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Cisco 4431 Redundant Power Supply - Shows zero watt usage

joshbibler
Level 1
Level 1

I have a new Cisco 4431 ISR. It was purchased new with only one power supply.

I recently purchased a secondary power supply for reliability. I only want to use it for fault tolerance.

I followed the instructions to install and the unit shows a green light and the fan is working, but when I do the "show power" command it shows both power supplies, but the secondary power supply shows "zero watts".

Is this normal or did I get a bad power supply?

I'm guessing that maybe it only shows used wattage when it's actually in use and it's running idle because the other power supply is caring the load.

I want to test, but this unit carries the entire traffic for our organization and would require an after hours maintenance window.

Any insight? Is there a way to manually transfer power from one supply to the other for testing?

Thanks,

Josh B.

1 Reply 1

Reza Sharifi
Hall of Fame
Hall of Fame

Hi Josh,

When you do a "sh power" are you referring to POE module section? If yes that is the correct behavior. 

The main power supply is taking all the loads.

HTH