Condition Correlation and Fault Isolation

If a managed device stops responding to polls, the sp fault isolation algorithm determines whether to create a critical alarm for the device or suppress its alarm state. The unreachable device is the root cause of the alarm. Condition Correlation supports setting up a correlation between a device in the Contact Lost condition and some other condition in your environment. For example, sp receives a trap from a BGP router that is reporting a lost session with a peer router. If the peer router is already in the Contact Lost state in sp, the BGPLost Session alarm can be a symptom of the Contact Lost alarm on the peer router model.
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If a managed device stops responding to polls, the
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fault isolation algorithm determines whether to create a critical alarm for the device or suppress its alarm state. The unreachable device is the root cause of the alarm. Condition Correlation supports setting up a correlation between a device in the Contact Lost condition and some other condition in your environment. For example,
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receives a trap from a BGP router that is reporting a lost session with a peer router. If the peer router is already in the Contact Lost state in
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, the BGPLost Session alarm can be a symptom of the Contact Lost alarm on the peer router model.
If the peer router in the Contact Lost state has a critical Device Has Stopped Responding to Polls alarm, the correlation is trivial. If the fault state of the peer router is suppressed by the
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fault isolation algorithm, no root cause alarm exists on this model.
You cannot correlate the actual root cause alarm with the Peer Lost alarm without special consideration from Condition Correlation. However, in Condition Correlation, the Device Contact Lost condition receives special consideration. This condition remains in force whenever a device is in the Contact Lost state, regardless of whether the device model is suppressed or has an alarm. If the device model in question is suppressed, the correlation engine locates the isolated alarm and uses it as the root cause for any correlation rules.