Understanding Status LEDs
ERX Edge Routers
8-9
Redundancy Status
You can determine the redundancy state of line modules by examining
the online and redundant status LEDs. See Table 8-5.
Note: The REDUNDANT LED on the cOCx/STMx, FE-8, GE/FE, HSSI, OC3 (dual
port), and OCx/STMx
modules is nonfunctional.
LINK LED is not lit • Ethernet connection is
down.
1 Check that Ethernet cables are properly connected to
both the Ethernet port and the appropriate network
device.
2 Contact Juniper Networks Customer Service.
RED ALM • System does not
recognize a port
connection.
• Cabling is not connected
properly.
• Cable is faulty.
• Clocking problem exists.
1 Check that all cables are firmly plugged into OC3
ports and the attached network device.
2 Verify that cables are clean.
3 Test for faulty cables.
4 Verify clock source and configuration.
5 Reset system.
Note: Problem is corrected when normal LED activity is
observed.
YEL ALM
Note: This LED is not
functional on the HSSI line
module.
• Far end receive failure
(FERF) exists.
1 Correct FERF problem.
2 Reset system.
Note: Problem is corrected when normal LED activity
is observed.
• System will not boot.
• Module(s) held offline.
• FAIL LED lights
A slot group is overloaded. 1 Issue the show version command to display board
status.
2 Review section on proper slot group configuration in
Chapter 3, Installing ERX Modules.
3 Reconfigure system with correct slot group
configuration.
4 Reset system.
None • System temperature is
too high.
• Vents are blocked.
• Fans are not operating.
1 Check 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
indicating the failure is displayed.
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.
Table 8-4 Troubleshooting abnormal LED activity on modules (continued)
Diagnostic Signs Possible Problems Actions
