated
            with a particular logical entity, and allows access to SNMP
            engines identified by a contextEngineId and contextName
            pair.

            If no value has been configured by the agent, a zero-length
            string is returned, or the agent may choose not to
            instantiate this object at all."
    ::= { entLogicalEntry 7 }

entLogicalContextName    OBJECT-TYPE
    SYNTAX      SnmpAdminString
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "The contextName that can be used to send an SNMP message
            concerning information held by this logical entity, to the
            address specified by the associated
            'entLogicalTAddress/entLogicalTDomain' pair.

            This object, together with the associated
            entLogicalContextEngineID object, defines the context
            associated with a particular logical entity, and allows

            access to SNMP engines identified by a contextEngineId and
            contextName pair.

            If no value has been configured by the agent, a zero-length
            string is returned, or the agent may choose not to
            instantiate this object at all."
    ::= { entLogicalEntry 8 }

entLPMappingTable OBJECT-TYPE
    SYNTAX      SEQUENCE OF EntLPMappingEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
            "This table contains zero or more rows of logical entity to
            physical equipment associations. For each logical entity
            known by this agent, there are zero or more mappings to the
            physical resources which are used to realize that logical
            entity.

            An agent should limit the number and nature of entries in
            this table such that only meaningful and non-redundant
            information is returned. For example, in a system which
            contains a single power supply, mappings between logical
            entities and the power supply are not useful and should not
            be included.

            Also, only the most appropriate physical component which is
            closest to the root of a particular containment tree should
            be identified in an entLPMapping entry.

            For example, suppose a bridge is realized on a particular
            module, and all ports on that module are ports on this
            bridge. A mapping between the bridge and the module would be
            useful, but additional mappings between the bridge and each
            of the ports on that module would be redundant (since the
            entPhysicalContainedIn hierarchy can provide the same
            information). If, on the other hand, more than one bridge
            was utilizing ports on this module, then mappings between
            each bridge and the ports it used would be appropriate.

            Also, in the case of a single backplane repeater, a mapping
            for the backplane to the single repeater entity is not
            necessary."
    ::= { entityMapping 1 }

entLPMappingEntry       OBJECT-TYPE
    SYNTAX      EntLPMappingEntry
    MAX-ACCESS  not-accessible

    STATUS      current
    DESCRIPTION
            "Information about a particular logical entity to physical
            equipment association. Note that the nature of the
            association is not specifically identified in this entry.
            It is expected that sufficient information exists in the
            MIBs used to manage a particular logical entity to infer how
            physical component information is utilized."
    INDEX       { entLogicalIndex, entLPPhysicalIndex }
    ::= { entLPMappingTable 1 }

EntLPMappingEntry ::= SEQUENCE {
      entLPPhysicalIndex         PhysicalIndex
}

entLPPhysicalIndex OBJECT-TYPE
    SYNTAX      PhysicalIndex
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "The value of this object identifies the index value of a
            particular entPhysicalEntry associated with the indicated
            entLogicalEntity."
    ::= { entLPMappingEntry 1 }

-- logical entity/component to alias table
entAliasMappingTable OBJECT-TYPE
    SYNTAX      SEQUENCE OF EntAliasMappingEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
            "This table contains zero or more rows, representing
            mappings of logical entity and physical component to
            external MIB identifiers.  Each physical port in the system
            may be associated with a mapping to an external identifier,
            which itself is associated with a particular logical
            entity's naming scope.  A 'wildcard' mechanism is provided
            to indicate that an identifier is associated with more than
            one logical entity."
    ::= { entityMapping 2 }

entAliasMappingEntry       OBJECT-TYPE
    SYNTAX      EntAliasMappingEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
            "Information about a particular physical equipment, logical
            entity to external identifier binding. Each logical

            entity/physical component pair may be associated with one
            alias mapping.  The logical entity index may also be used as
            a 'wildcard' (refer to the entAliasLogicalIndexOrZero object
            DESCRIPTION clause for details.)

            Note that only entPhysicalIndex values which represent
            physical ports (i.e. associated entPhysicalClass value is
            'port(10)') are permitted to exist in this table."
    INDEX { entPhysicalIndex, entAliasLogicalIndexOrZero }
    ::= { entAliasMappingTable 1 }

EntAliasMappingEntry ::= SEQUENCE {
      entAliasLogicalIndexOrZero        INTEGER,
      entAliasMappingIdentifier          RowPointer
}

entAliasLogicalIndexOrZero OBJECT-TYPE
    SYNTAX      INTEGER (0..2147483647)
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
            "The value of this object identifies the logical entity
            which defines the naming scope for the associated instance
            of the 'entAliasMappingIdentifier' object.

            If this object has a non-zero value, then it identifies the
            logical entity named by the same value of entLogicalIndex.

            If this object has a value of zero, then the mapping between
            the physical component and the alias identifier for this
            entAliasMapping entry is associated with all unspecified
            logical entities. That is, a value of zero (the default
            mapping) identifies any logical entity which does not have
            an explicit entry in this table for a particular
            entPhysicalIndex/entAliasMappingIdentifier pair.

            For example, to indicate that a particular interface (e.g.,
            physical component 33) is identified by the same value of
            ifIndex for all logical entities, the following instance
            might exist:

                    entAliasMappingIdentifier.33.0 = ifIndex.5

            In the event an entPhysicalEntry is associated differently
            for some logical entities, additional entAliasMapping
            entries may exist, e.g.:

                    entAliasMappingIdentifier.33.0 = ifIndex.6

                    entAliasMappingIdentifier.33.4 =  ifIndex.1
                    entAliasMappingIdentifier.33.5 =  ifIndex.1
                    entAliasMappingIdentifier.33.10 = ifIndex.12

            Note that entries with non-zero entAliasLogicalIndexOrZero
            index values have precedence over any zero-indexed entry. In
            this example, all logical entities except 4, 5, and 10,
            associate physical entity 33 with ifIndex.6."
    ::= { entAliasMappingEntry 1 }

entAliasMappingIdentifier OBJECT-TYPE
    SYNTAX      RowPointer
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "The value of this object identifies a particular conceptual
            row associated with the indicated entPhysicalIndex and
            entLogicalIndex pair.

            Since only physical ports are modeled in this table, only
            entries which represent interfaces or ports are allowed.  If
            an ifEntry exists on behalf of a particular physical port,
            then this object should identify the associated 'ifEntry'.
            For repeater ports, the appropriate row in the
            'rptrPortGroupTable' should be identified instead.

            For example, suppose a physical port was represented by
            entPhysicalEntry.3, entLogicalEntry.15 existed for a
            repeater, and entLogicalEntry.22 existed for a bridge.  Then
            there might be two related instances of
            entAliasMappingIdentifier:
               entAliasMappingIdentifier.3.15 == rptrPortGroupIndex.5.2
               entAliasMappingIdentifier.3.22 == ifIndex.17
            It is possible that other mappings (besides interfaces and
            repeater ports) may be defined in the future, as required.

