Request: list active pNIC(s) for a guest

If there's a way to do this, I can't see it, but I'd be very, very happy if someone else had a solution for this...

In short, I'm trying to see which pNIC is currently being used by a given VM on a vSwitch at a specific time, assuming vSwitch port ID load balancing for the guests.

(If you want to see this, look at the "TEAM-PNIC" column in (r)esxtop on the network page)

I've had a good play with the output of Get-VirtualSwitch for a VM:

   $switch = $VM | Get-VirtualSwitch
   write $VM.Name
   write $switch.NIC

But this just tells me *all* available NICs, not the one in use.

Any magic thoughts?

Thanks,

Daern

ps. Excellent and very useful site :-)