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IETF RFC 6933
Last modified on Friday, May 24th, 2013
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Internet Engineering Task Force (IETF) A. Bierman
Request for Comments: 6933 YumaWorks, Inc.
Obsoletes: 4133 D. Romascanu
Category: Standards Track Avaya
ISSN: 2070-1721 J. Quittek
NEC Europe Ltd.
M. Chandramouli
Cisco Systems, Inc.
May 2013
Entity MIB (Version 4)
 Abstract
This memo defines a portion of the Management Information Base (MIB)
for use with network management protocols in the Internet community.
In particular, it describes managed objects used for managing
multiple logical and physical entities managed by a single Simple
Network Management Protocol (SNMP) agent. This document specifies
version 4 of the Entity MIB. This memo obsoletes version 3 of the
Entity MIB module published as RFC 4133.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in Section 2 of RFC 5741.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/RFC 6933.
Copyright Notice
Copyright (c) 2013 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must
Bierman, et al. Standards Track PAGE 1 
RFC 6933 Entity MIB (Version 4) May 2013
include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
1. The SNMP Management Framework ...................................3
2. Overview ........................................................3
2.1. Terms ......................................................5
2.2. Relationship to Community Strings ..........................6
2.3. Relationship to SNMP Contexts ..............................6
2.4. Relationship to Proxy Mechanisms ...........................6
2.5. Relationship to a Chassis MIB ..............................7
2.6. Relationship to the Interfaces MIB .........................7
2.7. Relationship to the Other MIB Modules ......................7
2.8. Relationship to Naming Scopes ..............................7
2.9. Multiple Instances of the Entity MIB .......................8
2.10. Re-Configuration of Entities ..............................9
2.11. Textual Convention Change .................................9
2.12. MIB Structure .............................................9
2.12.1. entityPhysical Group ..............................10
2.12.2. entityLogical Group ...............................12
2.12.3. entityMapping Group ...............................12
2.12.4. entityGeneral Group ...............................13
2.12.5. entityNotifications Group .........................13
2.13. Multiple Agents ..........................................13
2.14. Changes Since RFC 2037 ...................................14
2.14.1. Textual Conventions ...............................14
2.14.2. New entPhysicalTable Objects ......................14
2.14.3. New entLogicalTable Objects .......................14
2.14.4. Bug Fixes .........................................14
2.15. Changes Since RFC 2737 ...................................15
2.15.1. Textual Conventions ...............................15
2.15.2. New Objects .......................................15
2.15.3. Bug Fixes .........................................15
2.16. Changes Since RFC 4133 ...................................15
2.16.1. MIB Module Addition ...............................15
2.16.2. Modification to Some of the MIB Objects ...........15
2.16.3. New TC for Universally Unique Identifier ..........16
3. MIB Definitions ................................................16
3.1. ENTITY-MIB ................................................16
3.2. IANA-ENTITY-MIB ...........................................50
3.3. UUID-TC-MIB ...............................................53
4. Usage Examples .................................................55
4.1. Router/Bridge .............................................55
4.2. Repeaters .................................................62
4.3. EMAN Example ..............................................69
5. Security Considerations ........................................70
Bierman, et al. Standards Track PAGE 2
RFC 6933 Entity MIB (Version 4) May 2013
6. IANA Considerations ............................................72
7. Acknowledgements ...............................................73
8. References .....................................................73
8.1. Normative References ......................................73
8.2. Informative References ....................................74
1. The SNMP Management Framework
For a detailed overview of the documents that describe the current
Internet-Standard Management Framework, please refer to section 7 of
RFC 3410 [RFC 3410].
Managed objects are accessed via a virtual information store, termed
the Management Information Base or MIB. MIB objects are generally
accessed through the Simple Network Management Protocol (SNMP).
Objects in the MIB are defined using the mechanisms defined in the
Structure of Management Information (SMI). This memo specifies a MIB
module that is compliant to the SMIv2, which is described in STD 58,
RFC 2578 [RFC 2578], STD 58, RFC 2579 [RFC 2579] and STD 58, RFC 2580
[RFC 2580].
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in RFC
2119 [RFC 2119].
2. Overview
There is a need for a standardized way of representing a single
agent, which supports multiple instances of one MIB module. This is
presently true for at least 3 standard MIB modules and is likely to
become true for more and more MIB modules as time passes. For
example:
- multiple instances of a bridge supported within a single device
that has a single agent;
- multiple repeaters supported by a single agent; and
- multiple OSPF backbone areas, each operating as part of its own
Autonomous System and each identified by the same area-id (e.g.,
0.0.0.0), supported inside a single router with one agent.
The single agent present in each of these cases implies a
relationship binds these entities. Effectively, there is some
"overall" physical entity that houses the sum of the things managed
by that one agent, i.e., there are multiple "logical" entities within
a single physical entity. Sometimes, the overall physical entity
Bierman, et al. Standards Track PAGE 3
RFC 6933 Entity MIB (Version 4) May 2013
contains multiple (smaller) physical entities, and each logical
entity is associated with a particular physical entity. Sometimes,
the overall physical entity is a "compound" of multiple physical
entities (e.g., a stack of stackable hubs).
What is needed is a way to determine exactly which logical entities
are managed by the agent (with some version of SNMP) in order to
communicate with the agent about a particular logical entity. When
different logical entities are associated with different physical
entities within the overall physical entity, it is also useful to be
able to use this information to distinguish between logical entities.
In these situations, there is no need for varbinds for multiple
logical entities to be referenced in the same SNMP message (although
that might be useful in the future). Rather, it is sufficient, and
in some situations preferable, to have the context/community in the
message identify the logical entity to which the varbinds apply.
Version 2 of this MIB addresses new requirements that have emerged
since the publication of the first Entity MIB [RFC 2037]. There is a
need for a standardized way of providing non-volatile,
administratively assigned identifiers for physical components
represented with the Entity MIB. There is also a need to align the
Entity MIB with the SNMPv3 administrative framework (STD 62,
[RFC 3411]). Implementation experience has shown that additional
physical component attributes are also desirable.
Version 3 of this MIB addresses new requirements that have emerged
since the publication of the second Entity MIB [RFC 2737]. There is a
need to identify physical entities that are central processing units
(CPUs) and a need to provide a Textual Convention (TC) that
identifies an entPhysicalIndex value or zero, where the value zero
has application-specific semantics. Two new objects have been added
to the entPhysicalTable to identify the manufacturing date and
provide additional URIs for a particular physical entity.
Version 4 of this MIB addresses new requirements that have emerged
since the publication of the third version of the Entity MIB
[RFC 4133]. There is a need to add new enumerated values for entity
physical classes, a need to provide identification information for
physical entities using a Universally Unique Identifier (UUID)
format, and a need to have compliant implementations of the Entity
MIB with a smaller subsets of MIB objects for devices with
constrained resources.
The PhysicalClass TEXTUAL-CONVENTION was deprecated, and a new
IANAPhysicalClass TC (maintained by IANA) was created. A new TC,
UUIDorZero, was created to represent a UUID, and a new MIB object was
Bierman, et al. Standards Track PAGE 4
RFC 6933 Entity MIB (Version 4) May 2013
added to the entPhysicalTable to identify an entity. A new
compliance statement, entity4CRCompliance, has been added for
possible implementation of a selected subset of MIB objects by
entities with constrained resources.
2.1. Terms
The following terms are used throughout this document:
- Naming Scope
A "naming scope" represents the set of information that may be
potentially accessed through a single SNMP operation. All
instances within the naming scope share the same unique identifier
space. For SNMPv1, a naming scope is identified by the value of
the associated entLogicalCommunity instance. For SNMPv3, the term
"context" is used instead of "naming scope". The complete
definition of an SNMP context can be found in Section 3.3.1 of RFC
3411 [RFC 3411].
- Multi-Scoped Object
A MIB object for which identical instance values identify different
managed information in different naming scopes is called a "multi-
scoped" MIB object.
- Single-Scoped Object
A MIB object for which identical instance values identify the same
managed information in different naming scopes is called a "single-
scoped" MIB object.
- Logical Entity
A managed system contains one or more "logical entities", each
represented by at most one instantiation of each of a particular
set of MIB objects. A set of management functions is associated
with each logical entity. Examples of logical entities include
routers, bridges, print-servers, etc.
- Physical Entity
A "physical entity" or "physical component" represents an
identifiable physical resource within a managed system. Zero or
more logical entities may utilize a physical resource at any given
time. Determining which physical components are represented by an
agent in the EntPhysicalTable is an implementation-specific matter.
Typically, physical resources (e.g., communications ports,
backplanes, sensors, daughter-cards, power supplies, and the
overall chassis), which can be managed via functions associated
with one or more logical entities, are included in the MIB.
Bierman, et al. Standards Track PAGE 5
RFC 6933 Entity MIB (Version 4) May 2013
- Containment Tree
Each physical component may be modeled as 'contained' within
another physical component. A "containment-tree" is the conceptual
sequence of entPhysicalIndex values that uniquely specifies the
exact physical location of a physical component within the managed
system. It is generated by 'following and recording' each
entPhysicalContainedIn instance 'up the tree towards the root'
until a value of zero, indicating no further containment, is found.
2.2. Relationship to Community Strings
For community-based SNMP, differentiating logical entities is one
(but not the only) purpose of the community string [RFC 1157]. This
is accommodated by representing each community string as a logical
entity.
Note that different logical entities may share the same naming scope
and, therefore, the same values of entLogicalCommunity. This is
possible, providing they have no need for the same instance of a MIB
object to represent different managed information.
2.3. Relationship to SNMP Contexts
Version 2 of the Entity MIB contains support for associating SNMPv3
contexts with logical entities. Two new MIB objects, defining an
SnmpEngineID and ContextName pair, are used together to identify an
SNMP context associated with a logical entity. This context can be
used (in conjunction with the entLogicalTAddress and
entLogicalTDomain MIB objects) to send SNMPv3 messages on behalf of a
particular logical entity.
2.4. Relationship to Proxy Mechanisms
The Entity MIB is designed to allow functional component discovery.
The administrative relationships between different logical entities
are not visible in any Entity MIB tables. A Network Management
System (NMS) cannot determine whether MIB instances in different
naming scopes are realized locally or remotely (e.g., via some proxy
mechanism) by examining any particular Entity MIB objects.
The management of administrative framework functions is not an
explicit goal of the Entity MIB WG at this time. This new area of
functionality may be revisited after some operational experience with
the Entity MIB is gained.
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RFC 6933 Entity MIB (Version 4) May 2013
Note that for community-based versions of SNMP, a network
administrator will likely be able to associate community strings with
naming scopes that have proprietary mechanisms, as a matter of
configuration. There are no mechanisms for managing naming scopes
defined in this MIB.
