Module LEDs can show you the immediate status of a module and
alert you to a problem with the module or one of its ports. We recommend
you familiarize yourself with LED activity so that you can easily
detect and correct a module-related problem with minimal or no system
downtime.
LED Identification
Most modules have two sets of status LEDs. The top set indicates
basic functional status of the router or module. The bottom set indicates
system status for that module, such as port status (line modules and
IOAs) or fan status (SRP modules). See Figure 32 and Figure 33 for LED locations
and labeling. See Table 10 for descriptions
of LED activity for all modules and IOAs.
Figure 32: Typical IOA LEDs
Figure 33: SRP IOA Module LEDs
Note:
The primary SRP module illuminates the REDUNDANT LED when the
SRP module is part of a redundancy group and it is up and running
(or ready to take over). The standby SRP module monitors an activity
signal from the primary SRP module to determine its state; it does
not shadow the operations of the primary SRP module. If the standby
SRP module detects that the primary SRP module is not active (and
high-availability mode is not enabled), it reboots the system and
takes control. If high-availability mode has been enabled, automatic
switchover occurs with near hitless failover.
Table 10: LED Identification
and Activity Descriptions
LED Location
LED Label
LED Indicator
LED Color
OFF to ON
ON to OFF
All modules
OK
Module status
Green
Self-test passed
Failure detected
FAIL
Module status
Red
Failure detected
Diagnostic test running
ONLINE
Module status
Green
Module online
Module offline
Line module
REDUN
Redundancy
Green
Module is active, and a standby module is available
Module is active, and no standby module is available
SFM module
REDUN
Redundancy
Green
N+1 redundancy is enabled; 2 SRPs and 3 SFMs must be installed
and working.
When LED is lit, you can remove the module without interrupting
service.
One of the five fabric slices is down or not installed.
N+1 redundancy is not enabled.
SRP module
REDUN
Redundancy
Green
Module is the spare system controller, is up, and is ready to
take the role of the online system controller.
Module is no longer acting as the spare system controller.
PA
Power A
Green
Power is online on source A.
Power is off.
PB
Power B
Green
Power is online on source B.
Power is off.
FO
Fan online
Green
Fan is online.
Critical fan failure.
FF
Fan failure
Red
Critical fan failure.
Fan is online.
NOTE: You can run the show environment command to see whether a noncritical
fan failure exists.
LK
Ethernet link
Green
Ethernet link is up.
Ethernet link is down.
AC
Ethernet activity
Green
Blinks when Ethernet traffic is on link.
No Ethernet traffic is on link.
IOAs
NOTE: Not all IOAs have the following
LEDs.
ALM
Port status
Yellow
The remote end of the link is experiencing loss of signal (FERF).
No FERF present, port is working correctly.
Port status
Red
Port is experiencing loss of signal.
Port is working correctly; in sync.
OK
Port status
Physical link is connected properly and is functioning properly.
Physical link is not connected properly and is not functioning
properly.
LED Activity
When the system boots, it runs a series of tests for each module
installed in the system, and the LEDs display various configurations.
See Table 11 and Table 12 to understand normal and abnormal LED activity.
Note:
When you reboot the system after installing a new version of
the software, the line modules appear to boot twice.
Table 11: Normal
Activity of Functional Status LEDs During Booting
OK
FAIL
ONLINE
Status Process
off
off
off
1. Module is in the power-up restart state; the FAIL LED stays
on briefly.
off
on
off
2. Module is initializing, and diagnostic tests are running;
the FAIL LED stays on briefly.
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
lights. Some failure conditions can cause the module not to boot.
In this case, the LEDs might all be off. The system then resets the
module.
If the operational software detects an error, the FAIL LED lights.
Some errors can cause a module reset. Crash information is displayed
at the console on the next reboot.
Table 12: Troubleshooting
Abnormal LED Activity on Modules
Diagnostic Signs
Possible Problems
Actions
POWER A (PA) LED is not lit
POWER B (PB) LED is not lit
System is not receiving power from Power A.
System is not receiving power from Power B.
Make sure Power A and Power B terminal connections
are securely attached.
Verify that power switches are on.
Make sure connections to power sources are securely
attached.
If system still does not operate, contact the Juniper
Networks Technical Assistance Center.
FAIL LED lights
The line module and IOA are incompatible.
A hardware failure, such as a failed module.
Make sure that the line modules and IOAs are
compatible; replace if necessary.
If you replaced the IOA only, issue the reload slot slot_number command.
If you replaced the line module or if there was
a hardware failure, the system is supposed to automatically reset
the module.
If the condition persists, contact the Juniper
Networks Technical Assistance Center.
FAN OK LED does not light
FAN FAIL LED lights
Fan is not working properly or has slowed down.
Fan needs replacement.
Contact the Juniper Networks Technical Assistance Center; the
system must be serviced.
Note:
In the fan tray for the E320 Broadband Services Router,
four of the eight fans turn on immediately upon initial power-up and
the other four fans turn on after a delay of 10 seconds.
LINK LED is not lit
Ethernet connection is down.
Make sure that Ethernet cables are properly
connected to both the Ethernet port and the appropriate network device.
If the condition persists, contact the Juniper
Networks Technical Assistance Center.
ALM LED is red
System does not recognize a port connection.
Cabling is not connected properly.
Cable is faulty.
Clocking problem exists.
Make sure that all cables are firmly plugged
into the ports and the attached network device.
Verify that cables are clean.
Test for faulty cables.
Verify clock source and configuration.
Reset the system.
NOTE: Problem is corrected when normal
LED activity occurs.
ALM LED is yellow
Far end receive failure (FERF) exists.
Correct FERF problem.
Reset the system.
NOTE: Problem is corrected when normal
LED activity occurs.
PA, FO, and LK LEDs on SRP module are on, but are off on LM
and SFM module
Thermal protection mode has been enabled.
System temperature is too high.
Vents are blocked.
Fans are not operating.
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.
Issue the show environment command to display the temperatures. If the temperature is too high,
power down the system.
