Controlling PoE allocation

The default option for PoE allocation is usage, which is what a PD attached to the port is allocated. You can override this value by specifying the amount of power allocated to a port by using the class or value options.


no int <port-list> poe-allocate-by [usage | class | value]

Allows you to manually allocate the amount of PoE power for a port by either its class or a defined value.


The automatic allocation by a PD


Uses the power ramp-up signature of the PD to identify which power class the device will be in. Classes and their ranges are shown in the table below.

value A user-defined level of PoE power allocated for that port.

The allowable PD requirements are lower than those specified for PSEs to allow for power losses along the Cat-5 cable.

Table 7: Power classes and their values

Power class



Depends on cable type and PoE architecture. Maximum power level output of 15.4 watts at the PSE.This is the default class; if there is not enough information about the load for a specific classification, the PSE classifies the load as class 0 (zero).


Requires at least 4 watts at the PSE.


Requires at least 7 watts at the PSE.


15.4 watts


For PoE+Maximum power level output of 30 watts at the PSE.


To allocate by class for ports 6 to 8:

switch(config)# int 6-8 PoE-allocate-by class