Hello,

You can create Hyper-V VMSwitches very easely with Powershell since Hyper-V 2012 :

New-VMSwitch -NetAdapterName "Ethernet" -Name vEthExternal -AllowManagementOS $true
New-VMSwitch -Name 'vPrivate' -SwitchType Private
New-VMSwitch -Name 'vInternal' -SwitchType Internal

Hint : The first NIC of a computer is allways named “Ethernet”.

You can check the result with :

Get-VMSwitch