2.5. Relationship to a Chassis MIB
Some readers may recall that a previous IETF working group attempted
to define a Chassis MIB. No consensus was reached by that working
group, possibly because its scope was too broad. As such, it is not
the purpose of the ENTITY-MIB module to be a "Chassis MIB
replacement", nor is it within the scope of the ENTITY-MIB module to
contain all the information that might be necessary to manage a
"chassis". On the other hand, the entities represented by an
implementation of the ENTITY-MIB module might well be contained in a
chassis.
2.6. Relationship to the Interfaces MIB
The Entity MIB contains a mapping table identifying physical
components that have 'external values' (e.g., ifIndex) associated
with them within a given naming scope. This table can be used to
identify the physical location of each interface in the ifTable
[RFC 2863]. Because ifIndex values in different contexts are not
related to one another, the interface-to-physical-component
associations are relative to the same logical entity within the
agent.
The Entity MIB also contains entPhysicalName and entPhysicalAlias
objects, which approximate the semantics of the ifName and ifAlias
objects (respectively) from the Interfaces MIB [RFC 2863] for all
types of physical components.
2.7. Relationship to the Other MIB Modules
The Entity MIB contains a mapping table identifying physical
components that have identifiers from other standard MIB modules
associated with them. For example, this table can be used along with
the physical mapping table to identify the physical location of each
repeater port in the rptrPortTable or each interface in the ifTable.
2.8. Relationship to Naming Scopes
There is some question as to which MIB objects may be returned within
a given naming scope. MIB objects that are not multi-scoped within a
managed system are likely to ignore context information in
Bierman, et al. Standards Track PAGE 7
RFC 6933 Entity MIB (Version 4) May 2013
implementation. In such a case, it is likely such objects will be
returned in all naming scopes (e.g., not just the 'default' naming
scope or the SNMPv3 default context).
For example, a community string used to access the management
information for logical device 'bridge2' may allow access to all the
non-bridge-related objects in the 'default' naming scope, as well as
a second instance of the Bridge MIB [RFC 4188].
The isolation of single-scoped MIB objects by the agent is an
implementation-specific matter. An agent may wish to limit the
objects returned in a particular naming scope to only the multi-
scoped objects in that naming scope (e.g., system group and the
Bridge MIB). In this case, all single-scoped management information
would belong to a common naming scope (e.g., 'default'), which itself
may contain some multi-scoped objects (e.g., system group).
2.9. Multiple Instances of the Entity MIB
It is possible that more than one agent may exist in a managed
system. In such cases, multiple instances of the Entity MIB
(representing the same managed objects) may be available to an NMS.
In order to reduce complexity for agent implementation, multiple
instances of the Entity MIB are not required to be equivalent or even
consistent. An NMS may be able to 'align' instances returned by
different agents by examining the columns of each table, but vendor-
specific identifiers and (especially) index values are likely to be
different. Each agent may be managing different subsets of the
entire chassis as well.
When all of a physically modular device is represented by a single
agent, the entry (for which entPhysicalContainedIn has the value
zero) would likely have 'chassis' as the value of its
entPhysicalClass. Alternatively, for an agent on a module where the
agent represents only the physical entities on that module (not those
on other modules), the entry (for which entPhysicalContainedIn has
the value zero) would likely have 'module' as the value of its
entPhysicalClass.
An agent implementation of the entLogicalTable is not required to
contain information about logical entities managed primarily by other
agents. That is, the entLogicalTAddress and entLogicalTDomain
objects in the entLogicalTable are provided to support a historical
multiplexing mechanism, not to identify other SNMP agents.
Note that the Entity MIB is a single-scoped MIB, in the event an
agent represents the MIB in different naming scopes.
Bierman, et al. Standards Track PAGE 8
RFC 6933 Entity MIB (Version 4) May 2013
2.10. Re-Configuration of Entities
Most of the MIB objects defined in this MIB have, at most, a read-
only MAX-ACCESS clause. This is a conscious decision by the working
group to limit this MIB's scope. The second version of the Entity
MIB allows a network administrator to configure some common
attributes of physical components.
2.11. Textual Convention Change
Version 1 of the Entity MIB contains three MIB objects defined with
the (now obsolete) DisplayString TEXTUAL-CONVENTION. In version 2 of
the Entity MIB, the syntax for these objects has been updated to use
the (now preferred) SnmpAdminString TEXTUAL-CONVENTION.
The ENTMIB working group (which was in charge of the document at that
point) realized that this change is not strictly supported by SMIv2.
In their judgment, the alternative of deprecating the old objects and
defining new objects would have had a more adverse impact on backward
compatibility and interoperability, given the particular semantics of
these objects.
2.12. MIB Structure
The Entity MIB contains five groups of MIB objects:
- entityPhysical group
Describes the physical entities managed by a single agent.
- entityLogical group
Describes the logical entities managed by a single agent.
- entityMapping group
Describes the associations between the physical entities, logical
entities, interfaces, and non-interface ports managed by a single
agent.
- entityGeneral group
Describes general system attributes shared by potentially all types
of entities managed by a single agent.
- entityNotifications group
Contains status indication notifications.
Bierman, et al. Standards Track PAGE 9
RFC 6933 Entity MIB (Version 4) May 2013
2.12.1. entityPhysical Group
This group contains a single table to identify physical system
components, called the entPhysicalTable.
The entPhysicalTable contains one row per physical entity and must
always contain at least one row for an "overall" physical entity,
which should have an entPhysicalClass value of 'stack(11)',
'chassis(3)', or 'module(9)'.
Each row is indexed by an arbitrary, small integer and contains a
description and type of the physical entity. It also optionally
contains the index number of another entPhysicalEntry, indicating a
containment relationship between the two.
Version 2 of the Entity MIB provides additional MIB objects for each
physical entity. Some common read-only attributes have been added,
as well as three writable string objects.
- entPhysicalAlias
This string can be used by an NMS as a non-volatile identifier for
the physical component. Maintaining a non-volatile string for
every physical component represented in the entPhysicalTable can be
costly and unnecessary. An agent may algorithmically generate
entPhysicalAlias strings for particular entries (e.g., based on the
entPhysicalClass value).
- entPhysicalAssetID
This string is provided to store a user-specific asset identifier
for removable physical components. In order to reduce the non-
volatile storage needed by a particular agent, a network
administrator should only assign asset identifiers to physical
entities that are field-replaceable (i.e., not permanently
contained within another physical entity).
- entPhysicalSerialNum
This string is provided to store a vendor-specific serial number
string for physical components. This writable object is used when
an agent cannot identify the serial numbers of all installed
physical entities and a network administrator wishes to configure
the non-volatile serial number strings manually (via an NMS
application).
Bierman, et al. Standards Track PAGE 10
RFC 6933 Entity MIB (Version 4) May 2013
Version 3 of the Entity MIB provides two additional MIB objects for
each physical entity:
- entPhysicalMfgDate
This object contains the date of manufacturing of the managed
entity. If the manufacturing date is unknown or not supported the
object is not instantiated. The special value '0000000000000000'H
may also be returned in this case.
- entPhysicalUris
This object provides additional identification information about
the physical entity.
This object contains one or more Uniform Resource Identifiers
(URIs); therefore, the syntax of this object must conform to
[RFC 3986], Section 3. Uniform Resource Names (URNs) [RFC 3406] are
resource identifiers with the specific requirements for enabling
location-independent identification of a resource, as well as
longevity of reference. URNs are part of the larger URI family
with the specific goal of providing persistent naming of resources.
URI schemes and URN namespaces are registered by IANA (see
http://www.iana.org/assignments/uri-schemes and
http://www.iana.org/assignments/urn-namespaces).
For example, the entPhysicalUris object may be used to encode a URI
containing a Common Language Equipment Identifier (CLEI) URN for
the managed physical entity. The URN namespace for CLEIs is
defined in [RFC 4152], and the CLEI format is defined in [T1.213]
and [T1.213a]. For example, an entPhysicalUris instance may have
the value of:
URN:CLEI:D4CE18B7AA
[RFC 3986] and [RFC 4152] identify this as a URI in the CLEI URN
namespace. The specific CLEI code, D4CE18B7AA, is based on the
example provided in [T1.213a].
Multiple URIs may be present and are separated by white space
characters. Leading and trailing white space characters are
ignored.
If no additional identification information is known about the
physical entity or supported, the object is not instantiated.
Version 4 of the Entity MIB module provides an additional MIB
object for each physical entity.
Bierman, et al. Standards Track PAGE 11
RFC 6933 Entity MIB (Version 4) May 2013
- entPhysicalUUID
This object provides an unique identification about the physical
entity. This object contains a globally unique identifier for the
physical entity with the format defined in RFC 4122 [RFC 4122].
To support the existing implementations of ENTITY-MIB version 3
[RFC 4133], entPhysicalUris object should be used to store the UUID
value of the physical entity as well in URN format. This
duplication of information enables backward compatibility. Note
that entPhysicalUris allows write access while entPhysicalUUID is
read-only.
2.12.2. entityLogical Group
This group contains a single table to identify logical entities,
called the entLogicalTable.
The entLogicalTable contains one row per logical entity. Each row is
indexed by an arbitrary, small integer and contains a name,
description, and type of the logical entity. It also contains
information to allow access to the MIB information for the logical
entity. This includes SNMP versions that use a community name (with
some form of implied context representation) and SNMP versions that
use the SNMP ARCH [RFC 3411] method of context identification.
If an agent represents multiple logical entities with this MIB, then
this group must be implemented for all logical entities known to the
agent.
If an agent represents a single logical entity, or multiple logical
entities within a single naming scope, then implementation of this
group may be omitted by the agent.
2.12.3. entityMapping Group
This group contains three tables to identify associations between
different system components.
- entLPMappingTable
This table contains mappings between entLogicalIndex values
(logical entities) and entPhysicalIndex values (the physical
components supporting that entity). A logical entity can map to
more than one physical component, and more than one logical entity
can map to (share) the same physical component. If an agent
represents a single logical entity, or multiple logical entities
within a single naming scope, then implementation of this table may
be omitted by the agent.
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RFC 6933 Entity MIB (Version 4) May 2013
- entAliasMappingTable
This table contains mappings between entLogicalIndex,
entPhysicalIndex pairs, and 'alias' object identifier values. This
allows resources managed with other MIB modules (e.g., repeater
ports, bridge ports, physical and logical interfaces) to be
identified in the physical entity hierarchy. Note that each alias
identifier is only relevant in a particular naming scope. If an
agent represents a single logical entity, or multiple logical
entities within a single naming scope, then implementation of this
table may be omitted by the agent.
- entPhysicalContainsTable
This table contains simple mappings between entPhysicalContainedIn
values for each container/'containee' relationship in the managed
system. The indexing of this table allows an NMS to quickly
discover the entPhysicalIndex values for all children of a given
physical entity.
2.12.4. entityGeneral Group
This group contains general information relating to the other object
groups.
At this time, the entGeneral group contains a single scalar object
(entLastChangeTime), which represents the value of sysUpTime when any
part of the Entity MIB configuration last changed.
2.12.5. entityNotifications Group
This group contains notification definitions relating to the overall
status of the Entity MIB instantiation.
