3. If the craft interface display lists only one fan failure and the other fans are functioning
normally, the fan is probably faulty and you need to replace the fan tray.
4. Use the CLI to check the status of the fans. For example, you can issue the following
command to get information about the source of an alarm condition:
user@host> show chassis alarms
For information about the alarms, see Table 95 on page 470.
Related
Documentation
T640 Cooling System Description on page 31•
• Maintaining the T640 Air Filters on page 444
• Maintaining the T640 Fan Trays on page 445
• Replacing a T640 Air Filter on page 281
Troubleshooting the T640 Host Subsystem
Problem Description:
The following alarms and LEDs indicate a problem with a host subsystem control board
or Routing Engine:
• The red host subsystem FAIL LED on the craft interface is lit.
• The green host subsystem OK LED on the craft interface is not lit.
• A red alarm indicates that the host subsystem has been removed.
• A yellow alarm indicates that the host subystem has failed.
In Table 96 on page 472, the text in the column labeled ”LCD Message” appears in the
display of the craft interface. The text in the column labeled “CLI Message” appears in
the output from the show chassis alarms command.
Table 96: T640 Host Subsystem Alarm Messages
CLI MessageLCD MessageAlarm TypeComponent
Host host-number RemovedHost host-number RemovedRedHost subsystems
Host host-number FailureHost host-number FailureYellow
Solution To troubleshoot the T640 host subsystems:
1. Check the LEDs on the faceplate of each control board and Routing engine.
2. Check the LEDs on the craft interface.
Copyright © 2017, Juniper Networks, Inc.472
T640 Core Router Hardware Guide
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