Extreme Networks ExtremeWare XOS 11.3, Manual

Page: 171 / 698

Configuring PoE
ExtremeWare XOS 11.3 Concepts Guide
171
When several ports have the same PoE priority, the lower port numbers have higher PoE priorities. That
is, the switch withdraws power (or disconnects) those ports with the
highest port number(s).
The system keeps dropping ports, using the algorithm you selected with the disconnect ports command,
until the measured inline power for the slot is lower than the reserved inline power.
Use the following command to configure the disconnect precedence for the switch:
configure inline-power disconnect-precedence [deny-port | lowest-priority]
To return the disconnect precedence to the default value of deny port, use the following command:
unconfigure inline-power disconnect-precedence
To display the currently configured disconnect precedence, use the following command:
show inline-power
To reduce the chances of ports fluctuating between powered and non-powered states, newly inserted
PDs are not powered when the actual delivered power for the module is within approximately 19 W of
the configured inline power budget for that slot. However, actual aggregate power can be delivered up
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).
Configuring the PoE Port Priority
You can configure the PoE port priority to be low, high, or critical. The default value is low.
If you configure the disconnect precedence as lowest priority and the PDs request power in excess of
the slot’s reserved power budget, the system allocates power to those ports with the highest priorities
first.
If several ports have the same PoE priority, the lower port numbers have higher PoE priorities. That is,
the switch withdraws power (or disconnects) those ports with the
highest port number(s).
To configure PoE port priority, use the following command:
configure inline-power priority [critical | high | low] ports <port_list>
To reset the port priority to the default value of low, use the following command:
unconfigure inline-power priority ports [all | <port_list>]
To display the PoE port priorities, use the following command:
show inline-power configuration ports <port_list>
Configuring the Usage Threshold
The system generates an SNMP event once a preset percentage of the reserved power for any slot is
actually used by a connected PD. This preset percentage is called the usage threshold and is the
percentage of the measured power to the budgeted power for each slot.