Installation Guide

For example, to set the speed of fan 0 to medium-high, enter the following command.
device# set-fan-speed med-high
For the fan-speed parameter, you can specify the following:
Syntax: set fan speed [ auto | high |low |med | med-high]
• auto - The system is adjusted by the monitoring system.
• high - The system sets the fan speed to high.
• low - The system sets the fan speed to low.
• med - The system sets the fan speed to medium.
• med-high - The system sets the fan speed to medium-high.
Monitoring the cooling system
You can monitor the following aspects of the router cooling system:
• The temperature of the fan control modules
• The status and speed of the fans
• The temperature warnings sent to the system log and that generate an SNMP trap
Displaying fan tray status and speed
To display the status and speed of the 4-speed fans in the router, enter the show chassis command at any level of the CLI.
device# show chassis
...
--- FANS ---
Back fan tray 1: Status = OK, Speed = LOW (50%)
Back fan tray 2: Status = OK, Speed = LOW (50%)
Back fan tray 3: Status = OK, Speed = LOW (50%)
Back fan tray 4: Status = OK, Speed = LOW (50%)
For information about all output generated by the show chassis command, refer to Displaying device status and temperature readings on
page 204.
TABLE 45 Fan status and speed
elds
Field Description
Status The status can be one of the following:
• OK - The fan is functioning properly and is keeping the
temperature of each module within an acceptable temperature
range.
• Failed - The fan is not functioning properly or the fan control
module cannot control the fan.
Speed The speed can be one of the following:
• LOW - The fan is functioning at 50 percent of capacity.
• MEDIUM - The fan is functioning at 75 percent of capacity.
• MEDIUM-HIGH - The fan is functioning at 90 percent of
capacity.
• HIGH - The fan is functioning at 100 percent of capacity.
Managing the cooling system
Extreme Routing MLX Series Hardware Installation Guide
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