Juniper Networks E-Series manual 10-7, Status Process, Diagnostic Signs Possible Problems Actions

Understanding Status LEDs to Troubleshoot E-Series Routers

10-7

LED Activity During Booting

When the system boots, it runs diagnostic tests, and the module status

LEDs display various configurations. Observe the scenario presented in

Table 10-3to verify that the system has booted properly.

Note: When you reboot the system after installing a new version of the software, the line modules will appear to boot twice.

Table 10-3Normal activity of functional status LEDS during booting

OK	FAIL	ONLINE	Status Process
off	on	off	1	Module is in the power-up restart state; the FAIL
				LED stays on briefly.
off	off	off	2	Module is initializing, and diagnostic tests are
				running.
on	off	off	3	Module passed the diagnostics; the system boots.
on	off	on	4	Module is now up and running.

If the system detects an error during booting, the FAIL LED turns on.

Some failure conditions may cause the board not to boot. In this case, the

LEDs may all be off. The system should then reset the board.

If the operational software detects an error, the FAIL LED turns on. Some errors may cause a board reset. Crash information can be displayed from the console and is printed to the screen on the next reboot.

Abnormal LED Activity

See Table 10-4to diagnose and correct problems.

Table 10-4Troubleshooting abnormal LED activity on modules

Diagnostic Signs	Possible Problems	Actions
• POWER A OK is not lit	• System is not receiving	1	Check Power A and Power B terminal connections.
	power from Power A.	2	Verify that power switches are on.
	• System is not receiving
• POWER B OK is not lit		3	Check connections to power sources.
	power from Power B.	4	If system still does not operate, contact Juniper

Networks Customer Service.