Troubleshooting The Mx5, Mx10, Mx40, And Mx80 Fan Tray - Juniper MX10 Hardware Manual

Troubleshooting the MX5, MX10, MX40, and MX80 Fan Tray

Problem
Solution
user@host> show chassis fan
Item
Fan 1
Fan 2
Fan 3
Fan 4
Fan 5
user@host> show chassis temperature-thresholds
Item
Chassis default
Routing Engine
Copyright © 2017, Juniper Networks, Inc.
traceroute
show chassis alarms
Description: The fans in the fan tray are not functioning normally.
Follow these guidelines to troubleshoot the fans:
Check the alarm LEDs on the front panel.
Issue the
show chassis fan
Status RPM
OK 4560
OK 4560
OK 4560
OK 4560
OK 4560
If the red alarm LED on the front panel lights, issue the
to get information about the source of an alarm condition.
If the CLI output lists only one fan failure, and the other fans are functioning normally,
the fan is most likely faulty and you must replace the fan tray.
Place your hand near the exhaust vents at the side of the chassis to determine whether
the fans are pushing air out of the chassis.
If a fan tray is removed, a yellow alarm and a red alarm occur.
The following conditions automatically cause the fans to run at full speed and also
trigger the indicated alarm:
A fan fails (red alarm).
The router temperature exceeds the "temperature warm" threshold (yellow alarm).
The temperature of the router exceeds the maximum "temperature hot" threshold
(red alarm and automatic shutdown of the power supplies).
To view the temperature threshold settings, issue the
temperature-thresholds
Fan speed Yellow alarm
Normal High Normal
48 54 65
55 60 75
command to get status information about the fans.
Measurement
Spinning at intermediate-speed
Spinning at intermediate-speed
Spinning at intermediate-speed
Spinning at intermediate-speed
Spinning at intermediate-speed
command.
Red alarm
Bad fan Normal Bad fan
55 75
65 85
Chapter 22: Troubleshooting Components
command
show chassis alarms
show chassis
65
70
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