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Degraded Minutes

Microsoft.SystemCenter.NetworkDevice.Interface.DS1E1.DMThresholdMonitor (UnitMonitor)

Knowledge Base article:

Summary

Degraded Minutes Threshold Monitor. This monitor is configured to get the Degraded Minute count from the interface for the past 15 minute interval.

Causes

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

Object

OID

Description

dsx1IntervalDMs

1.3.6.1.2.1.10.18.8.1.11

A Degraded Minute is one in which the estimated error rate exceeds 1E-6 but does not exceed 1E-3. Degraded Minutes are determined by collecting all of the Available Seconds, removing any Severely Errored Seconds grouping the result in 60-second long groups and counting a 60-second long group (minute) as degraded if the cumulative errors during the seconds present in the group exceed 1E-6

This is defined in RFC 1406

This can happen when:

Resolutions

Below are some basic troubleshooting steps

  1. Look into other error counts to determine what is causing the errored minutes.

  2. 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.DS1E1
Parent MonitorSystem.Health.PerformanceState
CategoryPerformanceHealth
EnabledFalse
Alert GenerateTrue
Alert SeverityError
Alert PriorityNormal
Alert Auto ResolveFalse
Monitor TypeMicrosoft.SystemCenter.NetworkDevice.SnmpThresholdMonitorType
RemotableTrue
AccessibilityPublic
Alert Message
Degraded Minutes Exceed Threshold
The count of degraded minutes (DM) on this interface has exceeded the defined threshold for the last 15 minute interval
RunAsDefault

Source Code:

<UnitMonitor ID="Microsoft.SystemCenter.NetworkDevice.Interface.DS1E1.DMThresholdMonitor" Accessibility="Public" Enabled="false" Target="Microsoft.SystemCenter.NetworkDevice.Interface.DS1E1" ParentMonitorID="Health!System.Health.PerformanceState" Remotable="true" Priority="Normal" TypeID="Microsoft.SystemCenter.NetworkDevice.SnmpThresholdMonitorType" ConfirmDelivery="false">

  <Category>PerformanceHealth</Category>

  <AlertSettings AlertMessage="Microsoft.SystemCenter.NetworkDevice.Interface.DS1E1.DMThresholdMonitor.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>1.3.6.1.2.1.10.18.8.1.11.$Target/Property[Type="Microsoft.SystemCenter.NetworkDevice.Interface"]/ifIndex$.1</OID>

        <Syntax>2</Syntax>

        <Value VariantType="3"/>

      </SnmpVarBind>

    </SnmpVarBinds>

    <Threshold>0</Threshold>

  </Configuration>

</UnitMonitor>