Specifications

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Catalyst 4500 Se ries S wit ch C is co IO S C om mand R efer ence —Re lease I OS XE 3 .3.0 XO(1 5.1 (1)XO)
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Chapter 2 Cisco IOS Commands for the Catalyst 4500 Series Switches
power efficient-ethe rnet auto
power efficie nt-ethernet a uto
To enable EEE, use the power efficient-ethernet auto command. To disable EEE, use the no form of
this command.
power efficient-ethernet auto
no power efficient-ethernet auto
Syntax Description This command has no arguments or keywords.
Defaults EEE is di sabled
Command Modes Global configura tion mode
Usage Guidelines EEE is supported on WS-X4748-UPOE +E and WS-X4748-RJ45- E.
EEE defines support f or physical layer de vices (PHY s) to oper ate in Low Power Idl e (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 (ei ther auto or forced mode) does not re quire 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