Juniper E Series User Manual

Understanding Status LEDs to Troubleshoot ! 105
Chapter 10: Troubleshooting
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 13 to verify that the
system has booted properly.
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 14 to diagnose and correct problems.
NOTE: When you reboot the system after installing a new version of the software,
the line modules will appear to boot twice.
Table 13: Normal 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.
Table 14: Troubleshooting abnormal LED activity on modules
Diagnostic Signs Possible Problems Actions
! POWER A OK is not lit
! POWER B OK is not lit
! System is not receiving power from
Power A.
! System is not receiving power from
Power B.
1. Check Power A and Power B terminal connections.
2. Verify that power switches are on.
3. Check connections to power sources.
4. If system still does not operate, contact Juniper
Networks Customer Service.
FAIL LED lights
! The line module and I/O module
are incompatible.
! A hardware failure, such as a failed
module.
1. Check that the line and I/O modules are compatible;
replace if necessary.
2. If you replaced the I/O module only, issue the reload
slot slot_number command.
3. If you replaced the line module or if there was a
hardware failure, the system should automatically reset
the module.
4. If condition persists, contact Juniper Networks Customer
Service.

Juniper E Series Specifications

General

Brand	Juniper
Model	E Series
Category	Network Router
Language	English