            Bridge ports are identified by examining the Bridge MIB and
            appropriate ifEntries associated with each 'dot1dBasePort',
            and are thus not represented in this table."
    ::= { entAliasMappingEntry 2 }

-- physical mapping table
entPhysicalContainsTable OBJECT-TYPE
    SYNTAX      SEQUENCE OF EntPhysicalContainsEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
            "A table which exposes the container/'containee'

            relationships between physical entities. This table provides
            all the information found by constructing the virtual
            containment tree for a given entPhysicalTable, but in a more
            direct format.

            In the event a physical entity is contained by more than one
            other physical entity (e.g., double-wide modules), this
            table should include these additional mappings, which cannot
            be represented in the entPhysicalTable virtual containment
            tree."
    ::= { entityMapping 3 }

entPhysicalContainsEntry OBJECT-TYPE
    SYNTAX      EntPhysicalContainsEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
            "A single container/'containee' relationship."
    INDEX       { entPhysicalIndex, entPhysicalChildIndex }
    ::= { entPhysicalContainsTable 1 }

EntPhysicalContainsEntry ::= SEQUENCE {
      entPhysicalChildIndex     PhysicalIndex
}

entPhysicalChildIndex OBJECT-TYPE
    SYNTAX      PhysicalIndex
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "The value of entPhysicalIndex for the contained physical
            entity."
    ::= { entPhysicalContainsEntry 1 }

-- last change time stamp for the whole MIB
entLastChangeTime OBJECT-TYPE
    SYNTAX      TimeStamp
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "The value of sysUpTime at the time a conceptual row is
            created, modified, or deleted in any of these tables:
                    - entPhysicalTable
                    - entLogicalTable
                    - entLPMappingTable
                    - entAliasMappingTable
                    - entPhysicalContainsTable
            "

    ::= { entityGeneral 1 }

-- Entity MIB Trap Definitions
entityMIBTraps      OBJECT IDENTIFIER ::= { entityMIB 2 }
entityMIBTrapPrefix OBJECT IDENTIFIER ::= { entityMIBTraps 0 }

entConfigChange NOTIFICATION-TYPE
    STATUS             current
    DESCRIPTION
            "An entConfigChange notification is generated when the value
            of entLastChangeTime changes. It can be utilized by an NMS
            to trigger logical/physical entity table maintenance polls.

            An agent should not generate more than one entConfigChange
            'notification-event' in a given time interval (five seconds
            is the suggested default).  A 'notification-event' is the
            transmission of a single trap or inform PDU to a list of
            notification destinations.

            If additional configuration changes occur within the
            throttling period, then notification-events for these
            changes should be suppressed by the agent until the current
            throttling period expires.  At the end of a throttling
            period, one notification-event should be generated if any
            configuration changes occurred since the start of the
            throttling period. In such a case, another throttling period
            is started right away.

            An NMS should periodically check the value of
            entLastChangeTime to detect any missed entConfigChange
            notification-events, e.g., due to throttling or transmission
            loss."
   ::= { entityMIBTrapPrefix 1 }

-- conformance information
entityConformance OBJECT IDENTIFIER ::= { entityMIB 3 }

entityCompliances OBJECT IDENTIFIER ::= { entityConformance 1 }
entityGroups      OBJECT IDENTIFIER ::= { entityConformance 2 }

-- compliance statements
entityCompliance MODULE-COMPLIANCE
    STATUS  deprecated
    DESCRIPTION
            "The compliance statement for SNMP entities which implement
            version 1 of the Entity MIB."
    MODULE  -- this module
        MANDATORY-GROUPS {

                           entityPhysicalGroup,
                           entityLogicalGroup,
                           entityMappingGroup,
                           entityGeneralGroup,
                           entityNotificationsGroup
        }
    ::= { entityCompliances 1 }

entity2Compliance MODULE-COMPLIANCE
    STATUS  current
    DESCRIPTION
            "The compliance statement for SNMP entities which implement
            version 2 of the Entity MIB."
    MODULE  -- this module
        MANDATORY-GROUPS {
                           entityPhysicalGroup,
                           entityPhysical2Group,
                           entityGeneralGroup,
                           entityNotificationsGroup
        }
        GROUP entityLogical2Group
        DESCRIPTION
            "Implementation of this group is not mandatory for agents
            which model all MIB object instances within a single naming
            scope."

        GROUP entityMappingGroup
        DESCRIPTION
            "Implementation of the entPhysicalContainsTable is mandatory
            for all agents.  Implementation of the entLPMappingTable and
            entAliasMappingTables are not mandatory for agents which
            model all MIB object instances within a single naming scope.

            Note that the entAliasMappingTable may be useful for all
            agents, however implementation of the entityLogicalGroup or
            entityLogical2Group is required to support this table."

        OBJECT entPhysicalSerialNum
        MIN-ACCESS   not-accessible
        DESCRIPTION
            "Read and write access is not required for agents which
            cannot identify serial number information for physical
            entities, and/or cannot provide non-volatile storage for
            NMS-assigned serial numbers.

            Write access is not required for agents which can identify
            serial number information for physical entities, but cannot
            provide non-volatile storage for NMS-assigned serial

            numbers.

            Write access is not required for physical entities for
            physical entities for which the associated value of the
            entPhysicalIsFRU object is equal to 'false(2)'."

        OBJECT entPhysicalAlias
        MIN-ACCESS   read-only
        DESCRIPTION
            "Write access is required only if the associated
            entPhysicalClass value is equal to 'chassis(3)'."

        OBJECT entPhysicalAssetID
        MIN-ACCESS   not-accessible
        DESCRIPTION
            "Read and write access is not required for agents which
            cannot provide non-volatile storage for NMS-assigned asset
            identifiers.

            Write access is not required for physical entities for which
            the associated value of entPhysicalIsFRU is equal to
            'false(2)'."
    ::= { entityCompliances 2 }

-- MIB groupings
entityPhysicalGroup    OBJECT-GROUP
    OBJECTS {
              entPhysicalDescr,
              entPhysicalVendorType,
              entPhysicalContainedIn,
              entPhysicalClass,
              entPhysicalParentRelPos,
              entPhysicalName
            }
    STATUS  current
    DESCRIPTION
            "The collection of objects which are used to represent
            physical system components, for which a single agent
            provides management information."
    ::= { entityGroups 1 }

entityLogicalGroup    OBJECT-GROUP
    OBJECTS {
              entLogicalDescr,
              entLogicalType,
              entLogicalCommunity,
              entLogicalTAddress,
              entLogicalTDomain

