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- Network Working Group K. McCloghrie
- Request for Comments: 2037 A. Bierman
- Category: Standards Track Cisco Systems
- October 1996
-
-
- Entity MIB using SMIv2
-
- Status of this Memo
-
- This document specifies an Internet standards track protocol for the
- Internet community, and requests discussion and suggestions for
- improvements. Please refer to the current edition of the "Internet
- Official Protocol Standards" (STD 1) for the standardization state
- and status of this protocol. Distribution of this memo is unlimited.
-
- Table of Contents
-
- 1. Introduction .............................................. 2
- 2. The SNMP Network Management Framework ..................... 2
- 2.1 Object Definitions ....................................... 2
- 3. Overview .................................................. 3
- 3.1 Terms .................................................... 4
- 3.2 Relationship to Community Strings ........................ 5
- 3.3 Relationship to Proxy Mechanisms ......................... 5
- 3.4 Relationship to a Chassis MIB ............................ 5
- 3.5 Relationship to the Interfaces MIB ....................... 6
- 3.6 Relationship to the Other MIBs ........................... 6
- 3.7 Relationship to Naming Scopes ............................ 6
- 3.8 Multiple Instances of the Entity MIB ..................... 7
- 3.9 Re-Configuration of Entities ............................. 7
- 3.10 MIB Structure ........................................... 7
- 3.10.1 entityPhysical Group .................................. 8
- 3.10.2 entityLogical Group ................................... 8
- 3.10.3 entityMapping Group ................................... 8
- 3.10.4 entityGeneral Group ................................... 9
- 3.10.5 entityNotifications Group ............................. 9
- 3.11 Multiple Agents ......................................... 9
- 4. Definitions ............................................... 10
- 5. Usage Examples ............................................ 26
- 5.1 Router/Bridge ............................................ 26
- 5.2 Repeaters ................................................ 30
- 6. Acknowledgements .......................................... 33
- 7. References ................................................ 34
- 8. Security Considerations ................................... 35
- 9. Authors' Addresses ........................................ 35
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- McCloghrie & Bierman Standards Track [Page 1]
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- RFC 2037 Entity MIB using SMIv2 October 1996
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- 1. Introduction
-
- 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 SNMP
- agent.
-
- 2. The SNMP Network Management Framework
-
- The SNMP Network Management Framework presently consists of three
- major components. They are:
-
- o the SMI, described in RFC 1902 [1], - the mechanisms used for
- describing and naming objects for the purpose of management.
-
- o the MIB-II, STD 17, RFC 1213 [2], - the core set of managed
- objects for the Internet suite of protocols.
-
- o the protocol, RFC 1157 [6] and/or RFC 1905 [4], - the protocol
- for accessing managed information.
-
- Textual conventions are defined in RFC 1903 [3], and conformance
- statements are defined in RFC 1904 [5].
-
- The Framework permits new objects to be defined for the purpose of
- experimentation and evaluation.
-
- This memo specifies a MIB module that is compliant to the SNMPv2 SMI.
- A semantically identical MIB conforming to the SNMPv1 SMI can be
- produced through the appropriate translation.
-
- 2.1. Object Definitions
-
- Managed objects are accessed via a virtual information store, termed
- the Management Information Base or MIB. Objects in the MIB are
- defined using the subset of Abstract Syntax Notation One (ASN.1)
- defined in the SMI. In particular, each object type is named by an
- OBJECT IDENTIFIER, an administratively assigned name. The object
- type together with an object instance serves to uniquely identify a
- specific instantiation of the object. For human convenience, we
- often use a textual string, termed the descriptor, to refer to the
- object type.
-
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- 3. Overview
-
- There is a need for a standardized way of representing a single agent
- which supports multiple instances of one MIB. This is presently true
- for at least 3 standard MIBs, and is likely to become true for more
- and more MIBs as time passes. For example:
-
- - multiple instances of a bridge supported within a single
- device having a single agent;
-
- - multiple repeaters supported by a single agent;
-
- - multiple OSPF backbone areas, each one 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 fact that it is a single agent in each of these cases implies
- there is some relationship which binds all of these entities
- together. Effectively, there is some "overall" physical entity which
- 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 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 what logical entities
- are managed by the agent (either by SNMPv1 or SNMPv2), and thereby to
- be able 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.
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- RFC 2037 Entity MIB using SMIv2 October 1996
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- 3.1. Terms
-
- Some new 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.
-
- - 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. It is an implementation-specific manner as to which physical
- components are represented by an agent in the EntPhysicalTable.
- Typically, physical resources (e.g. communications ports,
- backplanes, sensors, daughter-cards, power supplies, the overall
- chassis) which can be managed via functions associated with one or
- more logical entities are included in the MIB.
-
- - Containment Tree
- Each physical component may optionally be modeled as 'contained'
- within another physical component. A "containment-tree" is the
- conceptual sequence of entPhysicalIndex values which 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.
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- Note that chassis slots, which are capable of accepting one or more
- module types from one or more vendors, are modeled as containers in
- this MIB. The value of entPhysicalContainedIn for a particular
- 'module' entity (entPhysicalClass value of 'module(9)') must be
- equal to an entPhysicalIndex that represents the parent 'container'
- entity (associated entPhysicalClass value of ('container(5)'). An
- agent must represent both empty and full containers in the
- entPhysicalTable.
-
- 3.2. Relationship to Community Strings
-
- For community-based SNMP, distinguishing between different logical
- entities is one (but not the only) purpose of the community string
- [6]. 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.
-
- 3.3. 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. An 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.
-
- Note that a network administrator will likely be able to associate
- community strings with naming scopes with proprietary mechanisms, as
- a matter of configuration. There are no mechanisms for managing
- naming scopes defined in this MIB.
-
- 3.4. 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 this MIB to be a "Chassis MIB replacement", nor is it
- within the scope of this MIB to contain all the information which
- might be necessary to manage a "chassis". On the other hand, the
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- entities represented by an implementation of this MIB might well be
- contained in a chassis.
-
- 3.5. 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 [7]. Since
- 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 an 'entPhysicalName' object, which
- approximates the semantics of the ifName object from the Interfaces
- MIB [7] for all types of physical components.
