Вот тут говорят о невозможности использовать beaconing в случае когда две сетевухи смотрят в один физ.свитч.
- Don’t use Beacon Probing if more than one pNIC in the vSwitch is connected to the same pSwitch. This could result in the same MAC address being presented on two or more ports on the pSwitch which is “a very bad thing”.
The Great vSwitch Debate – Part 4 | Ken's Virtual Reality