Quick Reference Guide

124 | Configuring Interfaces
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You can override the default power allocation method by using the CLI to prioritize the delivery of power
to the ports. When the power budget is exceeded, the next port attempting to power up causes the port with
the lowest priority to stop delivering power, to allow higher priority ports to deliver power.
In any case, even if a connected device is not currently drawing power, the port can stay up and pass data.
Conversely, if the port is administratively down (
no shut) or the link goes down, the port can continue to
supply power (no traffic will flow through the port).
The commands are (For details on command syntax, see the PoE section of the System Configuration
chapter in the SFTOS Command Reference):
•
inlinepower {disable | enable}unit-id: In Global Config mode, enable or disable the PoE feature for a
specified switch in an S-Series stack. By default, PoE is enabled.
•
inlinepower threshold 0-100 unit-id: In Global Config mode, configure the percentage of the PoE power
budget allotted for a specified switch in the S-Series stack. See Figure 7-89.
•
inlinepower admin {off | auto}: In Interface Config mode, enable or disable the Power over Ethernet
(PoE) feature on a particular port. By default, PoE is enabled (
auto) on all ports. You need only
connect a PoE-compliant powered device to any copper port for it to receive power, subject to other
constraints, such as the following command.
•
inlinepower priority {critical | high | low}: In Interface Config mode, configure the priority of a port in
terms of its access to power. By default, the priority of a port is set to
low. which allows it to receive
power as long as other ports with higher priorities do not exceed the power budget.
Further, power is supplied according to the physical order of the ports having a particular priority, with port 1/
0/1 having the highest priority and 1/0/48 will having the lowest. So, for example, if ports 1/0/1 and 1/0/48 are
drawing power and are set to low priority when a higher priority device comes online, port 1/0/48 will be the
first to lose power.
•
inlinepower limit 0-20: In Interface Config mode, configure the power limit of the selected port (the
number of watts available to it if PoE is enabled and other ports do not have higher priority access to
the power budget).
•
inlinepower type type-string: In Interface Config mode, enter a power profile description of the port.
Note that this does not affect the Class value that is displayed in the following commands. The S50V
learns the Class value from the powered device. Those values are in the IEEE802.3af specification.
•
show inlinepower [all]: In Privileged Exec mode, display PoE status information for one port or all
ports in the switch. See Figure 7-88.
•
show inlinepower: In User mode, display the status for all switches in a stack that support PoE. See
Figure 7-89.