Alarm Correlation - Huawei AR150 Series Configuration Manual

Huawei AR150&200&1200&2200&3200 Series Enterprise
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Configuration Guide - Device Management
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4.2.4 Alarm Correlation

When an NE on the network is faulty, the system reports the predictable network faults to the
NMS. Each fault triggers multiple alarms, affecting the efficiency for locating faults. Some
alarms are triggered by the same fault, so they are associated with each other. The alarm
correlation function can analyze the association among alarms generated in the system and
determine root-cause and non-root-cause alarms. After alarm correlation suppression is
configured, the system reports only root-cause alarms to the NMS, improving the efficiency for
locating faults. Alarm correlation reduces the number of reported non-root-cause alarms, reduces
the network load, and helps quickly locate faults.
Alarm correlation includes alarm correlation analysis and alarm correlation suppression.
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Issue 05 (2014-01-16)
Severity
Indeterminate
Cleared
Alarm correlation analysis
Alarm correlation analysis is performed based on the alarm definition, including the fault
time window, fault rectification time window, what the root-cause alarm is, and the method
of association with the root-cause alarm. After receiving an alarm, the fault management
module analyzes the alarm correlation within the duration specified by the fault time
window, and sends the alarm with the analysis result to the NMS.
Figure 4-1 shows the alarm correlation analysis flow.
Figure 4-1 Alarm correlation analysis flow
Active &
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Independent
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Active &
Dependent
The status of an alarm can be:
– Active & Independent: An active root-cause alarm is in the period specified by the fault
time window.
– Active & Dependent: An active non-root-cause alarm is in the period specified by the
fault time window.
– Persistent Event: An alarm enters the active alarm queue.
– Filtered Out: An alarm and its clear alarm are both deleted from the active alarm queue.
The process of alarm correlation analysis is as follows:
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Description
Indicates that the severity of an alarm cannot be determined.
Indicates that one or more previous alarms have been cleared.
Persistent
3
Event
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Filtered Out
4 Fault Management Configuration
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