Cisco Systems network hardware 3.6 Manual

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Cisco Systems network hardware 3.6
7-7
Cisco Active Network Abstraction Fault Management User Guide, Version 3.6 Service Pack 1
OL-14284-01
Chapter 7 Impact Analysis
Accumulating Affected Parties
• Link A down includes the accumulation of the report of its own event sequence. It also includes the
report of the BGP neighbor loss.
Accumulating the Affected Parties In an Alarm
When there are two events that form part of the same event sequence in a specific alarm, the reoccurring
affected pairs are only displayed once in the Affected Parties tab. Where there are different affected
severities reported for the same pair, the pair is marked with the severity that was reported by the latest
event, according to the time stamp.
Accumulating the Affected Parties In the Correlation Tree
Where there are two or more alarms that are part of the same correlation tree, that report on the same
affected pair of edgepoints, and have different affected severities, then the reoccurring affected pairs are
only displayed once in the Affected Parties tab. Where there are different affected severities reported for
the same pair, the pair is marked with the highest severity.
In this example, X and Y are the OIDs of edgepoints in the network and there is a service running
between them. Both of the alarms, link B down and BGP neighbor loss, report on the pair X<->Y as
affected:
• Link B down reports on X<->Y as potentially affected.
• BGP neighbor loss reports on X<->Y as real affected.
The affected severity priorities are:
• Real—Priority 1
• Recovered—Priority 2
• Potentially—Priority 3
Card out reports on X<->Y as real, affected only once.
Updating Affected Severity Over Time
Cisco ANA can update the affected severity of the same alarm report over time due because in some
cases, the affect of the fault on the network cannot be determined until the network has converged.
For example, a link-down alarm creates a series of affected severity updates over time. These updates
are added to the previous updates in the system database. In this case, the system provides the following
reports:
• The first report of a link down reports on X<->Y as potentially affected.
• Over time the VNE identifies that this service is real affected or recovered, and generates an updated
report.
• The Affected Parties tab of the Ticket Properties dialog box displays the latest severity as real
affected.
• The Affected Parties Destination Properties dialog box displays both reported severities.
This functionality is currently only available in the link-down scenario in MPLS networks.
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