![Cisco ASR 9000 Serie Configuration Manuals Download Page 24](http://html.mh-extra.com/html/cisco/asr-9000-serie/asr-9000-serie_configuration-manuals_66679024.webp)
•
Rule 1 has a root cause A and an associated non-root cause.
•
Context correlation flag is not set on Rule 1.
•
Rule 1 is applied to contexts 1 and 2.
If the context correlation flag is not set on Rule 1, a scenario in which alarm A generated from context 1 and
alarm B generated from context 2 results in the rule applying to both contexts regardless of the type of context.
If the context correlation flag is now set on Rule 1 and the same alarms are generated, they are not correlated
as they are from different contexts.
With the flag set, the correlator analyzes alarms against the rule only if alarms arrive from the same context.
In other words, if alarm A is generated from context 1 and alarm B is generated from context 2, then a
correlation does not occur.
Duration Timeout Flags
The root-cause timeout (if specified) is the alternative rule timeout to use in the situation in which a
non-root-cause alarm arrives before a root-cause alarm in the given rule. It is typically used to give a shorter
timeout in a situation under the assumption that it is less likely that the root-cause alarm arrives, and, therefore,
releases the hold on the non-root-cause alarms sooner.
Reparent Flag
The reparent flag specifies what happens to non-root-cause alarms in a hierarchical correlation when their
immediate root cause clears.
The following example illustrates context correlation behavior:
•
Rule 1 has a root cause A and an associated non-root cause B
•
Context correlation flag is not set on Rule 1
•
Rule 1 is applied to contexts 1 and 2
In this scenario, if alarm A arrives generated from context 1 and alarm B generated from context 2, then a
correlation occurs
—
regardless of context.
If the context correlation flag is now set on Rule 1 and the same alarms are generated, they are not correlated,
because they are from different contexts.
Reissue Nonbistate Flag
The reissue nonbistate flag controls whether nonbistate alarms (events) are forwarded from the correlator log
if their parent bistate root-cause alarm clears. Active bistate non-root-causes are always forwarded in this
situation, because the condition is still present.
The reissue-nonbistate flag allows you to control whether non-bistate alarms are forwarded.
Cisco ASR 9000 Series Aggregation Services Router System Monitoring Configuration Guide, Release 4.2.x
8
Implementing and Monitoring Alarms and Alarm Log Correlation
Duration Timeout Flags