auto_negotiate
Description:
When true, enforce auto-negotiation of speed and duplex mode.
If "speed" and "duplex" properties are both specified, only that single mode will be advertised and accepted during the link auto-negotiation process: this works only for BASE-T 802.3 specifications and is useful for enforcing gigabits modes, as in these cases link negotiation is mandatory. When false, "speed" and "duplex" properties should be both set or link configuration will be skipped.