12-5
Software Configuration Guide—Release IOS XE 3.3.0SG and IOS 15.1(1)SG
OL-25340-01
Chapter 12 Environmental Monitoring and Power Management
About Environmental Monitoring
supplies to protect itself from overheating. When this happens, you can recover the switch only by
cycling the power on and off switches on the power supplies or by cycling the AC or DC inputs to the
power supplies.
Critical and shutdown temperature emergencies trigger the same action. Table 12-2 lists temperature
emergencies but does not distinguish between critical and shutdown emergencies.
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 12-3 lists the possible environment alarms.
Table 12-2 Emergency and Action
Case 1. Complete fan failure emergency. Power down the chassis.
Case 2. Temperature emergency on a line
card.
Power down the line card.
Case 3. Temperature emergency on the
standby supervisor engine.
Power down the standby supervisor engine.
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 12-3 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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