Jumbo frames allow ESX to send larger frames out onto the physical network. The network must support jumbo frames end-to-end.

Jumbo frames up to 9kB (9000 bytes) are supported.

Jumbo frames must be enabled for each vSwitch or VMkernel interface through the command-line interface on your ESX host. Before enabling jumbo frames, check with your hardware vendor to ensure that your physical network adapter supports jumbo frames.