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Chassis Status LEDs on EX4300 Switches

EX4300 switches except EX4300-48MP and EX4300-48MP-S switches have three chassis status LEDs (labeled ALM, SYS, and MST) on the right of the LCD panel, next to the Menu and Enter buttons (see Figure 1). EX4300-48MP and EX4300-48MP-S switches have three chassis status LEDs (labeled ALM, SYS, and MST) on the right of the front panel (see Figure 2).

Figure 1: Chassis Status LEDs in EX4300 Switches Except EX4300-48MP and EX4300-48MP-S SwitchesChassis Status LEDs in EX4300 Switches Except EX4300-48MP and EX4300-48MP-S Switches
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LCD panel

  3
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LCD panel Menu button

  2
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LCD panel Enter button

  4
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Chassis status LEDs

Figure 2: Chassis Status LEDs in EX4300-48MP and EX4300-48MP-S SwitchesChassis Status LEDs in EX4300-48MP and EX4300-48MP-S Switches
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Chassis status LEDs

 

Table 1 describes the chassis status LEDs on an EX4300 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 led.

Table 1: Chassis Status LEDs on an EX4300 Switch

LED Label

Color

State and Description

ALM (Alarm)

Unlit

There is no alarm or the switch is halted.

Red

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.

Yellow (on EX4300 switches except EX4300-48MP and EX4300-48MP-S switches) or amber (on EX4300-48MP and EX4300-48MP-S switches)

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 command request system configuration rescue save.

SYS (System)

Green

  • 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.

Unlit

  • EX4300 switches except EX4300-48MP and EX4300-48MP-S switches—The switch is powered off or is halted.

  • EX4300-48MP and EX4300-48MP-S switches—The switch is booting or the switch is powered off or is halted.

MST (Primary)

Green

In a standalone EX4300 switch:

  • On steadily—The switch is functioning normally.

  • Off—The switch is powered off or is halted.

In a Virtual Chassis configuration:

  • On steadily—The switch is the primary in the Virtual Chassis configuration.

  • Blinking—The switch is the backup in the Virtual Chassis configuration.

  • Off—The switch is a line card member in the Virtual Chassis configuration or is halted.

A major alarm (red) indicates a critical error condition that requires immediate action.

A minor alarm (yellow or 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.

All three LEDs can be lit simultaneously.

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