            }
    STATUS  deprecated
    DESCRIPTION
            "The collection of objects which are used to represent the
            list of logical entities for which a single agent provides
            management information."
    ::= { entityGroups 2 }

entityMappingGroup    OBJECT-GROUP
    OBJECTS {
              entLPPhysicalIndex,
              entAliasMappingIdentifier,
              entPhysicalChildIndex
            }
    STATUS  current
    DESCRIPTION
            "The collection of objects which are used to represent the
            associations between multiple logical entities, physical
            components, interfaces, and port identifiers for which a
            single agent provides management information."
    ::= { entityGroups 3 }

entityGeneralGroup    OBJECT-GROUP
    OBJECTS {
              entLastChangeTime
            }
    STATUS  current
    DESCRIPTION
            "The collection of objects which are used to represent
            general entity information for which a single agent provides
            management information."
    ::= { entityGroups 4 }

entityNotificationsGroup NOTIFICATION-GROUP
    NOTIFICATIONS { entConfigChange }
    STATUS        current
    DESCRIPTION
            "The collection of notifications used to indicate Entity MIB
            data consistency and general status information."
    ::= { entityGroups 5 }

entityPhysical2Group    OBJECT-GROUP
    OBJECTS {
              entPhysicalHardwareRev,
              entPhysicalFirmwareRev,
              entPhysicalSoftwareRev,
              entPhysicalSerialNum,
              entPhysicalMfgName,

              entPhysicalModelName,
              entPhysicalAlias,
              entPhysicalAssetID,
              entPhysicalIsFRU
            }

    STATUS  current
    DESCRIPTION
            "The collection of objects which are used to represent
            physical system components, for which a single agent
            provides management information.  This group augments the
            objects contained in the entityPhysicalGroup."
    ::= { entityGroups 6 }

entityLogical2Group    OBJECT-GROUP
    OBJECTS {
              entLogicalDescr,
              entLogicalType,
              entLogicalTAddress,
              entLogicalTDomain,
              entLogicalContextEngineID,
              entLogicalContextName
            }
    STATUS  current
    DESCRIPTION
            "The collection of objects which are used to represent the
            list of logical entities for which a single SNMP entity
            provides management information."
    ::= { entityGroups 7 }

END

4.  Usage Examples

   The following sections iterate the instance values for two example
   networking devices. These examples are kept simple to make them more
   understandable. Auxiliary components, such as fans, sensors, empty
   slots, and sub-modules are not shown, but might be modeled in real
   implementations.

4.1.  Router/Bridge

   A router containing two slots.  Each slot contains a 3 port
   router/bridge module. Each port is represented in the ifTable.  There
   are two logical instances of OSPF running and two logical bridges:

   Physical entities -- entPhysicalTable:
     1 Field-replaceable physical chassis:

       entPhysicalDescr.1 ==             'Acme Chassis Model 100'
       entPhysicalVendorType.1 ==        acmeProducts.chassisTypes.1
       entPhysicalContainedIn.1 ==       0
       entPhysicalClass.1 ==             chassis(3)
       entPhysicalParentRelPos.1 ==      0
       entPhysicalName.1 ==              '100-A'
       entPhysicalHardwareRev.1 ==       'A(1.00.02)'
       entPhysicalSoftwareRev.1 ==       ''
       entPhysicalFirmwareRev.1 ==       ''
       entPhysicalSerialNum.1 ==         'C100076544'
       entPhysicalMfgName.1 ==           'Acme'
       entPhysicalModelName.1 ==         '100'
       entPhysicalAlias.1 ==             'cl-SJ17-3-006:rack1:rtr-U3'
       entPhysicalAssetID.1 ==           '0007372293'
       entPhysicalIsFRU.1 ==             true(1)

     2 slots within the chassis:
       entPhysicalDescr.2 ==             'Acme Chassis Slot Type AA'
       entPhysicalVendorType.2  ==       acmeProducts.slotTypes.1
       entPhysicalContainedIn.2 ==       1
       entPhysicalClass.2 ==             container(5)
       entPhysicalParentRelPos.2 ==      1
       entPhysicalName.2 ==              'S1'
       entPhysicalHardwareRev.2 ==       'B(1.00.01)'
       entPhysicalSoftwareRev.2 ==       ''
       entPhysicalFirmwareRev.2 ==       ''
       entPhysicalSerialNum.2 ==         ''
       entPhysicalMfgName.2 ==           'Acme'
       entPhysicalModelName.2 ==         'AA'
       entPhysicalAlias.2 ==             ''
       entPhysicalAssetID.2 ==           ''
       entPhysicalIsFRU.2 ==             false(2)

       entPhysicalDescr.3 ==             'Acme Chassis Slot Type AA'
       entPhysicalVendorType.3 =         acmeProducts.slotTypes.1
       entPhysicalContainedIn.3 ==       1
       entPhysicalClass.3 ==             container(5)
       entPhysicalParentRelPos.3 ==      2
       entPhysicalName.3 ==              'S2'
       entPhysicalHardwareRev.3 ==       '1.00.07'
       entPhysicalSoftwareRev.3 ==       ''
       entPhysicalFirmwareRev.3 ==       ''
       entPhysicalSerialNum.3 ==         ''
       entPhysicalMfgName.3 ==           'Acme'
       entPhysicalModelName.3 ==         'AA'
       entPhysicalAlias.3 ==             ''
       entPhysicalAssetID.3 ==           ''
       entPhysicalIsFRU.3 ==             false(2)

     2 Field-replaceable modules:
     Slot 1 contains a module with 3 ports:
       entPhysicalDescr.4 ==             'Acme Router-100'
       entPhysicalVendorType.4  ==       acmeProducts.moduleTypes.14
       entPhysicalContainedIn.4 ==       2
       entPhysicalClass.4 ==             module(9)
       entPhysicalParentRelPos.4 ==      1
       entPhysicalName.4 ==              'M1'
       entPhysicalHardwareRev.4 ==       '1.00.07'
       entPhysicalSoftwareRev.4 ==       '1.4.1'
       entPhysicalFirmwareRev.4 ==       'A(1.1)'
       entPhysicalSerialNum.4 ==         'C100087363'
       entPhysicalMfgName.4 ==           'Acme'
       entPhysicalModelName.4 ==         'R100-FE'
       entPhysicalAlias.4 ==             'rtr-U3:m1:SJ17-3-eng'
       entPhysicalAssetID.4 ==           '0007372462'
       entPhysicalIsFRU.4 ==             true(1)

       entPhysicalDescr.5 ==             'Acme Ethernet-100 Port'
       entPhysicalVendorType.5  ==       acmeProducts.portTypes.2
       entPhysicalContainedIn.5 ==       4
       entPhysicalClass.5 ==             port(10)
       entPhysicalParentRelPos.5 ==      1
       entPhysicalName.5 ==              'P1'
       entPhysicalHardwareRev.5 ==       'G(1.02)'
       entPhysicalSoftwareRev.5 ==       ''
       entPhysicalFirmwareRev.5 ==       '1.1'
       entPhysicalSerialNum.5 ==         ''
       entPhysicalMfgName.5 ==           'Acme'
       entPhysicalModelName.5 ==         'FE-100'
       entPhysicalAlias.5 ==             ''
       entPhysicalAssetID.5 ==           ''
       entPhysicalIsFRU.5 ==             false(2)