2.13. Multiple Agents
Even though a primary motivation for this MIB is to represent the
multiple logical entities supported by a single agent, another
motivation is to represent multiple logical entities supported by
multiple agents (in the same "overall" physical entity). Indeed, it
is implicit in the SNMP architecture that the number of agents is
transparent to a network management station.
However, there is no agreement at this time as to the degree of
cooperation that should be expected for agent implementations.
Therefore, multiple agents within the same managed system are free to
implement the Entity MIB independently. (For more information, refer
to Section 2.9, "Multiple Instances of the Entity MIB".)
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RFC 6933 Entity MIB (Version 4) May 2013
2.14. Changes Since RFC 2037
2.14.1. Textual Conventions
The PhysicalClass TC text has been clarified, and a new enumeration
to support 'stackable' components has been added. The
SnmpEngineIdOrNone TC has been added to support SNMPv3.
2.14.2. New entPhysicalTable Objects
The entPhysicalHardwareRev, entPhysicalFirmwareRev, and
entPhysicalSoftwareRev objects have been added for revision
identification.
The entPhysicalSerialNum, entPhysicalMfgName, entPhysicalModelName,
and entPhysicalIsFRU objects have been added for better vendor
identification for physical components. In the event the agent
cannot identify this information, the entPhysicalSerialNum object can
be set by a management station.
The entPhysicalAlias and entPhysicalAssetID objects have been added
for better user component identification. These objects are intended
to be set by a management station and preserved by the agent across
restarts.
2.14.3. New entLogicalTable Objects
The entLogicalContextEngineID and entLogicalContextName objects have
been added to provide an SNMP context for SNMPv3 access on behalf of
a logical entity.
2.14.4. Bug Fixes
A bug was fixed in the entLogicalCommunity object. The subrange was
incorrect (1..255) and is now correct (0..255). The description
clause has also been clarified. This object is now deprecated.
The entLastChangeTime object description has been changed to
generalize the events that cause an update to the last change
timestamp.
The syntax was changed from DisplayString to SnmpAdminString for the
entPhysicalDescr, entPhysicalName, and entLogicalDescr objects.
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RFC 6933 Entity MIB (Version 4) May 2013
2.15. Changes Since RFC 2737
2.15.1. Textual Conventions
The PhysicalIndexOrZero TC has been added to allow objects to
reference an entPhysicalIndex value or zero. The PhysicalClass TC
has been extended to support a new enumeration for central processing
units.
2.15.2. New Objects
The entPhysicalMfgDate object has been added to the entPhysicalTable
to provide the date of manufacturing of the managed entity.
The entPhysicalUris object has been added to the entPhysicalTable to
provide additional identification information about the physical
entity, such as a Common Language Equipment Identifier (CLEI) URN.
2.15.3. Bug Fixes
The syntax was changed from INTEGER to Integer32 for the
entPhysicalParentRelPos, entLogicalIndex, and
entAliasLogicalIndexOrZero objects, and from INTEGER to
PhysicalIndexOrZero for the entPhysicalContainedIn object.
2.16. Changes Since RFC 4133
2.16.1. MIB Module Addition
Over time, there may be the need to add new enumerated values to the
PhysicalClass TEXTUAL-CONVENTION. To allow for such additions
without requiring re-issuing of this MIB module, a new MIB module
called IANA-ENTITY-MIB that provides the IANA-maintained TEXTUAL-
CONVENTION IANAPhysicalClass has been created. The PhysicalClass TC
has been deprecated.
2.16.2. Modification to Some of the MIB Objects
A new MIB object has been added to the entPhysicalTable,
entPhysicalUUID. In comparison to entPhysicalUris, the new object is
read-only and restricted to a fixed size to allow only for RFC 4122
[RFC 4122] compliant values. The PhysicalClass TEXTUAL-CONVENTION was
deprecated, and a new IANAPhysicalClass TC (maintained by IANA) has
been created.
Bierman, et al. Standards Track PAGE 15
RFC 6933 Entity MIB (Version 4) May 2013
Two new MODULE-COMPLIANCE modules have been created:
entity4Compliance for full compliance with version 4 of the Entity
MIB, and entity4CRCompliance for devices with constrained resources
like batteries that might require a limited number of objects to be
supported (entPhysicalClass, entPhysicalName, and entPhysicalUUID).
2.16.3. New TC for Universally Unique Identifier
A new TEXTUAL-CONVENTION, UUIDorZero, was created to represent a
Universally Unique Identifier (UUID) with a syntax that conforms to
[RFC 4122], Section 4.1. Defining it as a TC will allow for future
reuse in other MIB modules that will import the TC. This Textual
Convention is included in the UUID-TC-MIB module.
3. MIB Definitions
3.1. ENTITY-MIB
ENTITY-MIB DEFINITIONS ::= BEGIN
IMPORTS
MODULE-IDENTITY, OBJECT-TYPE, mib-2, NOTIFICATION-TYPE,
Integer32
FROM SNMPv2-SMI -- RFC 2578
TDomain, TAddress, TEXTUAL-CONVENTION,
AutonomousType, RowPointer, TimeStamp, TruthValue,
DateAndTime
FROM SNMPv2-TC -- RFC 2579
MODULE-COMPLIANCE, OBJECT-GROUP, NOTIFICATION-GROUP
FROM SNMPv2-CONF -- RFC 2580
SnmpAdminString
FROM SNMP-FRAMEWORK-MIB -- RFC 3411
UUIDorZero
FROM UUID-TC-MIB -- RFC 6933
IANAPhysicalClass
FROM IANA-ENTITY-MIB; -- RFC 6933
entityMIB MODULE-IDENTITY
LAST-UPDATED "201304050000Z" -- April 5, 2013
ORGANIZATION "IETF Energy Management Working Group"
CONTACT-INFO
"WG Email: eman@ietf.org
Mailing list subscription info:
http://www.ietf.org/mailman/listinfo/eman
Bierman, et al. Standards Track PAGE 16
RFC 6933 Entity MIB (Version 4) May 2013
Andy Bierman
YumaWorks, Inc.
274 Redwood Shores Parkway, #133
Redwood City, CA 94065
USA
Phone: +1 408-716-0466
Email: andy@yumaworks.com
Dan Romascanu
Avaya
Park Atidim, Bldg. #3
Tel Aviv, 61581
Israel
Phone: +972-3-6458414
Email: dromasca@avaya.com
Juergen Quittek
NEC Europe Ltd.
Network Research Division
Kurfuersten-Anlage 36
Heidelberg 69115
Germany
Phone: +49 6221 4342-115
Email: quittek@neclab.eu
Mouli Chandramouli
Cisco Systems, Inc.
Sarjapur Outer Ring Road
Bangalore 560103
India
Phone: +91 80 4429 2409
Email: moulchan@cisco.com"
DESCRIPTION
"The MIB module for representing multiple logical
entities supported by a single SNMP agent.
Copyright (c) 2013 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)."
REVISION "201304050000Z" -- April 5, 2013
Bierman, et al. Standards Track PAGE 17
RFC 6933 Entity MIB (Version 4) May 2013
DESCRIPTION
"Entity MIB (Version 4).
This revision obsoletes RFC 4133.
- Creation of a new MIB module, IANA-ENTITY-MIB, which
makes the PhysicalIndex TC an IANA-maintained TEXTUAL-
CONVENTION. IANAPhysicalClass is now imported
from the IANA-ENTITY-MIB.
- Addition of a new MIB object to the entPhysicalTable,
entPhysicalUUID. UUIDorZero is imported from the
UUID-TC-MIB.
- Addition of two new MODULE-COMPLIANCE modules-
entity4Compliance and entity4CRCompliance.
This version is published as RFC 6933."
REVISION "200508100000Z"
DESCRIPTION
"Initial Version of Entity MIB (Version 3).
This revision obsoletes RFC 2737.
Additions:
- cpu(12) enumeration added to IANAPhysicalClass TC
- DISPLAY-HINT clause to PhysicalIndex TC
- PhysicalIndexOrZero TC
- entPhysicalMfgDate object
- entPhysicalUris object
Changes:
- entPhysicalContainedIn SYNTAX changed from
INTEGER to PhysicalIndexOrZero
This version was published as RFC 4133."
REVISION "199912070000Z"
DESCRIPTION
"Initial Version of Entity MIB (Version 2).
This revision obsoletes RFC 2037.
This version was published as RFC 2737."
REVISION "199610310000Z"
DESCRIPTION
"Initial version (version 1), published as
RFC 2037."
::= { mib-2 47 }
entityMIBObjects OBJECT IDENTIFIER ::= { entityMIB 1 }
Bierman, et al. Standards Track PAGE 18
RFC 6933 Entity MIB (Version 4) May 2013
-- MIB contains four groups
entityPhysical OBJECT IDENTIFIER ::= { entityMIBObjects 1 }
entityLogical OBJECT IDENTIFIER ::= { entityMIBObjects 2 }
entityMapping OBJECT IDENTIFIER ::= { entityMIBObjects 3 }
entityGeneral OBJECT IDENTIFIER ::= { entityMIBObjects 4 }
-- Textual Conventions
PhysicalIndex ::= TEXTUAL-CONVENTION
DISPLAY-HINT "d"
STATUS current
DESCRIPTION
"An arbitrary value that uniquely identifies the physical
entity. The value should be a small positive integer.
Index values for different physical entities are not
necessarily contiguous."
SYNTAX Integer32 (1..2147483647)
PhysicalIndexOrZero ::= TEXTUAL-CONVENTION
DISPLAY-HINT "d"
STATUS current
DESCRIPTION
"This TEXTUAL-CONVENTION is an extension of the
PhysicalIndex convention, which defines a greater than zero
value used to identify a physical entity. This extension
permits the additional value of zero. The semantics of the
value zero are object-specific and must, therefore, be
defined as part of the description of any object that uses
this syntax. Examples of the usage of this extension are
situations where none or all physical entities need to be
referenced."
SYNTAX Integer32 (0..2147483647)
SnmpEngineIdOrNone ::= TEXTUAL-CONVENTION
STATUS current
DESCRIPTION
"A specially formatted SnmpEngineID string for use with the
Entity MIB.
If an instance of an object of SYNTAX SnmpEngineIdOrNone has
a non-zero length, then the object encoding and semantics
are defined by the SnmpEngineID TEXTUAL-CONVENTION (see STD
62, RFC 3411).
Bierman, et al. Standards Track PAGE 19
RFC 6933 Entity MIB (Version 4) May 2013
If an instance of an object of SYNTAX SnmpEngineIdOrNone
contains a zero-length string, then no appropriate
SnmpEngineID is associated with the logical entity (i.e.,
SNMPv3 is not supported)."
SYNTAX OCTET STRING (SIZE(0..32)) -- empty string or SnmpEngineID
PhysicalClass ::= TEXTUAL-CONVENTION
STATUS deprecated
DESCRIPTION
"Starting with version 4 of the ENTITY-MIB, this TC is
deprecated, and the usage of the IANAPhysicalClass TC from
the IANA-ENTITY-MIB is recommended instead.
