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SRM's avatar
SRM
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Oct 23, 2025
Solved

SFP Port LEDs Blinking Yellow

Hi I upgraded the F5 OS to version 1.8 and the tenant software to 17.5.1.3. The upgrade went smoothly and both the Active and Standby devices successfully handled traffic after the upgrade.

However I have noticed that the SFP port LEDs on both the Primary and Secondary devices are blinking yellow. Both devices appear to be operating normally but I would like to confirm whether this is expected behavior Could the yellow blinking indicate a speed mismatch or should the LEDs be green under normal conditions

 

 

2 Replies

  • Hi SRM,

    It is normal for the yellow light to be on at the 25/10G ports for r5k/10k series devices.

    State

    Module

    Description

    off (not lit)

    QSFP+ or QSFP28

    No link.

    blue solid

    QSFP28

    Linked at 100GbE (with all four LEDs operating in unison).

    blue blinking

    QSFP28

    Link is actively transmitting or receiving data at 100GbE (with all four LEDs operating in unison).

    green solid

    QSFP+

    Linked at 40GbE when operating as a single 40GbE port (with all four LEDs operating in unison).

    green blinking

    QSFP+

    Link is actively transmitting or receiving data at 40GbE (with all four LEDs operating in unison).

    amber/yellow solid

    QSFP28

    Linked at 25GbE when operating as a single 4x 25GbE ports.

    amber/yellow solid

    QSFP+

    Linked at 10GbE when operating as a single 4x 10GbE ports.

    amber/yellow blinking

    QSFP28

    Link is actively transmitting or receiving data at 25GbE.

    amber/yellow blinking

    QSFP+

    Link is actively transmitting or receiving data at 10GbE.

    REF: https://techdocs.f5.com/en-us/hardware/platform-guide-r5000r10000-series/title--platform-overview.html

  • SRM's avatar
    SRM
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    Thanks Enes. I appreciated the response.