-
- 3.6. Relationship to the Other MIBs
-
- The Entity MIB contains a mapping table identifying physical
- components that have identifiers from other standard MIBs 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.
-
- 3.7. Relationship to Naming Scopes
-
- There is some question as to which MIB objects may be returned within
- a given naming scope. MIB objects which are not multi-scoped within a
- managed system are likely to ignore context information in
- implementation. In such a case, it is likely such objects will be
- returned in all naming scopes (e.g. not just the 'main' naming
- scope).
-
- 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 'main' naming scope, as well as a
- second instance of the Bridge MIB.
-
- It is an implementation-specific matter as to the isolation of
- single-scoped MIB objects by the agent. An agent may wish to limit
- the objects returned in a particular naming scope to just 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. 'main'), which itself may
- contain some multi-scoped objects (e.g. system group).
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- 3.8. Multiple Instances of the Entity MIB
-
- It is possible that more than one agent exists in a managed system,
- and 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 an 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.
-
- 3.9. Re-Configuration of Entities
-
- All the MIB objects defined in this MIB have at most a read-only
- MAX-ACCESS clause, i.e., none are write-able. This is a conscious
- decision by the working group to limit this MIB's scope. It is
- possible that this restriction could be lifted after implementation
- experience, by means of additional tables (using the AUGMENTS clause)
- for configuration and extended entity information.
-
- 3.10. MIB Structure
-
- The Entity MIB contains five conformance groups:
-
- - entityPhysical group
- Describes the physical entities managed by a single agent.
-
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- - 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.
-
- 3.10.1. 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 contains at least one row for an "overall" physical entity.
- 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.
-
- 3.10.2. 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 SNMPv1 or SNMPv2C [9] access to the MIB
- information for the logical entity.
-
- 3.10.3. entityMapping Group
-
- This group contains a three tables to identify associations between
- different system components.
-
- The entLPMappingTable 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.
-
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- The entAliasMappingTable contains mappings between entLogicalIndex,
- entPhysicalIndex pairs and 'alias' object identifier values. This
- allows resources managed with other MIBs (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.
-
-
- The entPhysicalContainsTable 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.
-
- 3.10.4. 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 system configuration last changed.
-
- 3.10.5. entityNotifications Group
-
- This group contains notification definitions relating to the overall
- status of the Entity MIB instantiation.
-
- 3.11. Multiple Agents
-
- Even though a primary motivation for this MIB is to represent the
- multiple logical entities supported by a single agent, it is also
- possible to use it 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 which should be expected for agent implementations.
- Therefore, multiple agents within the same managed system are free to
- implement the Entity MIB independently. (Refer the section on
- "Multiple Instances of the Entity MIB" for more details).
-
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- 4. Definitions
-
- ENTITY-MIB DEFINITIONS ::= BEGIN
-
- IMPORTS
- MODULE-IDENTITY, OBJECT-TYPE,
- mib-2, NOTIFICATION-TYPE
- FROM SNMPv2-SMI
- TDomain, TAddress, DisplayString, TEXTUAL-CONVENTION,
- AutonomousType, RowPointer, TimeStamp
- FROM SNMPv2-TC
- MODULE-COMPLIANCE, OBJECT-GROUP
- FROM SNMPv2-CONF;
-
- entityMIB MODULE-IDENTITY
- LAST-UPDATED "9605160000Z"
- ORGANIZATION "IETF ENTMIB Working Group"
- CONTACT-INFO
- " WG E-mail: entmib@cisco.com
- Subscribe: majordomo@cisco.com
- msg body: subscribe entmib
-
- Keith McCloghrie
- ENTMIB Working Group Chair
- Cisco Systems Inc.
- 170 West Tasman Drive
- San Jose, CA 95134
- 408-526-5260
- kzm@cisco.com
-
- Andy Bierman
- ENTMIB Working Group Editor
- Cisco Systems Inc.
- 170 West Tasman Drive
- San Jose, CA 95134
- 408-527-3711
- abierman@cisco.com"
- DESCRIPTION
- "The MIB module for representing multiple logical
- entities supported by a single SNMP agent."
- ::= { mib-2 47 }
-
- entityMIBObjects OBJECT IDENTIFIER ::= { entityMIB 1 }
-
- -- MIB contains four groups
-
- entityPhysical OBJECT IDENTIFIER ::= { entityMIBObjects 1 }
- entityLogical OBJECT IDENTIFIER ::= { entityMIBObjects 2 }
-
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- entityMapping OBJECT IDENTIFIER ::= { entityMIBObjects 3 }
- entityGeneral OBJECT IDENTIFIER ::= { entityMIBObjects 4 }
-
-
- -- Textual Conventions
- PhysicalIndex ::= TEXTUAL-CONVENTION
- STATUS current
- DESCRIPTION
- "An arbitrary value which uniquely identifies the physical
- entity. The value is a small positive integer; index values
- for different physical entities are not necessarily
- contiguous."
- SYNTAX INTEGER (1..2147483647)
-
-
- PhysicalClass ::= TEXTUAL-CONVENTION
- STATUS current
- DESCRIPTION
- "An enumerated value which provides an indication of the
- general hardware type of a particular physical entity."
- SYNTAX INTEGER {
- other(1),
- unknown(2),
- chassis(3),
- backplane(4),
- container(5), -- e.g. slot or daughter-card holder
- powerSupply(6),
- fan(7),
- sensor(8),
- module(9), -- e.g. plug-in card or daughter-card
- port(10)
- }
-
- -- 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
-
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- 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 DisplayString,
- entPhysicalVendorType AutonomousType,
- entPhysicalContainedIn INTEGER,
- entPhysicalClass PhysicalClass,
- entPhysicalParentRelPos INTEGER,
- entPhysicalName DisplayString
- }
-
- entPhysicalIndex OBJECT-TYPE
- SYNTAX PhysicalIndex
- MAX-ACCESS not-accessible
- STATUS current
- DESCRIPTION
- "The index for this entry."
