ftp.cc.uoc.gr
rfc4268
This is a purely informative rendering of an RFC that includes verified errata. This rendering may not be used as a reference.

The following 'Verified' errata have been incorporated in this document: EID 826, EID 2611
Network Working Group                                        S. Chisholm
Request for Comments: 4268                               Nortel Networks
Category: Standards Track                                     D. Perkins
                                                                SNMPinfo
                                                           November 2005


                            Entity State MIB

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.

Copyright Notice

   Copyright (C) The Internet Society (2005).

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 extensions to the Entity MIB to provide
   information about the state of physical entities.

   In addition, this memo defines a set of Textual Conventions to
   represent various states of an entity.  The intent is that these
   Textual Conventions will be imported and used in MIB modules that
   would otherwise define their own representations.

Table of Contents

   1. The Internet-Standard Management Framework ......................2
   2. Entity State ....................................................2
      2.1. Hierarchical State Management ..............................3
      2.2. Entity Redundancy ..........................................3
      2.3. Physical Entity Users ......................................3
      2.4. Physical Class Behavior ....................................4
   3. Relation to Other MIBs ..........................................4
      3.1. Relation to the Interfaces MIB .............................4
      3.2. Relation to Alarm MIB ......................................5
      3.3. Relation to Bridge MIB .....................................5
      3.4. Relation to the Host Resources MIB .........................5
   4. Textual Conventions .............................................6
   5. Definitions .................................................... 9

   6. Security Considerations ........................................16
   7. Acknowledgements ...............................................17
   8. References .....................................................17
      8.1. Normative References ......................................17
      8.2. Informative References ....................................18

1.  The Internet-Standard 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 [RFC3410].

   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 [RFC2578], STD 58, RFC 2579 [RFC2579] and STD 58, RFC 2580
   [RFC2580].

2.  Entity State

   The goal in adding state objects to the Entity MIB [RFC4133] is to
   define a useful subset of the possible state attributes that could be
   tracked for a given entity and that both fit into the state models
   such as those used in the Interfaces MIB [RFC2863] as well as
   leverage existing well-deployed models.  The entStateTable contains
   state objects that are a subset of the popular ISO/OSI states that
   are also defined in ITU's X.731 specification [X.731].  Objects are
   defined to capture administrative, operational, and usage states.  In
   addition, there are further state objects defined to provide more
   information for these three basic states.

   Administrative state indicates permission to use or prohibition
   against using the entity and is imposed through the management
   services.

   Operational state indicates whether or not the entity is physically
   installed and working.  Note that unlike the ifOperStatus [RFC2863],
   this operational state is independent of the administrative state.

   Usage state indicates whether or not the entity is in use at a
   specific instance, and if so, whether or not it currently has spare
   capacity to serve additional users.  In the context of this MIB, the
   usage state refers to the ability of an entity to service other
   entities within its containment hierarchy.

   Alarm state indicates whether or not there are any alarms active
   against the entity.  In addition to those alarm states defined in
   X.731 [X.731], warning and indeterminate status are also defined to
   provide a more complete mapping to the Alarm MIB [RFC3877].

   Standby state indicates whether the entity is currently running as
   hot standby or cold standby or is currently providing service.

   The terms "state" and "status" are used interchangeably in this memo.

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [RFC2119].

2.1.  Hierarchical State Management

   Physical entities exist within a containment hierarchy.  Physical
   containment is defined by the entPhysicalContainedIn object[RFC4133].
   This raises some interesting issues not addressed in existing work on
   state management.

   There are two types of state for an entity:

   1) The state of the entity independent of the states of its parents
   and children in its containment hierarchy.  This is often referred to
   as raw state.

   2) The state of the entity, as it may be influenced by the state of
   its parents and children.  This is often referred to as computed
   state.

   All state objects in this memo are raw state.

2.2.  Entity Redundancy

   While this memo is not attempting to address the entire problem space
   around redundancy, the entStateStandby object provides an important
   piece of state information for entities, which helps identify which
   pieces of redundant equipment are currently providing service, and
   which are waiting in either hot or cold standby mode.

2.3.  Physical Entity Users

   There are three ways to define the 'user' of a physical entity

   1. Direct containment in physical hierarchy

   2. Anywhere in physical hierarchy

   3. As defined by a means outside the scope of this MIB.  This could
   include logical interfaces that could run on a port, software that
   could run on a module, etc.

