Cisco Catalyst 4500 Series Software Configuration Manual page 563

Chapter 14 Environmental Monitoring and Power Management
Command
Step 1
Switch# configure terminal
Step 2
Switch(config)# power redundancy-mode redundant
Step 3
Switch(config)# end
Step 4
Switch# show power supplies
The following example shows how to set the power management mode to redundant mode:
Switch (config)# power redundancy-mode redundant
Switch (config)# end
Switch#
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#
An option in the combined mode provides a form of redundancy available with only the 4200 W AC and
6000 W AC power supplies. Refer to the section "Combined Mode Power Resiliency" on page 19.
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 has no power redundancy.
To effectively use combined mode, follow these guidelines:
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To configure combined mode on your Catalyst 4500 series switch, perform this task:
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 utilizes 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.
If you have the power management mode set to combined mode and only one power supply installed,
your switch accepts 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 Table 14-5 on page 14-14
The maximum available power for chassis and PoE for each power supply are listed in
on page 14-14.
Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
Purpose
Enters configuration mode.
Sets the power management mode to
redundant mode.
Exits configuration mode.
Verifies the power redundancy mode for
the switch.
for more information.
Power Management
Table 14-5
14-13