Cisco Catalyst 3560-X Command Reference Manual page 434

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Catalyst 3750-X and 3560-X Switch Command Reference
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In redundant mode, the largest power supply is removed from the power pool to use as backup power
in case one of the other power supplies fails. The available power budget is the total power minus the
largest power supply. This reduces the available power in the pool for switches and powered devices, but
in case of a failure or an extreme power load, there is less chance of having to shut down switches or
powered devices.
In strict mode, when a power supply fails and the available power drops below the budgeted power, the
system balances the budget through load shedding of powered devices, even if the actual power is less
than the available power. In nonstrict mode, the power stack can run in an over-allocated state and is
stable as long as the actual power does not exceed the available power. In this mode, a powered device
drawing more than normal power could cause the power stack to start shedding loads. This is normally
not a problem because most devices do not run at full power. The chances of multiple powered devices
in the stack requiring maximum power at the same time is small.
In both strict and nonstrict modes, power is denied when there is no power available in the power budget.
This is an example of setting the stack power mode for the stack named power1 to power-shared with
strict power budgeting. All power in the stack is shared, but when the total available power is allotted,
no more devices are allowed power.
Switch(config)# stack-power stack power1
Switch(config-stackpower)# mode power-shared strict
Switch(config-stackpower)# exit
This is an example of setting the stack power mode for the stack named power2 to redundant. The largest
power supply in the stack is removed from the power pool to provide redundancy in case one of the other
supplies fails.
Switch(config)# stack-power stack power2
Switch(config-stackpower)# mode redundant
Switch(config-stackpower)# exit
Command Description
stack-power stack Enters power-stack configuration mode for the power stack.
power stack name
show stack-power Displays power-stack configuration for the stack and switches in the power
stack.
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Chapter 2 Catalyst 3750-X and 3560-X Switch Cisco IOS Commands
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