- ::= { entPhysicalEntry 1 }
-
- entPhysicalDescr OBJECT-TYPE
- SYNTAX DisplayString
- MAX-ACCESS read-only
- STATUS current
- DESCRIPTION
- "A textual description of physical entity. This object
- should contain a string which 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
-
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- physical entity. Note that this is different from the
- definition of MIB-II's sysObjectID.
-
- An agent should set this object to a 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 }
-
- entPhysicalContainedIn OBJECT-TYPE
- SYNTAX INTEGER (0..2147483647)
- MAX-ACCESS read-only
- STATUS current
- DESCRIPTION
- "The value of entPhysicalIndex for the physical entity which
- '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."
- ::= { entPhysicalEntry 4 }
-
- entPhysicalClass OBJECT-TYPE
- SYNTAX PhysicalClass
- 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 which most accurately indicates the general class of
- the physical entity, or the primary class if there is more
- than one.
-
- 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 INTEGER (-1..2147483647)
-
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- 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 which share the
- same instance values of each of the entPhysicalContainedIn
- and entPhysicalClass objects.
-
- 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).
-
- This value should match any external labeling of the
- physical component if possible. For example, for a module
- labeled as 'card #3', entPhysicalParentRelPos should have
- the value '3'.
-
- 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 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 a
- 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.
-
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- 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
- SYNTAX DisplayString
- 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, such as `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 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 }
-
- -- 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. At least
- one entry must exist."
- ::= { 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 }
-
-
-
- McCloghrie & Bierman Standards Track [Page 15]
-
- RFC 2037 Entity MIB using SMIv2 October 1996
-
-
- EntLogicalEntry ::= SEQUENCE {
- entLogicalIndex INTEGER,
- entLogicalDescr DisplayString,
- entLogicalType AutonomousType,
- entLogicalCommunity OCTET STRING,
- entLogicalTAddress TAddress,
- entLogicalTDomain TDomain
- }
-
- entLogicalIndex OBJECT-TYPE
- SYNTAX INTEGER (1..2147483647)
- MAX-ACCESS not-accessible
- STATUS current
- DESCRIPTION
- "The value of this object uniquely identifies the logical
- entity. The value is a small positive integer; index values
- for different logical entities are are not necessarily
- contiguous."
- ::= { entLogicalEntry 1 }
-
- entLogicalDescr OBJECT-TYPE
- SYNTAX DisplayString
- MAX-ACCESS read-only
- STATUS current
- DESCRIPTION
- "A textual description of the logical entity. This object
- should contain a string which 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 which 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 }
-
-
-
-
- McCloghrie & Bierman Standards Track [Page 16]
-
- RFC 2037 Entity MIB using SMIv2 October 1996
-
-
- entLogicalCommunity OBJECT-TYPE
- SYNTAX OCTET STRING (SIZE (1..255))
- MAX-ACCESS read-only
- STATUS current
- 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 choose to return a community string
- based on the privileges of the request used to read this
- object. Note that an agent may choose to return a community
- string with read-only privileges, even if this object is
- accessed with a read-write community string. However, the
- agent must take care not to return a community string which
- allows more privileges than the community string used to
- access this object.
-
- A compliant SNMP agent may wish to conserve naming scopes by
- representing multiple logical entities in a single 'main'
- 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 'main'
- naming scope.
-
- For agents not accessible via SNMPv1 or SNMPv2C, the value
- of this object is the empty-string."
- ::= { entLogicalEntry 4 }
-
- entLogicalTAddress OBJECT-TYPE
- SYNTAX TAddress
- MAX-ACCESS read-only
- STATUS current
- DESCRIPTION
- "The transport service address by which the logical entity
- receives network management traffic, formatted according to
- the corresponding value of entLogicalTDomain.
-
- For snmpUDPDomain, a TAddress is 6 octets long, the initial
- 4 octets containing the IP-address in network-byte order and
- the last 2 containing the UDP port in network-byte order.
- Consult 'Transport Mappings for Version 2 of the Simple
-
-
-
- McCloghrie & Bierman Standards Track [Page 17]
-
- RFC 2037 Entity MIB using SMIv2 October 1996
-
-
- Network Management Protocol' (RFC 1906 [8]) for further
- information on snmpUDPDomain."
- ::= { entLogicalEntry 5 }
-
- entLogicalTDomain OBJECT-TYPE
- SYNTAX TDomain
- MAX-ACCESS read-only
- STATUS current
- DESCRIPTION
- "Indicates the kind of transport service by which the
- logical entity receives network management traffic.
- Possible values for this object are presently found in the
- Transport Mappings for SNMPv2 document (RFC 1906 [8])."
- ::= { entLogicalEntry 6 }
-
- entLPMappingTable OBJECT-TYPE
- SYNTAX SEQUENCE OF EntLPMappingEntry
- MAX-ACCESS not-accessible
- STATUS current
- DESCRIPTION
- "This table contains zero or more rows of logical entity to
- physical equipment associations. For each logical entity
- known by this agent, there are zero or more mappings to the
- physical resources which are used to realize that logical
- entity.
-
- An agent should limit the number and nature of entries in
- this table such that only meaningful and non-redundant
- information is returned. For example, in a system which
- contains a single power supply, mappings between logical
- entities and the power supply are not useful and should not
- be included.
-
- Also, only the most appropriate physical component which is
- closest to the root of a particular containment tree should
- be identified in an entLPMapping entry.
-
- For example, suppose a bridge is realized on a particular
- module, and all ports on that module are ports on this
- bridge. A mapping between the bridge and the module would be
- useful, but additional mappings between the bridge and each
- of the ports on that module would be redundant (since the
- entPhysicalContainedIn hierarchy can provide the same
- information). If, on the other hand, more than one bridge
- was utilizing ports on this module, then mappings between
- each bridge and the ports it used would be appropriate.
-
- Also, in the case of a single backplane repeater, a mapping
-
-
-
- McCloghrie & Bierman Standards Track [Page 18]
-
- RFC 2037 Entity MIB using SMIv2 October 1996
-
-
- for the backplane to the single repeater entity is not
- necessary."