       entPhysicalDescr.6 ==             'Acme Ethernet-100 Port'
       entPhysicalVendorType.6  ==       acmeProducts.portTypes.2
       entPhysicalContainedIn.6 ==       4
       entPhysicalClass.6 ==             port(10)
       entPhysicalParentRelPos.6 ==      2
       entPhysicalName.6 ==              'P2'
       entPhysicalHardwareRev.6 ==       'G(1.02)'
       entPhysicalSoftwareRev.6 ==       ''
       entPhysicalFirmwareRev.6 ==       '1.1'
       entPhysicalSerialNum.6 ==         ''
       entPhysicalMfgName.6 ==           'Acme'
       entPhysicalModelName.6 ==         'FE-100'
       entPhysicalAlias.6 ==             ''
       entPhysicalAssetID.6 ==           ''

       entPhysicalIsFRU.6 ==             false(2)

       entPhysicalDescr.7 ==             'Acme Router-100 FDDI-Port'
       entPhysicalVendorType.7  ==       acmeProducts.portTypes.3
       entPhysicalContainedIn.7 ==       4
       entPhysicalClass.7 ==             port(10)
       entPhysicalParentRelPos.7 ==      3
       entPhysicalName.7 ==              'P3'
       entPhysicalHardwareRev.7 ==       'B(1.03)'
       entPhysicalSoftwareRev.7 ==       '2.5.1'
       entPhysicalFirmwareRev.7 ==       '2.5F'
       entPhysicalSerialNum.7 ==         ''
       entPhysicalMfgName.7 ==           'Acme'
       entPhysicalModelName.7 ==         'FDDI-100'
       entPhysicalAlias.7 ==             ''
       entPhysicalAssetID.7 ==           ''
       entPhysicalIsFRU.7 ==             false(2)

     Slot 2 contains another 3-port module:
       entPhysicalDescr.8 ==             'Acme Router-100 Comm Module'
       entPhysicalVendorType.8  ==       acmeProducts.moduleTypes.15
       entPhysicalContainedIn.8 ==       3
       entPhysicalClass.8 ==             module(9)
       entPhysicalParentRelPos.8 ==      1
       entPhysicalName.8 ==              'M2'
       entPhysicalHardwareRev.8 ==       '2.01.00'
       entPhysicalSoftwareRev.8 ==       '3.0.7'
       entPhysicalFirmwareRev.8 ==       'A(1.2)'
       entPhysicalSerialNum.8 ==         'C100098732'
       entPhysicalMfgName.8 ==           'Acme'
       entPhysicalModelName.8 ==         'C100'
       entPhysicalAlias.8 ==             'rtr-U3:m2:SJ17-2-eng'
       entPhysicalAssetID.8 ==           '0007373982'
       entPhysicalIsFRU.8 ==             true(1)

       entPhysicalDescr.9 ==             'Acme Fddi-100 Port'
       entPhysicalVendorType.9 ==        acmeProducts.portTypes.5
       entPhysicalContainedIn.9 ==       8
       entPhysicalClass.9 ==             port(10)
       entPhysicalParentRelPos.9 ==      1
       entPhysicalName.9 ==              'FDDI Primary'
       entPhysicalHardwareRev.9 ==       'CC(1.07)'
       entPhysicalSoftwareRev.9 ==       '2.0.34'
       entPhysicalFirmwareRev.9 ==       '1.1'
       entPhysicalSerialNum.9 ==         ''
       entPhysicalMfgName.9 ==           'Acme'
       entPhysicalModelName.9 ==         'FDDI-100'
       entPhysicalAlias.9 ==             ''

       entPhysicalAssetID.9 ==           ''
       entPhysicalIsFRU.9 ==             false(2)

       entPhysicalDescr.10 ==            'Acme Ethernet-100 Port'
       entPhysicalVendorType.10 ==       acmeProducts.portTypes.2
       entPhysicalContainedIn.10 ==      8
       entPhysicalClass.10 ==            port(10)
       entPhysicalParentRelPos.10 ==     2
       entPhysicalName.10 ==             'Ethernet A'
       entPhysicalHardwareRev.10 ==      'G(1.04)'
       entPhysicalSoftwareRev.10 ==      ''
       entPhysicalFirmwareRev.10 ==      '1.3'
       entPhysicalSerialNum.10 ==        ''
       entPhysicalMfgName.10 ==          'Acme'
       entPhysicalModelName.10 ==        'FE-100'
       entPhysicalAlias.10 ==            ''
       entPhysicalAssetID.10 ==          ''
       entPhysicalIsFRU.10 ==            false(2)
       entPhysicalDescr.11 ==            'Acme Ethernet-100 Port'
       entPhysicalVendorType.11 ==       acmeProducts.portTypes.2
       entPhysicalContainedIn.11 ==      8
       entPhysicalClass.11 ==            port(10)
       entPhysicalParentRelPos.11 ==     3
       entPhysicalName.11 ==             'Ethernet B'
       entPhysicalHardwareRev.11 ==      'G(1.04)'
       entPhysicalSoftwareRev.11 ==      ''
       entPhysicalFirmwareRev.11 ==      '1.3'
       entPhysicalSerialNum.11 ==        ''
       entPhysicalMfgName.11 ==          'Acme'
       entPhysicalModelName.11 ==        'FE-100'
       entPhysicalAlias.11 ==            ''
       entPhysicalAssetID.11 ==          ''
       entPhysicalIsFRU.11 ==            false(2)

   Logical entities -- entLogicalTable; no SNMPv3 support
     2 OSPF instances:
       entLogicalDescr.1 ==              'Acme OSPF v1.1'
       entLogicalType.1 ==               ospf
       entLogicalCommunity.1 ==          'public-ospf1'
       entLogicalTAddress.1 ==           124.125.126.127:161
       entLogicalTDomain.1 ==            snmpUDPDomain
       entLogicalContextEngineID.1 ==    ''
       entLogicalContextName.1 ==        ''

       entLogicalDescr.2 ==              'Acme OSPF v1.1'
       entLogicalType.2 ==               ospf
       entLogicalCommunity.2 ==          'public-ospf2'
       entLogicalTAddress.2 ==           124.125.126.127:161

       entLogicalTDomain.2 ==            snmpUDPDomain
       entLogicalContextEngineID.2 ==    ''
       entLogicalContextName.2 ==        ''

     2 logical bridges:
       entLogicalDescr.3 ==              'Acme Bridge v2.1.1'
       entLogicalType.3  ==              dot1dBridge
       entLogicalCommunity.3 ==          'public-bridge1'
       entLogicalTAddress.3 ==           124.125.126.127:161
       entLogicalTDomain.3 ==            snmpUDPDomain
       entLogicalContextEngineID.3 ==    ''
       entLogicalContextName.3 ==        ''

       entLogicalDescr.4 ==              'Acme Bridge v2.1.1'
       entLogicalType.4 ==               dot1dBridge
       entLogicalCommunity.4 ==          'public-bridge2'
       entLogicalTAddress.4 ==           124.125.126.127:161
       entLogicalTDomain.4 ==            snmpUDPDomain
       entLogicalContextEngineID.4 ==    ''
       entLogicalContextName.4 ==        ''