An enumerated value that provides an indication of the
general hardware type of a particular physical entity.
There are no restrictions as to the number of
entPhysicalEntries of each entPhysicalClass, which must be
instantiated by an agent.
The enumeration 'other' is applicable if the physical entity
class is known but does not match any of the supported
values.
The enumeration 'unknown' is applicable if the physical
entity class is unknown to the agent.
The enumeration 'chassis' is applicable if the physical
entity class is an overall container for networking
equipment. Any class of physical entity, except a stack,
may be contained within a chassis; a chassis may only
be contained within a stack.
The enumeration 'backplane' is applicable if the physical
entity class is some sort of device for aggregating and
forwarding networking traffic, such as a shared backplane in
a modular ethernet switch. Note that an agent may model a
backplane as a single physical entity, which is actually
implemented as multiple discrete physical components (within
a chassis or stack).
The enumeration 'container' is applicable if the physical
entity class is capable of containing one or more removable
physical entities, possibly of different types. For
example, each (empty or full) slot in a chassis will be
modeled as a container. Note that all removable physical
entities should be modeled within a container entity, such
Bierman, et al. Standards Track PAGE 20
RFC 6933 Entity MIB (Version 4) May 2013
as field-replaceable modules, fans, or power supplies. Note
that all known containers should be modeled by the agent,
including empty containers.
The enumeration 'powerSupply' is applicable if the physical
entity class is a power-supplying component.
The enumeration 'fan' is applicable if the physical entity
class is a fan or other heat-reduction component.
The enumeration 'sensor' is applicable if the physical
entity class is some sort of sensor, such as a temperature
sensor within a router chassis.
The enumeration 'module' is applicable if the physical
entity class is some sort of self-contained sub-system. If
the enumeration 'module' is removable, then it should be
modeled within a container entity; otherwise, it should be
modeled directly within another physical entity (e.g., a
chassis or another module).
The enumeration 'port' is applicable if the physical entity
class is some sort of networking port capable of receiving
and/or transmitting networking traffic.
The enumeration 'stack' is applicable if the physical entity
class is some sort of super-container (possibly virtual)
intended to group together multiple chassis entities. A
stack may be realized by a 'virtual' cable, a real
interconnect cable, attached to multiple chassis, or may in
fact be comprised of multiple interconnect cables. A stack
should not be modeled within any other physical entities,
but a stack may be contained within another stack. Only
chassis entities should be contained within a stack.
The enumeration 'cpu' is applicable if the physical entity
class is some sort of central processing unit."
SYNTAX INTEGER {
other(1),
unknown(2),
chassis(3),
backplane(4),
container(5), -- e.g., chassis slot or daughter-card holder
powerSupply(6),
fan(7),
sensor(8),
module(9), -- e.g., plug-in card or daughter-card
port(10),
Bierman, et al. Standards Track PAGE 21
RFC 6933 Entity MIB (Version 4) May 2013
stack(11), -- e.g., stack of multiple chassis entities
cpu(12)
}
-- The Physical Entity Table
entPhysicalTable OBJECT-TYPE
SYNTAX SEQUENCE OF EntPhysicalEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This table contains one row per physical entity. There is
always at least one row for an 'overall' physical entity."
::= { entityPhysical 1 }
entPhysicalEntry OBJECT-TYPE
SYNTAX EntPhysicalEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Information about a particular physical entity.
Each entry provides objects (entPhysicalDescr,
entPhysicalVendorType, and entPhysicalClass) to help an NMS
identify and characterize the entry and objects
(entPhysicalContainedIn and entPhysicalParentRelPos) to help
an NMS relate the particular entry to other entries in this
table."
INDEX { entPhysicalIndex }
::= { entPhysicalTable 1 }
EntPhysicalEntry ::= SEQUENCE {
entPhysicalIndex PhysicalIndex,
entPhysicalDescr SnmpAdminString,
entPhysicalVendorType AutonomousType,
entPhysicalContainedIn PhysicalIndexOrZero,
entPhysicalClass IANAPhysicalClass,
entPhysicalParentRelPos Integer32,
entPhysicalName SnmpAdminString,
entPhysicalHardwareRev SnmpAdminString,
entPhysicalFirmwareRev SnmpAdminString,
entPhysicalSoftwareRev SnmpAdminString,
entPhysicalSerialNum SnmpAdminString,
entPhysicalMfgName SnmpAdminString,
entPhysicalModelName SnmpAdminString,
entPhysicalAlias SnmpAdminString,
entPhysicalAssetID SnmpAdminString,
entPhysicalIsFRU TruthValue,
Bierman, et al. Standards Track PAGE 22
RFC 6933 Entity MIB (Version 4) May 2013
entPhysicalMfgDate DateAndTime,
entPhysicalUris OCTET STRING,
entPhysicalUUID UUIDorZero
}
entPhysicalIndex OBJECT-TYPE
SYNTAX PhysicalIndex
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The index for this entry."
::= { entPhysicalEntry 1 }
entPhysicalDescr OBJECT-TYPE
SYNTAX SnmpAdminString
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"A textual description of physical entity. This object
should contain a string that identifies the manufacturer's
name for the physical entity and should be set to a
distinct value for each version or model of the physical
entity."
::= { entPhysicalEntry 2 }
entPhysicalVendorType OBJECT-TYPE
SYNTAX AutonomousType
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"An indication of the vendor-specific hardware type of the
physical entity. Note that this is different from the
definition of MIB-II's sysObjectID.
An agent should set this object to an enterprise-specific
registration identifier value indicating the specific
equipment type in detail. The associated instance of
entPhysicalClass is used to indicate the general type of
hardware device.
If no vendor-specific registration identifier exists for
this physical entity, or the value is unknown by this agent,
then the value { 0 0 } is returned."
::= { entPhysicalEntry 3 }
Bierman, et al. Standards Track PAGE 23
RFC 6933 Entity MIB (Version 4) May 2013
entPhysicalContainedIn OBJECT-TYPE
SYNTAX PhysicalIndexOrZero
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The value of entPhysicalIndex for the physical entity that
'contains' this physical entity. A value of zero indicates
this physical entity is not contained in any other physical
entity. Note that the set of 'containment' relationships
define a strict hierarchy; that is, recursion is not
allowed.
In the event that a physical entity is contained by more
than one physical entity (e.g., double-wide modules), this
object should identify the containing entity with the lowest
value of entPhysicalIndex."
::= { entPhysicalEntry 4 }
entPhysicalClass OBJECT-TYPE
SYNTAX IANAPhysicalClass
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"An indication of the general hardware type of the physical
entity.
An agent should set this object to the standard enumeration
value that most accurately indicates the general class of
the physical entity, or the primary class if there is more
than one entity.
If no appropriate standard registration identifier exists
for this physical entity, then the value 'other(1)' is
returned. If the value is unknown by this agent, then the
value 'unknown(2)' is returned."
::= { entPhysicalEntry 5 }
entPhysicalParentRelPos OBJECT-TYPE
SYNTAX Integer32 (-1..2147483647)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"An indication of the relative position of this 'child'
component among all its 'sibling' components. Sibling
components are defined as entPhysicalEntries that share the
same instance values of each of the entPhysicalContainedIn
and entPhysicalClass objects.
Bierman, et al. Standards Track PAGE 24
RFC 6933 Entity MIB (Version 4) May 2013
An NMS can use this object to identify the relative ordering
for all sibling components of a particular parent
(identified by the entPhysicalContainedIn instance in each
sibling entry).
If possible, this value should match any external labeling
of the physical component. For example, for a container
(e.g., card slot) labeled as 'slot #3',
entPhysicalParentRelPos should have the value '3'. Note
that the entPhysicalEntry for the module plugged in slot 3
should have an entPhysicalParentRelPos value of '1'.
If the physical position of this component does not match
any external numbering or clearly visible ordering, then
user documentation or other external reference material
should be used to determine the parent-relative position.
If this is not possible, then the agent should assign a
consistent (but possibly arbitrary) ordering to a given set
of 'sibling' components, perhaps based on internal
representation of the components.
If the agent cannot determine the parent-relative position
for some reason, or if the associated value of
entPhysicalContainedIn is '0', then the value '-1' is
returned. Otherwise, a non-negative integer is returned,
indicating the parent-relative position of this physical
entity.
Parent-relative ordering normally starts from '1' and
continues to 'N', where 'N' represents the highest
positioned child entity. However, if the physical entities
(e.g., slots) are labeled from a starting position of zero,
then the first sibling should be associated with an
entPhysicalParentRelPos value of '0'. Note that this
ordering may be sparse or dense, depending on agent
implementation.
The actual values returned are not globally meaningful, as
each 'parent' component may use different numbering
algorithms. The ordering is only meaningful among siblings
of the same parent component.
The agent should retain parent-relative position values
across reboots, either through algorithmic assignment or use
of non-volatile storage."
::= { entPhysicalEntry 6 }
entPhysicalName OBJECT-TYPE
Bierman, et al. Standards Track PAGE 25
RFC 6933 Entity MIB (Version 4) May 2013
SYNTAX SnmpAdminString
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The textual name of the physical entity. The value of this
object should be the name of the component as assigned by
the local device and should be suitable for use in commands
entered at the device's 'console'. This might be a text
name (e.g., 'console') or a simple component number (e.g.,
port or module number, such as '1'), depending on the
physical component naming syntax of the device.
If there is no local name, or if this object is otherwise
not applicable, then this object contains a zero-length
string.
Note that the value of entPhysicalName for two physical
entities will be the same in the event that the console
interface does not distinguish between them, e.g., slot-1
and the card in slot-1."
::= { entPhysicalEntry 7 }
entPhysicalHardwareRev OBJECT-TYPE
SYNTAX SnmpAdminString
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The vendor-specific hardware revision string for the
physical entity. The preferred value is the hardware
revision identifier actually printed on the component itself
(if present).
Note that if revision information is stored internally in a
non-printable (e.g., binary) format, then the agent must
convert such information to a printable format in an
implementation-specific manner.
If no specific hardware revision string is associated with
the physical component, or if this information is unknown to
the agent, then this object will contain a zero-length
string."
::= { entPhysicalEntry 8 }
entPhysicalFirmwareRev OBJECT-TYPE
SYNTAX SnmpAdminString
MAX-ACCESS read-only
STATUS current
Bierman, et al. Standards Track PAGE 26
RFC 6933 Entity MIB (Version 4) May 2013
DESCRIPTION
"The vendor-specific firmware revision string for the
physical entity.
Note that if revision information is stored internally in a
non-printable (e.g., binary) format, then the agent must
convert such information to a printable format in an
implementation-specific manner.
If no specific firmware programs are associated with the
physical component, or if this information is unknown to the
agent, then this object will contain a zero-length string."
::= { entPhysicalEntry 9 }
entPhysicalSoftwareRev OBJECT-TYPE
SYNTAX SnmpAdminString
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The vendor-specific software revision string for the
physical entity.
