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This chapter describes how to configure Energy Efficient Ethernet (EEE) on Cisco NX-OS devices.
Your software release might not support all the features documented in this module. For the latest caveats and feature information, see the Bug Search Tool at https://tools.cisco.com/bugsearch and the release notes for your software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the “New and Changed Information” chapter or the Feature History table.
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.
The EEE LPI sleep threshold specifies how long an interface should wait to go to sleep after detecting an idle state. You can configure the threshold to be aggressive or nonaggressive.
The EEE latency specifies the EEE delay that is added to your traffic. The default value is a constant latency of 6 microseconds.
By default, Cisco NX-OS places you in the default virtual device context (VDC) unless you specifically configure another VDC. For more information about VDCs, see the Cisco Nexus 7000 Series NX-OS Virtual Device Context Configuration Guide.
EEE has the following prerequisites:
To configure VDCs, you must install the appropriate license. See the Cisco Nexus 7000 Series NX-OS Virtual Device Context Configuration Guide for configuration information and the Cisco NX-OS Licensing Guide for licensing information.
Guidelines and Limitations:
Only F2e (enhanced) copper port modules support EEE. F2e fiber port modules do not support EEE
EEE is supported only for 10-Gigabit link speeds. It is not supported for 1-Gigabit link speeds.
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.
Lists the default settings for EEE parameters.
|
Parameters |
Default |
|
EEE |
Disabled |
|
EEE LPI sleep threshold |
Nonaggressive |
|
EEE latency |
6 microseconds |
This section includes the following topics:
Enabling or Disabling EEE
Configuring the EEE LPI Sleep Threshold
You can enable or disable EEE on an interface that is connected to an EEE-capable link partner.
Make sure that you are in the correct VDC. To change the VDC, use the switchto vdc command.
| Command or Action | Purpose | |
|---|---|---|
| Step 1 |
switch# configure terminal |
Places you in global configuration mode. |
| Step 2 |
switch(config)# interface ethernet slot/port |
Enters global configuration mode. |
| Step 3 |
switch(config-if)# [no] power efficient-ethernet auto |
Enables or disables EEE on the specified interface. When EEE is enabled, the device advertises and auto negotiates EEE to its link partner. |
| Step 4 |
(Optional) switch(config-if)# show interface ethernet slot/port |
(Optional)
Displays the EEE status on the interface. |
| Step 5 |
(Optional) switch(config)# copy running-config startup-config |
(Optional)
Saves the change persistently through reboots and restarts by copying the running configuration to the startup configuration. |
You can configure the EEE LPI sleep threshold on an interface to specify how aggressively you want it to go to sleep
Make sure that you are in the correct VDC. To change the VDC, use the switchto vdc command.
| Command or Action | Purpose | |
|---|---|---|
| Step 1 |
switch# configure terminal |
Places you in global configuration mode. |
| Step 2 |
switch(config)# interface ethernet slot/port |
Enters global configuration mode. |
| Step 3 |
switch(config-if)# [no] power efficient-ethernet sleep threshold aggressive |
Configures the EEE LPI sleep threshold on the interface to be aggressive or nonaggressive. The no form of this command enables the nonaggressive threshold.
|
| Step 4 |
(Optional) switch(config)# copy running-config startup-config |
(Optional)
Saves the change persistently through reboots and restarts by copying the running configuration to the startup configuration. |
To display the EEE configuration, perform one of the following tasks:
|
Command |
Purpose |
|
show environment power detail |
Displays the current power usage. |
|
show interface ethernet slot/port |
|
|
show interface ethernet slot/port capabilities |
Displays whether the interface is EEE capable. |
|
show interface ethernet slot/port counters detailed |
|
This example shows how to enable EEE on an Ethernet interface:
switch# config t
switch(config)# interface ethernet 7/1
switch(config-if)# power efficient-ethernet auto
switch(config-if)# power efficient-ethernet sleep threshold aggressive
switch(config-if)# show interface ethernet 7/1
Ethernet7/1 is up
EEE(efficient-ethernet): Operational|
Related Topic |
Document Title |
|
EEE CLI commands |
Cisco Nexus 7000 Series NX-OS System Management Command Reference |
|
VDCs |
Cisco Nexus 7000 Series NX-OS Virtual Device Context Configuration Guide |
Your software release might not support all the features in this document. For the latest caveats and feature information, see the Bug Search Tool at https://tools.cisco.com/bugsearch/ and the release notes for your software release.
|
Feature Name |
Releases |
Feature Information |
|
EEE |
6.1(2) |
This feature was introduced. |
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