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[EX] How to verify if the Energy Efficient Ethernet (EEE) feature is working

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Article ID: KB26258 KB Last Updated: 03 Aug 2020Version: 5.0
Summary:

This article provides information on how to verify if the Energy Efficient Ethernet feature is working.

Symptoms:

Energy Efficient Ethernet (EEE) is commonly known as IEEE 802.3az and it will help to reduce the power consumption on the copper interface.

Solution:

Certain EX devices support the Energy Efficient Ethernet (EEE) feature from 12.2R1 and it will be available, if the link partner supports EEE. EEE provides LPI (Low Power Idle), which is a method to reduce the power consumption.

When the EEE enabled link is idle, LPI will be enabled to reduce power consumption. LPI indication is exchanged on the physical layer to signal the transition to low power mode.

The following example illustrates how to verify if this feature is working properly:

Topology:

                ge-8/0/0     ge-0/0/47
         EX6200------------------------EX3300
  1. To enable EEE, the following configuration is required on both of the devices:

    EX6200:
    set interfaces ge-8/0/0 ether-options ieee-802-3az-eee
    EX3300:
    set interfaces ge-0/0/47 ether-options ieee-802-3az-eee
  2. Verify the LPI status, when there is no traffic on the EEE enabled port:
    lab@EX6200# run show interfaces ge-8/0/0 extensive | match 802.3az
      IEEE 802.3az Energy Efficient Ethernet: Enabled, RX LPI, TX LPI < 
    lab@EX3300# run show interfaces ge-0/0/47 extensive | match 802.3az
      IEEE 802.3az Energy Efficient Ethernet: Enabled, RX LPI, TX LPI <
    The above output indicates LPI is enabled on both of the devices as there is no traffic.

  3. When the EEE enabled link detects unidirectional traffic, LPI will be enabled only on the idle side of the interface:
    lab@EX6200# run show interfaces ge-8/0/0 extensive | match 802.3az
      IEEE 802.3az Energy Efficient Ethernet: Enabled, RX LPI <
    lab@EX3300# run show interfaces ge-0/0/47 extensive | match 802.3az
      IEEE 802.3az Energy Efficient Ethernet: Enabled, TX LPI <
    The above output indicates that LPI is enabled on the RX side of EX6200 and TX side of EX3300, as EX6200 has sent traffic to EX3300.

  4. When the EEE enabled link detects bidirectional traffic, LPI will be disabled on both of the devices:
    lab@EX6200# run show interfaces ge-8/0/0 extensive | match 802.3az
      IEEE 802.3az Energy Efficient Ethernet: Enabled, NO LPI <
    lab@EX3300# run show interfaces ge-0/0/47 extensive | match 802.3az
      IEEE 802.3az Energy Efficient Ethernet: Enabled, NO LPI <

  5. You can check the power consumption on the EX6200 and EX8200 devices, as shown below:
    lab@EX6200> show chassis power-budget-statistics
                PSU  0     (EX6200-PWR-AC2500)                 :    2500 W   Online
                PSU  1     (EX6200-PWR-AC2500)                 :    2500 W   Online
                Total Power supplied by all Online PSUs  :    5000 W
                Power Redundancy Configuration           :     N+1
                Power Reserved for the Chassis           :     500 W
        Fan Tray Statistics                       Base power   Power Used
        FTC  0   (EX6210-FAN)                    :     300 W      22.87 W
        FPC Statistics                            Base power   Power Used   PoE power   Priority
        FPC  4   (EX6200-SRE64-4XS)              :     100 W      49.04 W          0 W       0
        FPC  5   (EX6200-SRE64-4XS)              :     100 W      46.86 W          0 W       0
        FPC  8   (EX6200-48P)                    :     220 W      42.38 W       1440 W       9  <
        FPC  9   (EX6200-48P)                    :     220 W      44.83 W       1440 W       9  <
    
        Total (non-PoE) Power allocated          :     940 W
                Total Power allocated for PoE            :    2880 W
                Power Available (Redundant case)         :    1560 W
    
    Power Used indicates the amount of power that is consumed by the line card. Based on the comparison between with or without EEE, you can obtain the amount of power being saved by EEE.
Modification History:
2020-08-03: Added pathfinder link for supported devices and JUNOS

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