Note that if revision information is stored internally in a
non-printable (e.g., binary) format, then the agent must
convert such information to a printable format in an
implementation-specific manner.
If no specific software programs are associated with the
physical component, or if this information is unknown to the
agent, then this object will contain a zero-length string."
::= { entPhysicalEntry 10 }
entPhysicalSerialNum OBJECT-TYPE
SYNTAX SnmpAdminString (SIZE (0..32))
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"The vendor-specific serial number string for the physical
entity. The preferred value is the serial number string
actually printed on the component itself (if present).
On the first instantiation of a physical entity, the value
of entPhysicalSerialNum associated with that entity is set
to the correct vendor-assigned serial number, if this
information is available to the agent. If a serial number
is unknown or non-existent, the entPhysicalSerialNum will be
set to a zero-length string instead.
Bierman, et al. Standards Track PAGE 27
RFC 6933 Entity MIB (Version 4) May 2013
Note that implementations that can correctly identify the
serial numbers of all installed physical entities do not
need to provide write access to the entPhysicalSerialNum
object. Agents that cannot provide non-volatile storage
for the entPhysicalSerialNum strings are not required to
implement write access for this object.
Not every physical component will have a serial number, or
even need one. Physical entities for which the associated
value of the entPhysicalIsFRU object is equal to 'false(2)'
(e.g., the repeater ports within a repeater module) do not
need their own unique serial numbers. An agent does not
have to provide write access for such entities and may
return a zero-length string.
If write access is implemented for an instance of
entPhysicalSerialNum and a value is written into the
instance, the agent must retain the supplied value in the
entPhysicalSerialNum instance (associated with the same
physical entity) for as long as that entity remains
instantiated. This includes instantiations across all
re-initializations/reboots of the network management system,
including those resulting in a change of the physical
entity's entPhysicalIndex value."
::= { entPhysicalEntry 11 }
entPhysicalMfgName OBJECT-TYPE
SYNTAX SnmpAdminString
MAX-ACCESS read-only
STATUS current
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
entPhysicalModelName, entPhysicalFirmwareRev,
entPhysicalSoftwareRev, and the entPhysicalSerialNum
objects are only meaningful amongst entPhysicalEntries with
the same value of entPhysicalMfgName.
If the manufacturer name string associated with the physical
component is unknown to the agent, then this object will
contain a zero-length string."
::= { entPhysicalEntry 12 }
Bierman, et al. Standards Track PAGE 28
RFC 6933 Entity MIB (Version 4) May 2013
entPhysicalModelName OBJECT-TYPE
SYNTAX SnmpAdminString
MAX-ACCESS read-only
STATUS current
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 agent, then this object will
contain a zero-length string."
::= { entPhysicalEntry 13 }
entPhysicalAlias OBJECT-TYPE
SYNTAX SnmpAdminString (SIZE (0..32))
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"This object is an 'alias' name for the physical entity, as
specified by a network manager, and provides a non-volatile
'handle' for the physical entity.
On the first instantiation of a physical entity, the value
of entPhysicalAlias associated with that entity is set to
the zero-length string. However, the agent may set the
value to a locally unique default value, instead of a
zero-length string.
If write access is implemented for an instance of
entPhysicalAlias and a value is written into the instance,
the agent must retain the supplied value in the
entPhysicalAlias instance (associated with the same physical
entity) for as long as that entity remains instantiated.
This includes instantiations across all
re-initializations/reboots of the network management system,
including those resulting in a change of the physical
entity's entPhysicalIndex value."
::= { entPhysicalEntry 14 }
entPhysicalAssetID OBJECT-TYPE
SYNTAX SnmpAdminString (SIZE (0..32))
MAX-ACCESS read-write
STATUS current
Bierman, et al. Standards Track PAGE 29
RFC 6933 Entity MIB (Version 4) May 2013
DESCRIPTION
"This object is a user-assigned asset tracking identifier
(as specified by a network manager) for the physical entity
and provides non-volatile storage of this information.
On the first instantiation of a physical entity, the value
of entPhysicalAssetID associated with that entity is set to
the zero-length string.
Not every physical component will have an asset tracking
identifier or even need one. Physical entities for which
the associated value of the entPhysicalIsFRU object is equal
to 'false(2)' (e.g., the repeater ports within a repeater
module) do not need their own unique asset tracking
identifier. An agent does not have to provide write access
for such entities and may instead return a zero-length
string.
If write access is implemented for an instance of
entPhysicalAssetID and a value is written into the
instance, the agent must retain the supplied value in the
entPhysicalAssetID instance (associated with the same
physical entity) for as long as that entity remains
instantiated. This includes instantiations across all
re-initializations/reboots of the network management system,
including those resulting in a change of the physical
entity's entPhysicalIndex value.
If no asset tracking information is associated with the
physical component, then this object will contain a
zero-length string."
::= { entPhysicalEntry 15 }
entPhysicalIsFRU OBJECT-TYPE
SYNTAX TruthValue
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This object indicates whether or not this physical entity
is considered a 'field replaceable unit' by the vendor.
If this object contains the value 'true(1)', then this
entPhysicalEntry identifies a field replaceable unit. For
all entPhysicalEntries that represent components
permanently contained within a field replaceable unit, the
value 'false(2)' should be returned for this object."
::= { entPhysicalEntry 16 }
Bierman, et al. Standards Track PAGE 30
RFC 6933 Entity MIB (Version 4) May 2013
entPhysicalMfgDate OBJECT-TYPE
SYNTAX DateAndTime
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This object contains the date of manufacturing of the
managed entity. If the manufacturing date is unknown or
not supported, the object is not instantiated. The special
value '0000000000000000'H may also be returned in this
case."
::= { entPhysicalEntry 17 }
entPhysicalUris OBJECT-TYPE
SYNTAX OCTET STRING
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"This object contains identification
information about the physical entity. The object
contains URIs; therefore, the syntax of this object
must conform to RFC 3986, Section 3.
Multiple URIs may be present and are separated by white
space characters. Leading and trailing white space
characters are ignored.
If no URI identification information is known
about the physical entity, the object is not
instantiated. A zero-length octet string may also be
returned in this case."
REFERENCE
"RFC 3986, Uniform Resource Identifiers (URI): Generic
Syntax, Section 2, August 1998."
::= { entPhysicalEntry 18 }
entPhysicalUUID OBJECT-TYPE
SYNTAX UUIDorZero
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This object contains identification information
about the physical entity. The object contains a
Universally Unique Identifier, the syntax of this object
must conform to RFC 4122, Section 4.1.
A zero-length octet string is returned if no UUID
information is known."
Bierman, et al. Standards Track PAGE 31
RFC 6933 Entity MIB (Version 4) May 2013
REFERENCE
"RFC 4122, A Universally Unique IDentifier (UUID) URN
Namespace, Section 4.1, July 2005."
::= { entPhysicalEntry 19 }
-- The Logical Entity Table
entLogicalTable OBJECT-TYPE
SYNTAX SEQUENCE OF EntLogicalEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This table contains one row per logical entity. For agents
that implement more than one naming scope, at least one
entry must exist. Agents that instantiate all MIB objects
within a single naming scope are not required to implement
this table."
::= { entityLogical 1 }
entLogicalEntry OBJECT-TYPE
SYNTAX EntLogicalEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Information about a particular logical entity. Entities
may be managed by this agent or other SNMP agents (possibly)
in the same chassis."
INDEX { entLogicalIndex }
::= { entLogicalTable 1 }
EntLogicalEntry ::= SEQUENCE {
entLogicalIndex Integer32,
entLogicalDescr SnmpAdminString,
entLogicalType AutonomousType,
entLogicalCommunity OCTET STRING,
entLogicalTAddress TAddress,
entLogicalTDomain TDomain,
entLogicalContextEngineID SnmpEngineIdOrNone,
entLogicalContextName SnmpAdminString
}
entLogicalIndex OBJECT-TYPE
SYNTAX Integer32 (1..2147483647)
MAX-ACCESS not-accessible
STATUS current
Bierman, et al. Standards Track PAGE 32
RFC 6933 Entity MIB (Version 4) May 2013
DESCRIPTION
"The value of this object uniquely identifies the logical
entity. The value should be a small positive integer; index
values for different logical entities are not necessarily
contiguous."
::= { entLogicalEntry 1 }
entLogicalDescr OBJECT-TYPE
SYNTAX SnmpAdminString
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"A textual description of the logical entity. This object
should contain a string that identifies the manufacturer's
name for the logical entity and should be set to a distinct
value for each version of the logical entity."
::= { entLogicalEntry 2 }
entLogicalType OBJECT-TYPE
SYNTAX AutonomousType
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"An indication of the type of logical entity. This will
typically be the OBJECT IDENTIFIER name of the node in the
SMI's naming hierarchy that represents the major MIB
module, or the majority of the MIB modules, supported by the
logical entity. For example:
a logical entity of a regular host/router -> mib-2
a logical entity of a 802.1d bridge -> dot1dBridge
a logical entity of a 802.3 repeater -> snmpDot3RptrMgmt
If an appropriate node in the SMI's naming hierarchy cannot
be identified, the value 'mib-2' should be used."
::= { entLogicalEntry 3 }
entLogicalCommunity OBJECT-TYPE
SYNTAX OCTET STRING (SIZE (0..255))
MAX-ACCESS read-only
STATUS deprecated
DESCRIPTION
"An SNMPv1 or SNMPv2c community string, which can be used to
access detailed management information for this logical
entity. The agent should allow read access with this
community string (to an appropriate subset of all managed
objects) and may also return a community string based on the
privileges of the request used to read this object. Note
that an agent may return a community string with read-only
privileges, even if this object is accessed with a
Bierman, et al. Standards Track PAGE 33
RFC 6933 Entity MIB (Version 4) May 2013
read-write community string. However, the agent must take
care not to return a community string that 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 if no community string with
suitable access rights can be returned for a particular SNMP
request.
Note that this object is deprecated. Agents that 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 contain the IP-address in network-byte order, and
the last 2 contain the UDP port in network-byte order.
Consult RFC 3417 for further information on snmpUDPDomain."
Bierman, et al. Standards Track PAGE 34
RFC 6933 Entity MIB (Version 4) May 2013
REFERENCE
"Transport Mappings for the Simple Network Management
Protocol (SNMP), STD 62, RFC 3417."
::= { 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
RFC 3417."
REFERENCE
"Transport Mappings for the Simple Network Management
Protocol (SNMP), STD 62, RFC 3417."
::= { 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
Bierman, et al. Standards Track PAGE 35
RFC 6933 Entity MIB (Version 4) May 2013
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 that
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 (because
the entPhysicalContainedIn hierarchy can provide the same
information). On the other hand, if more than one bridge
were utilizing ports on this module, then mappings between
each bridge and the ports it used would be appropriate.
