Power Over Ethernet
ExtremeWare XOS 11.3 Concepts Guide
170
Reserving Power for a Slot
You reserve power for a given slot. The power reserved for a given slot cannot be used by any other
PoE slots, even if the assigned power is not entirely used.
To reallocate power among the slots, you must reconfigure each slot for the power budget you want; the
power is not dynamically reallocated among PoE modules. You do not have to disable the PoE modules
to reconfigure the power budgets.
To set the budgeted power reserved for all PDs on a given slot, use the following command:
configure inline-power budget <num_watts> slot <slot>
The default power budget is 50 W per slot, and the maximum is 768 W. The minimum reserved power
budget you can configure is 37 W for an enabled slot. If inline power on the slot is disabled, you can
configure a power budget of 0.
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.
To reset the power budget for a PoE module to the default value of 50 W, use the following command:
unconfigure inline-power budget slot <slot>
To display the reserved power budget for the PoE modules, use the following command:
show inline-power slot <slot>
Setting the Disconnect Precedence
NOTE
The switch generates an SNMP event if a PD goes offline, and the port’s state moves from Power to Searching. You
must configure SNMP to generate this event.
When the actual power used by the PDs on a slot exceeds the power budgeted for that slot, the switch
refuses power to PDs. There are two methods used by the switch to refuse power to PDs, and
whichever method is in place applies to all PoE slots in the switch. This is called the disconnect
precedence method, and you configure one method for the entire switch.
The available disconnect precedence methods are:
â—Ź Deny port
â—Ź Lowest priority
The default value is deny port. Using this method, the switch simply denies power to the next PD
requesting power from the slot, regardless of that port’s PoE priority or port number.
Using the lowest priority method of disconnect precedence, the switch disconnects the PDs connected to
ports configured with lower PoE priorities. (Refer to “Configuring the PoE Port Priority” for
information on port priorities.)
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