| Event Id | 21201 |
| Source | Microsoft-Windows-Hyper-V-High-Availability |
| Description | The virtual network switch '%1' was not found. |
| Event Information | According to Microsoft : Cause : This event is logged when the virtual network switch was not found. Resolution : Check virtual network switch Ensure that there is a virtual network switch with the same name on the target machine. To check the virtual switch names using the Hyper-v Manager: 1. Open theHyper-V Manager 2. Click the target machine in list of machines. 3.ClickVirtual Network Manager in the Actions menu. To check virtual switch names using PowerShell, run the following PowerShell script: $HyperV = "HyperV Name"$NameSpace = "Root\Virtualization"get-wmiobject -Name $NameSpace -Com $HyperV -Class Msvm_InternalEthernetPort | Select DeviceID,ElementName,MaxDataSizeget-wmiobject -Name $NameSpace -Com $HyperV -Class Msvm_ExternalEthernetPort | Select DeviceID,ElementName,MaxDataSize,IsBoundget-wmiobject -Name $NameSpace -Com $HyperV -Class Msvm_SyntheticEthernetPort | Select DeviceID,ElementName,MaxDataSize$VSwitch = get-wmiobject -Name $NameSpace -Com $HyperV -Class Msvm_VirtualSwitch $VSwitch | Select Name,ElementName,Ports Verify : All the clustered resources are in a healthy state and failover operations are completing successfully. |
| Reference Links | Event ID 21201 from Source Microsoft-Windows-Hyper-V-High-Availability |
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