Bierman, et al. Standards Track PAGE 36
RFC 6933 Entity MIB (Version 4) May 2013
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
MIB modules 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 entities and physical components 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
Bierman, et al. Standards Track PAGE 37
RFC 6933 Entity MIB (Version 4) May 2013
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 binding between a
logical entity/physical component pair and an external
identifier. 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 that 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 Integer32,
entAliasMappingIdentifier RowPointer
}
entAliasLogicalIndexOrZero OBJECT-TYPE
SYNTAX Integer32 (0..2147483647)
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The value of this object identifies the logical entity
that 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 that does not have
an explicit entry in this table for a particular
entPhysicalIndex/entAliasMappingIdentifier pair.
Bierman, et al. Standards Track PAGE 38
RFC 6933 Entity MIB (Version 4) May 2013
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 zero-indexed entries. 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.
Because only physical ports are modeled in this table, only
entries that 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
Bierman, et al. Standards Track PAGE 39
RFC 6933 Entity MIB (Version 4) May 2013
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 that 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."
Bierman, et al. Standards Track PAGE 40
RFC 6933 Entity MIB (Version 4) May 2013
::= { 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.
Bierman, et al. Standards Track PAGE 41
RFC 6933 Entity MIB (Version 4) May 2013
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 that implement
version 1 of the Entity MIB."
MODULE -- this module
MANDATORY-GROUPS {
entityPhysicalGroup,
entityLogicalGroup,
entityMappingGroup,
entityGeneralGroup,
entityNotificationsGroup
}
::= { entityCompliances 1 }
entity2Compliance MODULE-COMPLIANCE
STATUS deprecated
DESCRIPTION
"The compliance statement for SNMP entities that 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
that model all MIB object instances within a single naming
scope."
Bierman, et al. Standards Track PAGE 42
RFC 6933 Entity MIB (Version 4) May 2013
GROUP entityMappingGroup
DESCRIPTION
"Implementation of the entPhysicalContainsTable is mandatory
for all agents. Implementation of the entLPMappingTable and
entAliasMappingTables are not mandatory for agents that
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 that
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 that 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 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 that
cannot provide non-volatile storage for NMS-assigned asset
identifiers.
Write access is not required for physical entities for which
the associated value of the entPhysicalIsFRU object is equal
to 'false(2)'."
OBJECT entPhysicalClass
SYNTAX INTEGER {
other(1),
Bierman, et al. Standards Track PAGE 43
RFC 6933 Entity MIB (Version 4) May 2013
unknown(2),
chassis(3),
backplane(4),
container(5),
powerSupply(6),
fan(7),
sensor(8),
module(9),
port(10),
stack(11)
}
DESCRIPTION
"Implementation of the 'cpu(12)' enumeration is not
required."
::= { entityCompliances 2 }
entity3Compliance MODULE-COMPLIANCE
STATUS deprecated
DESCRIPTION
"The compliance statement for SNMP entities that implement
version 3 of the Entity MIB."
MODULE -- this module
MANDATORY-GROUPS {
entityPhysicalGroup,
entityPhysical2Group,
entityPhysical3Group,
entityGeneralGroup,
entityNotificationsGroup
}
GROUP entityLogical2Group
DESCRIPTION
"Implementation of this group is not mandatory for agents
that 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 that
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
Bierman, et al. Standards Track PAGE 44
RFC 6933 Entity MIB (Version 4) May 2013
DESCRIPTION
"Read and write access is not required for agents that
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 that 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
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 that
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 3 }
entity4Compliance MODULE-COMPLIANCE
STATUS current
DESCRIPTION
"The compliance statement for SNMP entities that implement
the full version 4 (full compliance) of the Entity MIB."
MODULE -- this module
MANDATORY-GROUPS {
entityPhysicalGroup,
entityPhysical2Group,
entityPhysical3Group,
entityGeneralGroup,
entityNotificationsGroup,
entityPhysical4Group
}
GROUP entityLogical2Group
Bierman, et al. Standards Track PAGE 45
RFC 6933 Entity MIB (Version 4) May 2013
DESCRIPTION
"Implementation of this group is not mandatory for agents
that 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 that
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 that
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 that 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
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 that
cannot provide non-volatile storage for NMS-assigned asset
identifiers.
Bierman, et al. Standards Track PAGE 46
RFC 6933 Entity MIB (Version 4) May 2013
Write access is not required for physical entities for which
the associated value of entPhysicalIsFRU is equal to
'false(2)'."
::= { entityCompliances 4 }
entity4CRCompliance MODULE-COMPLIANCE
STATUS current
DESCRIPTION
"The compliance statement for SNMP entities that implement
version 4 of the Entity MIB on devices with constrained
resources."
MODULE -- this module
MANDATORY-GROUPS {
entityPhysicalCRGroup,
entityPhysical4Group
}
::= { entityCompliances 5 }
-- MIB groupings
entityPhysicalGroup OBJECT-GROUP
OBJECTS {
entPhysicalDescr,
entPhysicalVendorType,
entPhysicalContainedIn,
entPhysicalClass,
entPhysicalParentRelPos,
entPhysicalName
}
STATUS current
DESCRIPTION
"The collection of objects 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
Bierman, et al. Standards Track PAGE 47
RFC 6933 Entity MIB (Version 4) May 2013
DESCRIPTION
"The collection of objects 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 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 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,
Bierman, et al. Standards Track PAGE 48
RFC 6933 Entity MIB (Version 4) May 2013
entPhysicalAssetID,
entPhysicalIsFRU
}
STATUS current
DESCRIPTION
"The collection of objects 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 used to represent the
list of logical entities for which a single SNMP entity
provides management information."
::= { entityGroups 7 }
entityPhysical3Group OBJECT-GROUP
OBJECTS {
entPhysicalMfgDate,
entPhysicalUris
}
STATUS current
DESCRIPTION
"The collection of objects used to represent physical
system components for which a single agent provides
management information. This group augments the objects
contained in the entityPhysicalGroup."
::= { entityGroups 8 }
entityPhysical4Group OBJECT-GROUP
OBJECTS {
entPhysicalUUID
}
STATUS current
Bierman, et al. Standards Track PAGE 49
RFC 6933 Entity MIB (Version 4) May 2013
DESCRIPTION
"The collection of objects used to represent physical
system components for which a single agent provides
management information. This group augments the objects
contained in the entityPhysicalGroup and
entityPhysicalCRGroup."
::= { entityGroups 9 }
entityPhysicalCRGroup OBJECT-GROUP
OBJECTS {
entPhysicalClass,
entPhysicalName
}
STATUS current
DESCRIPTION
"The collection of objects used to represent physical
system components for constrained resourced devices,
for which a single agent provides management
information."
::= { entityGroups 10 }
END
3.2. IANA-ENTITY-MIB
IANA-ENTITY-MIB DEFINITIONS ::= BEGIN
IMPORTS
MODULE-IDENTITY, mib-2
FROM SNMPv2-SMI -- RFC 2578
TEXTUAL-CONVENTION
FROM SNMPv2-TC -- RFC 2579
;
ianaEntityMIB MODULE-IDENTITY
LAST-UPDATED "201304050000Z" -- April 5, 2013
ORGANIZATION "IANA"
CONTACT-INFO
"Internet Assigned Numbers Authority
Postal: ICANN
12025 Waterfront Drive, Suite 300
Los Angeles, CA 90094-2536
Phone: +1-310-301-5800
EMail: iana@iana.org"
Bierman, et al. Standards Track PAGE 50
RFC 6933 Entity MIB (Version 4) May 2013
DESCRIPTION
"This MIB module defines a TEXTUAL-CONVENTION that provides
an indication of the general hardware type of a particular
physical entity.
Copyright (c) 2013 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).
The initial version of this MIB module was published in
RFC 6933; for full legal notices see the RFC itself."
REVISION "201304050000Z" -- April 5, 2013
DESCRIPTION "Initial version of this MIB as published in
RFC 6933."
::= { mib-2 216 }
-- Textual Conventions
IANAPhysicalClass ::= TEXTUAL-CONVENTION
STATUS current
DESCRIPTION
"An enumerated value that provides an indication of the
general hardware type of a particular physical entity.
There are no restrictions as to the number of
entPhysicalEntries of each entPhysicalClass, which must
be instantiated by an agent.
The enumeration 'other' is applicable if the physical
entity class is known but does not match any of the
supported values.
The enumeration 'unknown' is applicable if the physical
entity class is unknown to the agent.
The enumeration 'chassis' is applicable if the physical
entity class is an overall container for networking
equipment. Any class of physical entity, except a stack,
may be contained within a chassis; a chassis may only
be contained within a stack.
Bierman, et al. Standards Track PAGE 51
RFC 6933 Entity MIB (Version 4) May 2013
The enumeration 'backplane' is applicable if the physical
entity class is some sort of device for aggregating and
forwarding networking traffic, such as a shared
backplane in a modular ethernet switch. Note that an
agent may model a backplane as a single physical entity,
which is actually implemented as multiple discrete
physical components (within a chassis or stack).
The enumeration 'container' is applicable if the
physical entity class is capable of containing one or
more removable physical entities, possibly of different
types. For example, each (empty or full) slot in a
chassis will be modeled as a container. Note that all
removable physical entities should be modeled within
a container entity, such as field-replaceable modules,
fans, or power supplies. Note that all known containers
should be modeled by the agent, including empty
containers.
The enumeration 'powerSupply' is applicable if the
physical entity class is a power-supplying component.
The enumeration 'fan' is applicable if the physical
entity class is a fan or other heat-reduction component.
The enumeration 'sensor' is applicable if the physical
entity class is some sort of sensor, such as a
temperature sensor within a router chassis.
The enumeration 'module' is applicable if the physical
entity class is some sort of self-contained sub-system.
If the enumeration 'module' is removable, then it should
be modeled within a container entity; otherwise, it
should be modeled directly within another physical
entity (e.g., a chassis or another module).
The enumeration 'port' is applicable if the physical
entity class is some sort of networking port, capable
of receiving and/or transmitting networking traffic.
The enumeration 'stack' is applicable if the physical
entity class is some sort of super-container (possibly
virtual) intended to group together multiple chassis
entities. A stack may be realized by a 'virtual' cable,
a real interconnect cable attached to multiple chassis,
or multiple interconnect cables. A stack should not be
Bierman, et al. Standards Track PAGE 52
RFC 6933 Entity MIB (Version 4) May 2013
modeled within any other physical entities, but a stack
may be contained within another stack. Only chassis
entities should be contained within a stack.
The enumeration 'cpu' is applicable if the physical
entity class is some sort of central processing unit.
The enumeration 'energyObject' is applicable if the
physical entity is some sort of energy object, i.e.,
a piece of equipment that is part of or attached to
a communications network that is monitored, controlled,
or aids in the management of another device for Energy
Management.
The enumeration 'battery' is applicable if the physical
entity class is some sort of battery."
