ITU-ALARM-MIB

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Organization: IETF Distributed Management Working Group

Last Updated: 2004-09-09

Category: Alarm and Event Management

Description: Defines managed objects for ITU alarm modelling based on ITU-T M.3100 standards, supplementing the generic IETF Alarm MIB.

IPNetwork Monitor uses several OIDs from this MIB in network discovery and polling the applicable devices. Start monitoring ITU-ALARM-MIB with a free 30-day trial of IPNetwork Monitor.

What Is ITU-ALARM-MIB?

ITU-ALARM-MIB is an IETF standards-track MIB (RFC 3877 companion) that models telecom alarms per ITU-T Recommendations M.3100, X.733, and X.736, supplementing the generic IETF Alarm MIB with ITU-specific alarm semantics. It exposes alarm records including perceived severity, event type, probable cause, and free-text detail, plus an 'active alarms' table tracking currently outstanding conditions. It is squarely a faults/traps-oriented MIB used for monitoring software/hardware status indirectly: it reports the alarm/fault state of managed elements (severity trending, detecting entity, service provider context) rather than raw performance counters. It explicitly builds on and extends RFC 3877's generic Alarm MIB and ITU-T M.3100/X.733/X.736 alarm models, and network engineers new to telecom fault management often use the ITU-ALARM-MIB guide provided with these RFCs to understand how perceived severity and probable cause map onto ITU-T alarm semantics. Deployment context is telecom network elements and NMS/EMS systems in carrier and service-provider networks requiring standardized alarm reporting.

IPNetwork Monitor allows you to monitor SNMP objects defined in ITU-ALARM-MIB. Use the built-in SNMP Monitoring Browser to explore available variables, view their current values and descriptions, and select the objects you want to monitor. You can then create SNMP monitors, configure thresholds, and receive alerts when monitored values change.

Supported Devices

vendor-neutral, standards-based MIB, not tied to a specific manufacturer
telecom network element (managed per ITU-T M.3100 alarm model)

Monitoring Examples

An NMS would poll ituAlarmActiveTable/ituAlarmActiveEntry to enumerate all currently active alarms, reading ituAlarmActiveTrendIndication to see if a condition is worsening, improving, or stable, and ituAlarmActiveDetector/ituAlarmActiveServiceProvider to identify which subsystem raised it. The historical ituAlarmTable/ituAlarmEntry would be queried for ituAlarmPerceivedSeverity, ituAlarmEventType, ituAlarmProbableCause, and ituAlarmAdditionalText to diagnose a specific fault event, e.g. a critical-severity communications alarm with a probable cause of loss-of-signal.

What Can Be Monitored

active alarm list and severity trend
alarm perceived severity
alarm event type and probable cause
alarm detecting entity/service provider
additional alarm free-text detail

Imported Objects

From ALARM-MIB

alarmActiveDateAndTime	OBJECT-TYPE
alarmActiveIndex	OBJECT-TYPE
alarmListName	OBJECT-TYPE
alarmModelIndex	OBJECT-TYPE