   Logical to Physical Mappings:
     1st OSPF instance: uses module 1-port 1
         entLPPhysicalIndex.1.5 ==         5

     2nd OSPF instance: uses module 2-port 1
         entLPPhysicalIndex.2.9 ==         9

     1st bridge group: uses module 1, all ports

     [ed. -- Note that these mappings are included in the table since
     another logical entity (1st OSPF) utilizes one of the
     ports. If this were not the case, then a single mapping
     to the module (e.g., entLPPhysicalIndex.3.4) would be
     present instead. ]
         entLPPhysicalIndex.3.5 ==         5
         entLPPhysicalIndex.3.6 ==         6
         entLPPhysicalIndex.3.7 ==         7

     2nd bridge group: uses module 2, all ports
         entLPPhysicalIndex.4.9  ==        9
         entLPPhysicalIndex.4.10 ==        10
         entLPPhysicalIndex.4.11 ==        11

   Physical to Logical to MIB Alias Mappings -- entAliasMappingTable:
     Example 1: ifIndex values are global to all logical entities
         entAliasMappingIdentifier.5.0 ==  ifIndex.1
         entAliasMappingIdentifier.6.0 ==  ifIndex.2

         entAliasMappingIdentifier.7.0 ==  ifIndex.3
         entAliasMappingIdentifier.9.0 ==  ifIndex.4
         entAliasMappingIdentifier.10.0 == ifIndex.5
         entAliasMappingIdentifier.11.0 == ifIndex.6

     Example 2: ifIndex values are not shared by all logical entities
         entAliasMappingIdentifier.5.0 ==  ifIndex.1
         entAliasMappingIdentifier.5.3 ==  ifIndex.101
         entAliasMappingIdentifier.6.0 ==  ifIndex.2
         entAliasMappingIdentifier.6.3 ==  ifIndex.102
         entAliasMappingIdentifier.7.0 ==  ifIndex.3
         entAliasMappingIdentifier.7.3 ==  ifIndex.103
         entAliasMappingIdentifier.9.0 ==  ifIndex.4
         entAliasMappingIdentifier.9.3 ==  ifIndex.204
         entAliasMappingIdentifier.10.0 == ifIndex.5
         entAliasMappingIdentifier.10.3 == ifIndex.205
         entAliasMappingIdentifier.11.0 == ifIndex.6
         entAliasMappingIdentifier.11.3 == ifIndex.206

   Physical Containment Tree -- entPhysicalContainsTable
     chassis has two containers:
         entPhysicalChildIndex.1.2 ==      2
         entPhysicalChildIndex.1.3 ==      3

     container 1 has a module:
         entPhysicalChildIndex.2.4 ==      4

     container 2 has a module:
         entPhysicalChildIndex.3.8 ==      8

     module 1 has 3 ports:
         entPhysicalChildIndex.4.5 ==      5
         entPhysicalChildIndex.4.6 ==      6
         entPhysicalChildIndex.4.7 ==      7

     module 2 has 3 ports:
         entPhysicalChildIndex.8.9 ==      9
         entPhysicalChildIndex.8.10 ==     10
         entPhysicalChildIndex.1.11 ==     11

4.2.  Repeaters

   A 3-slot Hub with 2 backplane ethernet segments.  Slot three is
   empty, and the remaining slots contain ethernet repeater modules.

   Note that this example assumes an older Repeater MIB implementation,
   (RFC 1516 [RFC1516]) rather than the new Repeater MIB (RFC 2108
   [RFC2108]).  The new version contains an object called '

   rptrPortRptrId', which should be used to identify repeater port
   groupings, rather than with community strings or contexts.

Physical entities -- entPhysicalTable:
   1 Field-replaceable physical chassis:
      entPhysicalDescr.1 ==          'Acme Chassis Model 110'
      entPhysicalVendorType.1 ==     acmeProducts.chassisTypes.2
      entPhysicalContainedIn.1 ==    0
      entPhysicalClass.1 ==          chassis(3)
      entPhysicalParentRelPos.1 ==   0
      entPhysicalName.1 ==           '110-B'
      entPhysicalHardwareRev.1 ==    'A(1.02.00)'
      entPhysicalSoftwareRev.1 ==    ''
      entPhysicalFirmwareRev.1 ==    ''
      entPhysicalSerialNum.1 ==      'C100079294'
      entPhysicalMfgName.1 ==        'Acme'
      entPhysicalModelName.1 ==      '110'
      entPhysicalAlias.1 ==          'bldg09:floor1:rptr18:0067eea0229f'
      entPhysicalAssetID.1 ==        '0007386327'
      entPhysicalIsFRU.1 ==          true(1)

   2 Chassis Ethernet Backplanes:
      entPhysicalDescr.2 ==          'Acme Ethernet Backplane Type A'
      entPhysicalVendorType.2 ==     acmeProducts.backplaneTypes.1
      entPhysicalContainedIn.2 ==    1
      entPhysicalClass.2 ==          backplane(4)
      entPhysicalParentRelPos.2 ==   1
      entPhysicalName.2 ==           'B1'
      entPhysicalHardwareRev.2 ==    'A(2.04.01)'
      entPhysicalSoftwareRev.2 ==    ''
      entPhysicalFirmwareRev.2 ==    ''
      entPhysicalSerialNum.2 ==      ''
      entPhysicalMfgName.2 ==        'Acme'
      entPhysicalModelName.2 ==      'BK-A'
      entPhysicalAlias.2 ==          ''
      entPhysicalAssetID.2 ==        ''
      entPhysicalIsFRU.2 ==          false(2)

      entPhysicalDescr.3 ==          'Acme Ethernet Backplane Type A'
      entPhysicalVendorType.3  ==    acmeProducts.backplaneTypes.1
      entPhysicalContainedIn.3 ==    1
      entPhysicalClass.3 ==          backplane(4)
      entPhysicalParentRelPos.3 ==   2
      entPhysicalName.3 ==           'B2'
      entPhysicalHardwareRev.3 ==    'A(2.04.01)'
      entPhysicalSoftwareRev.3 ==    ''
      entPhysicalFirmwareRev.3 ==    ''
      entPhysicalSerialNum.3 ==      ''

      entPhysicalMfgName.3 ==        'Acme'
      entPhysicalModelName.3 ==      'BK-A'
      entPhysicalAlias.3 ==          ''
      entPhysicalAssetID.3 ==        ''
      entPhysicalIsFRU.3 ==          false(2)

