Installation Guide

For information about checking the current low and high temperature threshold settings for modules and fan speeds, refer to Displaying
temperature thresholds for modules and fan speeds on page 213.
NOTE
Adjusting fan controls out of the default setting can negatively aect the ecient cooling of blades and may cause a blade to
overheat and shutdown.
You can change the default low and high temperature thresholds for a particular module and fan speed. For example, to change the low
and high thresholds of the medium fan speed for the management modules to 56 ° C and 72 ° s C, respectively, enter the following
command at the global CONFIG level of the CLI.
device(config)# fan-threshold mp med 56 72
Syntax: fan-threshold l module[ lowhigh-threshold] [ medlow-threshold high-threshold][ med-hilow-threshold high-threshold][ highlow-
threshold high-threshold]
For the module parameter, you can specify the following:
• lp - Changes low and high temperature thresholds for Gen 1 interface modules
• lp2 - Changes low and high temperature thresholds for Gen 2 interface modules
• mp - Changes low and high temperature thresholds for management modules
• mp-cpu - Changes low and high temperature thresholds for the management module CPU
• switch-fabric - Changes low and high temperature thresholds for non-high-speed switch fabric modules
• switch-fabric-g2 - Changes low and high temperature thresholds for high speed switch fabric modules (hSFM)
For the low-threshold and high-threshold parameters, you can specify any temperature in Centigrade. However, when changing low and
high temperature thresholds for module fan speeds, remember that the low temperature threshold of a higher fan speed must be lower
than the high temperature threshold of the lower fan speed. Extreme Networks has established this guideline to ensure fan speed
stability.
For example, if you are changing the temperature thresholds for a management module high and medium-high fan speeds, the system
will accept the following values because the low temperature threshold for the high speed (79 ° C) is lower than the high temperature
threshold (82 ° C) for the medium-high speed.
Fan speed Low temperature threshold High temperature threshold
High 79 ° C 87 ° C
Medium-high 69 ° C 82 ° C
The device will not accept the following values because the low temperature threshold for the high speed (83 ° C) is higher than the high
temperature threshold (82 ° C) for the medium-high speed.
Fan speed Low temperature threshold High temperature threshold
High 83 ° C 87 ° C
Medium-high 69 ° C 82 ° C
Displaying temperature thresholds for modules and fan speeds
To check the current settings of the low and high temperature thresholds for modules and fan speeds, you can enter the show fan-
threshold command at any level of the CLI.
device# show fan-threshold
=== Thermal Sensor Control Block (THERMAL_SENSOR_TEST_RULE_MP) ===
Managing the cooling system
Extreme Routing MLX Series Hardware Installation Guide
53-1004203-04 213