Restrictions for EEE
Energy Efficient Ethernet (EEE) has the following restrictions:
Changing the EEE configuration resets the interface because the device has to restart Layer 1 autonegotiation.
You might want to enable the Link Layer Discovery Protocol (LLDP) for devices that require longer wakeup times before they are able to accept data on their receive paths. Doing so enables the device to negotiate for extended system wakeup times from the transmitting link partner.
If a Multigigabit Ethernet port link is negotiated to 100 Mbps speeds, EEE will not initiate power-saving on the device.