Cisco Systems network hardware 3.6 Manual

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Cisco Systems network hardware 3.6
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Cisco Active Network Abstraction Fault Management User Guide, Version 3.6 Service Pack 1
OL-14284-01
Chapter 1 Fault Management Overview
Basic Concepts and Terms
• Card out
• An alarm is composed of a sequence of events, each representing a specific point in the alarm’s
lifecycle.
Event
An event is an indication of a distinct occurrence that occurred at a specific point in time. Events are
derived from incoming traps and notifications, and from detected status changes. Examples of events
include:
• Port status change.
• Connectivity loss between routing protocol processes on peer routers (for example BGP neighbor
loss).
• Device reset.
• Device becoming reachable by the management station.
• User acknowledgement of an alarm.
Events are written to the Cisco ANA database once and never change.
The collected events are displayed in Cisco ANA EventVision. Refer to the Cisco Active Netowrk
Abstraction EventVision User Guide for more information.
Event Sequence
An event sequence is the set of related events which comprises a single alarm. For example,
link down > ack > link up.
Figure 1-2 Event Sequence Example
Typically, a complete event sequence includes three mandatory events:
• Alarm open (in this example a link-down event).
• Alarm clear (in this example a link-up event).
• Alarm acknowledge.
Optionally, there can be any number of alarm change events which can be triggered by new severity
events, affected services update events, and so on.
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