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Interface Is Flapping

System.NetworkManagement.NetworkAdapter.IsFlapping (UnitMonitor)

Monitors whether the interface link is switching frequently between up and down based on SNMP traps received

Knowledge Base article:

Summary

The monitor indicates whether the device is currently flapping; that is, switching rapidly from an available to an unavailable state. This monitor has two possible states:

Causes

An error state for this monitor indicates that the interface is flapping, or switching rapidly from an available to an unavailable state.

Resolutions

Use the Health Explorer to check the details for the state change on the State Change Events tab for the monitor. This data shows the Object Identifier (OID) and the value that the device returned in response to the query. Consult the device manufacturer's documentation for the device's specific OID for more information on the problem and troubleshooting procedures.

Element properties:

TargetSystem.NetworkManagement.NetworkAdapter
Parent MonitorSystem.Health.AvailabilityState
CategoryPerformanceHealth
EnabledFalse
Alert GenerateTrue
Alert SeverityMatchMonitorHealth
Alert PriorityNormal
Alert Auto ResolveTrue
Monitor TypeSystem.NetworkManagement.RepeatedTrapTimer2StateMonitorType
RemotableTrue
AccessibilityPublic
Alert Message
Interface Flapping Alert
Interface {0} is flapping. Use health explorer to further troubleshoot this issue.
RunAsDefault

Source Code:

<UnitMonitor ID="System.NetworkManagement.NetworkAdapter.IsFlapping" Accessibility="Public" Enabled="false" Target="NetworkLibrary!System.NetworkManagement.NetworkAdapter" ParentMonitorID="SystemHealth!System.Health.AvailabilityState" Remotable="true" Priority="Normal" TypeID="System.NetworkManagement.RepeatedTrapTimer2StateMonitorType" ConfirmDelivery="false">

  <Category>PerformanceHealth</Category>

  <AlertSettings AlertMessage="System.NetworkManagement.Generic.NetworkAdapter.IsFlapping.AlertMessage">

    <AlertOnState>Error</AlertOnState>

    <AutoResolve>true</AutoResolve>

    <AlertPriority>Normal</AlertPriority>

    <AlertSeverity>MatchMonitorHealth</AlertSeverity>

    <AlertParameters>

      <AlertParameter1>$Target/Property[Type="System!System.Entity"]/DisplayName$</AlertParameter1>

    </AlertParameters>

  </AlertSettings>

  <OperationalStates>

    <OperationalState ID="Flapping" MonitorTypeStateID="RepeatedTrapRaised" HealthState="Error"/>

    <OperationalState ID="NotFlapping" MonitorTypeStateID="TimerEventRaised" HealthState="Success"/>

  </OperationalStates>

  <Configuration>

    <OIDProps>

      <OIDProp>.1.3.6.1.6.3.1.1.5.4</OIDProp>

      <OIDProp>.1.3.6.1.6.3.1.1.5.3</OIDProp>

    </OIDProps>

    <TrapExpression>

      <SimpleExpression>

        <ValueExpression>

          <XPathQuery>SnmpVarBinds/SnmpVarBind[OID=".1.3.6.1.2.1.2.2.1.1.$Target/Property[Type="NetworkLibrary!System.NetworkManagement.NetworkAdapter"]/Index$"]/Value</XPathQuery>

        </ValueExpression>

        <Operator>Equal</Operator>

        <ValueExpression>

          <Value>$Target/Property[Type="NetworkLibrary!System.NetworkManagement.NetworkAdapter"]/Index$</Value>

        </ValueExpression>

      </SimpleExpression>

    </TrapExpression>

    <ConsolidationSeconds>30</ConsolidationSeconds>

    <MatchCount>2</MatchCount>

    <TimerResetSeconds>3600</TimerResetSeconds>

  </Configuration>

</UnitMonitor>