Juniper Networks M160 manual LEDs on Hardware Components, Chassis and Interface Alarm Messages

Troubleshooting Hardware Components

LEDs on Hardware Components

LEDs on the faceplates of the following hardware components report their status:

DC power supply—A green LED labeled CB ON, a blue one labeled OUTPUT OK, and an amber one labeled CB OFF. The original power supply also has an amber LED labeled NO AIRFLOW. For more information, see “Power Supply” on page 36.

MCS—A blue LED labeled MASTER, a green one labeled OK, and an amber one labeled FAIL. For more information, see “MCS Components” on page 26.

PCG—A blue LED labeled MASTER, a green one labeled OK, and an amber one labeled FAIL. For more information, see “PCG Components” on page 19.

PIC—Most PICs have an LED labeled STATUS on the PIC faceplate. Some PICs have additional LEDs, often one per port. The meaning of the LED states differs for various PICs. For more information, see the M160 Internet Router PIC Guide.

SFM—A green LED labeled OK and a red one labeled FAIL. For more information, see “SFM Components” on page 20.

Chassis and Interface Alarm Messages

When the Routing Engine detects an alarm condition, it lights the red or yellow alarm LED on the craft interface as appropriate, trips the corresponding alarm relay contact on the CIP, and reports the cause of the alarm in the craft interface LCD. To view a more detailed description of the alarm cause, issue the show chassis alarms CLI command:

user@host> show chassis alarms

There are two classes of alarm messages:

Chassis alarms—Indicate a problem with a chassis component such as the cooling system or power supplies, as described in Table 26.

Interface alarms—Indicate a problem with a specific network interface, as described in Table 27.

In both Table 26 and Table 27, the text in the column labeled “LCD Message” appears in the LCD. The text in the column labeled “CLI Message” appears in the output from the show chassis alarms command.

Table 26: Chassis Alarm Messages

Component	LCD Message	CLI Message
Fans and	Fan Failure	RED ALARM - fan name Failure
impellers
	Fan Removed	YELLOW ALARM - fan name Removed
	Fans Missing	RED ALARM - Too many fans missing or failing

Overview of Troubleshooting Resources 209