Power Efficient-Ethernet Auto - Cisco Catalyst 4500 Series Command Reference Manual

Chapter 2 Cisco IOS Commands for the Catalyst 4500 Series Switches

power efficient-ethernet auto

To enable EEE, use the power efficient-ethernet auto command. To disable EEE, use the no form of
this command.
Syntax Description
This command has no arguments or keywords.
Defaults EEE is disabled
Command Modes Global configuration mode
Command History Release
Release IOS XE
3.4.0SG and IOS
15.1(2)SG
Usage Guidelines
EEE is supported on WS-X4748-UPOE+E and WS-X4748-RJ45-E.
EEE defines support for physical layer devices (PHYs) to operate in Low Power Idle (LPI) mode. When
enabled, EEE supports QUIET times during low link utilization allowing both sides of a link to disable
portions of each PHY's operating circuitry and save power. This functionality is provided per port and
is not enabled by default. To avoid issues with EEE functionality on any port during run-time, Cisco
provides the power efficient-ethernet auto command to enable or disable EEE.
Because EEE relies on Auto Negotiation pulse to determine whether to activate EEE, the port must
initially enable auto negotiation. Furthermore, EEE is the correct action provided the speed is auto
100M, auto 1000M, or auto 100M and 1000M. 10M (either auto or forced mode) does not require EEE
for power saving.
Examples
This example shows how to enable EEE:
Switch# config t
Switch(config)# interface gigabitethernet 1/1
Switch(config-if)# power efficient-ethernet auto
Switch(config-if)# exit
OL-27596 -01
power efficient-ethernet auto
no power efficient-ethernet auto
Modification
Support for this command was introduced on the Catalyst 4500 series switch.
Catalyst 4500 Series Switch Cisco IOS Command Reference—Release IOS XE 3.4.0SG and IOS 15.1(2)SG)
power efficient-ethernet auto
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