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Inbound Discarded Packets

Microsoft.SystemCenter.NetworkDevice.Interface.InboundDiscardThresholdMonitor (UnitMonitor)

Performance health state monitor that will show error state and alert when inbound discarded packets exceed the defined threshold

Knowledge Base article:

Summary

Inbound Packects DIscarded Threshold Monitor

Causes

Below are the details of the Object Identifier (OID) that is queried via an SNMP GET

Object

OID

Description

ifInDiscards

1.3.6.1.2.1.2.2.1.13

The number of inbound packets which were chosen to be discarded even though no errors had been detected to prevent their being deliverable to a higher-layer protocol. One possible reason for discarding such a packet could be to free up buffer space.

Resolutions

Below are some basic troubleshooting steps

  1. Check the cabling to the device.

  2. Perform any vendor specific hardware tests on the device to determine if the device's hardware is functioning properly

  3. Raise the threshold on the monitor. This will allow for better "tuning" of the application to your environment. Take care no to raise the threshold too much as this could allow important events to go unnoticed.

Element properties:

TargetMicrosoft.SystemCenter.NetworkDevice.Interface
Parent MonitorSystem.Health.PerformanceState
CategoryPerformanceHealth
EnabledFalse
Alert GenerateTrue
Alert SeverityError
Alert PriorityNormal
Alert Auto ResolveFalse
Monitor TypeMicrosoft.SystemCenter.NetworkDevice.SnmpDeltaThresholdMonitorType
RemotableTrue
AccessibilityPublic
Alert Message
Inbound Discarded Packets Exceed Threshold
The number of inbound discarded packets during the polling interval exceeded the specified threshold.
RunAsDefault

Source Code:

<UnitMonitor ID="Microsoft.SystemCenter.NetworkDevice.Interface.InboundDiscardThresholdMonitor" Accessibility="Public" Enabled="false" Target="Microsoft.SystemCenter.NetworkDevice.Interface" ParentMonitorID="Health!System.Health.PerformanceState" Remotable="true" Priority="Normal" TypeID="Microsoft.SystemCenter.NetworkDevice.SnmpDeltaThresholdMonitorType" ConfirmDelivery="false">

  <Category>PerformanceHealth</Category>

  <AlertSettings AlertMessage="Microsoft.SystemCenter.NetworkDevice.Interface.InboundDiscardThresholdMonitor.AlertMessage">

    <AlertOnState>Error</AlertOnState>

    <AutoResolve>false</AutoResolve>

    <AlertPriority>Normal</AlertPriority>

  </AlertSettings>

  <OperationalStates>

    <OperationalState HealthState="Success" MonitorTypeStateID="UnderThreshold" ID="BelowThreshold"/>

    <OperationalState HealthState="Error" MonitorTypeStateID="OverThreshold" ID="AboveThreshold"/>

  </OperationalStates>

  <Configuration>

    <Interval>180</Interval>

    <IP>$Target/Host/Property[Type="NetworkDevice!Microsoft.SystemCenter.NetworkDevice"]/IPAddress$</IP>

    <CommunityString>$Target/Host/Property[Type="NetworkDevice!Microsoft.SystemCenter.NetworkDevice"]/CommunityString$</CommunityString>

    <Version>$Target/Host/Property[Type="NetworkDevice!Microsoft.SystemCenter.NetworkDevice"]/Version$</Version>

    <SnmpVarBinds>

      <SnmpVarBind>

        <OID>1.3.6.1.2.1.2.2.1.13.$Target/Property[Type="Microsoft.SystemCenter.NetworkDevice.Interface"]/ifIndex$</OID>

        <Syntax>0</Syntax>

        <Value VariantType="8"/>

      </SnmpVarBind>

    </SnmpVarBinds>

    <Threshold>0</Threshold>

  </Configuration>

</UnitMonitor>