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Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
Chapter 14 Environmental Monitoring and Power Management
About Environmental Monitoring
In Case 4, the standby supervisor engine takes over when the active engine resets itself. If the
temperature emergency remains, the newly active supervisor engine resets the standby supervisor
engine.
Case 5 applies to nonredundant chassis and to chassis with a standby supervisor engine that has been
shutdown or which has not fully booted.
System Alarms
Any system has two types of alarms: major and minor. A major alarm indicates a critical problem that
could lead to system shutdown. A minor alarm is informational—it alerts you to a problem that could
become critical if corrective action is not taken.
Table 14-3 lists the possible environment alarms.
Fan failure alarms are issued as soon as the fan failure condition is detected and are canceled when the
fan failure condition clears. Temperature alarms are issued as soon as the temperature reaches the
threshold temperature and are canceled when the temperature drops more than 5 degree C below the
threshold. 5 degree C is a hysteresis value designed to prevent toggling alarms.
An LED on the supervisor engine indicates whether an alarm has been issued.
When the system issues a major alarm, it starts a timer whose duration depends on the alarm. If the alarm
is not canceled before the timer expires, the system takes emergency action to protect itself from the
effects of overheating. The timer values and the emergency actions depend on the type of supervisor
engine.
Note Refer to the Catalyst 4500 Series Switch Module Installation Guide for information on LEDs, including
the startup behavior of the supervisor engine system LED.
Case 4. Temperature emergency on the
active supervisor engine with the standby
supervisor engine in the hot standby or cold
standby redundancy state.
Reset the active supervisor engine.
Case 5. Temperature emergency on the
active supervisor engine with no standby
supervisor engine or with a standby
supervisor engine that is not in hot standby
or cold standby redundancy state.
Power down the chassis.
Table 14-2 Emergency and Action
Case 1. Complete fan failure emergency. Power down the chassis.
Table 14-3 Possible Environmental Alarms
A temperature sensor over its warning threshold minor
A temperature sensor over its critical threshold major
A temperature sensor over its shutdown threshold major
A partial fan failure minor
A complete fan failure major
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