Power Over Ethernet (PoE/PoE+) Operation
PoE Operation
PoE Operation
Using the commands described in this chapter, you can:
■ Enable or disable PoE operation on individual ports.
■ Monitor PoE status and performance per module.
■ Configure a non-default power threshold for SNMP and Event Log
reporting of PoE consumption on either all PoE ports on the switch
or on all PoE ports in one or more PoE modules.
■ Specify the port priority you want to use for provisioning PoE power
in the event that the PoE resources become oversubscribed.
A PSE detects the power needed by a PD before supplying that power, a
detection phase referred to as “searching”. If the PSE can’t supply the required
amount of power, it does not supply any power. For PoE using a Type 1 device,
a PSE will not supply any power to a PD unless the PSE has at least 17 W
available. For example, if a PSE has a maximum available power of 382W and
is already supplying 378W, and is then connected to a PD requiring 10W, the
PSE will not supply power to the PD.
For PoE+ using Type 2 devices, the PSE must have at least 33 W available. A
slot in a zl chassis can provide a maximum of 370 watts of PoE/PoE+ power
to a module.
Configuration Options
In the default configuration, all ports on the PoE module in a ProCurve switch
covered in this guide are configured to support PoE operation. You can:
■ Disable or re-enable per-port PoE operation on individual ports to
help control power usage and avoid oversubscribing PoE resources.
■ Configure per-port priority for allocating power in case a PoE module
becomes oversubscribed and must drop power for some lower-
priority ports to support the demand on other, higher-priority ports.
■ Manually allocate the amount of PoE power for a port by usage, value,
or class.
■ Allocate PoE power based on the link-partner’s capabilities via LLDP.
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