Cisco Systems 3.6 specifications Repeating Event Sequence, Flapping Events

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Chapter 1 Fault Management Overview

Basic Concepts and Terms

Note The event types that will belong to each sequence can be configured in the system registry. An event sequence can consist of a single event (for example, “device reset”).

The set of events that should participate in Cisco ANA alarm processing can be configured in the system registry.

Repeating Event Sequence

If a new opening event arrives within a configurable timeout after the clearing event of the same alarm, the alarm is updatable, and a repeating event sequence is created, that is, the event is attached to the existing sequence and updates its severity accordingly. If the new opening event occurs after the timeout, it opens a new alarm (new event sequence).

Figure 1-3 Repeating Event Sequence

Flapping Events

If a series of events that are considered to be of a same sequence occur in the network in a certain configurable time window a certain (configurable) amount of times, the virtual network element (VNE) may (upon configuration) reduce further the number of events, and will issue a single event which will be of type “event flapping”. Only when the alarm stabilizes and the event frequency is reduced, will another update to the event sequence be issued as “event stopped flapping”. Another update will be issued with the most up-to-date event state.

Cisco Active Network Abstraction Fault Management User Guide, Version 3.6 Service Pack 1

1-4	OL-14284-01

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Contents Americas Headquarters Page N T E N T S Multi Route Correlation Cloud VNE Alarm Sending Event Correlator About This Guide ViiViii Fault Management Overview Managing EventsAlarm Basic Concepts and TermsEvent Event SequenceRepeating Event Sequence Flapping EventsCorrelation By Root Cause TicketSeverity Propagation Sequence Association and Root Cause AnalysisEvent Processing Overview OL-14284-01 Fault Detection and Isolation Unreachable Network ElementsVNE Sources of Alarms On a Device Alarm IntegrityIntegrity Service Fault Detection and Isolation Integrity Service Event Suppression Cisco ANA Event Correlation and SuppressionRoot-Cause Correlation Process Cisco ANARoot-Cause Alarms Correlation FlowsCorrelation by Key Correlation by FlowUsing Weights DC Model Correlation CacheCorrelating TCA Device Unreachable Alarm Advanced Correlation ScenariosConnectivity Test Device Fault Identification Device Unreachable ExampleIP Interface Status Down Alarm IP Interface Failure ScenariosCorrelation of Syslogs and Traps All IP Interfaces Down Alarm IP Interface Failure ExamplesInterface Example 10.200.1.2 General Interface Example ATM Examples Ethernet, Fast Ethernet, Giga Ethernet ExamplesInterface Registry Parameters Ip interface status down ParametersMulti Route Correlation Multi Route Correlation Example11 Multi Route Correlation Example GRE Tunnel Down/Up Alarm Generic Routing Encapsulation GRE Tunnel Down/UpGRE Tunnel Down Correlation Example 14 GRE Tunnel Down Example 1 Single GRE Tunnel15 GRE Tunnel Down Example 2 Multiple GRE Tunnels 16 Alarms Correlation to GRE Tunnel Down Ticket BGP Process Down Alarm Mpls Interface Removed AlarmLDP Neighbor Down Alarm OL-14284-01 Correlation Over Unmanaged Segments Cloud VNETypes of Unmanaged Networks Supported Supported When Logical Inventory Physical Inventory Cloud Problem Alarm Cloud Correlation ExampleOL-14284-01 Event and Alarm Configuration Parameters Alarm Type DefinitionEvent Sub-Type Configuration Parameters Root Cause Configuration ParametersGeneral Event Parameters Correlation Configuration Parameters Network Correlation ParametersSystem Correlation Configuration Parameters Flapping Event Definitions ParametersImpact Analysis Impact Analysis OptionsImpact Report Structure Affected SeveritiesImpact Analysis GUI Affected Parties TabViewing a Detailed Report For the Affected Pair Detailed Report For the Affected Pair Disabling Impact Analysis Accumulating Affected PartiesAccumulating the Affected Parties In an Alarm Accumulating the Affected Parties In the Correlation TreeUpdating Affected Severity Over Time OL-14284-01 Supported Service Alarms BGP process up Shut down on a deviceAll ip interfaces Sent when all IP interfaces True Warnin Shelf Out Rx Dormant Tx DormantLink Over Utilized OL-14284-01 Event and Alarm Correlation Flow Software Function Architecture Figure B-1 Event Correlation Flow VNE levelEvent Correlation Flow Event Creation VNE levelEvent Correlation Alarm Sending Event Correlator Correlation Logic Event CorrelatorPost-Correlation Rule Event Correlator

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