   3 slots within the chassis:
      entPhysicalDescr.4 ==          'Acme Hub Slot Type RB'
      entPhysicalVendorType.4  ==    acmeProducts.slotTypes.5
      entPhysicalContainedIn.4 ==    1
      entPhysicalClass.4 ==          container(5)
      entPhysicalParentRelPos.4 ==   1
      entPhysicalName.4 ==           'Slot 1'
      entPhysicalHardwareRev.4 ==    'B(1.00.03)'
      entPhysicalSoftwareRev.4 ==    ''
      entPhysicalFirmwareRev.4 ==    ''
      entPhysicalSerialNum.4 ==      ''
      entPhysicalMfgName.4 ==        'Acme'
      entPhysicalModelName.4 ==      'RB'
      entPhysicalAlias.4 ==          ''
      entPhysicalAssetID.4 ==        ''
      entPhysicalIsFRU.4 ==          false(2)

      entPhysicalDescr.5 ==          'Acme Hub Slot Type RB'
      entPhysicalVendorType.5  ==    acmeProducts.slotTypes.5
      entPhysicalContainedIn.5 ==    1
      entPhysicalClass.5 ==          container(5)
      entPhysicalParentRelPos.5 ==   2
      entPhysicalName.5 ==           'Slot 2'
      entPhysicalHardwareRev.5 ==    'B(1.00.03)'
      entPhysicalSoftwareRev.5 ==    ''
      entPhysicalFirmwareRev.5 ==    ''
      entPhysicalSerialNum.5 ==      ''
      entPhysicalMfgName.5 ==        'Acme'
      entPhysicalModelName.5 ==      'RB'
      entPhysicalAlias.5 ==          ''
      entPhysicalAssetID.5 ==        ''
      entPhysicalIsFRU.5 ==          false(2)

      entPhysicalDescr.6 ==          'Acme Hub Slot Type RB'
      entPhysicalVendorType.6  ==    acmeProducts.slotTypes.5
      entPhysicalContainedIn.6 ==    1
      entPhysicalClass.6 ==          container(5)
      entPhysicalParentRelPos.6 ==   3
      entPhysicalName.6 ==           'Slot 3'
      entPhysicalHardwareRev.6 ==    'B(1.00.03)'
      entPhysicalSoftwareRev.6 ==    ''
      entPhysicalFirmwareRev.6 ==    ''

      entPhysicalSerialNum.6 ==      ''
      entPhysicalMfgName.6 ==        'Acme'
      entPhysicalModelName.6 ==      'RB'
      entPhysicalAlias.6 ==          ''
      entPhysicalAssetID.6 ==        ''
      entPhysicalIsFRU.6 ==          false(2)

   Slot 1 contains a plug-in module with 4 10-BaseT ports:
      entPhysicalDescr.7  ==         'Acme 10Base-T Module 114'
      entPhysicalVendorType.7 ==     acmeProducts.moduleTypes.32
      entPhysicalContainedIn.7  ==   4
      entPhysicalClass.7 ==          module(9)
      entPhysicalParentRelPos.7 ==   1
      entPhysicalName.7 ==           'M1'
      entPhysicalHardwareRev.7 ==    'A(1.02.01)'
      entPhysicalSoftwareRev.7 ==    '1.7.2'
      entPhysicalFirmwareRev.7 ==    'A(1.5)'
      entPhysicalSerialNum.7 ==      'C100096244'
      entPhysicalMfgName.7 ==        'Acme'
      entPhysicalModelName.7 =       '114'
      entPhysicalAlias.7 ==          'bldg09:floor1:eng'
      entPhysicalAssetID.7 ==        '0007962951'
      entPhysicalIsFRU.7 ==          true(1)

      entPhysicalDescr.8 ==          'Acme 10Base-T Port RB'
      entPhysicalVendorType.8 ==     acmeProducts.portTypes.10
      entPhysicalContainedIn.8  ==   7
      entPhysicalClass.8 ==          port(10)
      entPhysicalParentRelPos.8 ==   1
      entPhysicalName.8 ==           'Ethernet-A'
      entPhysicalHardwareRev.8 ==    'A(1.04F)'
      entPhysicalSoftwareRev.8 ==    ''
      entPhysicalFirmwareRev.8 ==    '1.4'
      entPhysicalSerialNum.8 ==      ''
      entPhysicalMfgName.8 ==        'Acme'
      entPhysicalModelName.8 ==      'RB'
      entPhysicalAlias.8 ==          ''
      entPhysicalAssetID.8 ==        ''
      entPhysicalIsFRU.8 ==          false(2)

      entPhysicalDescr.9  ==         'Acme 10Base-T Port RB'
      entPhysicalVendorType.9 ==     acmeProducts.portTypes.10
      entPhysicalContainedIn.9 ==    7
      entPhysicalClass.9 ==          port(10)
      entPhysicalParentRelPos.9 ==   2
      entPhysicalName.9 ==           'Ethernet-B'
      entPhysicalHardwareRev.9 ==    'A(1.04F)'
      entPhysicalSoftwareRev.9 ==    ''

      entPhysicalFirmwareRev.9 ==    '1.4'
      entPhysicalSerialNum.9 ==      ''
      entPhysicalMfgName.9 ==        'Acme'
      entPhysicalModelName.9 =       'RB'
      entPhysicalAlias.9 ==          ''
      entPhysicalAssetID.9 ==        ''
      entPhysicalIsFRU.9 ==          false(2)

      entPhysicalDescr.10 ==         'Acme 10Base-T Port RB'
      entPhysicalVendorType.10 ==    acmeProducts.portTypes.10
      entPhysicalContainedIn.10 ==   7
      entPhysicalClass.10 ==         port(10)
      entPhysicalParentRelPos.10 ==  3
      entPhysicalName.10 ==          'Ethernet-C'
      entPhysicalHardwareRev.10 ==   'B(1.02.07)'
      entPhysicalSoftwareRev.10 ==   ''
      entPhysicalFirmwareRev.10 ==   '1.4'
      entPhysicalSerialNum.10 ==     ''
      entPhysicalMfgName.10 ==       'Acme'
      entPhysicalModelName.10 ==     'RB'
      entPhysicalAlias.10 ==         ''
      entPhysicalAssetID.10 ==       ''
      entPhysicalIsFRU.10 ==         false(2)

      entPhysicalDescr.11 ==         'Acme 10Base-T Port RB'
      entPhysicalVendorType.11  ==   acmeProducts.portTypes.10
      entPhysicalContainedIn.11 ==   7
      entPhysicalClass.11 ==         port(10)
      entPhysicalParentRelPos.11 ==  4
      entPhysicalName.11 ==          'Ethernet-D'
      entPhysicalHardwareRev.11 ==   'B(1.02.07)'
      entPhysicalSoftwareRev.11 ==   ''
      entPhysicalFirmwareRev.11 ==   '1.4'
      entPhysicalSerialNum.11 ==     ''
      entPhysicalMfgName.11 ==       'Acme'
      entPhysicalModelName.11 ==     'RB'
      entPhysicalAlias.11 ==         ''
      entPhysicalAssetID.11 ==       ''
      entPhysicalIsFRU.11 ==         false(2)