   Administrative, operational, alarm, and standby state use all three
   definitions of 'user'.  Usage state supports only the concept of
   direct containment to simplify implementations of this object.

2.4.  Physical Class Behavior

   This MIB makes no effort to standardize the behaviors and
   characteristics of the various physical classes [RFC4133], but rather
   how this information is reported.  In looking at real-world products,
   items within the same physical class vary substantially.  The MIB has
   therefore provided guidance on how to support objects where a
   particular instance of a physical class cannot support part or all of
   a particular state.

3.  Relation to Other MIBs

3.1.  Relation to the Interfaces MIB

   The Interfaces MIB [RFC2863] defines the ifAdminStatus object, which
   has states of up, down, and testing, and the ifOperStatus object,
   which has states of up, down, testing, unknown, dormant, notPresent,
   and lowerLayerDown.

   An ifAdminStatus of 'up' is equivalent to setting the entStateAdmin
   object to 'unlocked'.  An ifAdminStatus of 'down' is equivalent to
   setting the entStateAdmin object to either 'locked' or
   'shuttingDown', depending on a system's interpretation of 'down'.

   An ifOperStatus of 'up' is equivalent to an entStateOper value of
   'enabled'.  An ifOperStatus of 'down' due to operational failure is
   equivalent to an entStateOper value of 'disabled'.  An ifOperStatus
   of 'down' due to being administratively disabled is equivalent to an
   entStateAdmin value of 'locked' and an entStateOper value of either
   'enabled' or 'disabled' depending on whether there are any known
   issues that would prevent the entity from becoming operational when
   its entStateAdmin is set to 'unlocked'.  An ifOperStatus of 'unknown'
   is equivalent to an entStateOper value of 'unknown'.  The
   ifOperStatus values of 'testing' and 'dormant' are not explicitly
   supported by this MIB, but the state objects will be able to reflect
   other aspects of the entities' administrative and operational state.
   The ifOperStatus values of 'notPresent' and 'lowerLayerDown' are in
   some ways computed states and so are therefore not supported in this

   MIB.  They can, though, be computed by examining the states of
   entities within this object's containment hierarchy and other
   available related states.

3.2.  Relation to Alarm MIB

   The entStateAlarm object indicates whether or not there are any
   active alarms against this entity.  If there are active alarms, then
   the alarmActiveTable in the Alarm MIB [RFC3877] should be searched
   for rows whose alarmActiveResourceId matches this entPhysicalIndex.

   Alternatively, if the alarmActiveTable is queried first and an active
   alarm with a value of alarmActiveResourceId that matches this
   entPhysicalIndex is found, then entStateAlarm can be used to quickly
   determine if there are additional active alarms with a different
   severity against this physical entity.

3.3 Relation to Bridge MIB

   For entities of physical type of 'port' that support the
   dot1dStpPortEnable object in the Bridge MIB [RFC4188], a value of
   'enabled' is equivalent to setting the entStateAdmin object to
   'unlocked'.  Setting dot1dStpPortEnable to 'disabled' is equivalent
   to setting the entStateAdmin object to 'locked'.

3.4 Relation to the Host Resources MIB

   The hrDeviceStatus object in the Host Resources MIB [RFC2790]
   provides an operational state for devices.  For entities that
   logically correspond to the concept of a device, a value of 'unknown'
   for hrDeviceStatus corresponds to an entStateOper value of 'unknown'.
   A value of 'running' corresponds to an entStateOper value of
   'enabled'.  A value of 'warning' also corresponds to an entStateOper
   value of 'enabled', but with appropriate bits set in the
   entStateAlarm object to indicate the alarms corresponding to the
   unusual error condition detected.  A value of 'testing' or 'down' is
   equivalent to an entStateOper value of 'disabled'.

4.  Textual Conventions

   ENTITY-STATE-TC-MIB DEFINITIONS ::= BEGIN

   IMPORTS
      MODULE-IDENTITY, mib-2       FROM SNMPv2-SMI
      TEXTUAL-CONVENTION           FROM SNMPv2-TC;

    entityStateTc MODULE-IDENTITY
        LAST-UPDATED "200511220000Z"
        ORGANIZATION "IETF Entity MIB Working Group"
        CONTACT-INFO
                "General Discussion: entmib@ietf.org
                 To Subscribe:
                 http://www.ietf.org/mailman/listinfo/entmib

                 http://www.ietf.org/html.charters/entmib-charter.html

                 Sharon Chisholm
                 Nortel Networks
                 PO Box 3511 Station C
                 Ottawa, Ont.  K1Y 4H7
                 Canada
                 schishol@nortel.com

                 David T. Perkins
                 548 Qualbrook Ct
                 San Jose, CA 95110
                 USA
                 Phone: 408 394-8702
                 dperkins@snmpinfo.com"
         DESCRIPTION
                "This MIB defines state textual conventions.

