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
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].
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.
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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].
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.
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.
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.
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.
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
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MIB. They can, though, be computed by examining the states of entities within this object's containment hierarchy and other available related states.
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.
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'.
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'.
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.
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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
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{ 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) }
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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) }
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"
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 }
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.
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" ::= { entStateObjects 1 }
entStateEntry OBJECT-TYPE SYNTAX EntStateEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "State information about this physical entity." INDEX { entPhysicalIndex } ::= { entStateTable 1 }
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.
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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
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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
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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 }
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 }
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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 }
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 }
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.
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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.
[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.
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[RFC4133] Bierman, A. and K. McCloghrie, "Entity MIB (Version 3)", RFC 4133, August 2005.
[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
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