Juniper Networks EX3200 manual Chassis Status LEDs in an EX4200 Switch

Chapter 2: Component Descriptions

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

LED Label	Color	State and Description
ALM (Alarm)	Unlit	There is no alarm.
	Red	There is a major alarm.
	Amber	There is a minor alarm.
SYS (System)	Green	■ On steadily—JUNOS Software for EX Series switches has
		been loaded on the switch.
		■ Blinking—The switch is booting.
MST (Master)	Green	■ 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.

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