                 Copyright (C) The Internet Society 2005.  This version
                 of this MIB module is part of RFC 4268;  see the RFC
                 itself for full legal notices."
         REVISION    "200511220000Z"
         DESCRIPTION
             "Initial version, published as RFC 4268."
        ::= { mib-2 130 }

     EntityAdminState  ::=  TEXTUAL-CONVENTION
       STATUS         current
       DESCRIPTION
            " Represents the various possible administrative states.

              A value of 'locked' means the resource is administratively
              prohibited from use.  A value of 'shuttingDown' means that
              usage is administratively limited to current instances of
              use.  A value of 'unlocked' means the resource is not
              administratively prohibited from use.  A value of
              'unknown' means that this resource is unable to
              report administrative state."
       SYNTAX         INTEGER
                 {
                 unknown (1),
                 locked (2),
                 shuttingDown (3),
                 unlocked (4)
                 }

     EntityOperState  ::=  TEXTUAL-CONVENTION
       STATUS         current
       DESCRIPTION
            " Represents the possible values of operational states.

              A value of 'disabled' means the resource is totally
              inoperable.  A value of 'enabled' means the resource
              is partially or fully operable.  A value of 'testing'
              means the resource is currently being tested
              and cannot therefore report whether it is operational
              or not.  A value of 'unknown' means that this
              resource is unable to report operational state."
       SYNTAX         INTEGER
                 {
                 unknown (1),
                 disabled (2),
                 enabled (3),
                 testing (4)
                 }

     EntityUsageState  ::=  TEXTUAL-CONVENTION
       STATUS         current
       DESCRIPTION
            " Represents the possible values of usage states.
              A value of 'idle' means the resource is servicing no
              users.  A value of 'active' means the resource is
              currently in use and it has sufficient spare capacity
              to provide for additional users.  A value of 'busy'
              means the resource is currently in use, but it
              currently has no spare capacity to provide for
              additional users.  A value of 'unknown' means
              that this resource is unable to report usage state."
       SYNTAX         INTEGER

                 {
                 unknown (1),
                 idle (2),
                 active (3),
                 busy (4)
                 }


    EntityAlarmStatus  ::=  TEXTUAL-CONVENTION
       STATUS         current
       DESCRIPTION
          " Represents the possible values of alarm status.
            An Alarm [RFC3877] is a persistent indication
            of an error or warning condition.

            When no bits of this attribute are set, then no active
            alarms are known against this entity and it is not under
            repair.

            When the 'value of underRepair' is set, the resource is
            currently being repaired, which, depending on the
            implementation, may make the other values in this bit
            string not meaningful.

            When the value of 'critical' is set, one or more critical
            alarms are active against the resource.  When the value
            of 'major' is set, one or more major alarms are active
            against the resource.  When the value of 'minor' is set,
            one or more minor alarms are active against the resource.
            When the value of 'warning' is set, one or more warning
            alarms are active against the resource.  When the value
            of 'indeterminate' is set, one or more alarms of whose
            perceived severity cannot be determined are active
            against this resource.

            A value of 'unknown' means that this resource is
            unable to report alarm state."
             SYNTAX         BITS
                {
                unknown (0),
                underRepair (1),
                critical(2),
                major(3),
                minor(4),
                -- The following are not defined in X.733
                warning (5),
                indeterminate (6)
                              }

     EntityStandbyStatus  ::=  TEXTUAL-CONVENTION
       STATUS         current
       DESCRIPTION
            " Represents the possible values of standby status.

