BIG-IP hardware platforms use chassis LEDs to indicate system health states.
A solid yellow status LED typically indicates a warning condition , such as:
A non-critical hardware alert
A temperature threshold nearing limit
A minor fan or sensor irregularity
Other non-fatal environmental or system conditions
This state reflects a warning-level alarm , meaning the unit is operational but requires investigation.
Why the other options are incorrect
A. Halted or EUD mode
This is associated with different LED patterns (usually flashing conditions or specific color codes), not a solid yellow status LED.
B. Standby in device group
HA state is not indicated by the chassis status LED.
Standby status is a logical device state, not a hardware LED state.
D. Power supply failure
Power supply indicators use separate LEDs located on each power module (usually flashing amber/red), not the system status LED.
Thus, a solid yellow status indicator signifies a warning-level alarm .
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