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play_arrow Configuring Interfaces
play_arrow Port Speed for Switches
play_arrow Configuring Aggregated Ethernet Interfaces
- Aggregated Ethernet Interfaces
- Load Balancing for Aggregated Ethernet Interfaces
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- Flexible Ethernet Services Encapsulation
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- Monitoring Interfaces
- Troubleshooting Interfaces
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- Common Output Fields Description
- Junos CLI Reference Overview

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Energy Efficient Ethernet Interfaces

date_range 20-Dec-24

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The energy efficient ethernet (EEE) helps in reducing the power consumption on physical layer devices. Configuring these EEE on interfaces includes enabling EEE on Base-T copper ethernet port based on the power utilization and also verifying if EEE is saving energy on the configured ports.

Reduce Power Consumption on Interfaces using Energy Efficient Ethernet

Energy Efficient Ethernet (EEE), an Institute of Electrical and Electronics Engineers (IEEE) 802.3az standard, reduces the power consumption of physical layer devices (PHYs) during periods of low link utilization. EEE saves energy by switching part of the transmission circuit into low power mode when the link is idle.

An Ethernet link consumes power even when a link is idle. EEE provides a method to utilize power in such a way that Ethernet links use power only during data transmission. EEE uses a signaling protocol, Low Power Idle (LPI) for achieving the power saving when an Ethernet link is idle. EEE allows PHYs to exchange LPI indications to signal the transition to low power mode when there is no traffic. LPI indicates when a link can go idle and when the link needs to resume after a predefined delay without impacting data transmission.

The following copper PHYs are standardized by IEEE 802.3az:

100BASE-T
1000BASE-T
10GBASE-T

Configure Energy Efficient Ethernet on Interfaces

Configure EEE only on EEE-capable Base-T copper Ethernet ports. If you configure EEE on unsupported ports, the console displays the message: “EEE not supported”.

This topic describes:

Enable EEE on an EEE-Capable Base-T Copper Ethernet Port
Disable EEE on a Base-T Copper Ethernet Port

Enable EEE on an EEE-Capable Base-T Copper Ethernet Port

To enable EEE on an EEE-capable Base-T copper Ethernet interface:

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 user@switch# set interfaces interface-name  ether-options ieee-802-3az-eee

You can view the EEE status by using the show interfaces interface-name detail command.

Disable EEE on a Base-T Copper Ethernet Port

To disable EEE on a Base-T copper Ethernet interface:

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 user@switch# delete interfaces interface-name  ether-options ieee-802-3az-eee

By default, EEE is disabled on EEE-capable ports.

Purpose

Verify that enabling EEE saves energy on Base-T Copper Ethernet ports.

Action

You can see the amount of energy that is saved by EEE on an EX Series Switches using the show chassis power-budget-statistics command.

View the power budget of an EX Series Switches before enabling EEE.

On an EX6210 switch:

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user@switch>show chassis power-budget-statistics
     PSU  2     (EX6200-PWR-AC2500)                 :    2500 W   Online
            PSU  3                 )                 :       0 W  Offline
            Total Power supplied by all Online PSUs  :    2500 W
            Power Redundancy Configuration           :     N+1
            Power Reserved for the Chassis           :     500 W
    Fan Tray Statistics                       Base power   Power Used
    FTC  0                                   :     300 W        nan W
    FPC Statistics                            Base power   Power Used   PoE power   Priority
    FPC  3   (EX6200-48T)                    :     150 W      61.54 W          0 W       9
    FPC  4   (EX6200-SRE64-4XS)              :     100 W      48.25 W          0 W       0
    FPC  5   (EX6200-SRE64-4XS)              :     100 W      48.00 W          0 W       0
    FPC  7   (EX6200-48T)                    :     150 W      63.11 W          0 W       9
    FPC  8   (EX6200-48T)                    :     150 W      12.17 W          0 W       9

    Total (non-PoE) Power allocated          :     950 W
            Total Power allocated for PoE            :       0 W
            Power Available (Redundant case)         :       0 W
            Total Power Available                    :    1550 W

On an EX4300 switch:

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user@switch>show chassis power-budget-statistics fpc 1
     PSU  1    (JPSU-1100-AC-AFO-A)          :    1100 W   Online
            Power redundancy configuration           :    N+0
            Total power supplied by all online PSUs  :    1100 W
            Base power reserved                      :    175 W
            Non-PoE power being consumed             :    95 W
            Total Power allocated for PoE            :    925 W
            Total PoE power consumed                 :    0 W
            Total PoE power remaining                :    925 W

Enable EEE on Base-T Copper Ethernet ports and save the configuration.

View the power budget of the switch after enabling EEE.

On an EX6210 switch:

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user@switch> show chassis power-budget-statistics
     PSU  2     (EX6200-PWR-AC2500)                 :    2500 W   Online
            PSU  3                 )                 :       0 W  Offline
            Total Power supplied by all Online PSUs  :    2500 W
            Power Redundancy Configuration           :     N+1
            Power Reserved for the Chassis           :     500 W
    Fan Tray Statistics                       Base power   Power Used
    FTC  0                                   :     300 W        nan W
    FPC Statistics                            Base power   Power Used   PoE power   Priority
    FPC  3   (EX6200-48T)                    :     150 W      50.36 W          0 W       9
    FPC  4   (EX6200-SRE64-4XS)              :     100 W      48.60 W          0 W       0
    FPC  5   (EX6200-SRE64-4XS)              :     100 W      48.09 W          0 W       0
    FPC  7   (EX6200-48T)                    :     150 W      51.38 W          0 W       9
    FPC  8   (EX6200-48T)                    :     150 W      12.17 W          0 W       9

    Total (non-PoE) Power allocated          :     950 W
            Total Power allocated for PoE            :       0 W
            Power Available (Redundant case)         :       0 W
            Total Power Available                    :    1550 W

On an EX4300 switch:

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user@switch> show chassis power-budget-statistics fpc 1
     PSU  1    (JPSU-1100-AC-AFO-A)          :    1100 W   Online
            Power redundancy configuration           :    N+0
            Total power supplied by all online PSUs  :    1100 W
            Base power reserved                      :    175 W
            Non-PoE power being consumed             :    86 W
            Total Power allocated for PoE            :    925 W
            Total PoE power consumed                 :    0 W
            Total PoE power remaining                :    925 W

See show interfaces extensive for EEE-enabled status of the interface for Low Power Idle (LPI).

Meaning

On an EX6210 switch, the Power Used field in the output shows the actual power being consumed by the line card or SRE module, including PoE power. If you compare the values in the Power Used field before and after enabling EEE for FPC 3 and FPC 7, you notice the saved power when you enable EEE.

Note:

Only for EX6210 switches, the output displays the Power Used field.

On an EX4300 switch, if you compare the values in the Non-PoE power being consumed field before and after enabling EEE, you notice the saved power when you enable EEE.

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