46
Understanding Priority Disconnect
Priority disconnect is used by the system software in determining whether an incoming PD will be
granted or denied power when there are too few watts remaining in the PoE power budget for an
additional device. For example, if there are only 2 watts available in the current PoE power budget and
a user plugs a 3.5W powered device into a PoE port, the system software must determine whether the
device will be powered on.
Based on priority disconnect rules, in some cases one or more existing devices may be powered down in
order to accommodate the incoming device. In other cases, the incoming device will be denied power.
Priority disconnect rules involve the port priority status of an incoming device (i.e., low, high, and
critical), as well as the port’s physical port number. Understanding priority disconnect rules is especially
helpful in avoiding power budget deficits and the unintentional shutdown of mission-critical
devices when PDs are being added in tight power budget conditions.
Reminder. Priority disconnect applies only when there is inadequate power
remaining in the power budget for an incoming device.
For information on setting the priority disconnect status, refer to the section below. For information on
setting the port priority status (a separate function from priority disconnect), refer to “Setting Port
Priority Levels” on page 45.
Setting Priority Disconnect Status
By default, priority disconnect is enabled in the switch’s system software. For information on changing
the priority disconnect status, refer to the information below.
Disabling Priority Disconnect
When priority disconnect is disabled and there is inadequate power in the budget for an additional
device, power will be denied to any incoming PD, regardless of its port priority status (i.e., low, high,
and critical) or physical port number.
To disable priority disconnect, use the lanpower slot priority-disconnect command. For example:
-> lanpower slot 2/1 priority-disconnect disable
Enabling Priority Disconnect
To enable priority disconnect, use the lanpower slot priority-disconnect command. For example:
-> lanpower slot 2/1 priority-disconnect enable
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