Users Guide

Switch Management Commands 2394
a range, the fans run at a reduced speed for the lower temperature part of the
range and an increased speed for the higher temperature part of the range.
Each range runs the fans at increasingly higher speeds for increasingly higher
temperatures. Above the Critical status upper limit, the system is shut down.
Typically, the shutoff temperature for the switch is 90-105° C.
To avoid fan speed oscillation around a temperature limit, a small hysteresis is
added to the limit such that the temperature for increasing the fan speed is
higher than the temperature for lowering the fan speed. This implies that the
higher fan speed (and status) is maintained until the switch is cooled 3-5
degrees below the threshold for increasing the fan speed (and possibly
changing the status). The exact thresholds for increasing or lowering the fan
speed are determined during thermal analysis and are different for each
switch family.
Examples
console#show system temperature
System Thermal Conditions:
Unit Temperature State
(Celsius)
---- ----------- -----------
1 34 OK
Temperature Sensors:
Unit Description Temperature
(Celsius)
---- ------------------ -----------
1 MAC 33
1 PHY 34
show tech-support
Use the show tech-support command to display system and configuration
information for use in debugging or contacting technical support. The output
of the show tech-support command combines the output of the following
commands:
• show interfaces transceiver
• show power inline