Pd Disconnect Precedence - Extreme Networks ExtremeWare XOS Guide Manual

to the configured inline power budget for the slot (for example, when delivered power from ports
increases or when the configured inline power budget for the slot is reduced).
NOTE
Extreme Networks recommends that you fully populate a single PoE module with PDs until the power usage is just
below the usage threshold, instead of spacing PDs evenly across PoE modules.
Use the following command to reserve the power budget for the PoE module slot:
configure inline-power budget <num_watts> slot <slot>
If you disable a slot with a PoE module, the reserved power budget remains with that slot until you
unconfigure or reconfigure the power budget. Also, you can reconfigure the reserved power budget for
a PoE module without disabling the slot first; you can reconfigure dynamically.
These settings are preserved across reboots and other power-cycling conditions.
The total of all reserved slot power budgets cannot be larger than the total available power to the
switch. If the base module power requirements plus the reserved PoE power for all modules exceeds
the unallocated power in the system, the lowest numbered slots have priority in getting power and one
or more modules in higher-numbered slots will be powered down.
NOTE
PoE modules are not powered-up at all, even in data-only mode, if the reserved PoE power cannot be allocated to
that slot.
To reset the reserved power budget for a slot to the default value of 50 W, use the following command:
unconfigure inline-power budget slot <slot>

PD Disconnect Precedence

After a PD is discovered and powered, the actual power drain is continuously measured, If the usage
for power by PDs is within 19 W of the reserved power budget for the PoE module, the system begins
denying power to PDs.
To supply power to all PDs, you can reconfigure the reserved power budget for the slot, so that enough
power is available to power all PDs. You reconfigure the reserved power budget dynamically; you do
not have to disable the slot to reconfigure the power budget.
You configure the switch to handle a request for power that exceeds the power budget situation in one
of two ways, called the disconnect precedence:
Disconnect PDs according to the configured PoE port priority for each device
●
Deny power to the next PD requesting power, regardless of that port's PoE priority
●
This is a switchwide configuration that applies to each slot; you cannot configure this disconnect
precedence per slot.
The default value is deny-port. So, if you do not change the default value and the slot's power is
exceeded, the next PD requesting power is not connected (even if that port has a higher configured PoE
ExtremeWare XOS 11.1 Concepts Guide
Power Delivery
105