Controlling PoE allocation
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.
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.
usage |
(Default) 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 following table. |
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.
Power 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