Enabling Or Disabling Power Redundancy - Cisco WS-SUP32-GE-3B - Supervisor Engine 32 Software Configuration Manual

Understanding How Power Management Works
The modules have different power requirements, and some configurations require more power than a
single power supply can provide. The power management feature allows you to power all installed
modules with two power supplies. However, redundancy is not supported in this configuration because
the total power drawn from both power supplies is at no time greater than the capability of one supply.
Redundant and nonredundant power configurations are described in the following sections.
To determine the power requirements for your system, see the
Requirements" section on page

Enabling or Disabling Power Redundancy

To disable or enable redundancy (redundancy is enabled by default) from global configuration mode,
enter the power redundancy-mode combined | redundant commands. You can change the
configuration of the power supplies to redundant or nonredundant at any time.
To disable redundancy, use the combined keyword. In a nonredundant configuration, the power available
to the system is the combined power capability of both power supplies. The system powers up as many
modules as the combined capacity allows. However, if one power supply fails and there is not enough
power for all of the previously powered-up modules, the system powers down those modules.
To enable redundancy, use the redundant keyword. In a redundant configuration, the total power drawn
from both power supplies is not greater than the capability of one power supply. If one supply
malfunctions, the other supply can take over the entire system load. When you install and power up two
power supplies, each concurrently provides approximately half of the required power to the system. Load
sharing and redundancy are enabled automatically; no software configuration is required.
To view the current state of modules and the total power available for modules, enter the show power
command (see the
Table 50-1
Table 50-1 Effects of Power Supply Configuration Changes
Configuration Change
Redundant to nonredundant
Nonredundant to redundant (both
power supplies must be of equal
wattage)
Equal wattage power supply is
inserted with redundancy enabled
Catalyst Supervisor Engine 32 PISA Cisco IOS Software Configuration Guide, Release 12.2ZY
50-2
50-5.
"Viewing System Power Status" section on page
describes how the system responds to changes in the power supply configuration.
Effect
System log and syslog messages are generated.
•
System power is increased to the combined power capability of both power
•
supplies.
Modules marked power-deny in the show power oper state field are brought up if
•
there is sufficient power.
System log and syslog messages are generated.
•
System power is decreased to the power capability of one supply.
•
• If there is not enough power for all previously powered-up modules, some modules
are powered down and marked as power-deny in the show power oper state field.
• System log and syslog messages are generated.
• System power equals the power capability of one supply.
• No change in module status because the power capability is unchanged.
Chapter 50 Power Management and Environmental Monitoring
"Determining System Power
50-4).
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