Cisco Catalyst 9200 Series Hardware Installation Manual page 125

Switch LEDs
Color
Blinking green
Blinking amber
Amber
Network Module Link Status
Activity on a link; no faults.
Note The LED will blink green even when there is very little control traffic.
Link is off due to a fault or because it has exceeded a limit set in the switch software.
Caution Link faults occur when non-compliant cabling is connected to an SFP/SFP+
port. Use only standard-compliant cabling to connect to Cisco SFP/SFP+ ports.
You must remove from the network any cable or device that causes a link fault.
Link for the SFP/SFP+/SFP28/QSFP+ has been disabled.
Cisco Catalyst 9200 Series Switches Hardware Installation Guide
Switch LEDs
117