This read-write integer enables, disables, or shows not-applicable for Energy Efficient Ethernet (EEE) on a port, the IEEE 802.3az mechanism that lets a link drop into a low-power idle state during traffic gaps. An admin turns it on to reduce power draw on ports with intermittent traffic, and the switch returns failure if not-applicable(2) is explicitly set on unsupported hardware. For example, enabling EEE on a desktop-facing 1000BASE-T port can reduce its power draw during idle periods between bursts of traffic.