ExtremeWare XOS 11.5 supports only the Summit X450 family of switches and the BlackDiamond 8800 series switch.
configure inline-power label ports
Platform Availability
This command is available on the G48P and G48Pe modules installed in the BlackDiamond 8800 series
switch and the Summit X450e-24p switch.
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ExtremeWare XOS 11.5 Command Reference Guide