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VMware vRealize Operations Manager counters report false dropped packets on vSphere Distributed Switches with the alert: One or more ports are experiencing network contention (2105109)

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  • vRealize Operations Manager (formerly known as vCenter Operations Manager) counters show dropped packets on vSphere Distributed Switches (VDS) with the alert:

    One or more ports are experiencing network contention

  • No dropped packets are logged within vCenter Server or directly on an ESXi host.


This issue occurs because the vRealize Operations Manager counters identify only dropped packets and are unable to determine if the network drops are a part of normal network behavior or indicative of a problem. This can falsely trigger an alert.


This is a known issue affecting VMware vRealize Operations Manager 6.0.

This issue is resolved in vRealize Operations Manager 6.0.1, available at VMware Downloads.

Note: You must carry out a fresh install rather than an upgrade to resolve this issue. If you perform an upgrade, this work around is required.

To work around this issue when you are unable to upgrade, disable the dropped packet alert for the DVPortGroup.

To disable the dropped packet alert:

  1. Navigate to Administration and select Policies.
  2. Click Policy Library.
  3. Select the active policy.
  4. Edit the selected active policy.
  5. Click Alert / Symptom Definitions in the Edit Monitoring Policy window.
  6. Enter Port is experiencing dropped packets in the filter field under the Symptom Definitions section.
  7. Change the State value to Local disabled (noted by a preceding red circle with a diagonal line through it).
  8. Click Save.
  9. Repeat steps 3 to 7 for any other polices that are active.

Note: For the change to be retained in the policy, it may be necessary to disable the Alert Definition of the same name as the Symptom Definition.

Additional Information

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See Also

Update History

08/04/2015 - Added a note that a fresh install is required rather than an upgrade, to resolve the issue.

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