HP 2910AL - Manual (Page 257)

Power Over Ethernet (PoE+) Operation
Configuring PoE Operation
Power Priority Operation
If a PSE can provide power for all connected PD demand, it does not use its
power priority settings to allocate power. However, if the PD power demand
oversubscribes the available power, then the power allocation is prioritized
to the ports that present a PD power demand. This causes the loss of power
from one or more lower-priority ports to meet the power demand on other,
higher-priority ports. This operation occurs regardless of the order in which
PDs connect to the ports enabled for PoE.
There are two ways that PoE power is prioritized:
■ Using a priority class method, a power priority of Low (the default),
High, or Critical is assigned to each enabled PoE port. See “Configuring
the PoE Port Priority Level” on page 11-8.
■ Using a port-number priority method, a lower-numbered port has
priority over a higher-numbered port within the same configured
priority class, for example, port 1 has priority over port 5 if both are
configured with
High priority.
Configuring PoE Operation
In the default configuration, PoE support is enabled on the Gig-T ports. The
default priority for all ports is
Low and the default power notification threshold
is 80 (%). Using the CLI, you can perform the functions shown in table 11-1.
Table 11-1. PoE Functions and Commands
Function Command
Change the PoE priority level on
individual PoE ports interface <port-list> power-over-ethernet
[critical | high | low]
Disable or re-enable PoE operation on
individual PoE ports [no] interface <port-list> power-over-ethernet
Change the threshold for generating a
power level notice power-over-ethernet threshold <1-99>
11-7