              A value of 'hotStandby' means the resource is not
              providing service, but it will be immediately able to
              take over the role of the resource to be backed up,
              without the need for initialization activity, and will
              contain the same information as the resource to be
              backed up.  A value of 'coldStandy' means that the
              resource is to back up another resource, but will not
              be immediately able to take over the role of a resource
              to be backed up, and will require some initialization
              activity.  A value of 'providingService' means the
              resource is providing service.  A value of
              'unknown' means that this resource is unable to
              report standby state."
             SYNTAX         INTEGER
               {
               unknown (1),
               hotStandby (2),
               coldStandby (3),
               providingService (4)
               }

   END

5.  Definitions

EID 2611 (Verified) is as follows:

Section: 5

Original Text:

   entStateOperEnabled NOTIFICATION-TYPE
.
.
.
               ...to find out whether
               there were any known alarms against the entity at that
               time that may explain why the physical entity has become
               operationally disabled."
     ::= { entStateNotifications 1 }

   entStateOperDisabled NOTIFICATION-TYPE
.
.
.
               ...to find out whether
               there were any known alarms against the entity at that
               time that may affect the physical entity's
               ability to stay operationally enabled."
     ::= { entStateNotifications 2 }


Corrected Text:

   entStateOperEnabled NOTIFICATION-TYPE
.
.
.
               ...to find out whether
               there were any known alarms against the entity at that
               time that may affect the physical entity's
               ability to stay operationally enabled."
     ::= { entStateNotifications 1 }

