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RFC 3877
Network Working Group S. Chisholm
Request for Comments: 3877 Nortel Networks
Category: Standards Track D. Romascanu
Avaya
September 2004
Alarm Management Information Base (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 (2004).
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 management objects used for modelling and
storing alarms.
Chisholm & Romascanu Standards Track [Page 1]
RFC 3877 Alarm MIB September 2004
Table of Contents
1. The Internet-Standard Management Framework . . . . . . . . . . 3
2. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Alarm Management Framework . . . . . . . . . . . . . . . . . . 4
3.1. Terminology. . . . . . . . . . . . . . . . . . . . . . . 4
3.2. Alarm Management Architecture. . . . . . . . . . . . . . 5
3.3. Features of this Architecture. . . . . . . . . . . . . . 5
3.4. Security . . . . . . . . . . . . . . . . . . . . . . . . 8
3.5. Relationship between Alarm and Notifications . . . . . . 9
3.6. Notification Varbind Storage and Reference . . . . . . . 9
3.7. Relation to Notification Log MIB . . . . . . . . . . . . 10
3.8. Relation to Event MIB. . . . . . . . . . . . . . . . . . 10
4. Generic Alarm MIB. . . . . . . . . . . . . . . . . . . . . . . 10
4.1. Overview . . . . . . . . . . . . . . . . . . . . . . . . 10
4.2. Definitions. . . . . . . . . . . . . . . . . . . . . . . 15
5. ITU Alarm. . . . . . . . . . . . . . . . . . . . . . . . . . . 38
5.1. Overview . . . . . . . . . . . . . . . . . . . . . . . . 38
5.2. IANA Considerations. . . . . . . . . . . . . . . . . . . 39
5.3. Textual Conventions. . . . . . . . . . . . . . . . . . . 47
5.4. Definitions. . . . . . . . . . . . . . . . . . . . . . . 49
6. Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
6.1. Alarms Based on linkUp/linkDown Notifications. . . . . . 59
6.2. Temperature Alarm using generic Notifications. . . . . . 62
6.3. Temperature Alarm without Notifications. . . . . . . . . 63
6.4. Printer MIB Alarm Example. . . . . . . . . . . . . . . . 65
6.5. Rmon Alarm Example . . . . . . . . . . . . . . . . . . . 66
6.6. The Lifetime of an Alarm . . . . . . . . . . . . . . . . 67
7. Security Considerations. . . . . . . . . . . . . . . . . . . . 70
8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 72
9. References . . . . . . . . . . . . . . . . . . . . . . . . . . 72
9.1. Normative References . . . . . . . . . . . . . . . . . . 72
9.2. Informative References . . . . . . . . . . . . . . . . . 73
10. Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . 74
11. Full Copyright Statement . . . . . . . . . . . . . . . . . . . 75
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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. Introduction
In traditional SNMP management, problems are detected on an entity
either through polling interesting MIB variables, waiting for the
entity to send a Notification for a problem, or some combination of
the two. This method is somewhat successful, but experience has
shown some problems with this approach. Managers monitoring large
numbers of entities cannot afford to be polling large numbers of
objects on each device. Managers trying to ensure high reliability
are unable to accurately determine whether any problems had occurred
when they were not monitoring an entity. Finally, it can be time
consuming for managers to try to understand the relationships between
the various objects they poll, the Notifications they receive and the
problems occurring on the entity. Even after detailed analysis they
may still be left with an incomplete picture of what problems are
occurring. But, it is important for an operator to be able to
determine current problems on a system, so they can be fixed.
This memo describes a method of using alarm management in SNMP to
address these problems. It also provides the necessary MIB objects
to support this method.
Alarms and other terms related to alarm management are defined in the
following sections.
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 BCP 14, RFC 2119
[RFC2119].
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3. Alarm Management Framework
3.1. Terminology
Error
A deviation of a system from normal operation.
Fault
Lasting error or warning condition.
Event
Something that happens which may be of interest. A fault, a
change in status, crossing a threshold, or an external input to
the system, for example.
Notification
Unsolicited transmission of management information.
Alarm
Persistent indication of a fault.
Alarm State
A condition or stage in the existence of an alarm. As a minimum,
alarms states are raise and clear. They could also include
severity information such as defined by perceived severity in the
International Telecommunications Union (ITU) model [M.3100] -
cleared, indeterminate, critical, major, minor and warning.
Alarm Raise
The initial detection of the fault indicated by an alarm or any
number of alarm states later entered, except clear.
Alarm Clear
The detection that the fault indicated by an alarm no longer
exists.
Active Alarm
An alarm which has an alarm state that has been raised, but not
cleared.
Alarm Detection Point
The entity that detected the alarm.
Perceived Severity
The severity of the alarm as determined by the alarm detection
point using the information it has available.
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3.2. Alarm Management Architecture
+------------------------------------------------+
| |
| +------------------------------------+ |
| | Notification Management | |
| +------------------------------------+ |
| | |
+------------------------------------------------+
|
|
|
|<----------------------------------------------+
| |
+------------------V-------------+ |
| +---------------V-----------+ | |
| | RFC 3413 | | |
| | SNMP-NOTIFICATION-MIB | | |
| +--------+--------------+-+-+ | |
| | | | | |
| | | +------------------+ |
| | | | | |
| | | | +----------V--------------+ |
| | | | | +--------V---------+ | |
| +---------V------------+ | | | | Alarm Modelling | | |
| | RFC 3014 | | | | | (descriptions) | | |
| | NOTIFICATION-LOG-MIB | | | | +--------+---------+ | |
| +----------------------+ | | | | | |
| | | | +--------V------------+ | |
| +------------------------V-+ | | | Generic: Model- | | |
| | RFC 3413 | | | | Active : Specific | | |
| | SNMP-TARGET-MIB | | | | Alarms : Extensions | | |
| +----------+---------------+ | | +--------+------------+ | |
| | | | | | |
+------------|-------------------+ +----------|--------------+ |
| | |
| +------------------+
V
Informs & Traps
3.3. Features of this Architecture
3.3.1. Modular Alarm Architecture
The subject of alarm management can potentially cover a large number
of topics including real-time alarms, historical alarms, alarm
correlation, and alarm suppression, to name a few. Within each of
these topics, there are a number of established models that could be
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supported. This memo focuses on a subset of this problem space, but
describes a modular SNMP alarm management framework. Alarms SHOULD
be modelled so Notifications are sent on alarm Clear.
The framework defines a generic Alarm MIB that can be supported on
its own, or with additional alarm modelling information such as the
provided ITU Alarm MIB. In addition, the active alarm tables could
also be extended to support additional information about active alarm
instances. This framework can also be expanded in the future to
support such features as alarm correlation and alarm suppression.
This modular architecture means that the cost of supporting alarm
management features is proportional to the number of features an
implementation supports.
3.3.2. Flexible Alarm Modelling
Alarm models document an understanding between a manager and an agent
as to what problems will be reported on a system, how these problems
will be reported, and what might possibly happen over the lifetime of
this problem.
The alarm modelling method provided in this memo provides flexibility
to support implementations with different modelling requirements.
All alarms are modelled as a series of states that are related
together using an alarm ID. Alarm states can be modelled using
traditional Notifications, generic alarm Notifications, or without
the use of Notifications.
Alarm states modelled using traditional Notifications would specify a
Notification Object Identifier, and optionally an (offset, value)
pair of one of the Notification varbinds to identify the state. This
alarm state would be entered when the entity generated a Notification
that matched this information and the alarm would be added to the
active alarm table. This Notification would also get sent on the
wire to any destinations, as indicated in the SNMP-TARGET-MIB and
SNMP-NOTIFICATION-MIB [RFC3413].
Alarm states modelled using generic Notifications use the
alarmActiveState or alarmClearState Notifications defined in this
memo. These alarm states would be entered after being triggered by a
stimulus outside the scope of this memo, the alarm would be added to
the active alarm table and these generic Notifications would then be
sent on the wire to any destinations, as indicated in the SNMP-
TARGET-MIB and SNMP-NOTIFICATION-MIB [RFC3413].
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Alarm states modelled without any Notifications would be triggered by
some stimulus outside the scope of this memo, the alarm would be
added to the active alarm table, but no Notifications would be sent
to interested managers.
3.3.3. Problem Indication
The Alarm MIB provides a means to determine whether a given
notification is of interest to managers for purposes of alarm
management by permitting inspection of the alarm models. If no
entries in the alarmModelTable could match a particular notification,
then that notification is not relevant to the alarm models defined.
In addition, information in the alarm model, such as the Notification
ID and the description tell exactly what error or warning condition
this alarm is indicating. If the ITU-ALARM-MIB is also supported,
additional information is provided via the probable cause.
3.3.5. Identifying Resource under Alarm
An important goal of alarm management is to ensure that any detected
problems get fixed, so it is necessary to know exactly where this
problem is occurring. In addition, it is necessary to be able to
tell when alarm instances are raised against the same component, as
well as to be able to tell what instance of an alarm is cleared by an
instance of an alarm clear.
The Alarm MIB provides a generic method for identifying the resource
by extracting and building a resource ID from the Notification
varbinds. It records the relevant information needed to locate the
source of the alarm.
3.3.6. Means of obtaining ITU alarm information
Alarm Information, as defined in ITU alarm models [M.3100], is
optionally available to implementations through the optional support
of the ITU-ALARM-MIB.
3.3.7. Configuration of Alarm Models
An alarm model can be added and removed during runtime. It can be
modified assuming it is not being referenced by any active alarm
instance.
3.3.8. Active Alarm Management
A list of currently active alarms and supporting statistics on the
SNMP entity can be obtained.
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This allows the network management station to find out about any
problems that may have occurred before it started managing a
particular network element, or while it was out of contact with it.
3.3.9. Distributed Alarm Management
All aspects of the Alarm MIB can be supported both on the device
experiencing the alarms and on any mid-level managers that might be
monitoring such devices.
3.3.10. Historical Alarm Management
Some systems may have a requirement that information on alarms that
are no longer active is available. This memo provides a clear table
to support this requirement.
This can also be achieved through the support of the Notification Log
MIB [RFC3014] to store alarm state transitions.
3.4. Security
Given the nature of VACM, security for alarms is awkward since access
control for the objects in the underlying Notifications can be
checked only where the Notification is created. Thus such checking
is possible only for locally generated Notifications, and even then
only when security credentials are available.
For the purpose of this discussion, "security credentials" means the
input values for the abstract service interface function
isAccessAllowed [RFC3411] and using those credentials means
conceptually using that function to see that those credentials allow
access to the MIB objects in question, operating as for a
Notification Originator in [RFC3413].
The Alarm MIB has the notion of a named alarm list. By using alarm
list names and view-based access control [RFC3415] a network
administrator can provide different access for different users. When
an application creates an alarm model (indexed in part by the alarm
list name) the security credentials of the creator remain associated
with that alarm model and constrain what information is allowed to be
placed in the active alarm table, the active alarm variable table,
the cleared alarm table, and the ITU alarm table.
When processing locally-generated Notifications, the managed system
MUST use the security credentials associated with each alarm model
respectively, and MUST apply the same access control rules as
described for a Notification Originator in [RFC3413].
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The managed system SHOULD NOT apply access control when processing
remotely-generated Notifications using the alarm models. In those
cases the security of the information in the alarm tables SHOULD be
left to the normal, overall access control for those tables.
3.5. Relationship between Alarm and Notifications
It is important to understand the relationship between alarms and
Notifications, as both are traditional fault management methods.
This relationship is modelled using the alarmModelTable to define the
alarmModelNotificationId for each alarm state.
Not all Notifications signal an alarm state transition. Some
Notifications are simply informational in nature, such as those that
indicate that a configuration operation has been performed on an
entity. These sorts of Notifications would not be represented in the
Alarm MIB.
The Alarm MIB allows the use of the Notification space as defined in
[RFC2578] in order to identify the Notifications that are related
with the specific alarm state transitions. However there is no
assumption that the respective Notifications must be sent for all or
any of the alarm state transitions. It is also possible to model
alarms using no Notifications at all. This architecture allows for
both the efficient exploitation of the body of defined Notification
and for the use of non-Notification based systems.
3.6. Notification Varbind Storage and Reference
In SNMPv1 [RFC1157], the varbinds in the Trap-PDU sent over the wire
map one to one into those varbinds listed in the SMI of the trap in
the MIB in which it was defined [RFC1215]. In the case of linkDown
trap, the first varbind can unambiguously be identified as ifIndex.
With the introduction of the InformRequest-PDU and SNMPv2-Trap-PDU
types, which send sysUptime and snmpTrapOID as the first two
varbinds, while the SMI in the MIB where the Notification is defined
only lists additional varbinds, the meaning of "first varbind"
becomes less clear. In the case of the linkDown Notification,
referring to the first varbind could potentially be interpreted as
either the sysUptime or ifIndex.
The varbind storage approach taken in the Alarm MIB is that sysUptime
and snmpTrapOID SHALL always be stored in the active alarm variable
table as entry 1 and 2 respectively, regardless of whether the
transport was the Trap-PDU, the InformRequest-PDU or the SNMPv2-
Trap-PDU. If the incoming Notification is an SNMPv1 Trap-PDU then an
appropriate value for sysUpTime.0 or snmpTrapOID.0 shall be
determined by using the rules in section 3.1 of [RFC3584].
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The varbind reference approach taken in the Alarm MIB is that, for
variables such as the alarmModelVarbindIndex, the first two
obligatory varbinds of the InformRequest-PDU and SNMPv2-Trap-PDU need
to be considered so the index values of the Trap-PDU and the SMI need
be adjusted by two. In the case of linkDown, the third varbind would
always be ifIndex.
3.7. Relation to Notification Log MIB
The Alarm MIB is intended to complement the Notification Log MIB
[RFC3014], but can be used independently. The alarmActiveTable is
defined in manner similar to that of the nlmLogTable. This format
allows for the storage of any Trap or Notification type that can be
defined using the SMI, or can be carried by SNMP. Using the same
format as the Notification Log MIB also simplifies operations for
systems choosing to implement both MIBs.
The object alarmActiveLogPointer points, for each entry in the
alarmActiveLogTable, to the log index in the Notification Log MIB, if
used.
