To test this in a lab environment I have used a Cisco 3550 with 2x WS-G5483 installed and performed these steps on the switch:
conf t
int port-channel 1
int gi 0/1
channel-group 1 mode active
int gi 0/2
channel-group 1 mode active
^Z
copy run start
To configure the team using PowerShell (it is possible to do via the GUI too):
Run Get-NetAdapter to find the names of your NICs - in my case they were Ethernet and Ethernet 2 - then run:
New-NetLbfoTeam -Name "LAN Team" -TeamMembers ethernet,"ethernet 2" -TeamingMode lacp
The output will show the team status as down so wait a few seconds for the LACP negotiation to complete and run Get-NetLbfoteam. You can also run Get-NetLbfoTeamNic or Get-NetAdapter to confirm that the LinkSpeed in now 2GB.
Update: It should be noted that you require a properly configured switch to get LACP to work. If the switch is not configured correctly or it does not support LACP at all you will receive a "LACP negotiation failed" error message
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