Configuring EEE

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 disabled by default.

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.

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 ActionPurpose
    Step 1configure terminal


    Example: 
    
Device# configure terminal
     

    Enters global configuration mode.

     
    Step 2interface interface-id


    Example: 
    
Device(config)# interface gigabitethernet1/0/1
     

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

     
    Step 3power efficient-ethernet auto


    Example: 
    
Device(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 4no power efficient-ethernet auto


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


    Example: 
    
Device(config-if)# end
     

    Returns to privileged EXEC mode.

     
    Step 6copy running-config startup-config


    Example: 
    
Device# 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 gigabitEthernet 2/0/1
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 gigabitEthernet 2/0/1
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 gigabitEthernet 2/0/1

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

    Configuration Examples for Configuring EEE

    This example shows how to enable EEE for an interface:

    Device# configure terminal
Device(config)# interface gigabitethernet1/0/1
Device(config-if)# power efficient-ethernet auto

    This example shows how to disable EEE for an interface:

    Device# configure terminal
Device(config)# interface gigabitethernet1/0/1
Device(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 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 XE 3.2SE

    This feature was introduced.