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Software Configuration Guide—Release 12.2(25)SG
OL-7659-03
Chapter7 Environmental Moni toring and Power Management
Power Management
The following example shows how to display the current power redundancy mode. The power supplies
needed by system: 1 indicates that the switch is in redundant mode.
Switch# show power supplies
Power supplies needed by system:1
Switch#
Configuring Combined Mode on a Catalyst 4500 Series Switch
If your switch configuration requires more power than a single power supply can provide, set the power
management mode to combined mode. Combined mode utilizes the available power for both power
supplies; however, your switch will have no power redundancy.
To effectively use combined mode, follow these guidelines:
•Use power supplies of the same type and wattage (fixed or variable and AC or DC).
•If you use power supplies with different types or wattages, the switch will utilize only one of the
power supplies.
•For variable power supplies, choose a power supply that provides enough power so that the chassis
and PoE requirements are less than the maximum available power. Variable power supplies
automatically adjust the power resources at startup to accommodate the chassis and PoE
requirements.
•The 1400 W DC power supply does not support combined mode. If y ou set the power budget to 2,
the switch disregards this setting.
•If you have the power management mode set to combined mode and only one power supply insta lled,
your switch will accept the configuration, but power is available from only one power supply.
•When your switch is configured to combined mode, the total available power is not the mathematical
sum of the individual power supplies. The power supplies have a predetermined current sharing ratio
(See Table7-3 on page 7-12 for more information.)
•The maximum available power for chassis and PoE for each power supply are listed in Table 7-3 on
page 7-12.
To configure combined mode on your Catalyst 4500 series switch, perform this task:
Note The power redundancy-mode combined command does not work on a Catalyst 4006 switch.
The following example shows how to set the power management mode to combined mode.
Switch (config)# power redundancy-mode combined
Switch (config)# end
Switch#
Command Purpose
Step1 Switch# configure terminal Enters configuration mode.
Step2 Switch(config)# power redundancy-mode combined Sets the power management mode to
combined mode.
Step3 Switch(config)# end Exits configuration mode.
Step4 Switch# show power supplies Verifies the power redundancy mode for
the switch.