Juniper EX4400 - Page 72

Table 33 on page 64 describes the chassis status LEDs labeled SYS, ALM, and MST on an EX4400
switch, their colors and states, and the status they indicate. You can view the colors of the LEDs
remotely through the CLI by issuing the show chassis led operaonal mode command. All LEDs can be lit
simultaneously.
Table 33: SYS, ALM, and MST Chassis Status LEDs on EX4400 Switches
LED Label Color State and Descripon
SYS Green
• On steadily—Junos OS for EX Series switches is
loaded on the switch.
• Blinking—The switch is boong.
Unlit The switch is powered o or is halted.
ALM Red There is a major hardware fault, such as a temperature
alarm or a power failure alarm, and the switch is halted.
A major alarm indicates a crical error condion that
requires immediate aenon (see "Chassis Component
Alarm Condions on EX4400 Switches" on page 243).
Amber There is a minor alarm, such as a soware or a hardware
error. Power o the switch and then power it on. Monitor
the switch to see whether it is working properly.
A minor alarm indicates a noncrical condion that
requires monitoring or maintenance. A minor alarm that is
le unchecked might cause interrupon in service or
performance degradaon.
Unlit There is no alarm or the switch is halted.
MST Green In a standalone switch:
• On steadily—The switch is funconing normally.
• O—The switch is powered o or is halted.
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