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ERX 11.3.x Hardware Guide
Verifying the Installation
Replacing Fan Trays
88
If you are using the redundant port on the GE I/O module, repeat Steps 2–7 for the other
port.
After you have replaced the SFPs and connected the cables, issue the show interface
gigabitEthernet command for each interface to make sure that the interface is operational
(up).
Field descriptions
gigabitEthernet interfaceSpecifier—Status of the hardware on this interface
Up—Hardware is operational
Down—Hardware is not operational
Administrative status—Operational state that you configured for this interface
Up—Interface is enabled
Down—Interface is disabled
Example
host1:vr2#show interfaces gigabitEthernet2/0
gigabitEthernet2/0 is Up, Administrative status is Up
A tray of cooling fans provides forced air cooling for components in the ERX routers. The
fan trays are hot-swappable; you can replace them without powering down the system.
However, if you do not replace the fan tray within approximately 2 minutes, the system
enters thermal protection mode. For information about thermal protection mode, see
"Monitoring Temperatures of Modules" on page 103.
You can monitor fan status by observing the LEDs on the SRP module or on the fan tray
behind the faceplate. For complete LED information, see "Understanding Status LEDs
to Troubleshoot" on page 96.
NOTE: On the SRP module, when the LED alternates between OK and FAIL
in 10–second intervals, a non-critical fan failure exists. Noncritical warnings
are not indicated on the fan tray LEDs; if the red FAN FAIL LED is illuminated,
either a critical or non-critical failure exists.
CAUTION: If the red FAN FAIL LED on the SRP module is illuminated and
none of the fans are spinning when you remove the fan tray, power down the
system until a new fan tray is available. Operating an ERX router with
inadequate air circulation can damage the modules.
Copyright © 2010, Juniper Networks, Inc.
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Troubleshooting
