Configuring EEE

Restrictions for EEE

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.

Information About EEE

EEE Overview

Energy Efficient Ethernet (EEE) is an IEEE 802.3az standard that is designed to reduce power consumption in Ethernet networks during idle periods.

EEE can be enabled on devices that support low power idle (LPI) mode. Such devices can save power by entering LPI mode during periods of low utilization. In LPI mode, systems on both ends of the link can save power by shutting down certain services. EEE provides the protocol needed to transition into and out of LPI mode in a way that is transparent to upper layer protocols and applications.

Default EEE Configuration

EEE is enabled by default.

How to Configure EEE

You can enable or disable EEE on an interface that is connected to an EEE-capable link partner.

Enabling or Disabling EEE

Procedure

  Command or Action Purpose
Step 1

configure terminal

Example:


Switch# configure terminal

Enters global configuration mode.
Step 2

interface interface-id

Example:


Switch(config)# interface gigabitethernet 1/0/1

Specifies the interface to be configured, and enter interface configuration mode.
Step 3

power efficient-ethernet auto

Example:


Switch(config-if)# power efficient-ethernet auto

Enables EEE on the specified interface. When EEE is enabled, the device advertises and autonegotiates EEE to its link partner.
Step 4

no power efficient-ethernet auto

Example:


Switch(config-if)# no power efficient-ethernet auto
Disables EEE on the specified interface.
Step 5

end

Example:


Switch(config-if)# end

Returns to privileged EXEC mode.
Step 6

copy running-config startup-config

Example:


Switch# copy running-config startup-config

(Optional) Saves your entries in the configuration file.

Monitoring EEE

Table 1. Commands for Displaying EEE Settings

Command

Purpose

show eee capabilities interface interface-id

Displays EEE capabilities for the specified interface.

show eee status interface interface-id

Displays EEE status information for the specified interface.

show eee counters interface interface-id

Displays EEE counters for the specified interface.

Following are examples of the show eee commands 

Switch#show eee capabilities interface gigabitEthernet2/0/1
Gi2/0/1
EEE(efficient-ethernet): yes (100-Tx and 1000T auto)
Link Partner : yes (100-Tx and 1000T auto)

ASIC/Interface : EEE Capable/EEE Enabled
Switch#show eee status interface gigabitEthernet2/0/1
Gi2/0/1 is up
EEE(efficient-ethernet): Operational
Rx LPI Status : Low Power
Tx LPI Status : Low Power
Wake Error Count : 0

ASIC EEE STATUS
Rx LPI Status : Receiving LPI
Tx LPI Status : Transmitting LPI
Link Fault Status : Link Up
Sync Status : Code group synchronization with data stream intact
Switch#show eee counters interface gigabitEthernet2/0/1

LP Active Tx Time (10us) : 66649648
LP Transitioning Tx : 462
LP Active Rx Time (10us) : 64911682
LP Transitioning Rx : 153

Examples for Cataylst Digital Building Series Switches

Switch#show eee capabilities interface gig1/0/1
Gi1/0/1
EEE(efficient-ethernet): yes (100-Tx and 1000T auto)
Link Partner : no

Switch#show eee status int gig1/0/1
Gi1/0/1 is up
EEE(efficient-ethernet): Disagreed
Rx LPI Status : None
Tx LPI Status : None
Wake Error Count : 0

Configuration Examples for Configuring EEE

This example shows how to enable EEE for an interface:


Switch# configure terminal
Switch(config)# interface gigabitethernet 1/0/1
Switch(config-if)# power efficient-ethernet auto

This example shows how to disable EEE for an interface:


Switch# configure terminal
Switch(config)# interface gigabitethernet 1/0/1
Switch(config-if)# no power efficient-ethernet auto

Additional References

Error Message Decoder

Description Link

To help you research and resolve system error messages in this release, use the Error Message Decoder tool.

https://www.cisco.com/cgi-bin/Support/Errordecoder/index.cgi

MIBs

MIB MIBs Link

All the supported MIBs for this release.

To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL:

http://www.cisco.com/go/mibs

Technical Assistance

Description Link

The Cisco Support website provides extensive online resources, including documentation and tools for troubleshooting and resolving technical issues with Cisco products and technologies.

To receive security and technical information about your products, you can subscribe to various services, such as the Product Alert Tool (accessed from Field Notices), the Cisco Technical Services Newsletter, and Really Simple Syndication (RSS) Feeds.

Access to most tools on the Cisco Support website requires a Cisco.com user ID and password.

http://www.cisco.com/support

Feature History and Information for Configuring EEE

Release

Modification

Cisco IOS Release 15.0(2)EX1

This feature was introduced.