Figure 10: Chassis Status LEDs in an EX4200 Switch
Table 6 on page 19 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
State and DescriptionColorLED Label
There is no alarm.UnlitALM (Alarm)
There is a major alarm.Red
There is a minor alarm.Amber
■On steadily—JUNOS Software for EX Series switches has
been loaded on the switch.
■Blinking—The switch is booting.
GreenSYS (System)
■On steadily—The switch is the master in the Virtual
Chassis configuration.
■Blinking—The switch is the backup in the Virtual Chassis
configuration.
■Off—The switch is a linecard member in the Virtual
Chassis configuration.
GreenMST (Master)
A major alarm (red) indicates a critical error condition that requires immediate action.
A minor alarm (amber) 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 amber glow of the Alarm LED that indicates a minor alarm closely
resembles the red glow that indicates a major alarm.
All three LEDs can be lit simultaneously.
Related Topics Front Panel of an EX4200 Switch on page 10■
■Checking Active Alarms with the J-Web Interface
Chassis Status LEDs in EX4200 Switches ■19
Chapter 2: Component Descriptions