System Alarms - Cisco Catalyst 4500 Series Configuration Manual

Chapter 12 Environmental Monitoring and Power Management
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.
Table 12-2
Case 1. Complete fan failure emergency.
Case 2. Temperature emergency on a line
card.
Case 3. Temperature emergency on 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.
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.
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
Table 12-3
A temperature sensor over its warning threshold
A temperature sensor over its critical threshold
A temperature sensor over its shutdown threshold major
A partial fan failure
A complete fan failure
OL-25340-01
Emergency and Action
lists the possible environment alarms.
Possible Environmental Alarms
Software Configuration Guide—Release IOS XE 3.3.0SG and IOS 15.1(1)SG
Power down the chassis.
Power down the line card.
Power down the standby supervisor engine.
Reset the active supervisor engine.
Power down the chassis.
minor
major
minor
major
About Environmental Monitoring
12-5