22-12
Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
OL-8978-04
Chapter 22 Administering the Switch
Power Management
Note The minimum downtime argument is valid only if the system has a standby supervisor engine.
This example shows how to schedule a reset in a specified time:
Console> (enable) reset in 5:20 Configuration update
Reset scheduled in 5 hours 20 minutes.
Reset reason: Configuration update
Proceed with scheduled reset? (y/n) [n]? y
Reset scheduled for 19:56:01, Wed Aug 18 1999 (in 5 hours 20 minutes).
Reset reason: Configuration update
Console> (enable)
Power Management
This section describes power management in the Catalyst 6500 series switches and includes the
following information:
• Enabling or Disabling Power Redundancy, page 22-12
• Using the CLI to Power Modules Up or Down, page 22-14
Note In systems with redundant power supplies, both power supplies must have the same wattage. The
Catalyst 6500 series switches allow you to mix AC-input and DC-input power supplies in the same
chassis. For detailed information on supported power supply configurations for each chassis, refer to the
Catalyst 6500 Series Switch Installation Guide.
Catalyst 6500 series modules have different power requirements. Depending upon the wattage of the
power supply, certain switch configurations might require more power than a single power supply can
provide. Although the power management feature allows you to power all installed modules with two
power supplies, redundancy is not supported in this configuration. The redundant and nonredundant
power configurations are discussed in the following sections.
Enabling or Disabling Power Redundancy
Enter the set power redundancy enable | disable command to enable or disable redundancy
(redundancy is enabled by default). With redundancy enabled and two power supplies of equal wattage
installed, the total power that is drawn from both supplies is at no time greater than the capability of one
supply. If one supply malfunctions, the other supply can take over the entire system load. When you
install and turn on two power supplies of equal wattage, each concurrently provides approximately half
of the required power to the system. Load sharing and redundancy are enabled automatically; no
software configuration is required.
With redundancy enabled, if you power up the system with two power supplies of unequal wattage, both
power supplies come online but a syslog message displays that the lower wattage power supply will be
disabled. If the active power supply fails, the lower wattage power supply that was disabled comes online
and, if necessary, the modules are powered down to accommodate the lower wattage power supply.
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