If the Notification Log MIB is supported, it can be monitored by a
management system as a hedge against lost alarms. The Notification
Log can also be used to support historical alarm management.
3.8. Relationship with the Event MIB
During the work and discussions in the Working Group, the issue of
the relationship between the MIB modules and the Event MIB [RFC2981]
was raised. There is no direct relation or dependency between the
Alarm MIB and the Event MIB. Some common terms (like 'event') are
being used in both MIB modules, and the user is directed to the
sections that define terminology in the two documents for
clarification.
4. Generic Alarm MIB
4.1. Overview
The ALARM-MIB consists of alarm models and lists of active and
cleared alarms.
The alarmModelTable contains information that is applicable to all
instances of an alarm. It can be populated at start-up with all
alarms that could happen on a system or later configured by a
management application. It contains all the alarms for a given
system. If a Notification is not represented in the alarmModelTable,
it is not an alarm state transition. The alarmModelTable provides a
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means of defining the raise/clear and other state transition
relationships between alarm states. The alarmModelIndex acts as a
unique identifier for an alarm. An alarm model consists of
definitions of the possible states an alarm can assume as well as the
Object Identifier (OID) of the Notification associated with this
alarm state. The object alarmModelState defines the states of an
alarm.
The alarmActiveTable contains a list of alarms that are currently
occurring on a system. It is intended that this table be queried
upon device discovery and rediscovery to determine which alarms are
currently active on the device.
The alarmActiveVariableTable contains the Notification variable
bindings associated with the alarms in the alarmActiveTable.
The alarmActiveStatsTable contains current and total raised alarm
counts as well as the time of the last alarm raise and alarm clears
per named alarm list.
The alarmClearTable contains recently cleared alarms. It contains up
to alarmClearMaximum cleared alarms.
The MIB also defines generic alarm Notifications that can be used
when there is not an existing applicable Notification to signal the
alarm state transition - alarmActiveState and alarmClearState.
4.1.1. Extensibility
The relationship between the Alarm MIB and the other alarm model MIB
modules is expressed by the following: The alarmModelTable has a
corresponding table in the specific MIB. For each row in the
specific MIB alarm model table there is one row in the
alarmModelTable. The alarmActiveTable has a corresponding table in
the specific MIBs. For each row in the specific MIB active alarm
table, there is one row in the alarmActiveTable. The
alarmModelSpecificPointer object in the alarmModelTable points to the
specific model entry in an extended alarm model table corresponding
to this particular alarm. The alarmActiveSpecificPointer object in
the alarmActiveTable points to the specific active alarm entry in an
extended active alarm table corresponding to this particular alarm
instance.
Additional extensions can be defined by defining an AUGMENTATION of
either the Alarm or ITU Alarm tables. As the alarm model table only
provides a mechanism to point at one specific alarm model, additional
specific models SHOULD define another mechanism to map from the
generic alarm model to the additional model.
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4.1.2. Problem Indication
The problem that each alarm indicates is identified through the
Object Identifier of the NotificationId of the state transition, and,
optionally, the ITU parameters. alarmModelDescription provides a
description of the alarm state suitable for displaying to an
operator.
4.1.3. Alarm State Transition Notification
The SNMP-TARGET-MIB [RFC3413] provides the ability to specify which
managers, if any, receive Notifications of problems. Solutions can
therefore use the features of this MIB to change the Notification
behaviour of their implementations. Specifying target hosts in this
MIB along with specifying notifications in the
alarmModelNotificationId would allow Notifications to be logged and
sent out to management stations in an architecture as described in
section 3.2. Specifying no target hosts in this MIB along with
specifying notifications in the alarmModelNotificationId would allow
Notifications to be logged but not sent out to management stations in
an architecture as described in section 3.2. Regardless of what is
defined in the SNMP-TARGET-MIB, specifying { 0 0 } in the
alarmModelNotificationId would result in no notifications being
logged or sent to management stations as a consequence of this
particular alarm state transition.
Alarms are modelled by defining all possible states in the
alarmModelTable, as well as defining alarmModelNotificationId,
alarmModelVarbindIndex, and alarmModelVarbindValue for each of the
possible alarm states. Optionally, ituAlarmPerceivedSeverity models
the states in terms of ITU perceived severity.
4.1.4. Active Alarm Resource Identifier
Resources under alarm can be identified using the
alarmActiveResourceId. This OBJECT IDENTIFIER points to an
appropriate object to identify the given resource, depending on the
type of the resource.
The consumer of the alarmActiveResourceId does not necessarily need
to know the type of the resource in the resource ID, but if they want
to know this, examining the content of the resource ID can derive it
- 1.3.6.1.2.1.2.2.1.1.something is an interface, for example. It is
therefore good practice to use resource IDs that can be consistently
used across technologies, such as ifIndex, entPhysicalIndex or
sysApplRunIndex, to minimize the number of resource prefixes a
manager interested in a resource type needs to learn.
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Resource ID can be calculated using the alarmModelResourcePrefix,
alarmModelVarbindSubtree and the Notification varbinds. This allows
for both the managed element to be able to compute and populate the
alarmActiveResourceId object and for the manager to be able to
determine when two separate alarm instances are referring to the same
resource.
If alarmModelResourcePrefix has a value of 0.0, then
alarmActiveResourceId is simply the variable identifier of the first
Notification varbind that matches the prefix defined in
alarmModelVarbindSubtree. Otherwise, alarmActiveResourceId is
calculated by appending the instance information from the first
Notification varbind that matches alarmModelVarbindSubtree to the
prefix defined in alarmModelResourcePrefix. The instance information
is the portion of the variable identifier following the part that
matched alarmModelVarbindSubtree. If no match is found, then
alarmActiveResourceId is simply the value of
alarmModelResourcePrefix.
In addition to this, the variable bindings from the Notifications
that signal the alarm state transitions are stored in the active
alarm variable table. This allows for implementations familiar with
the particular Notifications to implement other forms of resource
identification.
For Example:
A) Consider an alarm modelled using the authenticationFailure
[RFC3418] Notification.
authenticationFailure NOTIFICATION-TYPE
STATUS current
DESCRIPTION
"An authenticationFailure trap signifies that the SNMPv2
entity, acting in an agent role, has received a protocol
message that is not properly authenticated. While all
implementations of the SNMPv2 must be capable of generating
this trap, the snmpEnableAuthenTraps object indicates
whether this trap will be generated."
::= { snmpTraps 5 }
To set the resource ID to be usmStats, 1.3.6.1.6.3.15.1.1,
configure as follows:
alarmModelVarbindSubtree = 0.0
alarmModelResourcePrefix = usmStats (1.3.6.1.6.3.15.1.1)
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B) Consider an alarm modelled using linkDown [RFC2863]
linkDown NOTIFICATION-TYPE
OBJECTS { ifIndex, ifAdminStatus, ifOperStatus }
STATUS current
DESCRIPTION
""
::= { snmpTraps 3 }
To set the resource Id to be the ifIndex, configure as follows:
alarmModelVarbindSubtree = ifIndex (1.3.6.1.2.1.2.2.1.1)
alarmModelResourcePrefix = 0.0
Alternatively, since ifIndex is the first varbind, the following
would also work, but might be less meaningful to a human reader
of the MIB table:
alarmModelVarbindSubtree = 0.0
alarmModelResourcePrefix = 0.0
C) Consider an alarm modelled using the bgpBackwardTransition
[RFC1657] Notification.
bgpBackwardTransition NOTIFICATION-TYPE
OBJECTS { bgpPeerLastError,
bgpPeerState }
STATUS current
DESCRIPTION
"The BGPBackwardTransition Event is generated
when the BGP FSM moves from a higher numbered
state to a lower numbered state."
::= { bgpTraps 2 }
To set the resource Id to be the bgpPeerRemoteAddr, the index to
the bgpTable, where bgpPeerState resides, configure as follows:
alarmModelVarbindSubtree = bgpPeerState
(1.3.6.1.2.1.15.3.1.2)
alarmModelResourcePrefix = bgpPeerRemoteAddr
(1.3.6.1.2.1.15.3.1.7)
4.1.5. Configurable Alarm Models
The alarm model table SHOULD be initially populated by the system.
The objects in alarmModelTable and ituAlarmTable have a MAX-ACCESS of
read-create, which allows managers to modify the alarm models to suit
their requirements.
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4.1.6. Active Alarm Management
Lists of alarms currently active on an SNMP entity are stored in the
alarmActiveTable and, optionally, a model specific alarmTable, e.g.,
the ituAlarmActiveTable.
4.1.7. Distributed Alarm Management
Distributed alarm management can be achieved by support of the Alarm
MIB on both the alarm detection point and on the mid-level manager.
This is facilitated by the ability to be able to store different
named alarm lists. A mid-level manager could create an alarmListName
for each of the devices it manages and therefore store separate lists
for each device. In addition, the context and IP addresses of the
alarm detection point are stored in the alarmActiveTable.
4.2. Definitions
ALARM-MIB DEFINITIONS ::= BEGIN
IMPORTS
MODULE-IDENTITY, OBJECT-TYPE, NOTIFICATION-TYPE,
Integer32, Unsigned32, Gauge32,
TimeTicks, Counter32, Counter64,
IpAddress, Opaque, mib-2,
zeroDotZero
FROM SNMPv2-SMI -- [RFC2578]
DateAndTime,
RowStatus, RowPointer,
TEXTUAL-CONVENTION
FROM SNMPv2-TC -- [RFC2579]
SnmpAdminString
FROM SNMP-FRAMEWORK-MIB -- [RFC3411]
InetAddressType, InetAddress
FROM INET-ADDRESS-MIB -- [RFC3291]
MODULE-COMPLIANCE, OBJECT-GROUP,
NOTIFICATION-GROUP
FROM SNMPv2-CONF -- [RFC2580]
ZeroBasedCounter32
FROM RMON2-MIB; -- [RFC2021]
alarmMIB MODULE-IDENTITY
LAST-UPDATED "200409090000Z" -- September 09, 2004
ORGANIZATION "IETF Distributed Management Working Group"
CONTACT-INFO
"WG EMail: disman@ietf.org
Subscribe: disman-request@ietf.org
http://www.ietf.org/html.charters/disman-charter.html
Chisholm & Romascanu Standards Track [Page 15]
RFC 3877 Alarm MIB September 2004
Chair: Randy Presuhn
randy_presuhn@mindspring.com
Editors: Sharon Chisholm
Nortel Networks
PO Box 3511 Station C
Ottawa, Ont. K1Y 4H7
Canada
schishol@nortelnetworks.com
Dan Romascanu
Avaya
Atidim Technology Park, Bldg. #3
Tel Aviv, 61131
Israel
Tel: +972-3-645-8414
Email: dromasca@avaya.com"
DESCRIPTION
"The MIB module describes a generic solution
to model alarms and to store the current list
of active alarms.
Copyright (C) The Internet Society (2004). The
initial version of this MIB module was published
in RFC 3877. For full legal notices see the RFC
itself. Supplementary information may be available on:
http://www.ietf.org/copyrights/ianamib.html"
REVISION "200409090000Z" -- September 09, 2004
DESCRIPTION
"Initial version, published as RFC 3877."
::= { mib-2 118 }
alarmObjects OBJECT IDENTIFIER ::= { alarmMIB 1 }
alarmNotifications OBJECT IDENTIFIER ::= { alarmMIB 0 }
alarmModel OBJECT IDENTIFIER ::= { alarmObjects 1 }
alarmActive OBJECT IDENTIFIER ::= { alarmObjects 2 }
alarmClear OBJECT IDENTIFIER ::= { alarmObjects 3 }
-- Textual Conventions
-- ResourceId is intended to be a general textual convention
-- that can be used outside of the set of MIBs related to
-- Alarm Management.
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RFC 3877 Alarm MIB September 2004
ResourceId ::= TEXTUAL-CONVENTION
STATUS current
DESCRIPTION
"A unique identifier for this resource.
The type of the resource can be determined by looking
at the OID that describes the resource.
Resources must be identified in a consistent manner.
For example, if this resource is an interface, this
object MUST point to an ifIndex and if this resource
is a physical entity [RFC2737], then this MUST point
to an entPhysicalDescr, given that entPhysicalIndex
is not accessible. In general, the value is the
name of the instance of the first accessible columnar
object in the conceptual row of a table that is
meaningful for this resource type, which SHOULD
be defined in an IETF standard MIB."
SYNTAX OBJECT IDENTIFIER
-- LocalSnmpEngineOrZeroLenStr is intended to be a general
-- textual convention that can be used outside of the set of
-- MIBs related to Alarm Management.
LocalSnmpEngineOrZeroLenStr ::= TEXTUAL-CONVENTION
STATUS current
DESCRIPTION
"An SNMP Engine ID or a zero-length string. The
instantiation of this textual convention will provide
guidance on when this will be an SNMP Engine ID and
when it will be a zero lengths string"
SYNTAX OCTET STRING (SIZE(0 | 5..32))
-- Alarm Model
alarmModelLastChanged OBJECT-TYPE
SYNTAX TimeTicks
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The value of sysUpTime at the time of the last
creation, deletion or modification of an entry in
the alarmModelTable.
If the number and content of entries has been unchanged
since the last re-initialization of the local network
management subsystem, then the value of this object
MUST be zero."
Chisholm & Romascanu Standards Track [Page 17]
RFC 3877 Alarm MIB September 2004
::= { alarmModel 1 }
alarmModelTable OBJECT-TYPE
SYNTAX SEQUENCE OF AlarmModelEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A table of information about possible alarms on the system,
and how they have been modelled."
::= { alarmModel 2 }
alarmModelEntry OBJECT-TYPE
SYNTAX AlarmModelEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Entries appear in this table for each possible alarm state.
This table MUST be persistent across system reboots."
