Redundant Power Supply Issue

Unanswered Question
Aug 29th, 2008

I was a t a customer site and was presented with an interesting question.

He had Cisco Stackable Non-POE switches in his closets and also was planning to use the RPS to provide redundancy in his closets. He found that if the power went out, the switches indead did fail over to the RPS. But the problem was that when the power came back on, the switches did not fail back to normal power without a reboot of the switch.

He has had the switches for a while so I am not sure what version of code he is on. Is this a known bug and has it been fixed?


Thanks.

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glen.grant Fri, 08/29/2008 - 04:05

Unfortunetly that is normal behavior unless they are the 3750E chassis. It is not a bug...

A little blurb out of a rps doc.


Q. Why does a device continue to draw power from the RPS even after its internal power is restored?

A. This is expected behaviour for all devices, other than the Catalyst E series switches. The device might reboot when reverting back to its own power supply. Hence, it continues to draw power from the RPS, so that the device can be switched back to its own power supply at a convenient time. In order to switch the device back to its own power supply, place the RPS port in "Standby" mode until the device reverts back to its own power supply, then place the RPS port in "Active" mode again. The Catalyst E Series switches are capable of reverting back to their own power supplies without service interruption.

Q. Can a device revert back to its own power supply without rebooting?

A. A Catalyst E Series switch is capable of reverting back to its own power supply without rebooting. All other devices might reboot when reverting back to their own power supplies.

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