SYNTAX INTEGER {
other(1),
unknown(2),
chassis(3),
backplane(4),
container(5), -- e.g., chassis slot or daughter-card holder
powerSupply(6),
fan(7),
sensor(8),
module(9), -- e.g., plug-in card or daughter-card
port(10),
stack(11), -- e.g., stack of multiple chassis entities
cpu(12),
energyObject(13),
battery (14)
}
END
3.3. UUID-TC-MIB
UUID-TC-MIB DEFINITIONS ::= BEGIN
IMPORTS
MODULE-IDENTITY, mib-2
FROM SNMPv2-SMI -- RFC 2578
TEXTUAL-CONVENTION
FROM SNMPv2-TC -- RFC 2579
;
uuidTCMIB MODULE-IDENTITY
Bierman, et al. Standards Track PAGE 53
RFC 6933 Entity MIB (Version 4) May 2013
LAST-UPDATED "201304050000Z" -- April 5, 2013
ORGANIZATION "IETF Energy Management Working Group"
CONTACT-INFO "WG Email: eman@ietf.org
Mailing list subscription info:
http://www.ietf.org/mailman/listinfo/eman
Dan Romascanu
Avaya
Park Atidim, Bldg. #3
Tel Aviv, 61581
Israel
Phone: +972-3-6458414
Email: dromasca@avaya.com
Juergen Quittek
NEC Europe Ltd.
Network Research Division
Kurfuersten-Anlage 36
Heidelberg 69115
Germany
Phone: +49 6221 4342-115
Email: quittek@neclab.eu
Mouli Chandramouli
Cisco Systems, Inc.
Sarjapur Outer Ring Road
Bangalore 560103
India
Phone: +91 80 4429 2409
Email: moulchan@cisco.com"
DESCRIPTION
"This MIB module defines TEXTUAL-CONVENTIONs
representing Universally Unique IDentifiers
(UUIDs).
Copyright (c) 2013 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)."
Bierman, et al. Standards Track PAGE 54
RFC 6933 Entity MIB (Version 4) May 2013
REVISION "201304050000Z" -- April 5, 2013
DESCRIPTION "Initial version of this MIB as published in
RFC 6933."
::= { mib-2 217 }
-- Textual Conventions
UUID ::= TEXTUAL-CONVENTION
DISPLAY-HINT "4x-2x-2x-1x1x-6x"
STATUS current
DESCRIPTION
"Universally Unique Identifier information. The syntax must
conform to RFC 4122, Section 4.1."
SYNTAX OCTET STRING (SIZE (16))
UUIDorZero ::= TEXTUAL-CONVENTION
DISPLAY-HINT "4x-2x-2x-1x1x-6x"
STATUS current
DESCRIPTION
"Universally Unique Identifier information. The syntax must
conform to RFC 4122, Section 4.1.
The semantics of the value zero-length OCTET STRING are
object-specific and must therefore be defined as part of
the description of any object that uses this syntax."
SYNTAX OCTET STRING (SIZE (0|16))
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
The first example is 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:
Bierman, et al. Standards Track PAGE 55
RFC 6933 Entity MIB (Version 4) May 2013
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)
entPhysicalMfgDate.1 == '2002-5-26,13:30:30.0,-4:0'
entPhysicalUris.1 == 'URN:CLEI:CNME120ARA'
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)
entPhysicalMfgDate.2 == '2002-7-26,12:22:12.0,-4:0'
entPhysicalUris.2 == 'URN:CLEI:CNME123ARA'
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 == ''
Bierman, et al. Standards Track PAGE 56
RFC 6933 Entity MIB (Version 4) May 2013
entPhysicalMfgName.3 == 'Acme'
entPhysicalModelName.3 == 'AA'
entPhysicalAlias.3 == ''
entPhysicalAssetID.3 == ''
entPhysicalIsFRU.3 == false(2)
entPhysicalMfgDate.3 == '2002-7-26,12:12:12.0,-4:0'
entPhysicalUris.3 == 'URN:CLEI:CNME123ARA'
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)
entPhysicalMfgDate.4 == '2003-7-18,13:30:30.0,-4:0'
entPhysicalUris.4 == 'URN:CLEI:CNRU123CAA'
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)
entPhysicalMfgDate.5 == '2003-7-18,14:20:22.0,-4:0'
entPhysicalUris.5 == 'URN:CLEI:CNMES23ARA'
entPhysicalDescr.6 == 'Acme Ethernet-100 Port'
entPhysicalVendorType.6 == acmeProducts.portTypes.2
Bierman, et al. Standards Track PAGE 57
RFC 6933 Entity MIB (Version 4) May 2013
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)
entPhysicalMfgDate.6 == '2003-7-19,10:15:15.0,-4:0'
entPhysicalUris.6 == 'URN:CLEI:CNMES23ARA'
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)
Bierman, et al. Standards Track PAGE 58
RFC 6933 Entity MIB (Version 4) May 2013
entPhysicalMfgDate.8 == '2002-5-26,13:30:15.0,-4:0'
entPhysicalUris.8 == 'URN:CLEI:CNRT321MAA'
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)
entPhysicalMfgDate.10 == '2002-7-26,13:30:15.0,-4:0'
entPhysicalUris.10 == 'URN:CLEI:CNMES23ARA'
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'
Bierman, et al. Standards Track PAGE 59
RFC 6933 Entity MIB (Version 4) May 2013
entPhysicalModelName.11 == 'FE-100'
entPhysicalAlias.11 == ''
entPhysicalAssetID.11 == ''
entPhysicalIsFRU.11 == false(2)
entPhysicalMfgDate.11 == '2002-8-16,15:35:15.0,-4:0'
entPhysicalUris.11 == 'URN:CLEI:CNMES23ARA'
Logical entities -- entLogicalTable; no SNMPv3 support
2 OSPF instances:
entLogicalDescr.1 == 'Acme OSPF v1.1'
entLogicalType.1 == ospf
entLogicalCommunity.1 == 'public-ospf1'
entLogicalTAddress.1 == 192.0.2.1:161
entLogicalTDomain.1 == snmpUDPDomain
entLogicalContextEngineID.1 == ''
entLogicalContextName.1 == ''
entLogicalDescr.2 == 'Acme OSPF v1.1'
entLogicalType.2 == ospf
entLogicalCommunity.2 == 'public-ospf2'
entLogicalTAddress.2 == 192.0.2.1:161
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 == 192.0.2.1:161
entLogicalTDomain.3 == snmpUDPDomain
entLogicalContextEngineID.3 == ''
entLogicalContextName.3 == ''
entLogicalDescr.4 == 'Acme Bridge v2.1.1'
entLogicalType.4 == dot1dBridge
entLogicalCommunity.4 == 'public-bridge2'
entLogicalTAddress.4 == 192.0.2.1:161
entLogicalTDomain.4 == snmpUDPDomain
entLogicalContextEngineID.4 == ''
entLogicalContextName.4 == ''
Logical to Physical Mappings:
1st OSPF instance: uses module 1-port 1
entLPPhysicalIndex.1.5 == 5
Bierman, et al. Standards Track PAGE 60
RFC 6933 Entity MIB (Version 4) May 2013
2nd OSPF instance: uses module 2-port 1
entLPPhysicalIndex.2.9 == 9
1st bridge group: uses module 1, all ports
Note that these mappings are included in the table because
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;
(Bridge-1 uses ifIndex values 101 - 103 and Bridge-2 uses
ifIndex values 204-206.)
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.9.4 == ifIndex.204
entAliasMappingIdentifier.10.0 == ifIndex.5
entAliasMappingIdentifier.10.4 == ifIndex.205
entAliasMappingIdentifier.11.0 == ifIndex.6
entAliasMappingIdentifier.11.4 == ifIndex.206
Bierman, et al. Standards Track PAGE 61
RFC 6933 Entity MIB (Version 4) May 2013
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.8.11 == 11
4.2. Repeaters
The second example is 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] rather than the new Repeater MIB [RFC 2108]. The new
version contains an object called 'rptrPortRptrId', which should be
used to identify repeater port groupings, rather than using 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'
Bierman, et al. Standards Track PAGE 62
RFC 6933 Entity MIB (Version 4) May 2013
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'
Bierman, et al. Standards Track PAGE 63
RFC 6933 Entity MIB (Version 4) May 2013
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'
Bierman, et al. Standards Track PAGE 64
RFC 6933 Entity MIB (Version 4) May 2013
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 == ''
Bierman, et al. Standards Track PAGE 65
RFC 6933 Entity MIB (Version 4) May 2013
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'
Bierman, et al. Standards Track PAGE 66
RFC 6933 Entity MIB (Version 4) May 2013
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 == 192.0.2.1:161
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 == 192.0.2.1:161
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
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RFC 6933 Entity MIB (Version 4) May 2013
Note that a mapping to the module is not included,
because 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
Note that in this example, container 3 is empty.
module 1 has 4 ports:
entPhysicalChildIndex.7.8 == 8
entPhysicalChildIndex.7.9 == 9
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RFC 6933 Entity MIB (Version 4) May 2013
entPhysicalChildIndex.7.10 == 10
entPhysicalChildIndex.7.11 == 11
module 2 has 2 ports:
entPhysicalChildIndex.12.13 == 13
entPhysicalChildIndex.12.14 == 14
4.3. EMAN Example
As an example, to illustrate the use of the MIB objects introduced
with Energy Management (EMAN) applications, consider a router that
has 16 slots with line cards. An example of the entPhysicalTable is
given for 3 components of the router, a chassis, a slot, and a line
card in that slot. The chassis contains the slot, and the slot
contains the line card.