From IANA-ITU-ALARM-TC-MIB

IANAItuEventType
IANAItuProbableCause

From ITU-ALARM-TC-MIB

ItuPerceivedSeverity
ItuTrendIndication

From RMON2-MIB

ZeroBasedCounter32

From SNMP-FRAMEWORK-MIB

SnmpAdminString

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

Gauge32
MODULE-IDENTITY
OBJECT-TYPE
mib-2

From SNMPv2-TC

AutonomousType
RowPointer

OIDs

OID symbolic	OID numeric	Type	Access	Description
ituAlarmActive	1.3.6.1.2.1.121.1.2
OID ituAlarmActiveDetector	1.3.6.1.2.1.121.1.2.1.1.2	AutonomousType	read-only	Represents the SecurityAlarmDetector object.
ituAlarmActiveEntry	1.3.6.1.2.1.121.1.2.1.1		not-accessible	Entries appear in this table when alarms are active. They are removed when the alarm is no longer occurring.
OID ituAlarmActiveServiceProvider	1.3.6.1.2.1.121.1.2.1.1.3	AutonomousType	read-only	Represents the ServiceProvider object.
OID ituAlarmActiveServiceUser	1.3.6.1.2.1.121.1.2.1.1.4	AutonomousType	read-only	Represents the ServiceUser object.
G32 ituAlarmActiveStatsCriticalCurrent	1.3.6.1.2.1.121.1.2.2.1.2	Gauge32	read-only	A count of the current number of active alarms with a ituAlarmPerceivedSeverity of critical.
NUM ituAlarmActiveStatsCriticals	1.3.6.1.2.1.121.1.2.2.1.7	ZeroBasedCounter32	read-only	A count of the total number of active alarms with a ituAlarmPerceivedSeverity of critical since system restart.
ituAlarmActiveStatsEntry	1.3.6.1.2.1.121.1.2.2.1		not-accessible	Statistics on the current active ITU alarms.
G32 ituAlarmActiveStatsIndeterminateCurrent	1.3.6.1.2.1.121.1.2.2.1.1	Gauge32	read-only	A count of the current number of active alarms with a ituAlarmPerceivedSeverity of indeterminate.
NUM ituAlarmActiveStatsIndeterminates	1.3.6.1.2.1.121.1.2.2.1.6	ZeroBasedCounter32	read-only	A count of the total number of active alarms with a ituAlarmPerceivedSeverity of indeterminate since system restart.
G32 ituAlarmActiveStatsMajorCurrent	1.3.6.1.2.1.121.1.2.2.1.3	Gauge32	read-only	A count of the current number of active alarms with a ituAlarmPerceivedSeverity of major.
NUM ituAlarmActiveStatsMajors	1.3.6.1.2.1.121.1.2.2.1.8	ZeroBasedCounter32	read-only	A count of the total number of active alarms with a ituAlarmPerceivedSeverity of major since system restart.
G32 ituAlarmActiveStatsMinorCurrent	1.3.6.1.2.1.121.1.2.2.1.4	Gauge32	read-only	A count of the current number of active alarms with a ituAlarmPerceivedSeverity of minor.
NUM ituAlarmActiveStatsMinors	1.3.6.1.2.1.121.1.2.2.1.9	ZeroBasedCounter32	read-only	A count of the total number of active alarms with a ituAlarmPerceivedSeverity of minor since system restart.
ituAlarmActiveStatsTable	1.3.6.1.2.1.121.1.2.2		not-accessible	This table represents the ITU alarm statistics information.
G32 ituAlarmActiveStatsWarningCurrent	1.3.6.1.2.1.121.1.2.2.1.5	Gauge32	read-only	A count of the current number of active alarms with a ituAlarmPerceivedSeverity of warning.
NUM ituAlarmActiveStatsWarnings	1.3.6.1.2.1.121.1.2.2.1.10	ZeroBasedCounter32	read-only	A count of the total number of active alarms with a ituAlarmPerceivedSeverity of warning since system restart.
ituAlarmActiveTable	1.3.6.1.2.1.121.1.2.1		not-accessible	A table of ITU information for active alarms entries.
ITU ituAlarmActiveTrendIndication	1.3.6.1.2.1.121.1.2.1.1.1	ItuTrendIndication	read-only	Represents the trend indication values for the alarms.
STR ituAlarmAdditionalText	1.3.6.1.2.1.121.1.1.1.1.4	SnmpAdminString	read-write	Represents the additional text field for the alarm.
ituAlarmCompliance	1.3.6.1.2.1.121.2.1.1			The compliance statement for systems supporting the ITU Alarm MIB.
ituAlarmCompliances	1.3.6.1.2.1.121.2.1
ituAlarmConformance	1.3.6.1.2.1.121.2
ituAlarmEntry	1.3.6.1.2.1.121.1.1.1.1		not-accessible	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: 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.
IAN ituAlarmEventType	1.3.6.1.2.1.121.1.1.1.1.2	IANAItuEventType	read-write	Represents the event type values for the alarms
NUM ituAlarmGenericModel	1.3.6.1.2.1.121.1.1.1.1.5	RowPointer	read-write	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 in the description of ituAlarmEntry to determine the appropriate { alarmListName, alarmModelIndex, alarmModelState } for this { alarmListName, alarmModelIndex, ituAlarmPerceivedSeverity }.
ituAlarmGroup	1.3.6.1.2.1.121.2.2.1			ITU alarm details list group.
ituAlarmGroups	1.3.6.1.2.1.121.2.2
ituAlarmMIB	1.3.6.1.2.1.121			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
ituAlarmModel	1.3.6.1.2.1.121.1.1
ituAlarmObjects	1.3.6.1.2.1.121.1
ITU ituAlarmPerceivedSeverity	1.3.6.1.2.1.121.1.1.1.1.1	ItuPerceivedSeverity	not-accessible	ITU perceived severity values.
IAN ituAlarmProbableCause	1.3.6.1.2.1.121.1.1.1.1.3	IANAItuProbableCause	read-write	ITU probable cause values.
ituAlarmSecurityGroup	1.3.6.1.2.1.121.2.2.3			Security Alarm Reporting Function
ituAlarmServiceUserGroup	1.3.6.1.2.1.121.2.2.2			The use of these parameters is a service-user option.
ituAlarmStatisticsGroup	1.3.6.1.2.1.121.2.2.4			ITU Active Alarm Statistics.
ituAlarmTable	1.3.6.1.2.1.121.1.1.1		not-accessible	A table of ITU Alarm information for possible alarms on the system.

FAQ

How would a carrier NMS use ITU-ALARM-MIB to track faults on a telecom network element?
It exposes an active-alarms table plus alarm records with perceived severity, event type, probable cause, and free-text detail, letting an NMS report and trend the fault state of managed elements per the ITU-T M.3100/X.733/X.736 alarm model.

Does ITU-ALARM-MIB replace the generic IETF Alarm MIB?
No — it supplements RFC 3877's generic Alarm MIB, extending it with ITU-specific alarm semantics rather than replacing it.

RFC description

Defines management objects for ITU-T alarm monitoring and handling in telecommunications equipment (RFC 3877).

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Download ITU-ALARM-MIB

What Is ITU-ALARM-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

FAQ

RFC description