INDEX { alarmListName, alarmModelIndex, alarmModelState }
::= { alarmModelTable 1 }
AlarmModelEntry ::= SEQUENCE {
alarmModelIndex Unsigned32,
alarmModelState Unsigned32,
alarmModelNotificationId OBJECT IDENTIFIER,
alarmModelVarbindIndex Unsigned32,
alarmModelVarbindValue Integer32,
alarmModelDescription SnmpAdminString,
alarmModelSpecificPointer RowPointer,
alarmModelVarbindSubtree OBJECT IDENTIFIER,
alarmModelResourcePrefix OBJECT IDENTIFIER,
alarmModelRowStatus RowStatus
}
alarmModelIndex OBJECT-TYPE
SYNTAX Unsigned32 (1..4294967295)
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An integer that acts as an alarm Id
to uniquely identify each alarm
within the named alarm list. "
::= { alarmModelEntry 1 }
alarmModelState OBJECT-TYPE
SYNTAX Unsigned32 (1..4294967295)
MAX-ACCESS not-accessible
STATUS current
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RFC 3877 Alarm MIB September 2004
DESCRIPTION
"A value of 1 MUST indicate a clear alarm state.
The value of this object MUST be less than the
alarmModelState of more severe alarm states for
this alarm. The value of this object MUST be more
than the alarmModelState of less severe alarm states
for this alarm."
::= { alarmModelEntry 2 }
alarmModelNotificationId OBJECT-TYPE
SYNTAX OBJECT IDENTIFIER
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The NOTIFICATION-TYPE object identifier of this alarm
state transition. If there is no notification associated
with this alarm state, the value of this object MUST be
'0.0'"
DEFVAL { zeroDotZero }
::= { alarmModelEntry 3 }
alarmModelVarbindIndex OBJECT-TYPE
SYNTAX Unsigned32
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The index into the varbind listing of the notification
indicated by alarmModelNotificationId which helps
signal that the given alarm has changed state.
If there is no applicable varbind, the value of this
object MUST be zero.
Note that the value of alarmModelVarbindIndex acknowledges
the existence of the first two obligatory varbinds in
the InformRequest-PDU and SNMPv2-Trap-PDU (sysUpTime.0
and snmpTrapOID.0). That is, a value of 2 refers to
the snmpTrapOID.0.
If the incoming notification is instead an SNMPv1 Trap-PDU,
then an appropriate value for sysUpTime.0 or snmpTrapOID.0
shall be determined by using the rules in section 3.1 of
[RFC3584]"
DEFVAL { 0 }
::= { alarmModelEntry 4 }
alarmModelVarbindValue OBJECT-TYPE
SYNTAX Integer32
MAX-ACCESS read-create
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STATUS current
DESCRIPTION
"The value that the varbind indicated by
alarmModelVarbindIndex takes to indicate
that the alarm has entered this state.
If alarmModelVarbindIndex has a value of 0, so
MUST alarmModelVarbindValue.
"
DEFVAL { 0 }
::= { alarmModelEntry 5 }
alarmModelDescription OBJECT-TYPE
SYNTAX SnmpAdminString
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"A brief description of this alarm and state suitable
to display to operators."
DEFVAL { "" }
::= { alarmModelEntry 6 }
alarmModelSpecificPointer OBJECT-TYPE
SYNTAX RowPointer
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"If no additional, model-specific Alarm MIB is supported by
the system the value of this object is `0.0'and attempts
to set it to any other value MUST be rejected appropriately.
When a model-specific Alarm MIB is supported, this object
MUST refer to the first accessible object in a corresponding
row of the model definition in one of these model-specific
MIB and attempts to set this object to { 0 0 } or any other
value MUST be rejected appropriately."
DEFVAL { zeroDotZero }
::= { alarmModelEntry 7 }
alarmModelVarbindSubtree OBJECT-TYPE
SYNTAX OBJECT IDENTIFIER
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The name portion of each VarBind in the notification,
in order, is compared to the value of this object.
If the name is equal to or a subtree of the value
of this object, for purposes of computing the value
Chisholm & Romascanu Standards Track [Page 20]
RFC 3877 Alarm MIB September 2004
of AlarmActiveResourceID the 'prefix' will be the
matching portion, and the 'indexes' will be any
remainder. The examination of varbinds ends with
the first match. If the value of this object is 0.0,
then the first varbind, or in the case of v2, the
first varbind after the timestamp and the trap
OID, will always be matched.
"
DEFVAL { zeroDotZero }
::= { alarmModelEntry 8 }
alarmModelResourcePrefix OBJECT-TYPE
SYNTAX OBJECT IDENTIFIER
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The value of AlarmActiveResourceId is computed
by appending any indexes extracted in accordance
with the description of alarmModelVarbindSubtree
onto the value of this object. If this object's
value is 0.0, then the 'prefix' extracted is used
instead.
"
DEFVAL { zeroDotZero }
::= { alarmModelEntry 9 }
alarmModelRowStatus OBJECT-TYPE
SYNTAX RowStatus
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"Control for creating and deleting entries. Entries may be
modified while active. Alarms whose alarmModelRowStatus is
not active will not appear in either the alarmActiveTable
or the alarmClearTable. Setting this object to notInService
cannot be used as an alarm suppression mechanism. Entries
that are notInService will disappear as described in RFC2579.
This row can not be modified while it is being
referenced by a value of alarmActiveModelPointer. In these
cases, an error of `inconsistentValue' will be returned to
the manager.
This entry may be deleted while it is being
referenced by a value of alarmActiveModelPointer. This results
in the deletion of this entry and entries in the active alarms
referencing this entry via an alarmActiveModelPointer.
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RFC 3877 Alarm MIB September 2004
As all read-create objects in this table have a DEFVAL clause,
there is no requirement that any object be explicitly set
before this row can become active. Note that a row consisting
only of default values is not very meaningful."
::= { alarmModelEntry 10 }
-- Active Alarm Table --
alarmActiveLastChanged OBJECT-TYPE
SYNTAX TimeTicks
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The value of sysUpTime at the time of the last
creation or deletion of an entry in the alarmActiveTable.
If the number of entries has been unchanged since the
last re-initialization of the local network management
subsystem, then this object contains a zero value."
::= { alarmActive 1 }
alarmActiveOverflow OBJECT-TYPE
SYNTAX Counter32
UNITS "active alarms"
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of active alarms that have not been put into
the alarmActiveTable since system restart as a result
of extreme resource constraints."
::= { alarmActive 5 }
alarmActiveTable OBJECT-TYPE
SYNTAX SEQUENCE OF AlarmActiveEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A table of Active Alarms entries."
::= { alarmActive 2 }
alarmActiveEntry OBJECT-TYPE
SYNTAX AlarmActiveEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Entries appear in this table when alarms are raised. They
are removed when the alarm is cleared.
If under extreme resource constraint the system is unable to
Chisholm & Romascanu Standards Track [Page 22]
RFC 3877 Alarm MIB September 2004
add any more entries into this table, then the
alarmActiveOverflow statistic will be increased by one."
INDEX { alarmListName, alarmActiveDateAndTime,
alarmActiveIndex }
::= { alarmActiveTable 1 }
AlarmActiveEntry ::= SEQUENCE {
alarmListName SnmpAdminString,
alarmActiveDateAndTime DateAndTime,
alarmActiveIndex Unsigned32,
alarmActiveEngineID LocalSnmpEngineOrZeroLenStr,
alarmActiveEngineAddressType InetAddressType,
alarmActiveEngineAddress InetAddress,
alarmActiveContextName SnmpAdminString,
alarmActiveVariables Unsigned32,
alarmActiveNotificationID OBJECT IDENTIFIER,
alarmActiveResourceId ResourceId,
alarmActiveDescription SnmpAdminString,
alarmActiveLogPointer RowPointer,
alarmActiveModelPointer RowPointer,
alarmActiveSpecificPointer RowPointer }
alarmListName OBJECT-TYPE
SYNTAX SnmpAdminString (SIZE(0..32))
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The name of the list of alarms. This SHOULD be the same as
nlmLogName if the Notification Log MIB [RFC3014] is supported.
This SHOULD be the same as, or contain as a prefix, the
applicable snmpNotifyFilterProfileName if the
SNMP-NOTIFICATION-MIB DEFINITIONS [RFC3413] is supported.
An implementation may allow multiple named alarm lists, up to
some implementation-specific limit (which may be none). A
zero-length list name is reserved for creation and deletion
by the managed system, and MUST be used as the default log
name by systems that do not support named alarm lists."
::= { alarmActiveEntry 1 }
alarmActiveDateAndTime OBJECT-TYPE
SYNTAX DateAndTime
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The local date and time when the error occurred.
This object facilitates retrieving all instances of
Chisholm & Romascanu Standards Track [Page 23]
RFC 3877 Alarm MIB September 2004
alarms that have been raised or have changed state
since a given point in time.
Implementations MUST include the offset from UTC,
if available. Implementation in environments in which
the UTC offset is not available is NOT RECOMMENDED."
::= { alarmActiveEntry 2 }
alarmActiveIndex OBJECT-TYPE
SYNTAX Unsigned32 (1..4294967295)
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A strictly monotonically increasing integer which
acts as the index of entries within the named alarm
list. It wraps back to 1 after it reaches its
maximum value."
::= { alarmActiveEntry 3 }
alarmActiveEngineID OBJECT-TYPE
SYNTAX LocalSnmpEngineOrZeroLenStr
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The identification of the SNMP engine at which the alarm
originated. If the alarm is from an SNMPv1 system this
object is a zero length string."
::= { alarmActiveEntry 4 }
alarmActiveEngineAddressType OBJECT-TYPE
SYNTAX InetAddressType
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This object indicates what type of address is stored in
the alarmActiveEngineAddress object - IPv4, IPv6, DNS, etc."
::= { alarmActiveEntry 5 }
alarmActiveEngineAddress OBJECT-TYPE
SYNTAX InetAddress
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The address of the SNMP engine on which the alarm is
occurring.
This object MUST always be instantiated, even if the list
can contain alarms from only one engine."
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::= { alarmActiveEntry 6 }
alarmActiveContextName OBJECT-TYPE
SYNTAX SnmpAdminString (SIZE(0..32))
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The name of the SNMP MIB context from which the alarm came.
For SNMPv1 alarms this is the community string from the Trap.
Note that care MUST be taken when selecting community
strings to ensure that these can be represented as a
well-formed SnmpAdminString. Community or Context names
that are not well-formed SnmpAdminStrings will be mapped
to zero length strings.
If the alarm's source SNMP engine is known not to support
multiple contexts, this object is a zero length string."
::= { alarmActiveEntry 7 }
alarmActiveVariables OBJECT-TYPE
SYNTAX Unsigned32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of variables in alarmActiveVariableTable for this
alarm."
::= { alarmActiveEntry 8 }
alarmActiveNotificationID OBJECT-TYPE
SYNTAX OBJECT IDENTIFIER
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The NOTIFICATION-TYPE object identifier of the alarm
state transition that is occurring."
::= { alarmActiveEntry 9 }
alarmActiveResourceId OBJECT-TYPE
SYNTAX ResourceId
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This object identifies the resource under alarm.
If there is no corresponding resource, then
the value of this object MUST be 0.0."
::= { alarmActiveEntry 10 }
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alarmActiveDescription OBJECT-TYPE
SYNTAX SnmpAdminString
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This object provides a textual description of the
active alarm. This text is generated dynamically by the
notification generator to provide useful information
to the human operator. This information SHOULD
provide information allowing the operator to locate
the resource for which this alarm is being generated.
This information is not intended for consumption by
automated tools."
::= { alarmActiveEntry 11 }
alarmActiveLogPointer OBJECT-TYPE
SYNTAX RowPointer
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"A pointer to the corresponding row in a
notification logging MIB where the state change
notification for this active alarm is logged.
If no log entry applies to this active alarm,
then this object MUST have the value of 0.0"
::= { alarmActiveEntry 12 }
alarmActiveModelPointer OBJECT-TYPE
SYNTAX RowPointer
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"A pointer to the corresponding row in the
alarmModelTable for this active alarm. This
points not only to the alarm model being
instantiated, but also to the specific alarm
state that is active."
::= { alarmActiveEntry 13 }
alarmActiveSpecificPointer OBJECT-TYPE
SYNTAX RowPointer
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"If no additional, model-specific, Alarm MIB is supported by
the system this object is `0.0'. When a model-specific Alarm
MIB is supported, this object is the instance pointer to the
specific model-specific active alarm list."
Chisholm & Romascanu Standards Track [Page 26]
RFC 3877 Alarm MIB September 2004
::= { alarmActiveEntry 14 }
-- Active Alarm Variable Table --
alarmActiveVariableTable OBJECT-TYPE
SYNTAX SEQUENCE OF AlarmActiveVariableEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A table of variables to go with active alarm entries."
::= { alarmActive 3 }
alarmActiveVariableEntry OBJECT-TYPE
SYNTAX AlarmActiveVariableEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Entries appear in this table when there are variables in
the varbind list of a corresponding alarm in
alarmActiveTable.
Entries appear in this table as though
the trap/notification had been transported using a
SNMPv2-Trap-PDU, as defined in [RFC3416] - i.e., the
alarmActiveVariableIndex 1 will always be sysUpTime
and alarmActiveVariableIndex 2 will always be
snmpTrapOID.
If the incoming notification is instead an SNMPv1 Trap-PDU and
the value of alarmModelVarbindIndex is 1 or 2, an appropriate
value for sysUpTime.0 or snmpTrapOID.0 shall be determined
by using the rules in section 3.1 of [RFC3584]."
INDEX { alarmListName, alarmActiveIndex,
alarmActiveVariableIndex }
::= { alarmActiveVariableTable 1 }
AlarmActiveVariableEntry ::= SEQUENCE {
alarmActiveVariableIndex Unsigned32,
alarmActiveVariableID OBJECT IDENTIFIER,
alarmActiveVariableValueType INTEGER,
alarmActiveVariableCounter32Val Counter32,
alarmActiveVariableUnsigned32Val Unsigned32,
alarmActiveVariableTimeTicksVal TimeTicks,
alarmActiveVariableInteger32Val Integer32,
alarmActiveVariableOctetStringVal OCTET STRING,
alarmActiveVariableIpAddressVal IpAddress,
alarmActiveVariableOidVal OBJECT IDENTIFIER,
alarmActiveVariableCounter64Val Counter64,
Chisholm & Romascanu Standards Track [Page 27]
RFC 3877 Alarm MIB September 2004
alarmActiveVariableOpaqueVal Opaque }
alarmActiveVariableIndex OBJECT-TYPE
SYNTAX Unsigned32 (1..4294967295)
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A strictly monotonically increasing integer, starting at
1 for a given alarmActiveIndex, for indexing variables
within the active alarm variable list. "
::= { alarmActiveVariableEntry 1 }
alarmActiveVariableID OBJECT-TYPE
SYNTAX OBJECT IDENTIFIER
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The alarm variable's object identifier."
