Cisco Systems 3.6 specifications Sources of Alarms On a Device, Alarm Integrity, Integrity Service

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Chapter 2 Fault Detection and Isolation

Sources of Alarms On a Device

Sources of Alarms On a Device

The following basic sources of alarms exist in the system which indicate a problem in the network:

•Service Alarms—Alarms generated by the VNE as a result of polling (for example SNMP, Telnet). Usually such alarms (for example link down, card out, device unreachable and so on) are configured in such a way that they can become root cause alarms, according to the correlation algorithms.

Service alarms can also be generated by the gateway, for example. the vpn leak alarm.

•SNMP Traps—Traps sent by the network elements and captured by the Cisco ANA platform. The platform supports SNMP v1, v2 and v3 traps. The traps are then forwarded to the specific VNEs for further processing and correlation logic. In addition, reliable traps (inform commands) are supported, when configured in the registry, where the VNE acknowledges that a trap was received.

•Syslogs—Syslog messages sent by the network elements and captured by the Cisco ANA platform. The Syslogs are then forwarded to the specific VNEs for further processing and correlation logic.

•TCA—Cisco ANA can be used to set a TCA for soft properties. The TCA can be enabled to assign a condition to the property which will trigger an alarm when violated. The alarm conditions could be:

–Equal or not equal to a target value.

–Exceeding a defined value range (defined by maximum and minimum thresholds, including hysteresis), for example CPU level of a device.

–Exceeding a defined rate (calculated across time), for example bandwidth or utilization rate of a link.

•System Alarms—Alarms generated by the gateway and/or the units, for example, disk full, database full, unit unreachable and so on. For more information see Integrity Service.

For information about TCAs see the Cisco Active Network Abstraction Customization User Guide.

Alarm Integrity

When the VNE shuts down while it still has open alarms associated with it, “fixing” events which occur during the down period will be consolidated when the VNE is reloaded.

Integrity Service

The integrity service is an internal service that runs on the gateway and/or the units, which is responsible for the stability of the system by running integrity tests in order to maintain the database and eliminate clutter in the system. In order to prevent the session from stopping, the integrity service tests are run on a different thread in a separate directory called integrity.

The service integrity tests are run:

•Manually—The integrity service tests are accessed as part of the Cisco ANA Shell management services, and they can be accessed by telneting the gateway.

To run a test, the user should cd to the integrity dir, and then enter executeTest followed by the test name. The user can pass parameters to the tests using Cisco ANA Shell.

•Automatically—The integrity service tests are scheduled as crontab commands, to run specific tests at specific intervals. By default the integrity service tests run automatically every 12 hours.

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

 

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 Vii About This GuideViii Managing Events Fault Management OverviewBasic Concepts and Terms AlarmEvent Sequence EventFlapping Events Repeating Event SequenceTicket Correlation By Root CauseSequence Association and Root Cause Analysis Severity PropagationEvent Processing Overview OL-14284-01 Unreachable Network Elements Fault Detection and IsolationVNE Alarm Integrity Sources of Alarms On a DeviceIntegrity Service Fault Detection and Isolation Integrity Service Cisco ANA Event Correlation and Suppression Event SuppressionCisco ANA Root-Cause Correlation ProcessCorrelation by Flow Root-Cause AlarmsCorrelation Flows Correlation by KeyDC Model Correlation Cache Using WeightsCorrelating TCA Advanced Correlation Scenarios Device Unreachable AlarmConnectivity Test Device Unreachable Example Device Fault IdentificationIP Interface Failure Scenarios IP Interface Status Down AlarmCorrelation of Syslogs and Traps IP Interface Failure Examples All IP Interfaces Down AlarmInterface Example 10.200.1.2 General Interface Example Ethernet, Fast Ethernet, Giga Ethernet Examples ATM ExamplesIp interface status down Parameters Interface Registry ParametersMulti Route Correlation Example Multi Route Correlation11 Multi Route Correlation Example Generic Routing Encapsulation GRE Tunnel Down/Up GRE Tunnel Down/Up Alarm14 GRE Tunnel Down Example 1 Single GRE Tunnel GRE Tunnel Down Correlation Example15 GRE Tunnel Down Example 2 Multiple GRE Tunnels 16 Alarms Correlation to GRE Tunnel Down Ticket Mpls Interface Removed Alarm BGP Process Down AlarmLDP Neighbor Down Alarm OL-14284-01 Cloud VNE Correlation Over Unmanaged SegmentsTypes of Unmanaged Networks Supported Supported When Logical Inventory Physical Inventory Cloud Correlation Example Cloud Problem AlarmOL-14284-01 Alarm Type Definition Event and Alarm Configuration ParametersRoot Cause Configuration Parameters Event Sub-Type Configuration ParametersGeneral Event Parameters Network Correlation Parameters Correlation Configuration ParametersFlapping Event Definitions Parameters System Correlation Configuration ParametersImpact Analysis Options Impact AnalysisAffected Severities Impact Report StructureAffected Parties Tab Impact Analysis GUIViewing a Detailed Report For the Affected Pair Detailed Report For the Affected Pair Accumulating Affected Parties Disabling Impact AnalysisAccumulating the Affected Parties In the Correlation Tree Accumulating the Affected Parties In an AlarmUpdating Affected Severity Over Time OL-14284-01 BGP process up Shut down on a device Supported Service AlarmsAll ip interfaces Sent when all IP interfaces True Warnin Shelf Out Tx Dormant Rx DormantLink Over Utilized OL-14284-01 Event and Alarm Correlation Flow Figure B-1 Event Correlation Flow VNE level Software Function ArchitectureEvent Creation VNE level Event Correlation FlowEvent Correlation Correlation Logic Event Correlator Alarm Sending Event CorrelatorPost-Correlation Rule Event Correlator
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