Cisco Systems 3.6 Generic Routing Encapsulation GRE Tunnel Down/Up, GRE Tunnel Down/Up Alarm

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Chapter 4 Advanced Correlation Scenarios

Generic Routing Encapsulation (GRE) Tunnel Down/Up

Multi Route Correlation Example 4

In this example, two paths exists from CE1 to PE2. Several links went down, and there is a MPLS black hole in the multi route segment. As a result router CE1 became unreachable.

Figure 4-13

Multi Route Correlation Example 4

 

 

 

 

 

 

 

Link down

 

 

 

 

 

 

#2

 

 

 

 

Device

 

 

 

 

 

 

 

 

 

 

 

 

 

 

unreachable

 

P2

P3

Link down

 

 

 

 

 

 

 

#2

 

CE1

PE1

P1

 

P6

PE2

 

 

 

Link down

 

 

 

 

 

 

#1

MPLS

 

 

 

 

 

 

 

 

 

 

 

 

 

P4 Black hole

P5

 

 

 

 

MNG core

 

 

MNG core

182431

 

 

 

 

 

 

 

In this case the system will provide the following report:

Root cause—Device Unreachable. Link Down #2 is identified as the root cause for Device Unreachable (CE1).

Generic Routing Encapsulation (GRE) Tunnel Down/Up

Generic Routing Encapsulation (GRE) is a tunneling protocol that encapsulates a variety of network layer packets inside IP tunneling packets, creating a virtual point-to-point link to devices at remote points over an IP network. It is used on the Internet to secure virtual private networks (VPNs). GRE encapsulates the entire original packet with a standard IP header and GRE header before the IPsec process. GRE can carry multicast and broadcast traffic, making it possible to configure a routing protocol for virtual GRE tunnels. The routing protocol detects loss of connectivity and reroutes packets to the backup GRE tunnel, thus providing high resiliency.

GRE is stateless, which means that the tunnel endpoints do not monitor the state or availability of other tunnel endpoints. This feature helps service providers support IP tunnels for clients, who don't know the service provider's internal tunneling architecture. It gives clients the flexibility of reconfiguring their IP architectures without worrying about connectivity.

GRE Tunnel Down/Up Alarm

When a GRE tunnel link exists, if the status of the IP interface of the GRE tunnel edge changes to down, a GRE Tunnel Down alarm is created. The IP Interface Down alarms of both sides of the link will correlate to the GRE Tunnel Down alarm. The GRE Tunnel Down alarm will initiate an IP based flow toward the GRE destination. If an alarm is found during the flow, it will correlate to it.

 

 

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

 

 

 

 

 

 

OL-14284-01

 

 

4-13

 

 

 

 

 

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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 Flows Root-Cause AlarmsCorrelation by Key Correlation by FlowDC 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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3.6 specifications

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