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Collision Rate (Dot3 Ethernet)

System.NetworkManagement.ifMIB_dot3Ethernet.Port.HighCollisionRate (UnitMonitor)

Monitors the packet collision rate on this device

Knowledge Base article:

Summary

The monitor indicates the percentage of collisions on this device. This monitor has two possible states:

Configuration

The following options can be configured on this monitor:

Option

Definition

Default

Interval

Amount of time in seconds between checks of the device status

240 seconds

Number of retries

Number of attempts in each monitoring interval before the interval's sample is discarded

3

Number of samples

Number of consecutive samples before the monitor changes state

3

Timeout

Amount of time in milliseconds to wait for a response from the device before the sample times out and a new attempt is made to sample the value

3,500 milliseconds

Threshold

Percentage of collisions

10

Causes

This monitor enters a warning state when the rate of collisions exceeds the collision threshold. The default threshold is 10.

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 calculated performance counter value that caused the health state change. Consult the device manufacturer's documentation for more information on the problem and troubleshooting procedures.

Element properties:

TargetSystem.NetworkManagement.ifMIB_dot3Ethernet_Performance_Port
Parent MonitorSystem.Health.PerformanceState
CategoryPerformanceHealth
EnabledFalse
Alert GenerateTrue
Alert SeverityMatchMonitorHealth
Alert PriorityNormal
Alert Auto ResolveTrue
Monitor TypeSystem.NetworkManagement.NetworkAdapter.HighCollisionRateThresholdMonitor.ifMIB_dot3
RemotableTrue
AccessibilityPublic
Alert Message
High Collision Rate Alert
The collision rate percent for {0} is over the specified threshold. The current value is {1}\%.
RunAsDefault

Source Code:

<UnitMonitor ID="System.NetworkManagement.ifMIB_dot3Ethernet.Port.HighCollisionRate" Accessibility="Public" Enabled="false" Target="NetworkLibrary!System.NetworkManagement.ifMIB_dot3Ethernet_Performance_Port" ParentMonitorID="SystemHealth!System.Health.PerformanceState" Remotable="true" Priority="Normal" TypeID="System.NetworkManagement.NetworkAdapter.HighCollisionRateThresholdMonitor.ifMIB_dot3" ConfirmDelivery="false">

  <Category>PerformanceHealth</Category>

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

    <AlertOnState>Warning</AlertOnState>

    <AutoResolve>true</AutoResolve>

    <AlertPriority>Normal</AlertPriority>

    <AlertSeverity>MatchMonitorHealth</AlertSeverity>

    <AlertParameters>

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

      <AlertParameter2>$Data/Context/Value$</AlertParameter2>

    </AlertParameters>

  </AlertSettings>

  <OperationalStates>

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

    <OperationalState ID="OverThreshold" MonitorTypeStateID="MTSThresholdError" HealthState="Warning"/>

  </OperationalStates>

  <Configuration>

    <Interval>300</Interval>

    <NoOfRetries>3</NoOfRetries>

    <Timeout>3500</Timeout>

    <NumberOfMatches>3</NumberOfMatches>

    <OIDifHCOutUcastPkts>.1.3.6.1.2.1.31.1.1.1.11.$Target/Property[Type="NetworkLibrary!System.NetworkManagement.NetworkAdapter"]/Index$</OIDifHCOutUcastPkts>

    <OIDifHCOutMultiCastPkts>.1.3.6.1.2.1.31.1.1.1.12.$Target/Property[Type="NetworkLibrary!System.NetworkManagement.NetworkAdapter"]/Index$</OIDifHCOutMultiCastPkts>

    <OIDifHCOutBroadcastPkts>.1.3.6.1.2.1.31.1.1.1.13.$Target/Property[Type="NetworkLibrary!System.NetworkManagement.NetworkAdapter"]/Index$</OIDifHCOutBroadcastPkts>

    <OIDdot3StatsSingleCollisionFrames>.1.3.6.1.2.1.10.7.2.1.4.$Target/Property[Type="NetworkLibrary!System.NetworkManagement.NetworkAdapter"]/Index$</OIDdot3StatsSingleCollisionFrames>

    <OIDdot3StatsMultipleCollisionFrames>.1.3.6.1.2.1.10.7.2.1.5.$Target/Property[Type="NetworkLibrary!System.NetworkManagement.NetworkAdapter"]/Index$</OIDdot3StatsMultipleCollisionFrames>

    <OIDdot3StatsExcessiveCollisions>.1.3.6.1.2.1.10.7.2.1.9.$Target/Property[Type="NetworkLibrary!System.NetworkManagement.NetworkAdapter"]/Index$</OIDdot3StatsExcessiveCollisions>

    <Threshold>10</Threshold>

  </Configuration>

</UnitMonitor>