- Juniper Router Hardware Guide
Chapter 9
Maintain Hardware Components
This chapter describ e s how to maintain hardware components installed in the router. For
informatio
n about returning a part to Juniper Networks for repair or replacement, see
“Return the Router or Its Components” on page 163.
• Routine Maintenance Procedures on page 75
• Maintain th
e Fan Tray on page 75
• Maintain Packet Forwarding E ngine Components on page 76
• Maintain the Power Supplies on page 78
• Maintain the Routing Engine on page 79
Routine Maintenance Procedures
For optimum router performance, perform the following preventive maintenance procedures
on a regular basis:
• Inspect the installation site for potential p roblems caused by moisture, loose wires or
cables, and excessive dust. Make sure that airflow around the router is unobstruc ted.
• Check the LEDs on the craft interface and on hardware components. See “Craft
Interface” on page 14.
Maintain the Fan Tray
Thefantrayinstallsintotherearofthechassis,asshowninFigure3.Tocheckthestatusof
the fans in the fan tray, issue the show chassis environment command. The output includes
an entry for each fan, as shown in this example:
user@host> show chassis environment
Class Item Status Measurement
...
Fans Left Fan 1 OK Spinning at normal speed
Left Fan 2 OK Spinning at normal speed
Left Fan 3 OK Spinning at normal speed
Left Fan 4 OK Spinning at normal speed
...
Maintain Hardware Components 75