::= { alarmActiveVariableEntry 2 }
alarmActiveVariableValueType OBJECT-TYPE
SYNTAX INTEGER {
counter32(1),
unsigned32(2),
timeTicks(3),
integer32(4),
ipAddress(5),
octetString(6),
objectId(7),
counter64(8),
opaque(9)
}
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The type of the value. One and only one of the value
objects that follow is used for a given row in this table,
based on this type."
::= { alarmActiveVariableEntry 3 }
alarmActiveVariableCounter32Val OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The value when alarmActiveVariableType is 'counter32'."
::= { alarmActiveVariableEntry 4 }
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alarmActiveVariableUnsigned32Val OBJECT-TYPE
SYNTAX Unsigned32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The value when alarmActiveVariableType is 'unsigned32'."
::= { alarmActiveVariableEntry 5 }
alarmActiveVariableTimeTicksVal OBJECT-TYPE
SYNTAX TimeTicks
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The value when alarmActiveVariableType is 'timeTicks'."
::= { alarmActiveVariableEntry 6 }
alarmActiveVariableInteger32Val OBJECT-TYPE
SYNTAX Integer32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The value when alarmActiveVariableType is 'integer32'."
::= { alarmActiveVariableEntry 7 }
alarmActiveVariableOctetStringVal OBJECT-TYPE
SYNTAX OCTET STRING (SIZE(0..65535))
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The value when alarmActiveVariableType is 'octetString'."
::= { alarmActiveVariableEntry 8 }
alarmActiveVariableIpAddressVal OBJECT-TYPE
SYNTAX IpAddress
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The value when alarmActiveVariableType is 'ipAddress'."
::= { alarmActiveVariableEntry 9 }
alarmActiveVariableOidVal OBJECT-TYPE
SYNTAX OBJECT IDENTIFIER
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The value when alarmActiveVariableType is 'objectId'."
::= { alarmActiveVariableEntry 10 }
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alarmActiveVariableCounter64Val OBJECT-TYPE
SYNTAX Counter64
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The value when alarmActiveVariableType is 'counter64'."
::= { alarmActiveVariableEntry 11 }
alarmActiveVariableOpaqueVal OBJECT-TYPE
SYNTAX Opaque (SIZE(0..65535))
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The value when alarmActiveVariableType is 'opaque'.
Note that although RFC2578 [RFC2578] forbids the use
of Opaque in 'standard' MIB modules, this particular
usage is driven by the need to be able to accurately
represent any well-formed notification, and justified
by the need for backward compatibility."
::= { alarmActiveVariableEntry 12 }
-- Statistics --
alarmActiveStatsTable OBJECT-TYPE
SYNTAX SEQUENCE OF AlarmActiveStatsEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This table represents the alarm statistics
information."
::= { alarmActive 4 }
alarmActiveStatsEntry OBJECT-TYPE
SYNTAX AlarmActiveStatsEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Statistics on the current active alarms."
INDEX { alarmListName }
::= { alarmActiveStatsTable 1 }
AlarmActiveStatsEntry ::=
SEQUENCE {
alarmActiveStatsActiveCurrent Gauge32,
alarmActiveStatsActives ZeroBasedCounter32,
alarmActiveStatsLastRaise TimeTicks,
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alarmActiveStatsLastClear TimeTicks
}
alarmActiveStatsActiveCurrent OBJECT-TYPE
SYNTAX Gauge32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The total number of currently active alarms on the system."
::= { alarmActiveStatsEntry 1 }
alarmActiveStatsActives OBJECT-TYPE
SYNTAX ZeroBasedCounter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The total number of active alarms since system restarted."
::= { alarmActiveStatsEntry 2 }
alarmActiveStatsLastRaise OBJECT-TYPE
SYNTAX TimeTicks
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The value of sysUpTime at the time of the last
alarm raise for this alarm list.
If no alarm raises have occurred since the
last re-initialization of the local network management
subsystem, then this object contains a zero value."
::= { alarmActiveStatsEntry 3 }
alarmActiveStatsLastClear OBJECT-TYPE
SYNTAX TimeTicks
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The value of sysUpTime at the time of the last
alarm clear for this alarm list.
If no alarm clears have occurred since the
last re-initialization of the local network management
subsystem, then this object contains a zero value."
::= { alarmActiveStatsEntry 4 }
-- Alarm Clear
alarmClearMaximum OBJECT-TYPE
SYNTAX Unsigned32
MAX-ACCESS read-write
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STATUS current
DESCRIPTION
"This object specifies the maximum number of cleared
alarms to store in the alarmClearTable. When this
number is reached, the cleared alarms with the
earliest clear time will be removed from the table."
::= { alarmClear 1 }
alarmClearTable OBJECT-TYPE
SYNTAX SEQUENCE OF AlarmClearEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This table contains information on
cleared alarms."
::= { alarmClear 2 }
alarmClearEntry OBJECT-TYPE
SYNTAX AlarmClearEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Information on a cleared alarm."
INDEX { alarmListName, alarmClearDateAndTime,
alarmClearIndex }
::= { alarmClearTable 1 }
AlarmClearEntry ::=
SEQUENCE {
alarmClearIndex Unsigned32,
alarmClearDateAndTime DateAndTime,
alarmClearEngineID LocalSnmpEngineOrZeroLenStr,
alarmClearEngineAddressType InetAddressType,
alarmClearEngineAddress InetAddress,
alarmClearContextName SnmpAdminString,
alarmClearNotificationID OBJECT IDENTIFIER,
alarmClearResourceId ResourceId,
alarmClearLogIndex Unsigned32,
alarmClearModelPointer RowPointer
}
alarmClearIndex OBJECT-TYPE
SYNTAX Unsigned32 (1..4294967295)
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An integer which acts as the index of entries within
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RFC 3877 Alarm MIB September 2004
the named alarm list. It wraps back to 1 after it
reaches its maximum value.
This object has the same value as the alarmActiveIndex that
this alarm instance had when it was active."
::= { alarmClearEntry 1 }
alarmClearDateAndTime OBJECT-TYPE
SYNTAX DateAndTime
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The local date and time when the alarm cleared.
This object facilitates retrieving all instances of
alarms that have been cleared since a given point in time.
Implementations MUST include the offset from UTC,
if available. Implementation in environments in which
the UTC offset is not available is NOT RECOMMENDED."
::= { alarmClearEntry 2 }
alarmClearEngineID OBJECT-TYPE
SYNTAX LocalSnmpEngineOrZeroLenStr
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The identification of the SNMP engine at which the alarm
originated. If the alarm is from an SNMPv1 system this
object is a zero length string."
::= { alarmClearEntry 3 }
alarmClearEngineAddressType OBJECT-TYPE
SYNTAX InetAddressType
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This object indicates what type of address is stored in
the alarmActiveEngineAddress object - IPv4, IPv6, DNS, etc."
::= { alarmClearEntry 4 }
alarmClearEngineAddress OBJECT-TYPE
SYNTAX InetAddress
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The Address of the SNMP engine on which the alarm was
occurring. This is used to identify the source of an SNMPv1
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RFC 3877 Alarm MIB September 2004
trap, since an alarmActiveEngineId cannot be extracted from the
SNMPv1 trap PDU.
This object MUST always be instantiated, even if the list
can contain alarms from only one engine."
::= { alarmClearEntry 5 }
alarmClearContextName OBJECT-TYPE
SYNTAX SnmpAdminString (SIZE(0..32))
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The name of the SNMP MIB context from which the alarm came.
For SNMPv1 traps this is the community string from the Trap.
Note that care needs to be taken when selecting community
strings to ensure that these can be represented as a
well-formed SnmpAdminString. Community or Context names
that are not well-formed SnmpAdminStrings will be mapped
to zero length strings.
If the alarm's source SNMP engine is known not to support
multiple contexts, this object is a zero length string."
::= { alarmClearEntry 6 }
alarmClearNotificationID OBJECT-TYPE
SYNTAX OBJECT IDENTIFIER
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The NOTIFICATION-TYPE object identifier of the alarm
clear."
::= { alarmClearEntry 7 }
alarmClearResourceId OBJECT-TYPE
SYNTAX ResourceId
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This object identifies the resource that was under alarm.
If there is no corresponding resource, then
the value of this object MUST be 0.0."
::= { alarmClearEntry 8 }
alarmClearLogIndex OBJECT-TYPE
SYNTAX Unsigned32 (0..4294967295)
MAX-ACCESS read-only
STATUS current
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DESCRIPTION
"This number MUST be the same as the log index of the
applicable row in the notification log MIB, if it exists.
If no log index applies to the trap, then this object
MUST have the value of 0."
::= { alarmClearEntry 9 }
alarmClearModelPointer OBJECT-TYPE
SYNTAX RowPointer
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"A pointer to the corresponding row in the
alarmModelTable for this cleared alarm."
::= { alarmClearEntry 10 }
-- Notifications
alarmActiveState NOTIFICATION-TYPE
OBJECTS { alarmActiveModelPointer,
alarmActiveResourceId }
STATUS current
DESCRIPTION
"An instance of the alarm indicated by
alarmActiveModelPointer has been raised
against the entity indicated by
alarmActiveResourceId.
The agent must throttle the generation of
consecutive alarmActiveState traps so that there is at
least a two-second gap between traps of this
type against the same alarmActiveModelPointer and
alarmActiveResourceId. When traps are throttled,
they are dropped, not queued for sending at a future time.
A management application should periodically check
the value of alarmActiveLastChanged to detect any
missed alarmActiveState notification-events, e.g.,
due to throttling or transmission loss."
::= { alarmNotifications 2 }
alarmClearState NOTIFICATION-TYPE
OBJECTS { alarmActiveModelPointer,
alarmActiveResourceId }
STATUS current
DESCRIPTION
"An instance of the alarm indicated by
alarmActiveModelPointer has been cleared against
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RFC 3877 Alarm MIB September 2004
the entity indicated by alarmActiveResourceId.
The agent must throttle the generation of
consecutive alarmActiveClear traps so that there is at
least a two-second gap between traps of this
type against the same alarmActiveModelPointer and
alarmActiveResourceId. When traps are throttled,
they are dropped, not queued for sending at a future time.
A management application should periodically check
the value of alarmActiveLastChanged to detect any
missed alarmClearState notification-events, e.g.,
due to throttling or transmission loss."
::= { alarmNotifications 3 }
-- Conformance
alarmConformance OBJECT IDENTIFIER ::= { alarmMIB 2 }
alarmCompliances OBJECT IDENTIFIER ::= { alarmConformance 1 }
alarmCompliance MODULE-COMPLIANCE
STATUS current
DESCRIPTION
"The compliance statement for systems supporting
the Alarm MIB."
MODULE -- this module
MANDATORY-GROUPS {
alarmActiveGroup,
alarmModelGroup
}
GROUP alarmActiveStatsGroup
DESCRIPTION
"This group is optional."
GROUP alarmClearGroup
DESCRIPTION
"This group is optional."
GROUP alarmNotificationsGroup
DESCRIPTION
"This group is optional."
::= { alarmCompliances 1 }
alarmGroups OBJECT IDENTIFIER ::= { alarmConformance 2 }
alarmModelGroup OBJECT-GROUP
OBJECTS {
alarmModelLastChanged,
alarmModelNotificationId,
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alarmModelVarbindIndex,
alarmModelVarbindValue,
alarmModelDescription,
alarmModelSpecificPointer,
alarmModelVarbindSubtree,
alarmModelResourcePrefix,
alarmModelRowStatus
}
STATUS current
DESCRIPTION
"Alarm model group."
::= { alarmGroups 1}
alarmActiveGroup OBJECT-GROUP
OBJECTS {
alarmActiveLastChanged,
alarmActiveOverflow,
alarmActiveEngineID,
alarmActiveEngineAddressType,
alarmActiveEngineAddress,
alarmActiveContextName,
alarmActiveVariables,
alarmActiveNotificationID,
alarmActiveResourceId,
alarmActiveDescription,
alarmActiveLogPointer,
alarmActiveModelPointer,
alarmActiveSpecificPointer,
alarmActiveVariableID,
alarmActiveVariableValueType,
alarmActiveVariableCounter32Val,
alarmActiveVariableUnsigned32Val,
alarmActiveVariableTimeTicksVal,
alarmActiveVariableInteger32Val,
alarmActiveVariableOctetStringVal,
alarmActiveVariableIpAddressVal,
alarmActiveVariableOidVal,
alarmActiveVariableCounter64Val,
alarmActiveVariableOpaqueVal
}
STATUS current
DESCRIPTION
"Active Alarm list group."
::= { alarmGroups 2}
alarmActiveStatsGroup OBJECT-GROUP
OBJECTS {
alarmActiveStatsActives,
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RFC 3877 Alarm MIB September 2004
alarmActiveStatsActiveCurrent,
alarmActiveStatsLastRaise,
alarmActiveStatsLastClear
}
STATUS current
DESCRIPTION
"Active alarm summary group."
::= { alarmGroups 3}
alarmClearGroup OBJECT-GROUP
OBJECTS {
alarmClearMaximum,
alarmClearEngineID,
alarmClearEngineAddressType,
alarmClearEngineAddress,
alarmClearContextName,
alarmClearNotificationID,
alarmClearResourceId,
alarmClearLogIndex,
alarmClearModelPointer
}
STATUS current
DESCRIPTION
"Cleared alarm group."
::= { alarmGroups 4}
alarmNotificationsGroup NOTIFICATION-GROUP
NOTIFICATIONS { alarmActiveState, alarmClearState }
STATUS current
DESCRIPTION
"The collection of notifications that can be used to
model alarms for faults lacking pre-existing
notification definitions."
