MeaningLED Position or
Color
LED
The 10/100/1000 BASE-T Ethernet
management port is operational (link up).
Green
MANAGEMENT
No signal is detected for the 10/100/1000
BASE-T Ethernet management port, or there
is a link configuration failure, or the link is
disabled by user (link down).
Off
SFP or SFP+ port link is up but there is no
packet activity.
Green
SFP or SFP+ UPLINK STATUS
Triangular LEDs pointing up or down,
indicating the status of the corresponding
port.
SFP or SFP+ port link is up and indicating
packet activity.
Blinking Green
SFP or SFP+ link is disabled by the user,
that is, administratively down.
Amber
Hardware (PHY) has detected a faulty port
link.
Blinking Amber
Error packets are being detected on the port
link. The error packets could be bad Cyclic
Redundancy Check (CRC) packets, jumbo
packets, etc.
Alternating Green
and Amber
SFP or SFP+ port link is down.Off
QSFP port link is up but there is no packet
activity.
Green
QSFP UPLINK STATUS
LEDs next to each QSFP port number,
indicating the status of the corresponding
port.
QSFP port link is up and indicating packet
activity.
Blinking Green
QSFP port link is disabled by the user, that
is, administratively down.
Amber
Error packets are being detected on the
QSFP port link. The error packets could be
bad Cyclic Redundancy Check (CRC)
packets, jumbo packets, etc.
Alternating Green
and Amber
QSFP port link is down.Off
Cisco Catalyst 9400 Series Switches Hardware Installation Guide
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LEDs
Cisco Catalyst 9400 Series Supervisor Module LEDs