   entStateOperDisabled NOTIFICATION-TYPE
.
.
.
               ...to find out whether
               there were any known alarms against the entity at that
               time that may explain why the physical entity has become
               operationally disabled."
     ::= { entStateNotifications 2 }
Notes:
It appears that the text was inadvertently swapped in the DESCRIPTION clauses for the ~Enabled and ~Disabled notification definitions.
ENTITY-STATE-MIB DEFINITIONS ::= BEGIN IMPORTS MODULE-IDENTITY, OBJECT-TYPE, NOTIFICATION-TYPE, mib-2 FROM SNMPv2-SMI DateAndTime FROM SNMPv2-TC MODULE-COMPLIANCE, OBJECT-GROUP, NOTIFICATION-GROUP FROM SNMPv2-CONF entPhysicalIndex FROM ENTITY-MIB EntityAdminState, EntityOperState, EntityUsageState, EntityAlarmStatus, EntityStandbyStatus FROM ENTITY-STATE-TC-MIB; entityStateMIB MODULE-IDENTITY LAST-UPDATED "200511220000Z" ORGANIZATION "IETF Entity MIB Working Group" CONTACT-INFO " General Discussion: entmib@ietf.org To Subscribe: http://www.ietf.org/mailman/listinfo/entmib http://www.ietf.org/html.charters/entmib-charter.html Sharon Chisholm Nortel Networks PO Box 3511 Station C Ottawa, Ont. K1Y 4H7 Canada schishol@nortel.com David T. Perkins 548 Qualbrook Ct San Jose, CA 95110 USA Phone: 408 394-8702 dperkins@snmpinfo.com " DESCRIPTION "This MIB defines a state extension to the Entity MIB. Copyright (C) The Internet Society 2005. This version of this MIB module is part of RFC 4268; see the RFC itself for full legal notices." REVISION "200511220000Z" DESCRIPTION "Initial version, published as RFC 4268." ::= { mib-2 131 } -- Entity State Objects entStateObjects OBJECT IDENTIFIER ::= { entityStateMIB 1 } entStateTable OBJECT-TYPE SYNTAX SEQUENCE OF EntStateEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "A table of information about state/status of entities. This is a sparse augment of the entPhysicalTable. Entries appear in this table for values of entPhysicalClass [RFC4133] that in this implementation are able to report any of the state or status stored in this table. " ::= { entStateObjects 1 } entStateEntry OBJECT-TYPE SYNTAX EntStateEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "State information about this physical entity." INDEX { entPhysicalIndex } ::= { entStateTable 1 } EntStateEntry ::= SEQUENCE { entStateLastChanged DateAndTime, entStateAdmin EntityAdminState, entStateOper EntityOperState, entStateUsage EntityUsageState, entStateAlarm EntityAlarmStatus, entStateStandby EntityStandbyStatus } entStateLastChanged OBJECT-TYPE SYNTAX DateAndTime MAX-ACCESS read-only STATUS current DESCRIPTION "The value of this object is the date and time when the value of any of entStateAdmin, entStateOper, entStateUsage, entStateAlarm, or entStateStandby changed for this entity. If there has been no change since the last re-initialization of the local system, this object contains the date and time of local system initialization. If there has been no change since the entity was added to the local system, this object contains the date and time of the insertion." ::= { entStateEntry 1 } entStateAdmin OBJECT-TYPE SYNTAX EntityAdminState MAX-ACCESS read-write STATUS current DESCRIPTION "The administrative state for this entity. This object refers to an entities administrative permission to service both other entities within its containment hierarchy as well other users of its services defined by means outside the scope of this MIB. Setting this object to 'notSupported' will result in an 'inconsistentValue' error. For entities that do not support administrative state, all set operations will result in an 'inconsistentValue' error. Some physical entities exhibit only a subset of the remaining administrative state values. Some entities cannot be locked, and hence this object exhibits only the 'unlocked' state. Other entities cannot be shutdown gracefully, and hence this object does not exhibit the 'shuttingDown' state. A value of 'inconsistentValue' will be returned if attempts are made to set this object to values not supported by its administrative model." ::= { entStateEntry 2 } entStateOper OBJECT-TYPE SYNTAX EntityOperState MAX-ACCESS read-only STATUS current DESCRIPTION "The operational state for this entity. Note that unlike the state model used within the Interfaces MIB [RFC2863], this object does not follow the administrative state. An administrative state of down does not predict an operational state of disabled. A value of 'testing' means that entity currently being tested and cannot therefore report whether it is operational or not. A value of 'disabled' means that an entity is totally inoperable and unable to provide service both to entities within its containment hierarchy, or to other receivers of its service as defined in ways outside the scope of this MIB. A value of 'enabled' means that an entity is fully or partially operable and able to provide service both to entities within its containment hierarchy, or to other receivers of its service as defined in ways outside the scope of this MIB. Note that some implementations may not be able to accurately report entStateOper while the entStateAdmin object has a value other than 'unlocked'. In these cases, this object MUST have a value of 'unknown'." ::= { entStateEntry 3 } entStateUsage OBJECT-TYPE SYNTAX EntityUsageState MAX-ACCESS read-only STATUS current DESCRIPTION "The usage state for this entity. This object refers to an entity's ability to service more physical entities in a containment hierarchy. A value of 'idle' means this entity is able to contain other entities but that no other entity is currently contained within this entity. A value of 'active' means that at least one entity is contained within this entity, but that it could handle more. A value of 'busy' means that the entity is unable to handle any additional entities being contained in it. Some entities will exhibit only a subset of the usage state values. Entities that are unable to ever service any entities within a containment hierarchy will always have a usage state of 'busy'. Some entities will only ever be able to support one entity within its containment hierarchy and will therefore only exhibit values of 'idle' and 'busy'." ::= { entStateEntry 4 } entStateAlarm OBJECT-TYPE SYNTAX EntityAlarmStatus MAX-ACCESS read-only STATUS current DESCRIPTION "The alarm status for this entity. It does not include the alarms raised on child components within its containment hierarchy. A value of 'unknown' means that this entity is unable to report alarm state. Note that this differs from 'indeterminate', which means that alarm state is supported and there are alarms against this entity, but the severity of some of the alarms is not known. If no bits are set, then this entity supports reporting of alarms, but there are currently no active alarms against this entity." ::= { entStateEntry 5 } entStateStandby OBJECT-TYPE SYNTAX EntityStandbyStatus MAX-ACCESS read-only STATUS current DESCRIPTION "The standby status for this entity. Some entities will exhibit only a subset of the remaining standby state values. If this entity cannot operate in a standby role, the value of this object will always be 'providingService'." ::= { entStateEntry 6 } -- Notifications entStateNotifications OBJECT IDENTIFIER ::= { entityStateMIB 0 } entStateOperEnabled NOTIFICATION-TYPE OBJECTS { entStateAdmin, entStateAlarm } STATUS current DESCRIPTION "An entStateOperEnabled notification signifies that the SNMP entity, acting in an agent role, has detected that the entStateOper object for one of its entities has transitioned into the 'enabled' state. The entity this