- ::= { entityMapping 1 }
-
- entLPMappingEntry OBJECT-TYPE
- SYNTAX EntLPMappingEntry
- MAX-ACCESS not-accessible
- STATUS current
- DESCRIPTION
- "Information about a particular logical entity to physical
- equipment association. Note that the nature of the
- association is not specifically identified in this entry. It
- is expected that sufficient information exists in the MIBs
- used to manage a particular logical entity to infer how
- physical component information is utilized."
- INDEX { entLogicalIndex, entLPPhysicalIndex }
- ::= { entLPMappingTable 1 }
-
- EntLPMappingEntry ::= SEQUENCE {
- entLPPhysicalIndex PhysicalIndex
- }
-
- entLPPhysicalIndex OBJECT-TYPE
- SYNTAX PhysicalIndex
- MAX-ACCESS read-only
- STATUS current
- DESCRIPTION
- "The value of this object identifies the index value of a
- particular entPhysicalEntry associated with the indicated
- entLogicalEntity."
- ::= { entLPMappingEntry 1 }
-
- -- logical entity/component to alias table
- entAliasMappingTable OBJECT-TYPE
- SYNTAX SEQUENCE OF EntAliasMappingEntry
- MAX-ACCESS not-accessible
- STATUS current
- DESCRIPTION
- "This table contains zero or more rows, representing
- mappings of logical entity and physical component to
- external MIB identifiers. Each physical port in the system
- may be associated with a mapping to an external identifier,
- which itself is associated with a particular logical
- entity's naming scope. A 'wildcard' mechanism is provided to
- indicate that an identifier is associated with more than one
- logical entity."
- ::= { entityMapping 2 }
-
-
-
-
- McCloghrie & Bierman Standards Track [Page 19]
-
- RFC 2037 Entity MIB using SMIv2 October 1996
-
-
- entAliasMappingEntry OBJECT-TYPE
- SYNTAX EntAliasMappingEntry
- MAX-ACCESS not-accessible
- STATUS current
- DESCRIPTION
- "Information about a particular physical equipment, logical
- entity to external identifier binding. Each logical
- entity/physical component pair may be associated with one
- alias mapping. The logical entity index may also be used as
- a 'wildcard' (refer to the entAliasLogicalIndexOrZero object
- DESCRIPTION clause for details.)
-
- Note that only entPhysicalIndex values which represent
- physical ports (i.e. associated entPhysicalClass value is
- 'port(10)') are permitted to exist in this table."
- INDEX { entPhysicalIndex, entAliasLogicalIndexOrZero }
- ::= { entAliasMappingTable 1 }
-
- EntAliasMappingEntry ::= SEQUENCE {
- entAliasLogicalIndexOrZero INTEGER,
- entAliasMappingIdentifier RowPointer
- }
-
- entAliasLogicalIndexOrZero OBJECT-TYPE
- SYNTAX INTEGER (0..2147483647)
- MAX-ACCESS not-accessible
- STATUS current
- DESCRIPTION
- "The value of this object uniquely identifies the logical
- entity which defines the naming scope for the associated
- instance of the 'entAliasMappingIdentifier' object.
-
- If this object has a non-zero value, then it identifies the
- logical entity named by the same value of entLogicalIndex.
-
- If this object has a value of zero, then the mapping between
- the physical component and the alias identifier for this
- entAliasMapping entry is associated with all unspecified
- logical entities. That is, a value of zero (the default
- mapping) identifies any logical entity which does not have
- an explicit entry in this table for a particular
- entPhysicalIndex/entAliasMappingIdentifier pair.
-
- For example, to indicate that a particular interface (e.g.
- physical component 33) is identified by the same value of
- ifIndex for all logical entities, the following instance
- might exist:
-
-
-
-
- McCloghrie & Bierman Standards Track [Page 20]
-
- RFC 2037 Entity MIB using SMIv2 October 1996
-
-
- entAliasMappingIdentifier.33.0 = ifIndex.5
-
- In the event an entPhysicalEntry is associated differently
- for some logical entities, additional entAliasMapping
- entries may exist, e.g.:
-
- entAliasMappingIdentifier.33.0 = ifIndex.6
- entAliasMappingIdentifier.33.4 = ifIndex.1
- entAliasMappingIdentifier.33.5 = ifIndex.1
- entAliasMappingIdentifier.33.10 = ifIndex.12
-
- Note that entries with non-zero entAliasLogicalIndexOrZero
- index values have precedence over any zero-indexed entry. In
- this example, all logical entities except 4, 5, and 10,
- associate physical entity 33 with ifIndex.6."
- ::= { entAliasMappingEntry 1 }
-
-
- entAliasMappingIdentifier OBJECT-TYPE
- SYNTAX RowPointer
- MAX-ACCESS read-only
- STATUS current
- DESCRIPTION
- "The value of this object identifies a particular conceptual
- row associated with the indicated entPhysicalIndex and
- entLogicalIndex pair.
-
- Since only physical ports are modeled in this table, only
- entries which represent interfaces or ports are allowed. If
- an ifEntry exists on behalf of a particular physical port,
- then this object should identify the associated 'ifEntry'.
- For repeater ports, the appropriate row in the
- 'rptrPortGroupTable' should be identified instead.
-
- For example, suppose a physical port was represented by
- entPhysicalEntry.3, entLogicalEntry.15 existed for a
- repeater, and entLogicalEntry.22 existed for a bridge. Then
- there might be two related instances of
- entAliasMappingIdentifier:
- entAliasMappingIdentifier.3.15 == rptrPortGroupIndex.5.2
- entAliasMappingIdentifier.3.22 == ifIndex.17
- It is possible that other mappings (besides interfaces and
- repeater ports) may be defined in the future, as required.
-
- Bridge ports are identified by examining the Bridge MIB and
- appropriate ifEntries associated with each 'dot1dBasePort',
- and are thus not represented in this table."
- ::= { entAliasMappingEntry 2 }
-
-
-
- McCloghrie & Bierman Standards Track [Page 21]
-
- RFC 2037 Entity MIB using SMIv2 October 1996
-
-
- -- physical mapping table
- entPhysicalContainsTable OBJECT-TYPE
- SYNTAX SEQUENCE OF EntPhysicalContainsEntry
- MAX-ACCESS not-accessible
- STATUS current
- DESCRIPTION
- "A table which exposes the container/containee relationships
- between physical entities. This table provides equivalent
- information found by constructing the virtual containment
- tree for a given entPhysicalTable but in a more direct
- format."
