On my Windows 2012 R2 HyperV Cluster, The event 16945 was getting logged frequently.
The current setup has two network interfaces teamed and this teamed interface is used for creating the Virtual Switch. The virtual switch, the teamed inteface and one of the team member are having the same MAC Address which is the base of this event.
In my observation, This event will go off if we unchecked the option “Allow management operating system to share this network adapter” from Virtual Switch Manager. By doing so will remove the virtual interface – vEthernet and have the configuration directly on Virtual Switch.
Its recommended to have dedicated interfaces for Management, HyperV Data, LiveMigrationa and CSV. If you have a dedicated interface for Management, this you can go ahead with this option.