::= { alarmGroups 6 }
END
5. ITU Alarm
5.1. Overview
This MIB module defines alarm information specific to the alarm model
defined in ITU M.3100 [M.3100], X.733 [X.733], and X.736 [X.736].
This MIB module follows the modular architecture defined by the Alarm
MIB, in which the generic Alarm MIB can be augmented by other alarm
information defined according to more specific models that define
additional behaviour and characteristics.
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RFC 3877 Alarm MIB September 2004
The ituAlarmTable contains information from the ITU Alarm Model about
possible alarms in the system.
The ituAlarmActiveTable contains information from the ITU Alarm Model
about alarms modelled using the ituAlarmTable that are currently
occurring on the system.
The ituAlarmActiveStatsTable provides statistics on current and total
alarms.
5.2. IANA Considerations
Over time, there will be a need to add new IANAITUEventType and
IANAItuProbableCause enumerated values. The Internet Assigned Number
Authority (IANA) is responsible for the assignment of the
enumerations in these TCs.
IANAItuProbableCause value of 0 is reserved for special purposes and
MUST NOT be assigned. Values of IANAItuProbableCause in the range 1
to 1023 are reserved for causes that correspond to ITU-T probable
cause. All other requests for new causes will be handled on a
first-come basis, with 1025.
Request should come in the form of well-formed SMI [RFC2578] for
enumeration names that are unique and sufficiently descriptive.
While some effort will be taken to ensure that new enumerations do
not conceptually duplicate existing enumerations it is acknowledged
that the existence of conceptual duplicates in the starting probable
cause list is an known industry reality.
To aid IANA in the administration of probable cause names and values,
the OPS Area Director will appoint one or more experts to help review
requests.
See http://www.iana.org
The following shall be used as the initial values, but the latest
values for these textual conventions should be obtained from IANA:
IANA-ITU-ALARM-TC-MIB DEFINITIONS ::= BEGIN
IMPORTS
MODULE-IDENTITY, mib-2
FROM SNMPv2-SMI -- [RFC2578]
TEXTUAL-CONVENTION
FROM SNMPv2-TC; -- [RFC2579]
Chisholm & Romascanu Standards Track [Page 39]
RFC 3877 Alarm MIB September 2004
ianaItuAlarmNumbers MODULE-IDENTITY
LAST-UPDATED "200409090000Z" -- September 09, 2004
ORGANIZATION "IANA"
CONTACT-INFO
"Postal: Internet Assigned Numbers Authority
Internet Corporation for Assigned Names
and Numbers
4676 Admiralty Way, Suite 330
Marina del Rey, CA 90292-6601
USA
Tel: +1 310-823-9358
E-Mail: iana@iana.org"
DESCRIPTION
"The MIB module defines the ITU Alarm
textual convention for objects expected to require
regular extension.
Copyright (C) The Internet Society (2004). The
initial version of this MIB module was published
in RFC 3877. For full legal notices see the RFC
itself. Supplementary information may be available on:
http://www.ietf.org/copyrights/ianamib.html"
REVISION "200409090000Z" -- September 09, 2004
DESCRIPTION
"Initial version, published as RFC 3877."
::= { mib-2 119 }
IANAItuProbableCause ::= TEXTUAL-CONVENTION
STATUS current
DESCRIPTION
"ITU-T probable cause values. Duplicate values defined in
X.733 are appended with X733 to ensure syntactic uniqueness.
Probable cause value 0 is reserved for special purposes.
The Internet Assigned Number Authority (IANA) is responsible
for the assignment of the enumerations in this TC.
IANAItuProbableCause value of 0 is reserved for special
purposes and MUST NOT be assigned.
Values of IANAItuProbableCause in the range 1 to 1023 are
reserved for causes that correspond to ITU-T probable cause.
All other requests for new causes will be handled on a
first-come, first served basis and will be assigned
enumeration values starting with 1025.
Request should come in the form of well-formed
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RFC 3877 Alarm MIB September 2004
SMI [RFC2578] for enumeration names that are unique and
sufficiently descriptive.
While some effort will be taken to ensure that new probable
causes do not conceptually duplicate existing probable
causes it is acknowledged that the existence of conceptual
duplicates in the starting probable cause list is an known
industry reality.
To aid IANA in the administration of probable cause names
and values, the OPS Area Director will appoint one or more
experts to help review requests.
See http://www.iana.org"
REFERENCE
"ITU Recommendation M.3100, 'Generic Network Information
Model', 1995
ITU Recommendation X.733, 'Information Technology - Open
Systems Interconnection - System Management: Alarm
Reporting Function', 1992
ITU Recommendation X.736, 'Information Technology - Open
Systems Interconnection - System Management: Security
Alarm Reporting Function', 1992"
SYNTAX INTEGER
{
-- The following probable causes were defined in M.3100
aIS (1),
callSetUpFailure (2),
degradedSignal (3),
farEndReceiverFailure (4),
framingError (5),
lossOfFrame (6),
lossOfPointer (7),
lossOfSignal (8),
payloadTypeMismatch (9),
transmissionError (10),
remoteAlarmInterface (11),
excessiveBER (12),
pathTraceMismatch (13),
unavailable (14),
signalLabelMismatch (15),
lossOfMultiFrame (16),
receiveFailure (17),
transmitFailure (18),
modulationFailure (19),
demodulationFailure (20),
broadcastChannelFailure (21),
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RFC 3877 Alarm MIB September 2004
connectionEstablishmentError (22),
invalidMessageReceived (23),
localNodeTransmissionError (24),
remoteNodeTransmissionError (25),
routingFailure (26),
--Values 27-50 are reserved for communications alarm related
--probable causes
-- The following are used with equipment alarm.
backplaneFailure (51),
dataSetProblem (52),
equipmentIdentifierDuplication (53),
externalIFDeviceProblem (54),
lineCardProblem (55),
multiplexerProblem (56),
nEIdentifierDuplication (57),
powerProblem (58),
processorProblem (59),
protectionPathFailure (60),
receiverFailure (61),
replaceableUnitMissing (62),
replaceableUnitTypeMismatch (63),
synchronizationSourceMismatch (64),
terminalProblem (65),
timingProblem (66),
transmitterFailure (67),
trunkCardProblem (68),
replaceableUnitProblem (69),
realTimeClockFailure (70),
--An equipment alarm to be issued if the system detects that the
--real time clock has failed
antennaFailure (71),
batteryChargingFailure (72),
diskFailure (73),
frequencyHoppingFailure (74),
iODeviceError (75),
lossOfSynchronisation (76),
lossOfRedundancy (77),
powerSupplyFailure (78),
signalQualityEvaluationFailure (79),
tranceiverFailure (80),
protectionMechanismFailure (81),
protectingResourceFailure (82),
-- Values 83-100 are reserved for equipment alarm related probable
-- causes
-- The following are used with environmental alarm.
airCompressorFailure (101),
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RFC 3877 Alarm MIB September 2004
airConditioningFailure (102),
airDryerFailure (103),
batteryDischarging (104),
batteryFailure (105),
commercialPowerFailure (106),
coolingFanFailure (107),
engineFailure (108),
fireDetectorFailure (109),
fuseFailure (110),
generatorFailure (111),
lowBatteryThreshold (112),
pumpFailure (113),
rectifierFailure (114),
rectifierHighVoltage (115),
rectifierLowFVoltage (116),
ventilationsSystemFailure (117),
enclosureDoorOpen (118),
explosiveGas (119),
fire (120),
flood (121),
highHumidity (122),
highTemperature (123),
highWind (124),
iceBuildUp (125),
intrusionDetection (126),
lowFuel (127),
lowHumidity (128),
lowCablePressure (129),
lowTemperatue (130),
lowWater (131),
smoke (132),
toxicGas (133),
coolingSystemFailure (134),
externalEquipmentFailure (135),
externalPointFailure (136),
-- Values 137-150 are reserved for environmental alarm related
-- probable causes
-- The following are used with Processing error alarm.
storageCapacityProblem (151),
memoryMismatch (152),
corruptData (153),
outOfCPUCycles (154),
sfwrEnvironmentProblem (155),
sfwrDownloadFailure (156),
lossOfRealTimel (157),
--A processing error alarm to be issued after the system has
--reinitialised. This will indicate
--to the management systems that the view they have of the managed
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RFC 3877 Alarm MIB September 2004
--system may no longer
--be valid. Usage example: The managed
--system issues this alarm after a reinitialization with severity
--warning to inform the
--management system about the event. No clearing notification will
--be sent.
applicationSubsystemFailure (158),
configurationOrCustomisationError (159),
databaseInconsistency (160),
fileError (161),
outOfMemory (162),
softwareError (163),
timeoutExpired (164),
underlayingResourceUnavailable (165),
versionMismatch (166),
--Values 168-200 are reserved for processing error alarm related
-- probable causes.
bandwidthReduced (201),
congestion (202),
excessiveErrorRate (203),
excessiveResponseTime (204),
excessiveRetransmissionRate (205),
reducedLoggingCapability (206),
systemResourcesOverload (207 ),
-- The following were defined X.733
adapterError (500),
applicationSubsystemFailture (501),
bandwidthReducedX733 (502),
callEstablishmentError (503),
communicationsProtocolError (504),
communicationsSubsystemFailure (505),
configurationOrCustomizationError (506),
congestionX733 (507),
coruptData (508),
cpuCyclesLimitExceeded (509),
dataSetOrModemError (510),
degradedSignalX733 (511),
dteDceInterfaceError (512),
enclosureDoorOpenX733 (513),
equipmentMalfunction (514),
excessiveVibration (515),
fileErrorX733 (516),
fireDetected (517),
framingErrorX733 (518),
heatingVentCoolingSystemProblem (519),
humidityUnacceptable (520),
inputOutputDeviceError (521),
inputDeviceError (522),
Chisholm & Romascanu Standards Track [Page 44]
RFC 3877 Alarm MIB September 2004
lanError (523),
leakDetected (524),
localNodeTransmissionErrorX733 (525),
lossOfFrameX733 (526),
lossOfSignalX733 (527),
materialSupplyExhausted (528),
multiplexerProblemX733 (529),
outOfMemoryX733 (530),
ouputDeviceError (531),
performanceDegraded (532),
powerProblems (533),
pressureUnacceptable (534),
processorProblems (535),
pumpFailureX733 (536),
queueSizeExceeded (537),
receiveFailureX733 (538),
receiverFailureX733 (539),
remoteNodeTransmissionErrorX733 (540),
resourceAtOrNearingCapacity (541),
responseTimeExecessive (542),
retransmissionRateExcessive (543),
softwareErrorX733 (544),
softwareProgramAbnormallyTerminated (545),
softwareProgramError (546),
storageCapacityProblemX733 (547),
temperatureUnacceptable (548),
thresholdCrossed (549),
timingProblemX733 (550),
toxicLeakDetected (551),
transmitFailureX733 (552),
transmiterFailure (553),
underlyingResourceUnavailable (554),
versionMismatchX733 (555),
-- The following are defined in X.736
authenticationFailure (600),
breachOfConfidentiality (601),
cableTamper (602),
delayedInformation (603),
denialOfService (604),
duplicateInformation (605),
informationMissing (606),
informationModificationDetected (607),
informationOutOfSequence (608),
keyExpired (609),
nonRepudiationFailure (610),
outOfHoursActivity (611),
outOfService (612),
proceduralError (613),
Chisholm & Romascanu Standards Track [Page 45]
RFC 3877 Alarm MIB September 2004
unauthorizedAccessAttempt (614),
unexpectedInformation (615),
other (1024)
}
IANAItuEventType ::= TEXTUAL-CONVENTION
STATUS current
DESCRIPTION
"The ITU event Type values.
The Internet Assigned Number Authority (IANA) is
responsible for the assignment of the enumerations
in this TC.
Request should come in the form of well-formed
SMI [RFC2578] for enumeration names that are unique
and sufficiently descriptive.
See http://www.iana.org "
REFERENCE
"ITU Recommendation X.736, 'Information Technology - Open
Systems Interconnection - System Management: Security
Alarm Reporting Function', 1992"
SYNTAX INTEGER
{
other (1),
communicationsAlarm (2),
qualityOfServiceAlarm (3),
processingErrorAlarm (4),
equipmentAlarm (5),
environmentalAlarm (6),
integrityViolation (7),
operationalViolation (8),
physicalViolation (9),
securityServiceOrMechanismViolation (10),
timeDomainViolation (11)
}
END
Chisholm & Romascanu Standards Track [Page 46]
RFC 3877 Alarm MIB September 2004
5.3. Textual Conventions
ITU-ALARM-TC-MIB DEFINITIONS ::= BEGIN
IMPORTS
MODULE-IDENTITY, mib-2
FROM SNMPv2-SMI -- [RFC2578]
TEXTUAL-CONVENTION
FROM SNMPv2-TC; -- [RFC2579]
ituAlarmTc MODULE-IDENTITY
LAST-UPDATED "200409090000Z" -- September 09, 2004
ORGANIZATION "IETF Distributed Management Working Group"
CONTACT-INFO
" WG EMail: disman@ietf.org
Subscribe: disman-request@ietf.org
http://www.ietf.org/html.charters/disman-charter.html
Chair: Randy Presuhn
randy_presuhn@mindspring.com
Editors: Sharon Chisholm
Nortel Networks
PO Box 3511 Station C
Ottawa, Ont. K1Y 4H7
Canada
schishol@nortelnetworks.com
Dan Romascanu
Avaya
Atidim Technology Park, Bldg. #3
Tel Aviv, 61131
Israel
Tel: +972-3-645-8414
Email: dromasca@avaya.com"
DESCRIPTION
"This MIB module defines the ITU Alarm
textual convention for objects not expected to require
regular extension.
Copyright (C) The Internet Society (2004). The
initial version of this MIB module was published
in RFC 3877. For full legal notices see the RFC
itself. Supplementary information may be available on:
http://www.ietf.org/copyrights/ianamib.html"
REVISION "200409090000Z" -- September 09, 2004
DESCRIPTION
"Initial version, published as RFC 3877."