   Slot 2 contains another ethernet module with 2 ports.
      entPhysicalDescr.12 ==         'Acme 10Base-T Module Model 4'
      entPhysicalVendorType.12 ==    acmeProducts.moduleTypes.30
      entPhysicalContainedIn.12 =    5
      entPhysicalClass.12 ==         module(9)
      entPhysicalParentRelPos.12 ==  1
      entPhysicalName.12 ==          'M2'
      entPhysicalHardwareRev.12 ==   'A(1.01.07)'

      entPhysicalSoftwareRev.12 ==   '1.8.4'
      entPhysicalFirmwareRev.12 ==   'A(1.8)'
      entPhysicalSerialNum.12 ==     'C100102384'
      entPhysicalMfgName.12 ==       'Acme'
      entPhysicalModelName.12 ==     '4'
      entPhysicalAlias.12 ==         'bldg09:floor1:devtest'
      entPhysicalAssetID.12 ==       '0007968462'
      entPhysicalIsFRU.12 ==         true(1)

      entPhysicalDescr.13 ==         'Acme 802.3 AUI Port'
      entPhysicalVendorType.13  ==   acmeProducts.portTypes.11
      entPhysicalContainedIn.13 ==   12
      entPhysicalClass.13 ==         port(10)
      entPhysicalParentRelPos.13 ==  1
      entPhysicalName.13 ==          'AUI'
      entPhysicalHardwareRev.13 ==   'A(1.06F)'
      entPhysicalSoftwareRev.13 ==   ''
      entPhysicalFirmwareRev.13 ==   '1.5'
      entPhysicalSerialNum.13 ==     ''
      entPhysicalMfgName.13 ==       'Acme'
      entPhysicalModelName.13 ==     ''
      entPhysicalAlias.13 ==         ''
      entPhysicalAssetID.13 ==       ''
      entPhysicalIsFRU.13 ==         false(2)

      entPhysicalDescr.14 ==         'Acme 10Base-T Port RD'
      entPhysicalVendorType.14  ==   acmeProducts.portTypes.14
      entPhysicalContainedIn.14 ==   12
      entPhysicalClass.14 ==         port(10)
      entPhysicalParentRelPos.14 ==  2
      entPhysicalName.14 ==          'E2'
      entPhysicalHardwareRev.14 ==   'B(1.01.02)'
      entPhysicalSoftwareRev.14 ==   ''
      entPhysicalFirmwareRev.14 ==   '2.1'
      entPhysicalSerialNum.14 ==     ''
      entPhysicalMfgName.14 ==       'Acme'
      entPhysicalModelName.14 ==     ''
      entPhysicalAlias.14 ==         ''
      entPhysicalAssetID.14 ==       ''
      entPhysicalIsFRU.14 ==         false(2)

Logical entities -- entLogicalTable; with SNMPv3 support
   Repeater 1--comprised of any ports attached to backplane 1
      entLogicalDescr.1 ==           'Acme repeater v3.1'
      entLogicalType.1  ==           snmpDot3RptrMgt
      entLogicalCommunity.1          'public-repeater1'
      entLogicalTAddress.1 ==        124.125.126.127:161
      entLogicalTDomain.1 ==         snmpUDPDomain

      entLogicalContextEngineID.1 == '80000777017c7d7e7f'H
      entLogicalContextName.1 ==     'repeater1'

   Repeater 2--comprised of any ports attached to backplane 2:
      entLogicalDescr.2 ==           'Acme repeater v3.1'
      entLogicalType.2  ==           snmpDot3RptrMgt
      entLogicalCommunity.2 ==       'public-repeater2'
      entLogicalTAddress.2 ==        124.125.126.127:161
      entLogicalTDomain.2 ==         snmpUDPDomain
      entLogicalContextEngineID.2 == '80000777017c7d7e7f'H
      entLogicalContextName.2 ==     'repeater2'

Logical to Physical Mappings -- entLPMappingTable:

  repeater1 uses backplane 1, slot 1-ports 1 & 2, slot 2-port 1
  [ed. -- Note that a mapping to the module is not included,
   since in this example represents a port-switchable hub.
   Even though all ports on the module could belong to the
   same repeater as a matter of configuration, the LP port
   mappings should not be replaced dynamically with a single
   mapping for the module (e.g., entLPPhysicalIndex.1.7).
   If all ports on the module shared a single backplane connection,
   then a single mapping for the module would be more appropriate. ]

     entLPPhysicalIndex.1.2 ==       2
     entLPPhysicalIndex.1.8 ==       8
     entLPPhysicalIndex.1.9 ==       9
     entLPPhysicalIndex.1.13 ==      13

  repeater2 uses backplane 2, slot 1-ports 3 & 4, slot 2-port 2
      entLPPhysicalIndex.2.3 ==      3
      entLPPhysicalIndex.2.10 ==     10
      entLPPhysicalIndex.2.11 ==     11
      entLPPhysicalIndex.2.14 ==     14

Physical to Logical to MIB Alias Mappings -- entAliasMappingTable:
  Repeater Port Identifier values are shared by both repeaters:
      entAliasMappingIdentifier.8.0 ==      rptrPortGroupIndex.1.1
      entAliasMappingIdentifier.9.0 ==      rptrPortGroupIndex.1.2
      entAliasMappingIdentifier.10.0 ==     rptrPortGroupIndex.1.3
      entAliasMappingIdentifier.11.0 ==     rptrPortGroupIndex.1.4
      entAliasMappingIdentifier.13.0 ==     rptrPortGroupIndex.2.1
      entAliasMappingIdentifier.14.0 ==     rptrPortGroupIndex.2.2

Physical Containment Tree -- entPhysicalContainsTable
  chassis has two backplanes and three containers:
      entPhysicalChildIndex.1.2 ==   2
      entPhysicalChildIndex.1.3 ==   3

      entPhysicalChildIndex.1.4 ==   4
      entPhysicalChildIndex.1.5 ==   5
      entPhysicalChildIndex.1.6 ==   6

  container 1 has a module:
      entPhysicalChildIndex.4.7 ==   7

  container 2 has a module
      entPhysicalChildIndex.5.12 ==  12
  [ed. - in this example, container 3 is empty.]

  module 1 has 4 ports:
      entPhysicalChildIndex.7.8 ==   8
      entPhysicalChildIndex.7.9 ==   9
      entPhysicalChildIndex.7.10 ==  10
      entPhysicalChildIndex.7.11 ==  11

  module 2 has 2 ports:
      entPhysicalChildIndex.12.13 == 13
      entPhysicalChildIndex.12.14 == 14

5.  Intellectual Property

   The IETF takes no position regarding the validity or scope of any
   intellectual property or other rights that might be claimed to
   pertain to the implementation or use of the technology described in
   this document or the extent to which any license under such rights
   might or might not be available; neither does it represent that it
   has made any effort to identify any such rights.  Information on the
   IETF's procedures with respect to rights in standards-track and
   standards-related documentation can be found in BCP-11.  Copies of
   claims of rights made available for publication and any assurances of
   licenses to be made available, or the result of an attempt made to
   obtain a general license or permission for the use of such
   proprietary rights by implementors or users of this specification can
   be obtained from the IETF Secretariat.

