This is an RPS hardware limitation documented in the Release-notes and this bug: CSCdx81023.
Symptom:
A Catalyst switch might reload when changing from RPS power to internal power.
Conditions:
This can occur on any Catalyst switch connected to one of the following Redundant Power Supplies:
PWR300-AC-RPS-N1
PWR600-AC-RPS
PWR675-AC-RPS-N1
The internal power supply on the Catalyst switch was connected to one power source, and the RPS was connected to the same or different power source as
the switch. The power source connected to the internal power supply failed, causing the RPS to supply power to the switch.
(The power to the RPS did not fail either because that circuit did not fail, the RPS was connected to an Uninterruptible Power Supply (UPS), etc.) After some period of time, the power connected to the internal power supply comes back online, and the mode
button on the RPS is pressed to put the RPS in standby mode. When the switch changes
from RPS power back to the internal power supply, there is a possibility that the switch might reload.
Workaround:
To prevent unscheduled downtime, the switch should be powered off during a maintenance window.
Additional Information:
1. The RPS is a Redundant Power Supply, not an Uninterruptible Power Supply. As documented,
the RPS should be connected to the same power circuit as the switch itself.
2. The RPS is designed to protect from a failure of the internal power supply in a switch, not the failure of a power circuit.
3. This problem might occur on some some switches, might not occur on other switches, and might occur intermittently on the same switch.
4. The switch does NOT reload when switching from the internal power supply to the RPS.