- ::= { entityMapping 3 }
-
- entPhysicalContainsEntry OBJECT-TYPE
- SYNTAX EntPhysicalContainsEntry
- MAX-ACCESS not-accessible
- STATUS current
- DESCRIPTION
- "A single container/containee relationship."
- INDEX { entPhysicalIndex, entPhysicalChildIndex }
- ::= { entPhysicalContainsTable 1 }
-
- EntPhysicalContainsEntry ::= SEQUENCE {
- entPhysicalChildIndex PhysicalIndex
- }
-
- entPhysicalChildIndex OBJECT-TYPE
- SYNTAX PhysicalIndex
- MAX-ACCESS read-only
- STATUS current
- DESCRIPTION
- "The value of entPhysicalIndex for the contained physical
- entity."
- ::= { entPhysicalContainsEntry 1 }
-
- -- last change time stamp for the whole MIB
- entLastChangeTime OBJECT-TYPE
- SYNTAX TimeStamp
- MAX-ACCESS read-only
- STATUS current
- DESCRIPTION
- "The value of sysUpTime at the time any of these events
- occur:
- * a conceptual row is created or deleted in any
- of these tables:
- - entPhysicalTable
- - entLogicalTable
- - entLPMappingTable
-
-
-
- McCloghrie & Bierman Standards Track [Page 22]
-
- RFC 2037 Entity MIB using SMIv2 October 1996
-
-
- - entAliasMappingTable
- - entPhysicalContainsTable
-
- * any instance in the following list of objects
- changes value:
- - entPhysicalDescr
- - entPhysicalVendorType
- - entPhysicalContainedIn
- - entPhysicalClass
- - entPhysicalParentRelPos
- - entPhysicalName
- - entLogicalDescr
- - entLogicalType
- - entLogicalCommunity
- - entLogicalTAddress
- - entLogicalTDomain
- - entAliasMappingIdentifier "
- ::= { entityGeneral 1 }
-
- -- Entity MIB Trap Definitions
- entityMIBTraps OBJECT IDENTIFIER ::= { entityMIB 2 }
- entityMIBTrapPrefix OBJECT IDENTIFIER ::= { entityMIBTraps 0 }
-
- entConfigChange NOTIFICATION-TYPE
- STATUS current
- DESCRIPTION
- "An entConfigChange trap is sent when the value of
- entLastChangeTime changes. It can be utilized by an NMS to
- trigger logical/physical entity table maintenance polls.
-
- An agent must not generate more than one entConfigChange
- 'trap-event' in a five second period, where a 'trap-event'
- is the transmission of a single trap PDU to a list of trap
- destinations. If additional configuration changes occur
- within the five second 'throttling' period, then these
- trap-events should be suppressed by the agent. An NMS should
- periodically check the value of entLastChangeTime to detect
- any missed entConfigChange trap-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
-
-
-
- McCloghrie & Bierman Standards Track [Page 23]
-
- RFC 2037 Entity MIB using SMIv2 October 1996
-
-
- entityCompliance MODULE-COMPLIANCE
- STATUS current
- DESCRIPTION
- "The compliance statement for SNMP entities which implement
- the Entity MIB."
- MODULE -- this module
- MANDATORY-GROUPS { entityPhysicalGroup,
- entityLogicalGroup,
- entityMappingGroup,
- entityGeneralGroup,
- entityNotificationsGroup }
- ::= { entityCompliances 1 }
-
- -- MIB groupings
-
- entityPhysicalGroup OBJECT-GROUP
- OBJECTS {
- entPhysicalDescr,
- entPhysicalVendorType,
- entPhysicalContainedIn,
- entPhysicalClass,
- entPhysicalParentRelPos,
- entPhysicalName
- }
- STATUS current
- DESCRIPTION
- "The collection of objects which are used to represent
- physical system components, for which a single agent
- provides management information."
- ::= { entityGroups 1 }
-
- entityLogicalGroup OBJECT-GROUP
- OBJECTS {
- entLogicalDescr,
- entLogicalType,
- entLogicalCommunity,
- entLogicalTAddress,
- entLogicalTDomain
- }
- STATUS current
- DESCRIPTION
- "The collection of objects which are used to represent the
- list of logical entities for which a single agent provides
- management information."
- ::= { entityGroups 2 }
-
- entityMappingGroup OBJECT-GROUP
- OBJECTS {
-
-
-
- McCloghrie & Bierman Standards Track [Page 24]
-
- RFC 2037 Entity MIB using SMIv2 October 1996
-
-
- entLPPhysicalIndex,
- entAliasMappingIdentifier,
- entPhysicalChildIndex
- }
- STATUS current
- DESCRIPTION
- "The collection of objects which are used to represent the
- associations between multiple logical entities, physical
- components, interfaces, and port identifiers for which a
- single agent provides management information."
- ::= { entityGroups 3 }
-
- entityGeneralGroup OBJECT-GROUP
- OBJECTS {
- entLastChangeTime
- }
- STATUS current
- DESCRIPTION
- "The collection of objects which are used to represent
- general entity information for which a single agent provides
- management information."
- ::= { entityGroups 4 }
-
- entityNotificationsGroup NOTIFICATION-GROUP
- NOTIFICATIONS { entConfigChange }
- STATUS current
- DESCRIPTION
- "The collection of notifications used to indicate Entity MIB
- data consistency and general status information."
- ::= { entityGroups 5 }
-
-
- END
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
- McCloghrie & Bierman Standards Track [Page 25]
-
- RFC 2037 Entity MIB using SMIv2 October 1996
-
-
- 5. 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.