   The IETF invites any interested party to bring to its attention any
   copyrights, patents or patent applications, or other proprietary
   rights which may cover technology that may be required to practice
   this standard.  Please address the information to the IETF Executive
   Director.

6.  Acknowledgements

   This memo has been produced by the IETF's Entity MIB working group.

7.  References

   [RFC1155] Rose, M. and K. McCloghrie, "Structure and Identification
             of Management Information for TCP/IP-based Internets", STD
             16, RFC 1155, May 1990.

   [RFC1157] Case, J., Fedor, M., Schoffstall, M. and J. Davin, "Simple
             Network Management Protocol", STD 15, RFC 1157, May 1990.

   [RFC1212] Rose, M. and K. McCloghrie, "Concise MIB Definitions", STD
             16, RFC 1212, March 1991.

   [RFC1215] Rose, M., "A Convention for Defining Traps for use with the
             SNMP", RFC 1215, March 1991.

   [RFC1493] Decker, E., Langille, P., Rijsinghani, A. and K.
             McCloghrie, "Definitions of Managed Objects for Bridges",
             RFC 1493, July 1993.

   [RFC1516] McMaster, D. and K. McCloghrie, "Definitions of Managed
             Objects for IEEE 802.3 Repeater Devices", RFC 1516,
             September 1993.

   [RFC1901] Case, J., McCloghrie, K., Rose, M. and S. Waldbusser,
             "Introduction to Community-based SNMPv2", RFC 1901, January
             1996.

   [RFC1905] Case, J., McCloghrie, K., Rose, M. and S. Waldbusser,
             "Protocol Operations for Version 2 of the Simple Network
             Management Protocol (SNMPv2)", RFC 1905, January 1996.

   [RFC1906] Case, J., McCloghrie, K., Rose, M. and S. Waldbusser,
             "Transport Mappings for Version 2 of the Simple Network
             Management Protocol (SNMPv2)", RFC 1906, January 1996.

   [RFC2026] Bradner, S., "The Internet Standards Process -- Revision
             3", BCP 9, RFC 2026, October 1996.

   [RFC2037] McCloghrie, K. and A. Bierman, "Entity MIB using SMIv2",
             RFC 2037, October 1996.

   [RFC2108] de Graaf, K., Romascanu, D., McMaster, D. and K.
             McCloghrie, "Definitions of Managed Objects for IEEE 802.3
             Repeater Devices using SMIv2", RFC 2108, February 1997.

   [RFC2233] McCloghrie, K. and F. Kastenholz, "The Interfaces Group MIB
             Using SMIv2", RFC 2233, November 1997.

   [RFC2570] Case, J., Mundy, R., Partain, D. and B. Stewart,
             "Introduction to Version 3 of the Internet-standard Network
             Management Framework", RFC 2570, April 1999.

   [RFC2571] Harrington, D., Presuhn, R. and B. Wijnen, "An Architecture
             for Describing SNMP Management Frameworks", RFC 2571, April
             1999.

   [RFC2572] Case, J., Harrington D., Presuhn R. and B. Wijnen, "Message
             Processing and Dispatching for the Simple Network
             Management Protocol (SNMP)", RFC 2572, April 1999.

   [RFC2573] Levi, D., Meyer, P. and B. Stewart, "SNMPv3 Applications",
             RFC 2573, April 1999.

   [RFC2574] Blumenthal, U. and B. Wijnen, "User-based Security Model
             (USM) for version 3 of the Simple Network Management
             Protocol (SNMPv3)", RFC 2574, April 1999.

   [RFC2575] Wijnen, B., Presuhn, R. and K. McCloghrie, "View-based
             Access Control Model (VACM) for the Simple Network
             Management Protocol (SNMP)", RFC 2575, April 1999.

   [RFC2578] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J.,
             Rose, M.  and S. Waldbusser, "Structure of Management
             Information Version 2 (SMIv2)", STD 58, RFC 2578, April
             1999.

   [RFC2579] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J.,
             Rose, M.  and S. Waldbusser, "Textual Conventions for
             SMIv2", STD 58, RFC 2579, April 1999.

   [RFC2580] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J.,
             Rose, M.  and S. Waldbusser, "Conformance Statements for
             SMIv2", STD 58, RFC 2580, April 1999.

8.  Security Considerations

   There are a number of management objects defined in this MIB that
   have a MAX-ACCESS clause of read-write and/or read-create.  Such
   objects may be considered sensitive or vulnerable in some network
   environments.  The support for SET operations in a non-secure
   environment without proper protection can have a negative effect on
   network operations.

   There are a number of managed objects in this MIB that may contain
   sensitive information. These are:

      entPhysicalDescr
      entPhysicalVendorType
      entPhysicalHardwareRev
      entPhysicalFirmwareRev
      entPhysicalSoftwareRev
      entPhysicalSerialNum
      entPhysicalMfgName
      entPhysicalModelName

   These objects expose information about the physical entities within a
   managed system, which may be used to identify the vendor, model, and
   version information of each system component.

      entPhysicalAssetID

   This object can allow asset identifiers for various system components
   to be exposed, in the event this MIB object is actually configured by
   an NMS application.

      entLogicalDescr
      entLogicalType

   These objects expose the type of logical entities present in the
   managed system.

      entLogicalCommunity

   This object exposes community names associated with particular
   logical entites within the system.

      entLogicalTAddress
      entLogicalTDomain

   These objects expose network addresses that can be used to
   communicate with an SNMP agent on behalf of particular logical
   entities within the system.

      entLogicalContextEngineID
      entLogicalContextName

   These objects identify the authoritative SNMP engine that contains
   information on behalf of particular logical entities within the
   system.

   It is thus important to control even GET access to these objects and
   possibly to even encrypt the values of these object when sending them
   over the network via SNMP.  Not all versions of SNMP provide features
   for such a secure environment.

   SNMPv1 by itself is not a secure environment.  Even if the network
   itself is secure (for example by using IPSec), even then, there is no
   control as to who on the secure network is allowed to access and
   GET/SET (read/change/create/delete) the objects in this MIB.

   It is recommended that the implementers consider the security
   features as provided by the SNMPv3 framework.  Specifically, the use
   of the User-based Security Model RFC 2574 [RFC2574] and the View-
   based Access Control Model RFC 2575 [RFC2575] is recommended.

   It is then a customer/user responsibility to ensure that the SNMP
   entity giving access to an instance of this MIB, is properly
   configured to give access to the objects only to those principals
   (users) that have legitimate rights to indeed GET or SET
   (change/create/delete) them.

9.  Authors' Addresses

   Keith McCloghrie
   Cisco Systems, Inc.
   170 West Tasman Drive
   San Jose, CA 95134 USA
   Phone: +1 408-526-5260
   EMail: kzm@cisco.com


   Andy Bierman
   Cisco Systems, Inc.
   170 West Tasman Drive
   San Jose, CA 95134 USA
   Phone: +1 408-527-3711
   EMail: abierman@cisco.com

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Acknowledgement

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