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Figure 8. Power Share Mode
In the following scenario, the Cisco StackPower technology aggregates three power supplies on four switches
(1100W + 1100W + 1100W + 0W = 3300W). The load requirement is 500W per switch (500W + 500W + 500W +
500W = 2000).
Figure 9. Power sharing among 4 Switches
Power budget is 3300W
Allocated power is 2000W
Available unallocated power is 1300W
Should power requirements increase in any of the switches of the power stack, the Cisco StackPower feature can
redirect power from the unallocated power pool to any port in any switch in the stack; power can be drawn from the
unallocated pool until it is completely depleted. Once the power budget is depleted, all power requests will be
denied.
Notice that not all switches have a power supply. StackPower is capable of sharing power even with switches that
don’t have a power supply.