Interface and Hardware Component Configuration Guide, Cisco IOS XE Release 3SE (Catalyst 3850 Switches)
Configuring Internal Power Supplies
Downloads: This chapterpdf (PDF - 1.28 MB) The complete bookPDF (PDF - 3.18 MB) | The complete bookePub (ePub - 449.0 KB) | Feedback

Configuring Internal Power Supplies

Configuring Internal Power Supplies

Information About Internal Power Supplies

See the switch installation guide for information about the power supplies.

How to Configure Internal Power Supplies

Configuring Internal Power Supply

You can use the power supply EXEC command to configure and manage the internal power supply on the switch. The switch does not support the no power supply EXEC command.

Follow these steps beginning in user EXEC mode:


    1.    power supply switch_number slot{A | B} { off | on }

    2.    show environment power

     Command or ActionPurpose
    Step 1 power supply switch_number slot{A | B} { off | on }

    Switch# power supply 1 slot A on 

    Sets the specified power supply to off or on by using one of these keywords:

    • A —Selects the power supply in slot A.

    • B —Selects power supply in slot B.


      Power supply slot B is the closest to the outer edge of the switch.

    • off —Set the power supply off.

    • on —Set the power supply on.

    By default, the switch power supply is on.

    Step 2show environment power

    Switch# show environment power

    Verifies your settings.


    Monitoring Internal Power Supplies

    Table 1 Show Commands for Power Supplies



    show environment power [ all | switch switch_number ]

    (Optional) Displays the status of the internal power supplies for each switch in the stack or for the specified switch. The range is 1 to 9, depending on the switch member numbers in the stack.

    Configuration Examples for Internal Power Supplies

    This example shows how to set the power supply in slot A to off:

    Switch# power supply 1 slot A off
    Disabling Power supply A may result in a power loss to PoE devices and/or switches ... Continue? (yes/[no]): yes 
    Jun 10 04:52:54.389: %PLATFORM_ENV-6-FRU_PS_OIR: FRU Power Supply 1 powered off 
    Jun 10 04:52:56.717: %PLATFORM_ENV-1-FAN_NOT_PRESENT: Fan is not present

    This example shows how to set the power supply in slot A to on:

    Switch# power supply 1 slot A on
    Jun 10 04:54:39.600: %PLATFORM_ENV-6-FRU_PS_OIR: FRU Power Supply 1 powered on 

    This example shows the output of the show env power command:

    Switch# show env power
    SW  PID                 Serial#     Status           Sys Pwr  PoE Pwr  Watts
    --- ------------------  ----------  ---------------  -------  -------  -----
    1A  PWR-C1-715WAC       LIT161010UE  OK              Good     Good     715
    1B  Not Present
    Table 2 show env power Status Descriptions
    Field Description


    The power supply is present and power is good.

    Not Present

    No power supply is installed.

    No Input Power

    The power supply is present but there is no input power.


    The power supply and input power are present, but power supply is switched off by CLI.

    Not Responding

    The power supply is not recognizable or is faulty.


    The power supply fan is faulty.

    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.



    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:


    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 user ID and password.


    Feature History and Information for Internal Power Supplies



    Cisco IOS XE 3.2SE

    This feature was introduced.

    Cisco IOS XE 3.3SE

    The slot keyword replaced the frufep keyword.