Maintaining The Mx2020 Fan Trays - Juniper MX2020 Hardware Manual

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Maintaining the MX2020 Fan Trays

Purpose
Action
Copyright © 2015, Juniper Networks, Inc.
Flow Control TX is Disabled
Flow Control RX is Disabled
Link is down on GE port 22 connected to device: Debug-GigE
Link is good on GE port 23 connected to device: SPMB
Speed is 1000Mb
Duplex is full
Autonegotiate is Enabled
Flow Control TX is Disabled
Flow Control RX is Disabled
Link is down on XE port 24 connected to device: SFP+ 0
Link is down on XE port 25 connected to device: SFP+ 1
Link is down on XE port 26 connected to device: RE-10GigE
Link is down on XE port 27 connected to device: Other RE-10GigE
For further description of the output from the command, see the
and Services Command Reference
MX2020 Host Subsystem Description on page 57
Troubleshooting the MX2020 Host Subsystems on page 536
For optimum cooling, verify the condition of the fans.
Monitor the status of the fans. The fan trays each contain multiple fans that work in
unison to cool the router components. If one fan fails, the host subsystem adjusts the
speed of the remaining fans to maintain proper cooling. A red alarm is triggered when
a fan fails, and a yellow alarm is triggered when a fan tray is removed. During normal
operation, the fans in each fan tray function at normal speed.
To display the status of the cooling system, issue the
command,
show chassis environment monitored
temperature-thresholds
For the fan trays, the output for the
the following:
user@host> show chassis environment
Class Item
Temp PSM 0
PSM 1
PSM 2
PSM 3
PSM 4
PSM 5
PSM 6
PSM 7
PSM 8
PSM 9
.
command,
command, or
show chassis fan
show chassis environment
Status
Absent
Absent
Absent
Absent
OK
OK
OK
OK
OK
Absent
Chapter 23: Maintaining Components
Junos OS System Basics
show chassis environment
show chassis
command.
command is similar to
Measurement
34 degrees C / 93 degrees F
31 degrees C / 87 degrees F
30 degrees C / 86 degrees F
30 degrees C / 86 degrees F
31 degrees C / 87 degrees F
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