Chisholm & Romascanu Standards Track [Page 47]
RFC 3877 Alarm MIB September 2004
::= { mib-2 120 }
ItuPerceivedSeverity ::= TEXTUAL-CONVENTION
STATUS current
DESCRIPTION
"ITU perceived severity values"
REFERENCE
"ITU Recommendation M.3100, 'Generic Network Information
Model', 1995
ITU Recommendation X.733, 'Information Technology - Open
Systems Interconnection - System Management: Alarm
Reporting Function', 1992"
SYNTAX INTEGER
{
cleared (1),
indeterminate (2),
critical (3),
major (4),
minor (5),
warning (6)
}
ItuTrendIndication ::= TEXTUAL-CONVENTION
STATUS current
DESCRIPTION
"ITU trend indication values for alarms."
REFERENCE
"ITU Recommendation M.3100, 'Generic Network Information
Model', 1995
ITU Recommendation X.733, 'Information Technology - Open
Systems Interconnection - System Management: Alarm
Reporting Function', 1992"
SYNTAX INTEGER
{
moreSevere (1),
noChange (2),
lessSevere (3)
}
END
Chisholm & Romascanu Standards Track [Page 48]
RFC 3877 Alarm MIB September 2004
5.4. Definitions
ITU-ALARM-MIB DEFINITIONS ::= BEGIN
IMPORTS
MODULE-IDENTITY, OBJECT-TYPE,
Gauge32, mib-2
FROM SNMPv2-SMI -- [RFC2578]
AutonomousType, RowPointer
FROM SNMPv2-TC -- [RFC2579]
SnmpAdminString
FROM SNMP-FRAMEWORK-MIB -- [RFC3411]
alarmListName, alarmModelIndex,
alarmActiveDateAndTime, alarmActiveIndex
FROM ALARM-MIB -- [RFC3877]
ItuPerceivedSeverity,
ItuTrendIndication
FROM ITU-ALARM-TC-MIB -- [RFC3877]
IANAItuProbableCause,
IANAItuEventType
FROM IANA-ITU-ALARM-TC-MIB -- [RFC3877]
MODULE-COMPLIANCE, OBJECT-GROUP
FROM SNMPv2-CONF -- [RFC2580]
ZeroBasedCounter32
FROM RMON2-MIB; -- [RFC2021]
ituAlarmMIB MODULE-IDENTITY
LAST-UPDATED "200409090000Z" -- September 09, 2004
ORGANIZATION "IETF Distributed Management Working Group"
CONTACT-INFO
"WG EMail: disman@ietf.org
Subscribe: disman-request@ietf.org
http://www.ietf.org/html.charters/disman-charter.html
Chair: Randy Presuhn
randy_presuhn@mindspring.com
Editors: Sharon Chisholm
Nortel Networks
PO Box 3511 Station C
Ottawa, Ont. K1Y 4H7
Canada
schishol@nortelnetworks.com
Dan Romascanu
Avaya
Atidim Technology Park, Bldg. #3
Tel Aviv, 61131
Chisholm & Romascanu Standards Track [Page 49]
RFC 3877 Alarm MIB September 2004
Israel
Tel: +972-3-645-8414
Email: dromasca@avaya.com"
DESCRIPTION
"The MIB module describes ITU Alarm information
as defined in ITU Recommendation M.3100 [M.3100],
X.733 [X.733] and X.736 [X.736].
Copyright (C) The Internet Society (2004). The
initial version of this MIB module was published
in RFC 3877. For full legal notices see the RFC
itself. Supplementary information may be available on:
http://www.ietf.org/copyrights/ianamib.html"
REVISION "200409090000Z" -- September 09, 2004
DESCRIPTION
"Initial version, published as RFC 3877."
::= { mib-2 121 }
ituAlarmObjects OBJECT IDENTIFIER ::= { ituAlarmMIB 1 }
ituAlarmModel OBJECT IDENTIFIER ::= { ituAlarmObjects 1 }
ituAlarmActive OBJECT IDENTIFIER ::= { ituAlarmObjects 2 }
ituAlarmTable OBJECT-TYPE
SYNTAX SEQUENCE OF ItuAlarmEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A table of ITU Alarm information for possible alarms
on the system."
::= { ituAlarmModel 1 }
ituAlarmEntry OBJECT-TYPE
SYNTAX ItuAlarmEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Entries appear in this table whenever an entry is created
in the alarmModelTable with a value of alarmModelState in
the range from 1 to 6. Entries disappear from this table
whenever the corresponding entries are deleted from the
alarmModelTable, including in cases where those entries
have been deleted due to local system action. The value of
alarmModelSpecificPointer has no effect on the creation
or deletion of entries in this table. Values of
alarmModelState map to values of ituAlarmPerceivedSeverity
as follows:
Chisholm & Romascanu Standards Track [Page 50]
RFC 3877 Alarm MIB September 2004
alarmModelState -> ituAlarmPerceivedSeverity
1 -> clear (1)
2 -> indeterminate (2)
3 -> warning (6)
4 -> minor (5)
5 -> major (4)
6 -> critical (3)
All other values of alarmModelState MUST NOT appear
in this table.
This table MUST be persistent across system reboots."
INDEX { alarmListName, alarmModelIndex,
ituAlarmPerceivedSeverity }
::= { ituAlarmTable 1 }
ItuAlarmEntry ::= SEQUENCE {
ituAlarmPerceivedSeverity ItuPerceivedSeverity,
ituAlarmEventType IANAItuEventType,
ituAlarmProbableCause IANAItuProbableCause,
ituAlarmAdditionalText SnmpAdminString,
ituAlarmGenericModel RowPointer }
ituAlarmPerceivedSeverity OBJECT-TYPE
SYNTAX ItuPerceivedSeverity
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"ITU perceived severity values."
REFERENCE
"ITU Recommendation M.3100, 'Generic Network Information
Model', 1995
ITU Recommendation X.733, 'Information Technology - Open
Systems Interconnection - System Management: Alarm
Reporting Function', 1992"
::= { ituAlarmEntry 1 }
ituAlarmEventType OBJECT-TYPE
SYNTAX IANAItuEventType
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"Represents the event type values for the alarms"
REFERENCE
"ITU Recommendation M.3100, 'Generic Network Information
Model', 1995
ITU Recommendation X.733, 'Information Technology - Open
Systems Interconnection - System Management: Alarm
Chisholm & Romascanu Standards Track [Page 51]
RFC 3877 Alarm MIB September 2004
Reporting Function', 1992
ITU Recommendation X.736, 'Information Technology - Open
Systems Interconnection - System Management: Security
Alarm Reporting Function', 1992"
::= { ituAlarmEntry 2 }
ituAlarmProbableCause OBJECT-TYPE
SYNTAX IANAItuProbableCause
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"ITU probable cause values."
REFERENCE
"ITU Recommendation M.3100, 'Generic Network Information
Model', 1995
ITU Recommendation X.733, 'Information Technology - Open
Systems Interconnection - System Management: Alarm
Reporting Function', 1992
ITU Recommendation X.736, 'Information Technology - Open
Systems Interconnection - System Management: Security
Alarm Reporting Function', 1992"
::= { ituAlarmEntry 3 }
ituAlarmAdditionalText OBJECT-TYPE
SYNTAX SnmpAdminString
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"Represents the additional text field for the alarm."
REFERENCE
"ITU Recommendation M.3100, 'Generic Network Information
Model', 1995
ITU Recommendation X.733, 'Information Technology - Open
Systems Interconnection - System Management: Alarm
Reporting Function', 1992"
::= { ituAlarmEntry 4}
ituAlarmGenericModel OBJECT-TYPE
SYNTAX RowPointer
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"This object points to the corresponding
row in the alarmModelTable for this alarm severity.
This corresponding entry to alarmModelTable could also
be derived by performing the reverse of the mapping
from alarmModelState to ituAlarmPerceivedSeverity defined
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in the description of ituAlarmEntry to determine the
appropriate { alarmListName, alarmModelIndex, alarmModelState }
for this { alarmListName, alarmModelIndex,
ituAlarmPerceivedSeverity }."
::= { ituAlarmEntry 5 }
-- ITU Active Alarm Table --
ituAlarmActiveTable OBJECT-TYPE
SYNTAX SEQUENCE OF ItuAlarmActiveEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A table of ITU information for active alarms entries."
::= { ituAlarmActive 1 }
ituAlarmActiveEntry OBJECT-TYPE
SYNTAX ItuAlarmActiveEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Entries appear in this table when alarms are active. They
are removed when the alarm is no longer occurring."
INDEX { alarmListName, alarmActiveDateAndTime,
alarmActiveIndex }
::= { ituAlarmActiveTable 1 }
ItuAlarmActiveEntry ::= SEQUENCE {
ituAlarmActiveTrendIndication ItuTrendIndication,
ituAlarmActiveDetector AutonomousType,
ituAlarmActiveServiceProvider AutonomousType,
ituAlarmActiveServiceUser AutonomousType
}
ituAlarmActiveTrendIndication OBJECT-TYPE
SYNTAX ItuTrendIndication
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Represents the trend indication values for the alarms."
REFERENCE
"ITU Recommendation M.3100, 'Generic Network Information
Model', 1995
ITU Recommendation X.733, 'Information Technology - Open
Systems Interconnection - System Management: Alarm
Reporting Function', 1992"
::= { ituAlarmActiveEntry 1 }
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ituAlarmActiveDetector OBJECT-TYPE
SYNTAX AutonomousType
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Represents the SecurityAlarmDetector object."
REFERENCE
"ITU Recommendation X.736, 'Information Technology - Open
Systems Interconnection - System Management: Security
Alarm Reporting Function', 1992"
::= { ituAlarmActiveEntry 2 }
ituAlarmActiveServiceProvider OBJECT-TYPE
SYNTAX AutonomousType
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Represents the ServiceProvider object."
REFERENCE
"ITU Recommendation X.736, 'Information Technology - Open
Systems Interconnection - System Management: Security
Alarm Reporting Function', 1992"
::= { ituAlarmActiveEntry 3 }
ituAlarmActiveServiceUser OBJECT-TYPE
SYNTAX AutonomousType
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Represents the ServiceUser object."
REFERENCE
"ITU Recommendation X.736, 'Information Technology - Open
Systems Interconnection - System Management: Security
Alarm Reporting Function', 1992"
::= { ituAlarmActiveEntry 4 }
-- Statistics and Counters
ituAlarmActiveStatsTable OBJECT-TYPE
SYNTAX SEQUENCE OF ItuAlarmActiveStatsEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This table represents the ITU alarm statistics
information."
::= { ituAlarmActive 2 }
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ituAlarmActiveStatsEntry OBJECT-TYPE
SYNTAX ItuAlarmActiveStatsEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Statistics on the current active ITU alarms."
INDEX { alarmListName }
::= { ituAlarmActiveStatsTable 1 }
ItuAlarmActiveStatsEntry ::=
SEQUENCE {
ituAlarmActiveStatsIndeterminateCurrent Gauge32,
ituAlarmActiveStatsCriticalCurrent Gauge32,
ituAlarmActiveStatsMajorCurrent Gauge32,
ituAlarmActiveStatsMinorCurrent Gauge32,
ituAlarmActiveStatsWarningCurrent Gauge32,
ituAlarmActiveStatsIndeterminates ZeroBasedCounter32,
ituAlarmActiveStatsCriticals ZeroBasedCounter32,
ituAlarmActiveStatsMajors ZeroBasedCounter32,
ituAlarmActiveStatsMinors ZeroBasedCounter32,
ituAlarmActiveStatsWarnings ZeroBasedCounter32
}
ituAlarmActiveStatsIndeterminateCurrent OBJECT-TYPE
SYNTAX Gauge32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"A count of the current number of active alarms with a
ituAlarmPerceivedSeverity of indeterminate."
::= { ituAlarmActiveStatsEntry 1 }
ituAlarmActiveStatsCriticalCurrent OBJECT-TYPE
SYNTAX Gauge32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"A count of the current number of active alarms with a
ituAlarmPerceivedSeverity of critical."
::= { ituAlarmActiveStatsEntry 2 }
ituAlarmActiveStatsMajorCurrent OBJECT-TYPE
SYNTAX Gauge32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"A count of the current number of active alarms with a
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ituAlarmPerceivedSeverity of major."
::= { ituAlarmActiveStatsEntry 3 }
ituAlarmActiveStatsMinorCurrent OBJECT-TYPE
SYNTAX Gauge32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"A count of the current number of active alarms with a
ituAlarmPerceivedSeverity of minor."
::= { ituAlarmActiveStatsEntry 4 }
ituAlarmActiveStatsWarningCurrent OBJECT-TYPE
SYNTAX Gauge32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"A count of the current number of active alarms with a
ituAlarmPerceivedSeverity of warning."
::= { ituAlarmActiveStatsEntry 5 }
ituAlarmActiveStatsIndeterminates OBJECT-TYPE
SYNTAX ZeroBasedCounter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"A count of the total number of active alarms with a
ituAlarmPerceivedSeverity of indeterminate since system
restart."
::= { ituAlarmActiveStatsEntry 6 }
ituAlarmActiveStatsCriticals OBJECT-TYPE
SYNTAX ZeroBasedCounter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"A count of the total number of active alarms with a
ituAlarmPerceivedSeverity of critical since system restart."
::= { ituAlarmActiveStatsEntry 7 }
ituAlarmActiveStatsMajors OBJECT-TYPE
SYNTAX ZeroBasedCounter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"A count of the total number of active alarms with a
ituAlarmPerceivedSeverity of major since system restart."
::= { ituAlarmActiveStatsEntry 8 }
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ituAlarmActiveStatsMinors OBJECT-TYPE
SYNTAX ZeroBasedCounter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"A count of the total number of active alarms with a
ituAlarmPerceivedSeverity of minor since system restart."
::= { ituAlarmActiveStatsEntry 9 }
ituAlarmActiveStatsWarnings OBJECT-TYPE
SYNTAX ZeroBasedCounter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"A count of the total number of active alarms with a
ituAlarmPerceivedSeverity of warning since system restart."
::= { ituAlarmActiveStatsEntry 10 }
-- Conformance
ituAlarmConformance OBJECT IDENTIFIER ::= { ituAlarmMIB 2 }
ituAlarmCompliances OBJECT IDENTIFIER ::= { ituAlarmConformance 1 }
ituAlarmCompliance MODULE-COMPLIANCE
STATUS current
DESCRIPTION
"The compliance statement for systems supporting
the ITU Alarm MIB."
