• 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.
Power-sourcing equipment (PSE) detects the power needed by a powered device (PD) before supplying that
power, a detection phase referred to as "searching." If the PSE cannot 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 watts available. For example, if a PSE has a maximum available power of 382 watts and is
already supplying 378 watts, and is then connected to a PD requiring 10 watts, the PSE will not supply power to
the PD.
For PoE+ using Type 2 devices, the PSE must have at least 33 watts available.
Configuration options
In the default configuration, PoE support is enabled on the ports in a PoE module installed on the switch. The
default priority for all ports is low and the default power notification threshold is 80%. Using the CLI, you can:
• Disable or re-enable PoE operation on individual PoE ports
• Enable support for pre-standard devices
• Change the PoE priority level on individual PoE ports
• Change the threshold for generating a power level notice
• 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
NOTE:
The ports support standard networking links and PoE links. You can connect either a non-PoE device
or a PD to a port enabled for PoE without reconfiguring the port.
PD support
To best utilize the allocated PoE power, spread your connected PoE devices as evenly as possible across
modules. Depending on the amount of power delivered to a PoE module, there may or may not always be enough
power available to connect and support PoE operation on all ports in the module. When a new PD connects to a
PoE module and the module does not have enough power left for that port, if the new PD connects to a port "X"
that has a:
• Higher
PoEpriority than another port "Y" that is already supporting another PD, the power is removed from port "Y"
and delivered to port "X." In this case the PD on port "Y" loses power and the PD on port "X" receives power.
• Lower
priority than all other PoE ports currently providing power to PDs, power is not supplied to port "X" until one or
more PDs using higher priority ports are removed.
In the default configuration (usage), when a PD connects to a PoE port and begins operating, the port retains
only enough PoE power to support the PD's operation. Unused power becomes available for supporting other PD
connections. However, if you configure the poe-allocate-by option to either value or class, all of the power
configured is allocated to the port.
86 Aruba 2530 Management and Configuration Guide for
ArubaOS-Switch 16.05
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