notification refers can be identified by extracting the entPhysicalIndex from one of the variable bindings. The entStateAdmin and entStateAlarm varbinds may be examined to find out additional information on the administrative state at the time of the operation state change as well as to find out whether there were any known alarms against the entity at that time that may explain why the physical entity has become operationally disabled." ::= { entStateNotifications 1 } entStateOperDisabled NOTIFICATION-TYPE OBJECTS { entStateAdmin, entStateAlarm } STATUS current DESCRIPTION "An entStateOperDisabled notification signifies that the SNMP entity, acting in an agent role, has detected that the entStateOper object for one of its entities has transitioned into the 'disabled' state. The entity this notification refers can be identified by extracting the entPhysicalIndex from one of the variable bindings. The entStateAdmin and entStateAlarm varbinds may be examined to find out additional information on the administrative state at the time of the operation state change as well as to find out whether there were any known alarms against the entity at that time that may affect the physical entity's ability to stay operationally enabled." ::= { entStateNotifications 2 } -- Conformance and Compliance entStateConformance OBJECT IDENTIFIER ::= { entityStateMIB 2 } entStateCompliances OBJECT IDENTIFIER ::= { entStateConformance 1 } entStateCompliance MODULE-COMPLIANCE STATUS current DESCRIPTION "The compliance statement for systems supporting the Entity State MIB." MODULE -- this module MANDATORY-GROUPS { entStateGroup } GROUP entStateNotificationsGroup DESCRIPTION "This group is optional." OBJECT entStateAdmin MIN-ACCESS read-only DESCRIPTION "Write access is not required." ::= { entStateCompliances 1 } entStateGroups OBJECT IDENTIFIER ::= { entStateConformance 2 } entStateGroup OBJECT-GROUP OBJECTS { entStateLastChanged, entStateAdmin, entStateOper, entStateUsage, entStateAlarm, entStateStandby } STATUS current DESCRIPTION "Standard Entity State group." ::= { entStateGroups 1} entStateNotificationsGroup NOTIFICATION-GROUP NOTIFICATIONS { entStateOperEnabled, entStateOperDisabled } STATUS current DESCRIPTION "Standard Entity State Notification group." ::= { entStateGroups 2} END 6. Security Considerations The ENTITY-STATE-TC-MIB defined in section 4 does not define any management objects. Instead, it defines a set of textual conventions that may be used by other MIB modules to define management objects. Meaningful security considerations can only be written in the MIB modules that define management objects. The ENTITY-STATE-TC-MIB has therefore no impact on the security of the Internet. The ENTITY-STATE-MIB defined in section 5 defines one management object -- entStateAdmin -- that has a MAX-ACCESS clause of read- write. The object 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. Note that setting the entStateAdmin to 'locked' or 'shuttingDown' can cause disruption of services ranging from those running on a port to those on an entire device, depending on the type of entity. Access to this object should be properly protected. Access to the objects defined in this MIB allows one to figure out what the active and standby resources in a network are. This information can be used to optimize attacks on networks so even read-only access to this MIB should be properly protected. SNMP versions prior to SNMPv3 did not include adequate security. Even if the network itself is secure (for example by using IPsec), even then, there is no control as to who on the secure network is allowed to access and GET/SET (read/change/create/delete) the objects in this MIB module. It is RECOMMENDED that implementers consider the security features as provided by the SNMPv3 framework (see [RFC3410], section 8), including full support for the SNMPv3 cryptographic mechanisms (for authentication and privacy). 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 this MIB module is properly configured to give access to the objects only to those principals (entities) that have legitimate rights to indeed GET or SET (change/create/delete) them. 7. Acknowledgements This document is a product of the Entity MIB Working Group. 8. References 8.1. Normative References [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. [RFC2578] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J., Rose, M., and S. Waldbusser, "Structure of Management Information Version 2 (SMIv2)", STD 58, RFC 2578, April 1999. [RFC2579] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J., Rose, M., and S. Waldbusser, "Textual Conventions for SMIv2", STD 58, RFC 2579, April 1999. [RFC2580] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J., Rose, M., and S. Waldbusser, "Conformance Statements for SMIv2", STD 58, RFC 2580, April 1999. [RFC4133] Bierman, A. and K. McCloghrie, "Entity MIB (Version 3)", RFC 4133, August 2005. 8.2. Informative References [RFC2790] Waldbusser, S. and P. Grillo, "Host Resources MIB", RFC 2790, March 2000. [RFC2863] McCloghrie, K. and F. Kastenholz, "The Interfaces Group MIB using SMIv2", RFC 2863, June 2000. [RFC3410] Case, J., Mundy, R., Partain, D., and B. Stewart, "Introduction and Applicability Statements for Internet- Standard Management Framework", RFC 3410, December 2002. [RFC3877] Chisholm, S. and D. Romascanu, "Alarm Management Information Base (MIB)", RFC 3877, September 2004. [RFC4188] Norseth, K. and E. Bell, "Definitions of Managed Objects for Bridges", RFC 4188, September 2005. [X.731] ITU Recommendation X.731, "Information Technology - Open Systems Interconnection - System Management: State Management Function", 1992. Authors' Addresses Sharon Chisholm Nortel Networks PO Box 3511, Station C Ottawa, Ontario, K1Y 4H7 Canada EMail: schishol@nortel.com David T. Perkins 548 Qualbrook Ct San Jose, CA 95110 USA Phone: 408 394-8702 EMail: dperkins@snmpinfo.com Full Copyright Statement Copyright (C) The Internet Society (2005). This document is subject to the rights, licenses and restrictions contained in BCP 78, and except as set forth therein, the authors retain all their rights. This document and the information contained herein are provided on an "AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY AND THE INTERNET ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Intellectual Property The IETF takes no position regarding the validity or scope of any Intellectual Property Rights or other rights that might be claimed to pertain to the implementation or use of the technology described in this document or the extent to which any license under such rights might or might not be available; nor does it represent that it has made any independent effort to identify any such rights. Information on the procedures with respect to rights in RFC documents can be found in BCP 78 and BCP 79. Copies of IPR disclosures made to the IETF Secretariat and any assurances of licenses to be made available, or the result of an attempt made to obtain a general license or permission for the use of such proprietary rights by implementers or users of this specification can be obtained from the IETF on-line IPR repository at http://www.ietf.org/ipr. The IETF invites any interested party to bring to its attention any copyrights, patents or patent applications, or other proprietary rights that may cover technology that may be required to implement this standard. Please address the information to the IETF at ietf- ipr@ietf.org. Acknowledgement Funding for the RFC Editor function is currently provided by the Internet Society.
EID 826 (Verified) is as follows:

Section: 99

Original Text:

(1)

In the CONTACT-INFO clauses of both MODULE-IDENTITY instances
(page 6 and page 10), apparently a text line (between the two
HTTP URIs given) has been blanked out inadvertently; usually,
        "Working Group Charter:"
appears at similar places in other MIB definitions.


(2) [typo]

The DESCRIPTION clause of the EntityAlarmStatus TEXTUAL-CONVENTION
declaration contains a funny 'byte twist'.
 It says (near the middle of page 8):

       When the 'value of underRepair' is set, the resource is
       currently being repaired, ...

It should say:

       When the value of 'underRepair' is set, the resource is
       currently being repaired, ...


(3) 
In the DESCRIPTION clause of the entStateAdmin OBJECT-TYPE says:

    Setting this object to 'notSupported' will result in an 'inconsistentValue' error. [...]

It should say:

    Setting this object to 'unknown' will result in an 'inconsistentValue' error. [...]

Notes:


    This is inconsistent with the value range for the EntityAdminState
    TEXTUAL-CONVENTION describing the syntax of this object.
    (Perhaps there's some history behind the scene.)

(4) [typo/grammar]

The fourth paragraph of the DESCRIPTION clause of the entStateOper
OBJECT-TYPE, 10 text lines from the bottom of page 12, says:

       A value of 'testing' means that entity currently being
       tested and cannot therefore report whether it is
       operational or not.

It should perhaps better say:
                                                       vvvv
       A value of 'testing' means that entity currently is
       being tested and cannot therefore report whether it
       is operational or not.


(5) [editing omission?]

The DESCRIPTION clause of the entStateStandby OBJECT-TYPE, near
mid-page 14, says:

       Some entities will exhibit only a subset of the
       remaining standby state values.  [...]
       ^^^^^^^^^^
Perhaps this text has been 'cloned' without full adaptation.
Since, in this case, no possible value of the object has been
excluded by the text, the word "remaining" is inappropriate in
this context.  Therefore, this clause should better say:

       Some entities will exhibit only a subset of the
       standby state values.  [...]


(6) + (7)  [typo/grammar]

The second paragraph of the DESCRIPTION clause of each of the
two NOTIFICATION-TYPE declarations, near the bottom of page 14
and near the top of page 15, contains the sentence:

       The entity this notification refers can be identified by
       extracting the entPhysicalIndex from one of the
       variable bindings.  [...]

Preferrably, this sentence should better say (in both instances):

                                          vvvv
       The entity this notification refers to can be identified
       by extracting the entPhysicalIndex from one of the
       variable bindings.  [...]    

Corrected Text:

[see above]       
Notes:
from pending