MODULE -- this module
MANDATORY-GROUPS {
ituAlarmGroup
}
GROUP ituAlarmServiceUserGroup
DESCRIPTION
"This group is optional."
GROUP ituAlarmSecurityGroup
DESCRIPTION
"This group is optional."
GROUP ituAlarmStatisticsGroup
DESCRIPTION
"This group is optional."
::= { ituAlarmCompliances 1 }
ituAlarmGroups OBJECT IDENTIFIER ::= { ituAlarmConformance 2 }
ituAlarmGroup OBJECT-GROUP
OBJECTS {
ituAlarmEventType,
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ituAlarmProbableCause,
ituAlarmGenericModel
}
STATUS current
DESCRIPTION
"ITU alarm details list group."
::= { ituAlarmGroups 1}
ituAlarmServiceUserGroup OBJECT-GROUP
OBJECTS {
ituAlarmAdditionalText,
ituAlarmActiveTrendIndication
}
STATUS current
DESCRIPTION
"The use of these parameters is a service-user option."
::= { ituAlarmGroups 2 }
ituAlarmSecurityGroup OBJECT-GROUP
OBJECTS {
ituAlarmActiveDetector,
ituAlarmActiveServiceProvider,
ituAlarmActiveServiceUser
}
STATUS current
DESCRIPTION
"Security Alarm Reporting Function"
REFERENCE
"ITU Recommendation X.736, 'Information Technology - Open
Systems Interconnection - System Management: Security
Alarm Reporting Function', 1992"
::= { ituAlarmGroups 3 }
ituAlarmStatisticsGroup OBJECT-GROUP
OBJECTS {
ituAlarmActiveStatsIndeterminateCurrent,
ituAlarmActiveStatsCriticalCurrent,
ituAlarmActiveStatsMajorCurrent,
ituAlarmActiveStatsMinorCurrent,
ituAlarmActiveStatsWarningCurrent,
ituAlarmActiveStatsIndeterminates,
ituAlarmActiveStatsCriticals,
ituAlarmActiveStatsMajors,
ituAlarmActiveStatsMinors,
ituAlarmActiveStatsWarnings
}
STATUS current
DESCRIPTION
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"ITU Active Alarm Statistics."
::= { ituAlarmGroups 4 }
END
6. Examples
6.1. Alarms Based on linkUp/linkDown Notifications
This example demonstrates an interface-based alarm that goes into a
state of "warning" when a linkDown Notification [RFC2863] occurs but
the ifAdminStatus indicates the interface was taken down
administratively. If IfAdminStatus is "up" when the linkDown
Notification occurs, then there is a problem, so the state of the
alarm is critical. A linkUp alarm clears the alarm.
linkDown NOTIFICATION-TYPE
OBJECTS { ifIndex, ifAdminStatus, ifOperStatus }
STATUS current
DESCRIPTION
""
::= { snmpTraps 3 }
linkUp NOTIFICATION-TYPE
OBJECTS { ifIndex, ifAdminStatus, ifOperStatus }
STATUS current
DESCRIPTION
""
::= { snmpTraps 4 }
alarmModelIndex 3
alarmModelState 1
alarmModelNotificationId linkUp
alarmModelVarbindIndex 0
alarmModelVarbindValue 0
alarmModelDescription "linkUp"
alarmModelSpecificPointer ituAlarmEntry.3.1
alarmModelVarbindSubtree ifIndex (1.3.6.1.2.1.2.2.1.1)
alarmModelResourcePrefix 0.0
alarmModelRowStatus active (1)
ituAlarmEventType communicationsAlarm (2)
ituAlarmPerceivedSeverity cleared (1)
ituAlarmGenericModel alarmModelEntry.3.1
alarmModelIndex 3
alarmModelState 2
alarmModelNotificationId linkDown
alarmModelVarbindIndex 2
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alarmModelVarbindValue down (2)
alarmModelDescription "linkDown administratively"
alarmModelSpecificPointer ituAlarmEntry.3.6
alarmModelVarbindSubtree ifIndex (1.3.6.1.2.1.2.2.1.1)
alarmModelResourcePrefix 0.0
alarmModelRowStatus active (1)
ituAlarmEventType communicationsAlarm (2)
ituAlarmPerceivedSeverity warning (6)
ituAlarmGenericModel alarmModelEntry.3.2
alarmModelIndex 3
alarmModelState 3
alarmModelNotificationId linkDown
alarmModelVarbindIndex 2
alarmModelVarbindValue up (1)
alarmModelDescription "linkDown - confirmed problem"
alarmModelSpecificPointer ituAlarmEntry.3.3
alarmModelVarbindSubtree ifIndex (1.3.6.1.2.1.2.2.1.1)
alarmModelResourcePrefix 0.0
alarmModelRowStatus active (1)
ituAlarmEventType communicationsAlarm (2)
ituAlarmPerceivedSeverity critical (3)
ituAlarmGenericModel alarmModelEntry.3.3
alarmActiveIndex 1
alarmActiveDateAndTime 2342464573
alarmActiveDateAndTime DateAndTime,
alarmActiveEngineID SnmpEngineID,
alarmActiveEngineAddressType ipV4
alarmActiveEngineAddress 10.10.10.10
alarmActiveContextName SnmpAdminString,
alarmActiveVariables 3
alarmActiveNotificationID 1.3.6.1.6.3.1.1.5.3
alarmActiveResourceId 1.3.6.1.2.1.2.2.1.1.346
alarmActiveLogPointer 0.0
alarmActiveModelPointer alarmModelEntry.3.3
alarmActiveSpecificPointer ituAlarmActiveEntry.1.3
ituAlarmActiveTrendIndication moreSevere (1)
ituAlarmDetector 0.0
ituAlarmServiceProvider 0.0
ituAlarmServiceUser 0.0
alarmActiveVariableIndex 1
alarmActiveVariableID sysUpTime.0
alarmActiveVariableValueType timeTicks(3)
alarmActiveVariableCounter32Val 0
alarmActiveVariableUnsigned32Val 0
alarmActiveVariableTimeTicksVal 46754
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alarmActiveVariableInteger32Val 0
alarmActiveVariableOctetStringVal ""
alarmActiveVariableIpAddressVal 0
alarmActiveVariableOidVal 0.0
alarmActiveVariableCounter64Val 0
alarmActiveVariableIndex 2
alarmActiveVariableID snmpTrapOID.0
alarmActiveVariableValueType objectId(7)
alarmActiveVariableCounter32Val 0
alarmActiveVariableUnsigned32Val 0
alarmActiveVariableTimeTicksVal 0
alarmActiveVariableInteger32Val 0
alarmActiveVariableOctetStringVal ""
alarmActiveVariableIpAddressVal 0
alarmActiveVariableOidVal 1.3.6.1.6.3.1.1.5.3
alarmActiveVariableCounter64Val 0
alarmActiveVariableIndex 3
alarmActiveVariableID ifIndex
alarmActiveVariableValueType integer32(4)
alarmActiveVariableCounter32Val 0
alarmActiveVariableUnsigned32Val 0
alarmActiveVariableTimeTicksVal 0
alarmActiveVariableInteger32Val 346
alarmActiveVariableOctetStringVal ""
alarmActiveVariableIpAddressVal 0
alarmActiveVariableOidVal 0.0
alarmActiveVariableCounter64Val 0
alarmActiveVariableIndex 4
alarmActiveVariableID ifAdminStatus
alarmActiveVariableValueType integer32(4)
alarmActiveVariableCounter32Val 0
alarmActiveVariableUnsigned32Val 0
alarmActiveVariableTimeTicksVal 0
alarmActiveVariableInteger32Val up (1)
alarmActiveVariableOctetStringVal ""
alarmActiveVariableIpAddressVal 0
alarmActiveVariableOidVal 0.0
alarmActiveVariableCounter64Val 0
alarmActiveVariableIndex 5
alarmActiveVariableID ifOperStatus
alarmActiveVariableValueType integer32(4)
alarmActiveVariableCounter32Val 0
alarmActiveVariableUnsigned32Val 0
alarmActiveVariableTimeTicksVal 0
alarmActiveVariableInteger32Val down(2)
alarmActiveVariableOctetStringVal ""
alarmActiveVariableIpAddressVal 0
alarmActiveVariableOidVal 0.0
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alarmActiveVariableCounter64Val 0
alarmActiveVariableOpaqueVal
6.2. Temperature Alarms Using Generic Notifications
Consider a system able to detect four different temperature states
for a widget - normal, minor, major, critical. The system does not
have any Notification definitions for these alarm states. A
temperature alarm can be modelled using the generic alarm
Notifications of alarmClearState and alarmActive.
alarmModelIndex 5
alarmModelState 1
alarmModelNotificationId alarmClearState
alarmModelVarbindIndex 2
alarmModelVarbindValue cleared (1)
alarmModelDescription "Acme Widget Temperature Normal"
alarmModelSpecificPointer ituAlarmEntry.5.1
alarmModelVarbindSubtree alarmActiveResourceId
alarmModelResourcePrefix 0.0
alarmModelRowStatus active (1)
ituAlarmEventType environmentalAlarm (6)
ituPerceivedSeverity cleared (1)
ituAlarmGenericModel alarmModelEntry.5.1
alarmModelIndex 5
alarmModelState 2
alarmModelNotificationId alarmActiveState
alarmModelVarbindIndex 2
alarmModelVarbindValue minor (5)
alarmModelDescription "Acme Widget Temperature Minor"
alarmModelSpecificPointer ituAlarmEntry.5.5
alarmModelVarbindSubtree alarmActiveResourceId
alarmModelResourcePrefix 0.0
alarmModelRowStatus active (1)
ituAlarmEventState environmentalAlarm (6)
ituPerceivedSeverity minor (5)
ituAlarmGenericModel alarmModelEntry.5.2
alarmModelIndex 5
alarmModelState 3
alarmModelNotificationId alarmActiveState
alarmModelVarbindIndex 2
alarmModelVarbindValue major (4)
alarmModelDescription "Acme Widget Temperature Major"
alarmModelSpecificPointer ituAlarmEntry.5.4
alarmModelVarbindSubtree alarmActiveResourceId
alarmModelResourcePrefix 0.0
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alarmModelRowStatus active (1)
ituAlarmEventType environmentalAlarm (6)
ituPerceivedSeverity major (4)
ituAlarmGenericModel alarmModelEntry.5.3
alarmModelIndex 5
alarmModelState 4
alarmModelNotificationId alarmActiveState
alarmModelVarbindIndex 2
alarmModelVarbindValue critical (3)
alarmModelDescription "Acme Widget Temperature Critical"
alarmModelSpecificPointer ituAlarmEntry.5.3
alarmModelVarbindSubtree alarmActiveResourceId
alarmModelResourcePrefix 0.0
alarmModelRowStatus active (1)
ituAlarmEventType environmentalAlarm (6)
ituPerceivedSeverity critical (3)
ituAlarmGenericModel alarmModelEntry.5.4
6.3. Temperature Alarms Without Notifications
Consider a system able to detect four different temperature states
for a widget - normal, minor, major, critical. The system does not
have any Notification definitions for these alarm states. A
temperature alarm can be modelled without specifying any
Notifications in the alarm model. When a temperature state other
than normal is detected, an instance of this alarm would be added to
the active alarm table, but no Notifications would be sent out.
This could alternatively be accomplished using the models from
example 6.2 and by not specifying any target managers in the SNMP-
TARGET-MIB, which would allow the alarm state Notifications to be
logged in the Notification Log while still preventing Notifications
from being transmitted on the wire.
alarmModelIndex 6
alarmModelState 1
alarmModelNotificationId 0.0
alarmModelVarbindIndex 0
alarmModelVarbindValue 0
alarmModelDescription "Widget Temperature"
alarmModelSpecificPointer ituAlarmEntry.6.1
alarmModelVarbindSubtree 0.0
alarmModelResourcePrefix 0.0
alarmModelRowStatus active (1)
ituAlarmEventType environmentalAlarm (6)
ituPerceivedSeverity cleared (1)
ituAlarmGenericModel alarmModelEntry.6.1
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alarmModelIndex 6
alarmModelState 2
alarmModelNotificationId 0.0
alarmModelVarbindIndex 0
alarmModelVarbindValue 0
alarmModelDescription "Widget Temperature"
alarmModelSpecificPointer ituAlarmEntry.6.5
alarmModelVarbindSubtree 0.0
alarmModelResourcePrefix 0.0
alarmModelRowStatus active (1)
ituAlarmEventState environmentalAlarm (6)
ituAlarmPerceivedSeverity minor (5)
ituAlarmGenericModel alarmModelEntry.6.2
alarmModelIndex 6
alarmModelState 3
alarmModelNotificationId 0.0
alarmModelVarbindIndex 0
alarmModelVarbindValue 0
alarmModelDescription "Widget Temperature"
alarmModelSpecificPointer ituAlarmEntry.6.4
alarmModelVarbindSubtree 0.0
alarmModelResourcePrefix 0.0
alarmModelRowStatus active (1)
ituAlarmEventType environmentalAlarm (6)
ituPerceivedSeverity major (4)
ituAlarmGenericModel alarmModelEntry.6.3
alarmModelIndex 6
alarmModelState 4
alarmModelNotificationId 0.0
alarmModelVarbindIndex 0
alarmModelVarbindValue 0
alarmModelDescription "Widget Temperature Severe"
alarmModelSpecificPointer ituAlarmEntry.6.3
alarmModelVarbindSubtree 0.0
alarmModelResourcePrefix 0.0
alarmModelRowStatus active (1)
ituAlarmEventType environmentalAlarm (6)
ituPerceivedSeverity critical (3)
ituAlarmGenericModel alarmModelEntry.6.4
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6.4. Printer MIB Alarm Example
Consider the following Notifications defined in the
printer MIB [RFC3805]:
prtAlertSeverityLevel OBJECT-TYPE
-- This value is a type 1 enumeration
SYNTAX INTEGER {
other(1),
critical(3),
warning(4)
}
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The level of severity of this alert table entry. The printer
determines the severity level assigned to each entry into the
table."