-
- 5.1. Router/Bridge
-
- A router containing two slots. Each slot contains a 3 port
- router/bridge module. Each port is represented in the ifTable. There
- are two logical instances of OSPF running and two logical bridges:
-
- Physical entities -- entPhysicalTable:
- 1 Field-replaceable physical chassis:
- entPhysicalDescr.1 == "Acme Chassis Model 100"
- entPhysicalVendorType.1 == acmeProducts.chassisTypes.1
- entPhysicalContainedIn.1 == 0
- entPhysicalClass.1 == chassis(3)
- entPhysicalParentRelPos.1 == 0
- entPhysicalName.1 == '100-A'
-
- 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'
-
- 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'
-
- 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'
-
- entPhysicalDescr.5 == "Acme Ethernet-100 Port Rev G"
-
-
-
- McCloghrie & Bierman Standards Track [Page 26]
-
- RFC 2037 Entity MIB using SMIv2 October 1996
-
-
- entPhysicalVendorType.5 == acmeProducts.portTypes.2
- entPhysicalContainedIn.5 == 4
- entPhysicalClass.5 == port(10)
- entPhysicalParentRelPos.5 == 1
- entPhysicalName.5 == 'P1'
-
- entPhysicalDescr.6 == "Acme Ethernet-100 Port Rev G"
- entPhysicalVendorType.6 == acmeProducts.portTypes.2
- entPhysicalContainedIn.6 == 4
- entPhysicalClass.6 == port(10)
- entPhysicalParentRelPos.6 == 2
- entPhysicalName.6 == 'P2'
-
- entPhysicalDescr.7 == "Acme Router-100 F-Port: Rev B"
- entPhysicalVendorType.7 == acmeProducts.portTypes.3
- entPhysicalContainedIn.7 == 4
- entPhysicalClass.7 == port(10)
- entPhysicalParentRelPos.7 == 3
- entPhysicalName.7 == 'P3'
-
- Slot 2 contains another 3-port module:
- entPhysicalDescr.8 == "Acme Router-100 Comm Module: Rev C"
- entPhysicalVendorType.8 == acmeProducts.moduleTypes.15
- entPhysicalContainedIn.8 == 3
- entPhysicalClass.8 == module(9)
- entPhysicalParentRelPos.8 == 1
- entPhysicalName.8 == 'M2'
-
- entPhysicalDescr.9 == "Acme Fddi-100 Port Rev CC"
- entPhysicalVendorType.9 == acmeProducts.portTypes.5
- entPhysicalContainedIn.9 == 8
- entPhysicalClass.9 == port(10)
- entPhysicalParentRelPos.9 == 1
- entPhysicalName.9 == 'FDDI Primary'
-
- entPhysicalDescr.10 == "Acme Ethernet-100 Port Rev G"
- entPhysicalVendorType.10 == acmeProducts.portTypes.2
- entPhysicalContainedIn.10 == 8
- entPhysicalClass.10 == port(10)
- entPhysicalParentRelPos.10 == 2
- entPhysicalName.10 == 'Ethernet A'
-
- entPhysicalDescr.11 == "Acme Ethernet-100 Port Rev G"
- entPhysicalVendorType.11 == acmeProducts.portTypes.2
- entPhysicalContainedIn.11 == 8
- entPhysicalClass.11 == port(10)
- entPhysicalParentRelPos.11 == 3
- entPhysicalName.11 == 'Ethernet B'
-
-
-
- McCloghrie & Bierman Standards Track [Page 27]
-
- RFC 2037 Entity MIB using SMIv2 October 1996
-
-
- Logical entities -- entLogicalTable
- 2 OSPF instances:
- entLogicalDescr.1 == "Acme OSPF v1.1"
- entLogicalType.1 == ospf
- entLogicalCommunity.1 == "public-ospf1"
- entLogicalTAddress.1 == 124.125.126.127:161
- entLogicalTDomain.1 == snmpUDPDomain
-
- entLogicalDescr.2 == "Acme OSPF v1.1"
- entLogicalType.2 == ospf
- entLogicalCommunity.2 == "public-ospf2"
- entLogicalTAddress.2 == 124.125.126.127:161
- entLogicalTDomain.2 == snmpUDPDomain
-
- 2 logical bridges:
- entLogicalDescr.3 == "Acme Bridge v2.1.1"
- entLogicalType.3 == dod1dBridge
- entLogicalCommunity.3 == "public-bridge1"
- entLogicalTAddress.3 == 124.125.126.127:161
- entLogicalTDomain.3 == snmpUDPDomain
-
- entLogicalDescr.4 == "Acme Bridge v2.1.1"
- entLogicalType.4 == dod1dBridge
- entLogicalCommunity.4 == "public-bridge2"
- entLogicalTAddress.4 == 124.125.126.127:161
- entLogicalTDomain.4 == snmpUDPDomain
-
- Logical to Physical Mappings:
- 1st OSPF instance: uses module 1-port 1
- entLPPhysicalIndex.1.5 == 5
-
- 2nd OSPF instance: uses module 2-port 1
- entLPPhysicalIndex.2.9 == 9
-
- 1st bridge group: uses module 1, all ports
-
- [ed. -- Note that these mappings are included in the table since
- another logical entity (1st OSPF) utilizes one of the
- ports. If this were not the case, then a single mapping
- to the module (e.g. entLPPhysicalIndex.3.4) would be
- present instead. ]
- entLPPhysicalIndex.3.5 == 5
- entLPPhysicalIndex.3.6 == 6
- entLPPhysicalIndex.3.7 == 7
-
- 2nd bridge group: uses module 2, all ports
- entLPPhysicalIndex.4.9 == 9
- entLPPhysicalIndex.4.10 == 10
-
-
-
- McCloghrie & Bierman Standards Track [Page 28]
-
- RFC 2037 Entity MIB using SMIv2 October 1996
-
-
- entLPPhysicalIndex.4.11 == 11
-
- Physical to Logical to MIB Alias Mappings -- entAliasMappingTable:
- Example 1: ifIndex values are global to all logical entities
- entAliasMappingIdentifier.5.0 == ifIndex.1
- entAliasMappingIdentifier.6.0 == ifIndex.2
- entAliasMappingIdentifier.7.0 == ifIndex.3
- entAliasMappingIdentifier.9.0 == ifIndex.4
- entAliasMappingIdentifier.10.0 == ifIndex.5
- entAliasMappingIdentifier.11.0 == ifIndex.6
-
- Example 2: ifIndex values are not shared by all logical entities
- entAliasMappingIdentifier.5.0 == ifIndex.1
- entAliasMappingIdentifier.5.3 == ifIndex.101
- entAliasMappingIdentifier.6.0 == ifIndex.2
