Chapter 2: Switch Administration 37
Environmental status
Feature overview You can monitor the physical status of the switch by observing the status of the
fans, power supply status, and temperature.
The following status information can be obtained on a unit, or on all units in a
stack:
The status made available to the user depends on the status reporting capabilities
of the actual hardware platforms used.
Conditions that
generate traps
An SNMP trap and a log message is sent if there is a change in the power supply
status or the status of any of the cooling fans. If the temperature of the switch
exceeds the threshold, a trap and a log message is sent indicating that the device
is operating at an unsafe temperature. If the temperature then falls 5 degrees
below the threshold, another trap and a log message is sent to clear the
temperature condition. If the switch remains above the critical threshold for five
seconds, it is powered down.
When an over-temperature condition causes the switch to power down, AC input
power must be completely removed from both power supplies of the switch to
reset the thermal protection circuits. To restore switch operation, unplug the
power cables from both AC power sockets of the switch, wait a few seconds, and
then reconnect them.
The temperature sensors and power levels are read about every 30 seconds. Fan
speeds are also updated in accordance with the temperature status level.
Name Description Range
Power Supply Status Indicates if the power supply is
functioning correctly
OK/FAILURE
Fan Status Indicates if the cooling fan is
functioning correctly
OK/FAILURE
Temperature Indicates the temperature of the
switch
degrees Celsius
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