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Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
OL-8978-04
Chapter 22 Administering the Switch
Power Management
In a nonredundant configuration, the power that is 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 the previously powered
up modules, the system powers down some modules. These modules are marked as
power-deny
in the
show module
Status field.
You can change the configuration of the power supplies to redundant or nonredundant at any time. If you
switch from a redundant to a nonredundant configuration, both power supplies are enabled (even a power
supply that was disabled because it was of a lower wattage than the other power supply). If you change
from a nonredundant to a redundant configuration, both power supplies are initially enabled, and if they
are of the same wattage, remain enabled. If they are of different wattage, a syslog message displays and
the lower wattage supply is disabled.
Table 22-1
describes how the system responds to changes in the power supply configuration.
Table 22-1
Effects of Power Supply Configuration Changes
Configuration Change
Effect
Redundant to
nonredundant
•
System log and syslog messages are generated.
•
The system power is increased to the combined power capability of
both supplies.
•
The modules marked as
power-deny
in the
show module
Status field
are brought up if there is sufficient power.
Nonredundant to
redundant
•
System log and syslog messages are generated.
•
The system power is the power capability of the larger wattage
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 module
Status field.
Equal wattage power
supply is inserted with
redundancy enabled
•
System log and syslog messages are generated.
•
The system power equals the power capability of one supply.
•
No change in the module status because the power capability is
unchanged.
Equal wattage power
supply is inserted with
redundancy disabled
•
System log and syslog messages are generated.
•
The system power is the combined power capability of both supplies.
•
The modules marked as
power-deny
in the
show module
Status field
are brought up if there is sufficient power.
Higher wattage power
supply is inserted with
redundancy enabled
•
System log and syslog messages are generated.
•
The system disables the lower wattage power supply; the higher
wattage supply powers the system.
Lower wattage power
supply is inserted with
redundancy enabled
•
System log and syslog messages are generated.
•
The system disables the lower wattage power supply; the higher
wattage supply powers the system.