- entAliasMappingIdentifier.6.3 == ifIndex.102
- entAliasMappingIdentifier.7.0 == ifIndex.3
- entAliasMappingIdentifier.7.3 == ifIndex.103
- entAliasMappingIdentifier.9.0 == ifIndex.4
- entAliasMappingIdentifier.9.3 == ifIndex.204
- entAliasMappingIdentifier.10.0 == ifIndex.5
- entAliasMappingIdentifier.10.3 == ifIndex.205
- entAliasMappingIdentifier.11.0 == ifIndex.6
- entAliasMappingIdentifier.11.3 == ifIndex.206
-
- Physical Containment Tree -- entPhysicalContainsTable
- chassis has two containers:
- entPhysicalChildIndex.1.2 = 2
- entPhysicalChildIndex.1.3 = 3
-
- container 1 has a module:
- entPhysicalChildIndex.2.4 = 4
-
- container 2 has a module:
- entPhysicalChildIndex.3.8 = 8
-
- module 1 has 3 ports:
- entPhysicalChildIndex.4.5 = 5
- entPhysicalChildIndex.4.6 = 6
- entPhysicalChildIndex.4.7 = 7
-
- module 2 has 3 ports:
- entPhysicalChildIndex.8.9 = 9
- entPhysicalChildIndex.8.10 = 10
- entPhysicalChildIndex.1.11 = 11
-
-
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- McCloghrie & Bierman Standards Track [Page 29]
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-
-
- 5.2. Repeaters
-
- A 3-slot Hub with 2 backplane ethernet segments. Slot three is
- empty, and the remaining slots contain ethernet repeater modules.
- [ed. -- Note that a replacement for the current Repeater MIB (RFC
- 1516) is likely to emerge soon, and it will no longer be necessary to
- access repeater MIB data in different naming scopes.]
-
- 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'
-
- 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'
-
- 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'
-
- 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'
-
- 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'
-
- entPhysicalDescr.6 == "Acme Hub Slot Type RB"
-
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- entPhysicalVendorType.6 == acmeProducts.slotTypes.5
- entPhysicalContainedIn.6 == 1
- entPhysicalClass.6 == container(5)
- entPhysicalParentRelPos.6 == 3
- entPhysicalName.6 == 'Slot 3'
-
- Slot 1 contains a plug-in module with 4 10-BaseT ports:
- entPhysicalDescr.7 == "Acme 10Base-T Module 114 Rev A"
- entPhysicalVendorType.7 == acmeProducts.moduleTypes.32
- entPhysicalContainedIn.7 == 4
- entPhysicalClass.7 == module(9)
- entPhysicalParentRelPos.7 == 1
- entPhysicalName.7 == 'M1'
-
- entPhysicalDescr.8 == "Acme 10Base-T Port RB Rev A"
- entPhysicalVendorType.8 == acmeProducts.portTypes.10
- entPhysicalContainedIn.8 == 7
- entPhysicalClass.8 == port(10)
- entPhysicalParentRelPos.8 == 1
- entPhysicalName.8 == 'Ethernet-A'
-
- entPhysicalDescr.9 == "Acme 10Base-T Port RB Rev A"
- entPhysicalVendorType.9 == acmeProducts.portTypes.10
- entPhysicalContainedIn.9 == 7
- entPhysicalClass.9 == port(10)
- entPhysicalParentRelPos.9 == 2
- entPhysicalName.9 == 'Ethernet-B'
-
- entPhysicalDescr.10 == "Acme 10Base-T Port RB Rev B"
- entPhysicalVendorType.10 == acmeProducts.portTypes.10
- entPhysicalContainedIn.10 == 7
- entPhysicalClass.10 == port(10)
- entPhysicalParentRelPos.10 == 3
- entPhysicalName.10 == 'Ethernet-C'
-
- entPhysicalDescr.11 == "Acme 10Base-T Port RB Rev B"
- entPhysicalVendorType.11 == acmeProducts.portTypes.10
- entPhysicalContainedIn.11 == 7
- entPhysicalClass.11 == port(10)
- entPhysicalParentRelPos.11 == 4
- entPhysicalName.11 == 'Ethernet-D'
-
- Slot 2 contains another ethernet module with 2 ports.
- entPhysicalDescr.12 == "Acme 10Base-T Module Model 4 Rev A"
- entPhysicalVendorType.12 == acmeProducts.moduleTypes.30
- entPhysicalContainedIn.12 = 5
- entPhysicalClass.12 == module(9)
- entPhysicalParentRelPos.12 == 1
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- entPhysicalName.12 == 'M2'
-
- entPhysicalDescr.13 == "Acme 802.3 AUI Port Rev A"
- entPhysicalVendorType.13 == acmeProducts.portTypes.11
- entPhysicalContainedIn.13 == 12
- entPhysicalClass.13 == port(10)
- entPhysicalParentRelPos.13 == 1
- entPhysicalName.13 == 'AUI'
-
- entPhysicalDescr.14 == "Acme 10Base-T Port RD Rev B"
- entPhysicalVendorType.14 == acmeProducts.portTypes.14
- entPhysicalContainedIn.14 == 12
- entPhysicalClass.14 == port(10)
- entPhysicalParentRelPos.14 == 2
- entPhysicalName.14 == 'E2'
-
- Logical entities -- entLogicalTable
- Repeater 1--comprised of any ports attached to backplane 1
- entLogicalDescr.1 == "Acme repeater v3.1"
- entLogicalType.1 == snmpDot3RptrMgt
- entLogicalCommunity.1 "public-repeater1"
- entLogicalTAddress.1 == 124.125.126.127:161
- entLogicalTDomain.1 == snmpUDPDomain
-
- Repeater 2--comprised of any ports attached to backplane 2:
- entLogicalDescr.2 == "Acme repeater v3.1"
- entLogicalType.2 == snmpDot3RptrMgt
- entLogicalCommunity.2 == "public-repeater2"
- entLogicalTAddress.2 == 124.125.126.127:161
- entLogicalTDomain.2 == snmpUDPDomain
-
- Logical to Physical Mappings -- entLPMappingTable:
-
- repeater1 uses backplane 1, slot 1-ports 1 & 2, slot 2-port 1
- [ed. -- Note that a mapping to the module is not included,
- since in this example represents a port-switchable hub.
