Which LED indicates that the supervisor engine is running self-diagnostics?

The Power Management LED serves as an indicator that the supervisor engine is engaged in self-diagnostic procedures. This LED typically provides insights into the operational health of the device, specifically during the boot-up sequence when the supervisor engine is tasked with checking its own functionality and performance before fully taking on its roles in network management. The presence of this diagnostic activity helps to ensure that any critical issues are identified early, allowing for troubleshooting prior to full operational status.

In networking equipment, LEDs are integral to monitoring the health and status of various components, and recognizing what each LED signifies is crucial for effective maintenance and troubleshooting. The Power Management LED's specific function in signaling self-diagnostic processes is pivotal for system integrity during the initial setup phase.