Cisco Catalyst 4500 Series - Power Management Modes for the Catalyst 4500 Switch

14-9
Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
Chapter 14 Environmental Monitoring and Power Management
Power Management
When you insert power supplies in your switch, use power supplies that are of the same wattage.
Multi-input power supplies such as 1400 W DC triple-input, 4200 W AC, 6000 W AC, and 9000W AC
have additional restrictions. Read the sections on special considerations for these power supplies. If
you mix power supplies, the switch uses the one with the higher wattage and ignores the other power
supply. The power supply status displays as err-disable and the summary displays as all zeros (0) for
wattage values in the output for the show power command.
The following example shows the output for the show power command for mixed power supplies:
Switch# show power
Power Fan Inline
Supply Model No Type Status Sensor Status
------ ---------------- --------- ----------- ------ ------
PS1 PWR-C45-2800AC AC 2800W good good good
PS2 PWR-C45-1000AC AC 1000W err-disable good n.a.
*** Power Supplies of different type have been detected***
Power supplies needed by system :1
Power supplies currently available :1
Power Summary Maximum
(in Watts) Used Available
---------------------- ---- ---------
System Power (12V) 328 1360
Inline Power (-50V) 0 1400
Backplane Power (3.3V) 10 40
---------------------- ----
Total Used 338 (not to exceed Total Maximum Available = 750)
Switch#
Power Management Modes for the Catalyst 4500 Switch
The Catalyst 4500 series switches support two power management modes:
• Redundant mode—Redundant mode uses one power supply as a primary power supply and the
second power supply as a back-up. If the primary power supply fails, the second power supply
immediately supports the switch without any disruption in the network. Both power supplies must
be the same wattage. A single power supply must have enough power to support the switch
configuration.
• Combined mode—Combined mode uses the power from all installed power supplies to support the
switch configuration power requirements. However, combined mode has no power redundancy. If a
power supply fails, one or more modules might shut down.
Note On the Catalyst 4510R switch, the 1000 W AC power supply is not enough to support redundant
mode for all possible configurations. It is able to support redundant mode for limited
configurations that require less than 1050 W.
Note The 1400 W DC power supply supports combined mode for data power. It does not support
combined mode for PoE power.