- Even though all ports on the module could belong to the
- same repeater as a matter of configuration, the LP port
- mappings should not be replaced dynamically with a single
- mapping for the module (e.g. entLPPhysicalIndex.1.7).
- If all ports on the module shared a single backplane connection,
- then a single mapping for the module would be more appropriate. ]
-
- entLPPhysicalIndex.1.2 == 2
- entLPPhysicalIndex.1.8 == 8
- entLPPhysicalIndex.1.9 == 9
- entLPPhysicalIndex.1.13 == 13
-
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-
- repeater2 uses backplane 2, slot 1-ports 3 & 4, slot 2-port 2
- entLPPhysicalIndex.2.3 == 3
- entLPPhysicalIndex.2.10 == 10
- entLPPhysicalIndex.2.11 == 11
- entLPPhysicalIndex.2.14 == 14
-
- Physical to Logical to MIB Alias Mappings -- entAliasMappingTable:
- Repeater Port Identifier values are shared by both repeaters:
- entAliasMappingIdentifier.8.0 == rptrPortGroupIndex.1.1
- entAliasMappingIdentifier.9.0 == rptrPortGroupIndex.1.2
- entAliasMappingIdentifier.10.0 == rptrPortGroupIndex.1.3
- entAliasMappingIdentifier.11.0 == rptrPortGroupIndex.1.4
- entAliasMappingIdentifier.13.0 == rptrPortGroupIndex.2.1
- entAliasMappingIdentifier.14.0 == rptrPortGroupIndex.2.2
-
- Physical Containment Tree -- entPhysicalContainsTable
- chassis has two backplanes and three containers:
- entPhysicalChildIndex.1.2 = 2
- entPhysicalChildIndex.1.3 = 3
- entPhysicalChildIndex.1.4 = 4
- entPhysicalChildIndex.1.5 = 5
- entPhysicalChildIndex.1.6 = 6
-
- container 1 has a module:
- entPhysicalChildIndex.4.7 = 7
-
- container 2 has a module
- entPhysicalChildIndex.5.12 = 12
- [ed. - in this example, container 3 is empty.]
-
- module 1 has 4 ports:
- entPhysicalChildIndex.7.8 = 8
- entPhysicalChildIndex.7.9 = 9
- entPhysicalChildIndex.7.10 = 10
- entPhysicalChildIndex.7.11 = 11
-
- module 2 has 2 ports:
- entPhysicalChildIndex.12.13 = 13
- entPhysicalChildIndex.12.14 = 14
-
- 6. Acknowledgements
-
- This document was produced by the IETF Entity MIB Working Group.
-
-
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- 7. References
-
- [1] SNMPv2 Working Group, Case, J., McCloghrie, K., Rose, M., and
- S. Waldbusser, "Structure of Management Information for version 2
- of the Simple Network Management Protocol (SNMPv2)", RFC 1902,
- January 1996.
-
- [2] McCloghrie, K., and M. Rose, Editors, "Management Information Base
- for Network Management of TCP/IP-based internets: MIB-II", STD 17,
- RFC 1213, Hughes LAN Systems, Performance Systems International,
- March 1991.
-
- [3] SNMPv2 Working Group, Case, J., McCloghrie, K., Rose, M., and
- S. Waldbusser, "Textual Conventions for version 2 of the Simple
- Network Management Protocol (SNMPv2)", RFC 1903, January 1996.
-
- [4] SNMPv2 Working Group, Case, J., McCloghrie, K., Rose, M., and
- S. Waldbusser, "Protocol Operations for version 2 of the Simple
- Network Management Protocol (SNMPv2)", RFC 1905, January 1996.
-
- [5] SNMPv2 Working Group, Case, J., McCloghrie, K., Rose, M., and
- S. Waldbusser, "Conformance Statements for version 2 of the Simple
- Network Management Protocol (SNMPv2)", RFC 1904, January 1996.
-
- [6] Case, J., M. Fedor, M. Schoffstall, J. Davin, "Simple Network
- Management Protocol", RFC 1157, SNMP Research, Performance Systems
- International, MIT Laboratory for Computer Science, May 1990.
-
- [7] McCloghrie, K., and Kastenholtz, F., "Interfaces Group Evolution",
- RFC 1573, Hughes LAN Systems, FTP Software, January 1994.
-
- [8] SNMPv2 Working Group, Case, J., McCloghrie, K., Rose, M., and
- S. Waldbusser, "Transport Mappings for version 2 of the Simple
- Network Management Protocol (SNMPv2)", RFC 1906, January 1996.
-
- [9] SNMPv2 Working Group, Case, J., McCloghrie, K., Rose, M., and
- S. Waldbusser, "Introduction to Community-based SNMPv2", RFC 1901,
- January 1996.
-
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- 8. Security Considerations
-
- In order to implement this MIB, an agent must make certain management
- information available about various logical and physical entities
- within a managed system, which may be considered sensitive in some
- network environments.
-
- Therefore, a network administrator may wish to employ instance-level
- access control, and configure the Entity MIB access (i.e., community
- strings in SNMPv1 and SNMPv2C), such that certain instances within
- this MIB (e.g., entLogicalCommunity, or entire entLogicalEntries,
- entPhysicalEntries, and associated mapping table entries), are
- excluded from particular MIB views.
-
- 9. Authors' Addresses
-
- Keith McCloghrie
- Cisco Systems, Inc.
- 170 West Tasman Drive
- San Jose, CA 95134
-
- Phone: 408-526-5260
- EMail: kzm@cisco.com
-
-
- Andy Bierman
- Cisco Systems, Inc.
- 170 West Tasman Drive
- San Jose, CA 95134
-
- Phone: 408-527-3711
- EMail: abierman@cisco.com
-
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