Juniper Networks 8 Manuel d'utilisateur Page 123

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Troubleshooting
familiarize yourself with LED activity so that you can easily detect and correct
a module-rela
ted problem with minimal or no system downtime.
LED Identification
The system’s mo dules have two sets of status LEDs. The top set indicates
overall route
r and module status. The bottom set indicates module-specific
status, such as port status (line modules) or fan status (SRP module).
The number next to the port status LED on a line module corresponds to the
number of the port on the I/O module. Some line modules have more port
status LEDs t
han the number of ports o n t he I/O module. In these cases, only
the LEDs for th e correspond ing ports on the I/O modules are active.
For example, an OCx/STMx line module can pair w ith either an OC3-4 or
an OC12/STM4 I/O module. Consequently, the line module has four port
status LEDs
for OC3/STM1 operation. However, only the top set of port
status LEDs is active during OC12/STM4 operation.
Table 11 presents the functions of the module LEDs and port status LEDs.
Table 11: LED Identification and Activity Descriptions
LED Location LED Label LED Indicator LED Color OFF to ON ON to OFF
OK
Module status
Green
Self-test passed Failure detected
FAIL
Module status Red Failure detected
Diagnostic test
running
All modules
ONLINE
Module status
Green
Module online Module offline
All modules
REDUNDANT
Redundancy
Green
See “Redundancy Status” on page 113.
NOTE: The REDUNDANT LED on the cOCx/STMx, FE-8, GE/FE, HSSI, OCx/STMx,
and X.21/V.35 line modules is nonfunctional.
SRP module
POWER A OK
Power
Green
Power online on
source A
Power off
POWER B OK
Power
Green
Power online on
source B
Power off
FAN OK Fan Green
Fan online Critical fan failure
FAN FAIL Fan
Red Critical fan failure Fan online
NOTE: When the LED alternates between OK and FAIL at 10-second intervals, a
noncritical fan failure exists.
LINK
Ethernet
Green
Ethernet link up Ethernet link
down
ACTIVITY
Ethernet
Green
Blinks when
Ethernet traffic
on link
No Ethernet traffic
on link
Understanding Status LEDs to Troubleshoot 105
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