Forum Discussion

Altocumulus

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 ...

SRM
Oct 23, 2025
Thanks Enes. I appreciated the response.

Enes_Afsin_Al

MVP

Oct 23, 2025

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.