Cisco Systems 3.6 specifications GRE Tunnel Down Correlation Example

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Chapter 4 Advanced Correlation Scenarios

Generic Routing Encapsulation (GRE) Tunnel Down/Up

Note The GRE Tunnel Alarm Down is supported only on GRE tunnels that are configured with keepalive. When keepalive is configured on the GRE tunnel edge, if a failure occurs in the GRE tunnel link, both IP interfaces of the GRE tunnel will be in Down state. If keepalive is not configured on the GRE tunnel edge, since the alarm is generated arbitrarily from one of the tunnel devices when the IP Interface changes to the Down state, the GRE Tunnel Down alarm might not be generated.

When a failure occurs, the GRE tunnel link is marked orange. When the IP interface comes back up, a fixing alarm is sent, and the link is marked green. The GRE Tunnel Down alarm is cleared by a corresponding GRE Tunnel Up alarm. It will also be cleared when the GRE link is discovered again.

GRE Tunnel Down Correlation Example 1

The following provides an example of a GRE Tunnel Down correlation for a single GRE tunnel.

In this example:

Router 1 (R1) is connected to Router 3 (R3) through a physical link L1.

Router 3 is connected to Router 2 through a physical link L2.

Router 1 is connected to Router 2 through a GRE tunnel.

Figure 4-14 GRE Tunnel Down Example 1 (Single GRE Tunnel)

R1

L1

 

R3

 

GRE tunnel

 

L2

Physical links

R2

GRE tunnel

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When a Link Down occurs on L2, a Link Down alarm appears. A GRE Tunnel Down alarm is issued as the IP interfaces of the tunnel edge devices go down. The IP Interface Status Down alarms will correlate to the GRE Tunnel Down alarm. The GRE tunnel down will correlate to the Link Down alarm.

The system provides the following report:

Root cause—Link down: L2 Router 2 <-> Router 3

Correlated events:

GRE tunnel down Router1:tunnel <-> Router 2:tunnel

IP interface down Router 1:tunnel

IP interface down Router 2:tunnel

 

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

4-14

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 Integrity Service Sources of Alarms On a DeviceAlarm Integrity Fault Detection and Isolation Integrity Service Event Suppression Cisco ANA Event Correlation and SuppressionRoot-Cause Correlation Process Cisco ANACorrelation by Key Root-Cause AlarmsCorrelation Flows Correlation by FlowCorrelating TCA Using WeightsDC Model Correlation Cache Connectivity Test Device Unreachable AlarmAdvanced Correlation Scenarios 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 LDP Neighbor Down Alarm BGP Process Down AlarmMpls Interface Removed Alarm OL-14284-01 Types of Unmanaged Networks Supported Correlation Over Unmanaged SegmentsCloud VNE Supported When Logical Inventory Physical Inventory Cloud Problem Alarm Cloud Correlation ExampleOL-14284-01 Event and Alarm Configuration Parameters Alarm Type DefinitionGeneral Event Parameters Event Sub-Type Configuration ParametersRoot Cause Configuration 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 PartiesUpdating Affected Severity Over Time Accumulating the Affected Parties In an AlarmAccumulating the Affected Parties In the Correlation Tree 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 Link Over Utilized Rx DormantTx Dormant OL-14284-01 Event and Alarm Correlation Flow Software Function Architecture Figure B-1 Event Correlation Flow VNE levelEvent Correlation Event Correlation FlowEvent Creation VNE level Post-Correlation Rule Event Correlator Alarm Sending Event CorrelatorCorrelation Logic Event Correlator
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3.6 specifications

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