Cisco Catalyst 4500 Series - Power Management

12-6
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
Power Management
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.
Table 12-4 describes the alarms.
Power Management
This section describes the power management feature in the Catalyst 4500 series switches. It includes
the following topics:
• Power Management for the Catalyst 4500 Series Switches, page 12-7
• Powering Down a Module, page 12-19
• Power Management for the Catalyst 4948 Switches, page 12-20
Table 12-4 Alarms on Supervisor Engine 6-E, Supervisor Engine 6L-E, and Supervisor Engine 7-E
Event
Alarm
Type
Supervisor LED
Color Timeout Description and Action
Card temperature exceeds the
critical threshold.
Major Red 15 min Syslog message displays when the alarm is
issued.
See Table 12-2 for the action on timeout.
Card temperature exceeds the
shutdown threshold.
Major Red 30 sec Syslog message displays when the alarm is
issued.
See Table 12-2 for the action on timeout.
Supervisor engine fails power-on
self-test (POST).
Major Red — Syslog message displays.
Supervisor engine fails to come up.
Chassis fan tray fails. Major Red 30 sec Syslog message displays when the alarm is
issued.
See Table 12-2 for the action on timeout.
Chassis temperature exceeds the
warning threshold.
Minor Orange — Syslog message when the alarm is issued.
Chassis fan tray experiences
partial failure.
Minor Orange — Syslog message when the alarm is issued.