Quiz Entry - updated: 2026.07.14
In STAT (Port Status) mode on a Cisco switch, what do the different port LED colors indicate?
Off = no link, green = link up, blinking green = activity, amber = blocked by STP (Spanning Tree Protocol).
| LED State | STAT Mode Meaning |
|---|---|
| Off | No link or port is shutdown |
| Solid Green | Link is up |
| Blinking Green | Port is actively sending/receiving data |
| Amber | Port is blocked by STP (preventing a loop) |
| Blinking Amber | Port is blocked by STP (preventing a loop) |
| Alternating Green/Amber | Link fault detected |
This is the default mode — STAT is selected when the STAT LED is green. Understanding these colors is essential for quick physical troubleshooting without CLI (Command-Line Interface) access.
Tip: Green = good, Amber = blocked/problem. If you see amber on a port, think Spanning Tree Protocol.