Juniper EX4200 Hardware Manual page 38

Figure 9: Chassis Status LEDs in an EX4200 Switch
Table 6 on page 38 describes the chassis status LEDs in an EX4200 switch, their colors and states, and
the status they indicate. You can view the colors of the three LEDs remotely through the CLI by issuing
the operational mode command show chassis lcd.
Table 6: Chassis Status LEDs in an EX4200 Switch
LED Label
ALM (Alarm)
SYS (System)
Color
Unlit
Red
Amber
Green
State and Description
There is no alarm or the switch is halted.
There is a major alarm.
NOTE: When you connect power to the switch, the Alarm
(ALM) LED lights 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" on page
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.
NOTE: The Alarm (ALM) LED lights amber 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 command
request system configuration rescue save.
On steadily—Junos OS for EX Series switches has been
loaded on the switch.
Blinking—The switch is booting.
Off—The switch is powered off or is halted.
38
141.)