Juniper Networks 8 manual 112

ERX 8.0.x Hardware Guide

Table 13: Troubleshooting Abnormal LED Activity on Modules (continued)

Diagnostic Signs	Possible Problems		Actions
LINK LED is not lit		Ethernet connection is down.	1.	Make sure that Ethernet cables are
				properly connected to both the
				Ethernet port and the appropriate
				network device.
			2.	Contact Juniper Networks Customer
				Service.
RED ALM is lit		System does not recognize a	1.	Make sure that all cables are firmly
		port connection.		plugged into the ports and the
		Cabling is not connected		attached network device.
			2.	Verify that cables are clean.
		properly.
		Cable is faulty.	3.	Test for faulty cables.
		Clocking problem exists.	4.	Verify clock source and
				configuration.
			5.	Reset system.
				NOTE: Problem is corrected when
				normal LED activity occurs.
YEL ALM is lit		Far end receive failure (FERF)	1.	Correct FERF problem.
NOTE: This LED is not functional on the		exists.	2.	Reset system.

HSSI line module.

NOTE: Problem is corrected when normal LED activity occurs.

System does not boot.	A slot group is overloaded.
Modules held offline.
FAIL LED lights.

1.Issue the show version command to display module status.

2.Review section on proper slot group configuration in “Installing Modules” on page 35.

3.Reconfigure system with correct slot group configuration.

4.Reset system.

No LED indications or obvious signs.

System temperature is too high. Vents are blocked.

Fans are not operating.

1.Look at your console for a message indicating the problem. If you have the system log set to a severity of WARNING or higher, a Warning message indicates the failure.

2.Issue the show environment command to display the temperatures. If the temperature is too high, power down the system.

3.Regulate temperature.

4.Reset system.

112 Understanding Status LEDs to Troubleshoot