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.
Syntax:
[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.
usage |
The automatic allocation by a PD
|
class |
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. |
|
NOTE: The allowable PD requirements are lower than those specified for PSEs to allow for power losses along the Cat-5 cable.
Power classes and their valuesPower class
|
Value
|
|---|
0
|
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).
|
1
|
Requires at least 4 watts at the PSE.
|
2
|
Requires at least 7 watts at the PSE.
|
3
|
15.4 watts
|
4
|
For PoE+Maximum power level output of 30 watts at the PSE.
|
|
Example:
To allocate by class for ports 6 to 8:
switch(config)# int 6-8 PoE-allocate-by class