NIC teaming can be used in virtual switches to improve reliability and performance.
You may be familiar with NIC teaming on a server where you have two NICs and give them both the same IP using a special driver to create a virtual NIC.
On ESX servers you can use NIC teaming also to take advantage of multiple physical NICs you have. The NIC teaming is however done at the virtual switch (vSwitch) level rather than in the VM itself. This way everything using that vSwitch benefits.

This is done the following way:
1. Click on the ESX or ESXi Server within VI client.
2. Click on the Configuration tab and got to the networking section.
3. Go to the vSwitch you want to load balance on (eg. vSwitch0) and click Properties.

4. In the dialog that opens click vSwitch and choose edit.
5 Go to the NIC Teaming tab.
6. You will see Active, Standby and Unused adaptors. Change this as required, ensuring you have the physical network setup correctly.

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