Table 13: Meaning of Switch LED Colors in Different Modes
MeaningPort LED ColorPort Mode
No link, or port was administratively shut down.OffSTAT (port status)
Link present, no activity.Green
Activity. Port is sending or receiving data.Blinking green
Link fault. Error frames can affect connectivity, and errors
such as excessive collisions, CRC errors, and alignment
and jabber errors are monitored for a link-fault indication.
Alternating green-amber
Port is blocked by Spanning Tree Protocol (STP) and is
not forwarding data.
After a port is reconfigured, the port LED can be amber
for up to 30 seconds as STP checks the switch for possible
loops.
Amber
Port is blocked by STP and is only receiving control
frames.
Blinking amber
10/100/1000/SFP portsSPEED
Port is operating at 10 Mb/s.Off
Port is operating at 100 Mb/s.Green
Port is operating at 1000 Mb/s.Single green flash (on for
100 ms, off for 1900 ms)
Port is operating at 2500, 5000 or 10000 Mb/sBlinking twice
Network module slots
Port is not operating.
Off
Port is operating at up to 10 Gb/s.Blinking green
Port is operating in half duplex.
OffDUPLX (duplex)
Port is operating in full duplex.Green
The switch is not the active switch.
For a standalone switch, this LED is off.
Note
OffACTV (data active
switch)
The switch is the active switch.Green
Error during active switch election.Amber
Switch is a standby member of a data stack and assumes
active responsibilities if the current active switch fails.
Blinking green
Cisco Catalyst 9300 Series Switches Hardware Installation Guide
19
Product Overview
Port LEDs and Modes
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