Frequent node convergence Monitor

  • ID:  Microsoft.Windows.NetworkLoadBalancing.6.2.FrequentConvergence.Monitor
  • Description:  This monitor looks at convergence events logged by NLB and will change state if the current NLB node is converging frequently. You can control the number of convergences and the time interval settings used by this monitor using overrides.
  • Target:  Windows Server 2012 NLB Server Role
  • Enabled:  On Essential Monitoring

Operational States

Name State Description
Frequent Convergence Detected Warning  
Healthy Success  

Overridable Parameters

Parameter Name Default Value Description Override
Time window in seconds 60  
Number of occurrences 10  

Alert Details

Monitor State Message Priority Severity Auto Resolution
Frequent Convergence Detected (Warning) NLB node converging frequently Medium Warning Yes

Run As Profiles

Name
Default

Monitor Knowledgebase

Summary

The NLB node is converging frequently. While the cluster is converging clients may experience connectivity problems to the load balanced application. This could be indicative of a problem with a network device connecting the NLB nodes.

Causes

The frequent convergence can occur due to the following reasons:

  • A bad network adapter, cable or switch port may be preventing reliable heartbeat communication between NLB hosts.

  • Mismatched duplex settings on the network adapter and switch may be causing unreliable heartbeat communication.

  • The switch, network adapter or protocol stack is dropping packets due to insufficient resources.

Resolutions

To check for occurrences of configuration problems with NLB, you can use the Active Alerts view. It is also recommended to consult the network adapter and network device documentation.

External References
This monitor does not contain any external references.

See Also for Windows Server Network Load Balancing Management Pack


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