::= { prtAlertEntry 2 }
printerV2Alert NOTIFICATION-TYPE
OBJECTS { prtAlertIndex, prtAlertSeverityLevel, prtAlertGroup,
prtAlertGroupIndex, prtAlertLocation, prtAlertCode }
STATUS current
DESCRIPTION
"This trap is sent whenever a critical event is added to the
prtAlertTable."
::= { printerV2AlertPrefix 1 }
These Notifications can be used to model a printer alarm as follows:
alarmModelIndex 9 alarmModelState 1
alarmModelNotificationId alarmClearState
alarmModelVarbindIndex 0 alarmModelVarbindValue 0
alarmModelDescription "Printer Alarm"
alarmModelSpecificPointer 0.0 alarmModelVarbindSubtree
prtAlertGroup alarmModelResourcePrefix 0.0
alarmModelRowStatus active (1)
alarmModelIndex 9 alarmModelState 2
alarmModelNotificationId printerV2Alert
alarmModelVarbindIndex 2 alarmModelVarbindValue
warning (4) alarmModelDescription "Printer Alarm"
alarmModelSpecificPointer 0.0 alarmModelVarbindSubtree
prtAlertGroup alarmModelResourcePrefix 0.0
alarmModelRowStatus active (1)
alarmModelIndex 9 alarmModelState 3
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alarmModelNotificationId printerV2Alert
alarmModelVarbindIndex 2 alarmModelVarbindValue
other (1) alarmModelDescription "Printer Alarm - unknown
severity" alarmModelSpecificPointer 0.0
alarmModelVarbindSubtree prtAlertGroup
alarmModelResourcePrefix 0.0 alarmModelRowStatus
active (1)
alarmModelIndex 9 alarmModelState 4
alarmModelNotificationId printerV2Alert
alarmModelVarbindIndex 2 alarmModelVarbindValue
critical (3) alarmModelDescription "Printer Alarm"
alarmModelSpecificPointer 0.0 alarmModelVarbindSubtree
prtAlertGroup alarmModelResourcePrefix 0.0
alarmModelRowStatus active (1)
6.5. RMON Alarm Example
The RMON MIB [RFC2819] defines a mechanism for generating threshold
alarms. When the thresholds are crossed, RisingAlarm and
FallingAlarm Notifications are generated as appropriate. These
Notifications can be used to model an upper threshold alarm as
follows:
alarmModelIndex 6
alarmModelState 1
alarmModelNotificationId FallingAlarm
alarmModelVarbindIndex 0
alarmModelVarbindValue 0
alarmModelDescription "RMON Rising Clear Alarm"
alarmModelSpecificPointer 0.0
alarmModelVarbindSubtree alarmIndex
alarmModelResourcePrefix 0.0
alarmModelRowStatus active (1)
alarmModelIndex 6
alarmModelState 2
alarmModelNotificationId RisingAlarm
alarmModelVarbindIndex 0
alarmModelVarbindValue 0
alarmModelDescription "RMON Rising Alarm"
alarmModelSpecificPointer 0.0
alarmModelVarbindSubtree alarmIndex
alarmModelResourcePrefix 0.0
alarmModelRowStatus active (1)
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6.6. The Lifetime of an Alarm
The following example demonstrates the relationship between the
active alarm table, the clear alarm table and the Notification Log
MIB.
Consider a system with alarms modelled as in example 1 and which also
supports the informational Notification dsx3LineStatusChange.
dsx3LineStatusChange NOTIFICATION-TYPE
OBJECTS { dsx3LineStatus,
dsx3LineStatusLastChange }
STATUS current
DESCRIPTION
"A dsx3LineStatusChange trap is sent when the
value of an instance of dsx3LineStatus changes. It
can be utilized by an NMS to trigger polls. When
the line status change results in a lower level
line status change (i.e., ds1), then no traps for
the lower level are sent."
::= { ds3Traps 0 1 }
0. At system start, the active alarm table, alarm clear table and
the Notification Log are all empty.
___________________________ _______________________
| alarmActiveTable | | nlmLogTable |
|---------------------------| |-----------------------|
| alarmActiveIndex | alarm | | nlmLogPointer | notif.|
|---------------------------| |-----------------------|
|___________________________| |_______________________|
__________________________________________________
| alarmClearTable |
|--------------------------------------------------|
| alarmClear Index | alarm |
|--------------------------------------------------|
| | |
|__________________________________________________|
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1. Some time later, a link goes down generating a linkDown
Notification, which is sent out and logged in the
Notification Log. As this Notification is modelled as
an alarm state, an entry is added to the active alarm
table.
__________________________________________________
| alarmActiveTable |
|--------------------------------------------------|
| alarmActiveIndex | alarm |
|--------------------------------------------------|
| 1 | link down - problem confirmed |
|__________________________________________________|
_______________________________________________
| nlmLogTable |
|-----------------------------------------------|
| nlmLogPointer | Notification |
|-----------------------------------------------|
| 1 | linkdown |
|_______________________________________________|
__________________________________________________
| alarmClearTable |
|--------------------------------------------------|
| alarmClear Index | alarm |
|--------------------------------------------------|
| | |
|__________________________________________________|
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2. Some time later, the value of an instance of dsx3LineStatus
changes. This Notification is sent out and logged. As this
is not modelled into an alarm state, the active alarm table
remains unchanged.
__________________________________________________
| alarmActiveTable |
|--------------------------------------------------|
| alarmActiveIndex | alarm |
|--------------------------------------------------|
| 1 | linkDown - problem confirmed |
|__________________________________________________|
_____________________________________________
| nlmLogTable |
|---------------------------------------------|
| nlmLogPointer | Notification |
|---------------------------------------------|
| 1 | linkDown |
| 2 | dsx3LineStatusChange |
|_____________________________________________|
__________________________________________________
| alarmClearTable |
|--------------------------------------------------|
| alarmClear Index | alarm |
|--------------------------------------------------|
| | |
|__________________________________________________|
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RFC 3877 Alarm MIB September 2004
3. Some time later, the link goes back up. A linkUp Notification
is sent out and logged. As this Notification models
the clear alarm for this alarm, the alarm entry is remove
from the active alarm table. An entry is added to the
clear alarm table.
__________________________________________________
| alarmActiveTable |
|--------------------------------------------------|
| alarmActiveIndex | alarm |
|--------------------------------------------------|
|__________________________________________________|
_____________________________________________
| nlmLogTable |
|---------------------------------------------|
| nlmLogPointer | Notification |
|---------------------------------------------|
| 1 | linkDown |
| 2 | dsx3LineStatusChange |
| 3 | linkUp |
|_____________________________________________|
__________________________________________________
| alarmClearTable |
|--------------------------------------------------|
| alarmClear Index | alarm |
|--------------------------------------------------|
| 1 | linkDown - confirmed problem |
|__________________________________________________|
7. Security Considerations
There are a number of management objects defined in this MIB module
with a MAX-ACCESS clause of read-write and/or read-create. Such
objects may be considered sensitive or vulnerable in some network
environments. The support for SET operations in a non-secure
environment without proper protection can have a negative effect on
network operations.
The following objects are defined with a MAX-ACCESS clause of read-
write or read-create: alarmModelNotificationId,
alarmModelVarbindIndex, alarmModelVarbindValue,
alarmModelDescription, alarmModelSpecificPointer,
alarmModelVarbindSubtree, alarmModelResourcePrefix,
alarmModelRowStatus, alarmClearMaximum, ituAlarmEventType,
ituAlarmProbableCause, ituAlarmAdditionalText, and
ituAlarmGenericModel.
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Note that setting the value of alarmClearMaximum too low may result
in security related alarms history being prematurely lost.
Changing values of alarmModelRowStatus as part of creating and
deleting rows in the alarmModelTable result in adding new alarm
models to the system or taking them out respectively. These
operations need to be carefully planned. Adding a new model should
be made in a consistent manner to avoid the system overflow with
alarms. Taking out a model should result in the deletion of all this
model's related alarms in the system.
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 (users) that have legitimate
rights to indeed GET or SET (change/create/delete) them.
Note that the alarm throttling mechanism associated with the
alarmActiveState and alarmActiveClear notifications only applies to a
given alarm. Defining multiple alarms from the same internal
stimulus may then still result in a flood of alarms into the network.
Although the use of community strings in SNMPv1 is not considered an
effective means of providing security, security administrators SHOULD
consider whether the fact that alarmActiveContextName can reveal
community string values would make this object sensitive in their
environment.
This MIB module can provide access to information that may also be
accessed through manipulation of the SNMP-NOTIFICATION-MIB and the
NOTIFICATION-LOG-MIB. This is expressed in part through the common
indexing structure of nlmLogName [RFC3014],
snmpNotifyFilterProfileName [RFC3413], and alarmListName.
Consequently, it is RECOMMENDED that security administrators take
care to configure a coherent VACM security policy. The objects
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alarmActiveLogPointer, alarmActiveModelPointer,
alarmActiveSpecificPointer, and alarmClearModelPointer are object
identifiers that reference information to which a particular user
might not be given direct access. The structure of these object
identifiers does not permit the extraction of any sensitive
information. Two other objects, alarmClearResourceId, and
alarmActiveResourceId, are also syntactically object identifiers, but
their structure could provide a user with potentially useful
information to which he or she might not otherwise be granted access,
such as the existence of a particular resource.
For further discussion of security, see section 3.4.
8. Acknowledgements
This document is a product of the DISMAN Working Group.
9. References
9.1. Normative References
[M.3100] ITU Recommendation M.3100, "Generic Network Information
Model", 1995
[RFC1157] Case, J., Fedor, M., Schoffstall, M. and J. Davin,
"Simple Network Management Protocol (SNMP)", STD 15, RFC
1157, May 1990.
[RFC1215] Rose, M., "A Convention for defining traps for use with
the SNMP", RFC 1215, March 1991.
[RFC2021] Waldbusser, S., "Remote Network Monitoring Management
Information Base Version 2 using SMIv2", January 1997.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC2578] McCloghrie, K., Perkins, D. and J. Schoenwaelder,
"Structure of Management Information Version 2 (SMIv2)",
STD 58, RFC 2578, April 1999.
[RFC2579] McCloghrie, K., Perkins, D. and J. Schoenwaelder,
"Textual Conventions for SMIv2", STD 58, RFC 2579, April
1999.
[RFC2580] McCloghrie, K., Perkins, D. and J. Schoenwaelder,
"Conformance Statements for SMIv2", STD 58, RFC 2580,
April 1999.
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[RFC3291] Daniele, M., Haberman, B., Routhier, S. and J.
Schoenwaelder, "Textual Conventions for Internet Network
Addresses", RFC 3291, May 2002.
[RFC3411] Harrington, D., Presuhn, R. and B. Wijnen, "An
Architecture for Describing Simple Network Management
Protocol (SNMP) Management Frameworks", STD 62, RFC 3411,
December 2002.
[RFC3413] Levi, D., Meyer, P. and B. Stewart, "Simple Network
Management Protocol (SNMP) Applications", STD 62, RFC
3414, December 2002.
[RFC3415] Wijnen, B., Presuhn, R. and K. McCloghrie, "View-based
Access Control Model (VACM) for the Simple Network
Management Protocol (SNMP)", STD 62, RFC 3415, December
2002.
[RFC3416] Presuhn, R., Ed., "Version 2 of the Protocol Operations
for the Simple Network Management Protocol (SNMP)", STD
62, RFC 3416, December 2002.
[RFC3584] Frye, R., Levi, D., Routhier, S. and B. Wijnen,
"Coexistence between Version 1, Version 2, and Version 3
of the Internet-standard Network Management Framework",
BCP 74, RFC 3584, August 2003.
[X.733] ITU Recommendation X.733, "Information Technology - Open
Systems Interconnection - System Management: Alarm
Reporting Function", 1992.
[X.736] ITU Recommendation X.736, "Information Technology - Open
Systems Interconnection - System Management: Security
Alarm Reporting Function", 1992.
9.2 Informative References
[RFC1657] Willis, S., Burruss, J. and J. Chu, Ed., "Definitions of
Managed Objects for the Fourth Version of the Border
Gateway Protocol (BGP-4) using SMIv2", RFC 1657, July
1994.
[RFC2737] McCloghrie, K. and A. Bierman, "Entity MIB (version 2)",
RFC 2737, December 1999.
[RFC2819] Waldbusser, S. "Remote Network Monitoring Management
Information Base", STD 59, RFC 2819, May 2000.
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RFC 3877 Alarm MIB September 2004
[RFC2863] McCloghrie, K. and F. Kastenholz, "The Interfaces Group
MIB using SMIv2", RFC 2863, June 2000.
[RFC2981] Kavasseri, R., Ed., "Event MIB", RFC 2981, October 2000.
[RFC3014] Kavasseri, R., "Notification Log MIB", RFC 3014, November
2000.
[RFC3410] Case, J., Mundy, R., Partain, D. and B. Stewart,
"Introduction and Applicability Statements for Internet-
Standard Management Framework", RFC 3410, December 2002.
[RFC3418] Presuhn, R., Ed., "Management Information Base (MIB) for
the Simple Network Management Protocol (SNMP)", STD 62,
RFC 3418, December 2002.
[RFC3805] Bergman, R., Lewis, H. and I. McDonald, "Printer MIB v2",
RFC 3805, June 2004.
10. Authors' Addresses
Sharon Chisholm
Nortel Networks
PO Box 3511, Station C
Ottawa, Ontario, K1Y 4H7
Canada
EMail: schishol@nortelnetworks.com
Dan Romascanu
Avaya
Atidim Technology Park, Bldg. #3
Tel Aviv, 61131
Israel
Phone: +972-3-645-8414
EMail: dromasca@avaya.com
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RFC 3877 Alarm MIB September 2004
11. Full Copyright Statement
Copyright (C) The Internet Society (2004). 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
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pertain to the implementation or use of the technology described in
this document or the extent to which any license under such rights
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on the procedures with respect to rights in RFC documents can be
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The IETF invites any interested party to bring to its attention any
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this standard. Please address the information to the IETF at ietf-
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Acknowledgement
Funding for the RFC Editor function is currently provided by the
Internet Society.
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