entPhysicalDescr.1 == 'ACME Series 16 Slots'
entPhysicalVendorType.1 == acmeProducts.chassisTypes.1
entPhysicalContainedIn.1 == 0
entPhysicalClass.1 == chassis(3)
entPhysicalParentRelPos.1 == -1
entPhysicalName.1 == 'Router 0 Chassis'
entPhysicalHardwareRev.1 == ''
entPhysicalSoftwareRev.1 == ''
entPhysicalFirmwareRev.1 == ''
entPhysicalSerialNum.1 == 'abcd1234'
entPhysicalMfgName.1 == 'ACME'
entPhysicalModelName.1 == 'ACME-16-LCC'
entPhysicalAlias.1 == ''
entPhysicalAssetID.1 == ''
entPhysicalIsFRU.1 == true(1)
entPhysicalMfgDate.1 == '2008-7-28,13:30:30.0,-4:0'
entPhysicalUris.1 == 'urn:f81d4fae-7dec-11d0-a765-00a0c91e6bf6'
entPhysicalUUID.1 == 'f81d4fae-7dec-11d0-a765-00a0c91e6bf6'
entPhysicalDescr.2 == 'ACME Line Card Slot'
entPhysicalVendorType.2 == acmeProducts.slotTypes.1
entPhysicalContainedIn.2 == 1
entPhysicalClass.2 = container(5)
entPhysicalParentRelPos.2 == 6
entPhysicalName.2 == 'Slot 6'
entPhysicalHardwareRev.2 == ''
entPhysicalFirmwareRev.2 == ''
entPhysicalSoftwareRev.2 == ''
entPhysicalSerialNum.2 == ''
entPhysicalMfgName.2 == 'ACME'
entPhysicalModelName.2 == ''
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RFC 6933 Entity MIB (Version 4) May 2013
entPhysicalAlias.2 == ''
entPhysicalAssetID.2 == ''
entPhysicalIsFRU.2 == false(2)
entPhysicalUris.2 == ''urn:7dc53df5-703e-49b3-8670-b1c468f47f1f'
entPhysicalUUID.2 == '7dc53df5-703e-49b3-8670-b1c468f47f1f'
entPhysicalDescr.4 == 'ACME Series1 Line Card'
entPhysicalVendorType.4 == acmeProducts.moduleTypes.14
entPhysicalContainedIn.4 == 2
entPhysicalClass.4 == module(9)
entPhysicalParentRelPos.4 == 0
entPhysicalName.4 == 'Series1 Linecard'
entPhysicalHardwareRev.4 == ''
entPhysicalFirmwareRev.4 == ''
entPhysicalSoftwareRev.4 == ''
entPhysicalSerialNum.4 == ''
entPhysicalMfgName.4 == 'ACME'
entPhysicalModelName.4 == ''
entPhysicalAlias.4 == ''
entPhysicalAssetID.4 == ''
entPhysicalIsFRU.4 == true(1)
entPhysicalUris.4 == 'urn:01c47915-4777-11d8-bc70-0090272ff725'
entPhysicalUUID.4 == '01c47915-4777-11d8-bc70-0090272ff725'
5. Security Considerations
There are a number of management objects defined in these MIB modules
with 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. These are the tables and objects and their
sensitivity/vulnerability:
entPhysicalSerialNum
entPhysicalAlias
entPhysicalAssetID
entPhysicalUris
These objects contain information about the physical entities within
a managed system, which may be used to identify the serial number,
identification of assets and managed components, and handling of the
managed objects. Their mis-configuration or disclosure may reveal
sensitive information on assets, perturb the management of entities,
or cause privacy issues if they allow tracking of values that are
personally identifying.
Bierman, et al. Standards Track PAGE 70
RFC 6933 Entity MIB (Version 4) May 2013
Some of the readable objects in these MIB modules (i.e., objects with
a MAX-ACCESS other than not-accessible) may be considered sensitive
or vulnerable in some network environments. It is thus important to
control even GET and/or NOTIFY access to these objects and possibly
to even encrypt the values of these objects when sending them over
the network via SNMP. These are the tables and objects and their
sensitivity/vulnerability:
entPhysicalDescr
entPhysicalVendorType
entPhysicalHardwareRev
entPhysicalFirmwareRev
entPhysicalSoftwareRev
entPhysicalMfgName
entPhysicalModelName
entPhysicalUUID
These objects expose information about the physical entities within a
managed system, which may be used to identify the vendor, model,
version, and specific device-identification information of each
system component.
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 entities 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.
Bierman, et al. Standards Track PAGE 71
RFC 6933 Entity MIB (Version 4) May 2013
SNMP versions prior to SNMPv3 did not include adequate security.
Even if the network itself is secure (for example by using IPsec),
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 these
MIB modules.
Implementations SHOULD provide the security features described by the
SNMPv3 framework (see [RFC 3410]), and implementations claiming
compliance to the SNMPv3 standard MUST include full support for
authentication and privacy via the User-based Security Model (USM)
[RFC 3414] with the AES cipher algorithm [RFC 3826]. Implementations
MAY also provide support for the Transport Security Model (TSM)
[RFC 5591] in combination with a secure transport such as SSH
[RFC 5592] or TLS/DTLS [RFC 6353].
Further, deployment of SNMP versions prior to SNMPv3 is NOT
RECOMMENDED. Instead, it is RECOMMENDED to deploy SNMPv3 and to
enable cryptographic security. It is then a customer/operator
responsibility to ensure that the SNMP entity giving access to an
instance of these MIB modules 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.
6. IANA Considerations
This document defines the first version of the IANA-maintained
IANA-ENTITY-MIB module, which allows new physical classes to be added
to the enumeration in IANAPhysicalClass. An Expert Review, as
defined in RFC 5226 [RFC 5226], is REQUIRED for each modification.
The MIB module in this document uses the following IANA-assigned
OBJECT IDENTIFIER values recorded in the SMI Numbers registry:
Descriptor OBJECT IDENTIFIER value
---------- -----------------------
entityMIB { mib-2 47 }
IANA has allocated two OBJECT IDENTIFIERS under mib-2 for:
Descriptor OBJECT IDENTIFIER value
---------- -----------------------
ianaEntityMIB { mib-2 216 }
uuidTCMIB { mib-2 217 }
Bierman, et al. Standards Track PAGE 72
RFC 6933 Entity MIB (Version 4) May 2013
7. Acknowledgements
The first three versions of RFCs on the ENTITY MIB modules were
authored by A. Bierman and K. McCloghrie. The authors would like to
thank A. Bierman and K. McCloghrie for the earlier versions of the
ENTITY MIB.
The motivation for the extension to RFC 4133 stems from the
requirements of the EMAN WG of the IETF.
The authors also thank Juergen Schoenwaelder for his review and
comments for improving this document.
8. References
8.1. Normative References
[RFC 2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC 2578] McCloghrie, K., Perkins, D., and J. Schoenwaelder,
"Structure of Management Information Version 2
(SMIv2)", STD 58, RFC 2578, April 1999.
[RFC 2579] McCloghrie, K., Ed., Perkins, D., Ed., and J.
Schoenwaelder, Ed., "Textual Conventions for SMIv2",
STD 58, RFC 2579, April 1999.
[RFC 2580] McCloghrie, K., Ed., Perkins, D., Ed., and J.
Schoenwaelder, Ed., "Conformance Statements for SMIv2",
STD 58, RFC 2580, April 1999.
[RFC 3411] Harrington, D., Presuhn, R., and B. Wijnen, "An
Architecture for Describing Simple Network Management
Protocol (SNMP) Management Frameworks", STD 62, RFC
3411, December 2002.
[RFC 3414] Blumenthal, U. and B. Wijnen, "User-based Security
Model (USM) for version 3 of the Simple Network
Management Protocol (SNMPv3)", STD 62, RFC 3414,
December 2002.
[RFC 3826] Blumenthal, U., Maino, F., and K. McCloghrie, "The
Advanced Encryption Standard (AES) Cipher Algorithm in
the SNMP User-based Security Model", RFC 3826, June
2004.
Bierman, et al. Standards Track PAGE 73
RFC 6933 Entity MIB (Version 4) May 2013
[RFC 3986] Berners-Lee, T., Fielding, R., and L. Masinter,
"Uniform Resource Identifier (URI): Generic Syntax",
STD 66, RFC 3986, January 2005.
[RFC 4122] Leach, P., Mealling, M., and R. Salz, "A Universally
Unique IDentifier (UUID) URN Namespace", RFC 4122, July
2005.
[RFC 5226] Narten, T. and H. Alvestrand, "Guidelines for Writing
an IANA Considerations Section in RFCs", BCP 26, RFC
5226, May 2008.
[RFC 5591] Harrington, D. and W. Hardaker, "Transport Security
Model for the Simple Network Management Protocol
(SNMP)", RFC 5591, June 2009.
[RFC 5592] Harrington, D., Salowey, J., and W. Hardaker, "Secure
Shell Transport Model for the Simple Network Management
Protocol (SNMP)", RFC 5592, June 2009.
[RFC 6353] Hardaker, W., "Transport Layer Security (TLS) Transport
Model for the Simple Network Management Protocol
(SNMP)", RFC 6353, July 2011.
8.2. Informative References
[RFC 1157] Case, J., Fedor, M., Schoffstall, M., and J. Davin,
"Simple Network Management Protocol (SNMP)", RFC 1157,
May 1990.
[RFC 1516] McMaster, D. and K. McCloghrie, "Definitions of Managed
Objects for IEEE 802.3 Repeater Devices", RFC 1516,
September 1993.
[RFC 2108] 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.
[RFC 2037] McCloghrie, K. and A. Bierman, "Entity MIB using
SMIv2", RFC 2037, October 1996.
[RFC 2737] McCloghrie, K. and A. Bierman, "Entity MIB (Version
2)", RFC 2737, December 1999.
[RFC 2863] McCloghrie, K. and F. Kastenholz, "The Interfaces Group
MIB", RFC 2863, June 2000.
Bierman, et al. Standards Track PAGE 74
RFC 6933 Entity MIB (Version 4) May 2013
[RFC 3406] Daigle, L., van Gulik, D., Iannella, R., and P.
Faltstrom, "Uniform Resource Names (URN) Namespace
Definition Mechanisms", BCP 66, RFC 3406, October 2002.
[RFC 3410] Case, J., Mundy, R., Partain, D., and B. Stewart,
"Introduction and Applicability Statements for
Internet-Standard Management Framework", RFC 3410,
December 2002.
[RFC 4133] Bierman, A. and K. McCloghrie, "Entity MIB (Version
3)", RFC 4133, August 2005.
[RFC 4152] Tesink, K. and R. Fox, "A Uniform Resource Name (URN)
Namespace for the Common Language Equipment Identifier
(CLEI) Code", RFC 4152, August 2005.
[RFC 4188] Norseth, K., Ed., and E. Bell, Ed., "Definitions of
Managed Objects for Bridges", RFC 4188, September 2005.
[T1.213] ATIS T1.213-2001, "Coded Identification of Equipment
Entities in the North American Telecommunications
System for Information Exchange", 2001, <www.ansi.org>.
[T1.213a] ATIS T1.213a, "Supplement to T1.213-2001, Coded
Identification of Equipment Entities in the North
American Telecommunications System for Information
Exchange, to Correct the Representation of the Basic
Code in Figure B.1", 2001, <www.ansi.org>.
Bierman, et al. Standards Track PAGE 75
RFC 6933 Entity MIB (Version 4) May 2013
Authors' Addresses
Andy Bierman
YumaWorks, Inc.
274 Redwood Shores Parkway, #133
Redwood City, CA 94065
USA
Phone: +1 408-716-0466
EMail: andy@yumaworks.com
Dan Romascanu
Avaya
Park Atidim, Bldg. #3
Tel Aviv, 61581
Israel
Phone: +972-3-6458414
EMail: dromasca@avaya.com
Juergen Quittek
NEC Europe Ltd.
Network Research Division
Kurfuersten-Anlage 36
Heidelberg 69115
Germany
Phone: +49 6221 4342-115
EMail: quittek@neclab.eu
Mouli Chandramouli
Cisco Systems, Inc.
Sarjapur Outer Ring Road
Bangalore 560103
India
Phone: +91 80 4429 2409
EMail: moulchan@cisco.com
Bierman, et al. Standards Track PAGE 76
RFC TOTAL SIZE: 165278 bytes
PUBLICATION DATE: Friday, May 24th, 2013
LEGAL RIGHTS: The IETF Trust (see BCP 78)
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