Syntax:
Re-enables PoE operation on <
port-list
> and restores the priority setting in effect when PoE was disabled on <port-list
>.The
no
form of the command disables PoE operation on <port-list
>.Default: All PoE ports are initially enabled for PoE operation at Low priority. If you configure a higher priority, this priority is retained until you change it.
|
|
NOTE: For PoE, disabling all ports allows the 22 watts of minimum PoE power or the 38 watts for PoE+ power allocated for the module to be recovered and used elsewhere. You must disable ALL ports for this to occur. |
|
|
The HP switches covered in this guide also support some pre-802.3af devices. For a list of the supported devices, see the FAQ for your switch model.
Syntax:
|
|
NOTE: The default setting for the |
|
|
Syntax:
Reconfigures the PoE priority level on <
port-list
>. For a given level, ports are prioritized by port number in ascending order. For example, if ports 1-24 have a priority level of critical, port 1 has priority over ports 2-24.If there is not enough power available to provision all active PoE ports at a given priority level, the lowest-numbered port at that level is provisioned first. For chassis switches, the lowest-numbered port at that level starting with module A, then B, C, and so on is provisioned. PoE priorities are invoked only when all active PoE ports cannot be provisioned (supplied with PoE power)
Critical
Specifies the highest-priority PoE support for <port-list>
. The active PoE ports at this level are provisioned before the PoE ports at any other level are provisioned.High
Specifies the second priority PoE support for <port-list
>. The active PoE ports at this level are provisioned before theLow
priority PoE ports are provisioned.Low
(Default) Specifies the third priority PoE support for <port-list>
. The active PoE ports at this level are provisioned only if there is power available after provisioning any active PoE ports at the higher priority levels.
PoE priority operation on a PoE module shows some examples of PoE priority configuration.
PoE priority operation on a PoE module
Port | Priority setting | Configuration command[a] and resulting operation with PDs connected to ports C3 through C24 |
---|---|---|
C3 - C17 | Critical |
In this Example:, the following CLI command sets ports C3 to C17 to Critical: HP Switch(config)# interface c3-c17 power-over-ethernet critical The critical priority class always receives power. If there is not enough power to provision PDs on all ports configured for this class, no power goes to ports configured for high and low priority. If there is enough power to provision PDs on only some of the critical-priority ports, power is allocated to these ports in ascending order, beginning with the lowest-numbered port in the class, which, in this case, is port 3. |
C18 - C21 | high |
In this Example:, the following CLI command sets ports C19 to C22 to high: HP Switch(config)# interface c19-c22 power-over-ethernet high The high priority class receives power only if all PDs on ports with a critical priority setting are receiving power. If there is not enough power to provision PDs on all ports with a high priority, no power goes to ports with a low priority. If there is enough power to provision PDs on only some of the high-priority ports, power is allocated to these ports in ascending order, beginning, in this Example:, with port 18, until all available power is in use. |
C22 - C24 | low |
In this Example:, the CLI command sets ports C23 to C24 to low[b]: HP Switch(config)# interface c23-c24 power-over-ethernet low This priority class receives power only if all PDs on ports with high and critical priority settings are receiving power. If there is enough power to provision PDs on only some low- priority ports, power is allocated to the ports in ascending order, beginning with the lowest-numbered port in the class (port 22, in this case), until all available power is in use. |
C1 - C2 | N/A |
In this Example:, the CLI command disables PoE power on ports C1 to C2: HP Switch(config)# no interface c1-c2 power-over-ethernet There is no priority setting for the ports in this Example:. |
[a] For a listing of PoE configuration commands with descriptions, see Configuring PoE operation. [b] In the default PoE configuration, the ports are already set to low priority. In this case, the command is not necessary. |
Syntax:
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 theclass
orvalue
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 Power classes and their values.
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 values
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:
HP Switch(config)# int 6-8 PoE-allocate-by class
You can specify a power level (in watts) allocated for a port by using the value
option. This is the maximum amount of power that will be delivered.
To view the settings, enter the show power-over-ethernet
command, shown in PoE allocation by value and the maximum power delivered.
PoE allocation by value and the maximum power delivered
HP Switch(config)# show power-over-ethernet A6 Status and Counters - Port Power Status for port A7 Power Enable : Yes LLDP Detect : enabled Priority : low Configured Type : AllocateBy : value Value : 15 W Detection Status : Delivering Power Class : 2 Over Current Cnt : 0 MPS Absent Cnt : 0 Power Denied Cnt : 0 Short Cnt : 0 Voltage : 55.1 V Current : 154 mA Power : 8.4 W
If you set the PoE maximum value to less than what the PD requires, a fault occurs, as shown in PoE power value set too low for the PD.
PoE power value set too low for the PD
HP Switch(config)# int A7 poe-value 4 HP Switch(config)# show power-over-ethernet A7 Status and Counters - Port Power Status for port A7 Power Enable : Yes LLDP Detect : enabled Priority : low Configured Type : AllocateBy : value Value : 4 W Detection Status : fault Power Class : 2 Over Current Cnt : 1 MPS Absent Cnt : 0 Power Denied Cnt : 2 Short Cnt : 0 Voltage : 55.1 V Current : 154 mA Power : 8.4 W
You can configure one of the following thresholds:
-
A global power threshold that applies to all ports on the switch. This setting acts as a trigger for sending a notice when the PoE power consumption on any PoE port installed in the switch crosses the configured global threshold level. (Crossing the threshold level in either direction—PoE power usage either increasing or decreasing— triggers the notice.) The default setting is 80%.
Syntax:
This command specifies the PoE usage level (as a percentage of the PoE power available) at which the switch generates a power usage notice. This notice appears as an SNMP trap and a corresponding Event Log message, and occurs when the power consumption crosses the configured threshold value. That is, the switch generates a notice whenever the power consumption either exceeds or drops below the specified percentage of the total PoE power available.
If the switch is configured for debug logging, it also sends the Event Log message to the configured debug destination(s).