Enabling Or Disabling Power Redundancy - Cisco 6500 Series Software Configuration Manual

Understanding How Power Management Works

Enabling or Disabling Power Redundancy

From global configuration mode, enter the power redundancy-mode combined | redundant commands
to disable or enable redundancy (redundancy is enabled by default). You can change the configuration
of the power supplies to redundant or nonredundant at any time.
Specifying the combined keyword disables redundancy. 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 supply should fail and there is not
enough power for all previously powered up modules, the system powers down those modules for which
there is not enough power.
Specifying the redundant keyword enables redundancy. In a redundant configuration, the total power
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, each concurrently provides approximately half of the required power to the system. Load
sharing and redundancy are enabled automatically; no software configuration is required.
Enter the show power command to view the current state of modules and the total power available for
modules (see the
Table 38-1
Table 38-1 Effects of Power Supply Configuration Changes
Configuration Change
Redundant to nonredundant
Nonredundant to redundant (both
supplies must be of equal wattage)
Equal wattage power supply is
inserted with redundancy enabled
Equal wattage power supply is
inserted with redundancy disabled
Higher or lower wattage power
supply is inserted with redundancy
enabled
Higher or lower wattage power
supply is inserted with redundancy
disabled
Catalyst 6500 Series Switch Cisco IOS Software Configuration Guide—Release 12.1 E
38-2
"Using the CLI to View 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 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 since power capability is unchanged.
•
• System log and syslog messages are generated.
System power is increased to the combined power capability of both 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.
•
The system does not allow you to operate a power supply of different wattage even
•
if the wattage is higher than the installed supply. The inserted supply shuts down.
System log and syslog messages are generated.
•
System power is increased to the combined power capability of both supplies.
•
Modules marked power-deny in the show power oper state field are brought up if
•
there is sufficient power.
Chapter 38 Power Management and Environmental Monitoring
38-3).
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