Juniper EX4300 Series Hardware Manual page 80

Table 18: Chassis Status LEDs on an EX4300 Switch
LED Label Color
ALM (Alarm) Unlit
Red
Yellow (on EX4300
switches except
EX4300-48MP and
EX4300-48MP-S
switches) or amber (on
EX4300-48MP and
EX4300-48MP-S
switches)
SYS (System) Green
State and Description
There is no alarm or the switch is halted.
There is a major alarm. A major alarm indicates a critical error
condition that requires immediate attention.
NOTE: When you connect power to the switch, the Alarm
(ALM) LED glows red. This behavior is normal. Plugging an
active Ethernet cable into the management (MGMT) port on
the switch completes the network link and turns off the ALM
LED. (See Connect a Device to a Network for Out-of-Band
Management
.)
Connecting the switch to a dedicated management console
instead of a network does not affect the ALM LED. The LED
remains red until the switch is connected to a network.
There is a minor alarm. A minor alarm indicates a noncritical
condition that requires monitoring or maintenance. A minor
alarm that is left unchecked might cause interruption in
service or performance degradation.
NOTE: The Alarm (ALM) LED glows yellow on EX4300
switches except EX4300-48MP and EX4300-48MP-S
switches or amber on EX4300-48MP and EX4300-48MP-S
switches if you commit a configuration to make it active on
the switch and do not also create a rescue configuration to
back it up. To save the most recently committed configuration
as the rescue configuration, enter the operational mode
request system configuration rescue save
command
•
On steadily—Junos OS for EX Series switches has been
loaded on the switch.
•
Blinking (not applicable for EX4300-48MP and
EX4300-48MP-S switches)—The switch is booting.
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