Cisco Catalyst 9200 Series

Network Module Link StatusColor
Activity on a link; no faults.
The LED will blink green even when there is very little control traffic.
Note
Blinking green
Link is off due to a fault or because it has exceeded a limit set in the switch software.
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.
Caution
Blinking amber
Link for the SFP/SFP+/SFP28/QSFP+ has been disabled.Amber
Cisco Catalyst 9200 Series Switches Hardware Installation Guide
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Switch LEDs
Switch LEDs