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Table 12: Troubleshooting Abnormal LED Activity on Modules (continued)
Diagnostic Signs
Possible Problems
LINK LED is not lit
ALM LED is red
ALM LED is yellow
PA, FO, and LK LEDs
on SRP module are on,
but are off on LM and
SFM module
Monitoring Temperatures of Modules
You can view the temperature of each module by issuing the show environment all
and show environment table commands. In addition, the system generates detailed
log messages if the temperature of a module is outside normal operating limits.
For example, if the temperature of any forwarding controller exceeds 212°F (100°C),
a message appears on the console and the event is added to the system log. If you
receive this message, report it to your customer service representative.
If the temperature of any module exceeds the upper temperature limit, the system
immediately goes into thermal protection mode. After the system has entered thermal
protection mode, you must resolve the cause of the high temperature quickly.
Ethernet connection is down.
System does not recognize a
port connection.
Cabling is not connected
properly.
Cable is faulty.
Clocking problem exists.
Far end receive failure (FERF)
exists.
Thermal protection mode has
been enabled.
System temperature is too
high.
Vents are blocked.
Fans are not operating.
Actions
1.
Make sure that Ethernet cables are properly connected to
both the Ethernet port and the appropriate network device.
2.
If the condition persists, contact the Juniper Networks
Technical Assistance Center.
1.
Make sure that all cables are firmly plugged into the 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 the system.
NOTE: Problem is corrected when normal LED activity
occurs.
1.
Correct FERF problem.
2.
Reset the system.
NOTE: Problem is corrected when normal LED activity
occurs.
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 the system.
Monitoring Temperatures of Modules
Chapter 9: Troubleshooting
85
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Table of Contents
Troubleshooting
