Switch Port Priority - HP ProCurve Planning And Implementation Manual

Operating Rules
External Switch Power
The Switch 2626-PWR has 24 ports and its internal PoE power supply provides
406 watts across all 24 ports. If an HP 600 RPS/EPS or an HP 610 EPS device
is connected to the Switch 2626-PWR for the purpose of supplying external
power to the PoE portion of the switch, there will be either 408 watts or 204
watts of power available should the switch's internal PoE power supply fail.
If a single switch is connected to the EPS ports on the HP 600 RPS/EPS or a
single port of a pair on the HP 610 EPS, 408 watts are available, providing fully
redundant PoE power to the switch. If two switch devices are connected to
the EPS ports on the HP 600 RPS/EPS or to both ports of a pair on the HP 610
EPS, only 204 watts are provided to the switch if the internal PoE power supply
fails.
The Switch 2650-PWR PoE power requirements are different. This switch has
48 ports and the internal PoE power supply supplies 406 watts across all 48
ports. The switch reserves 38 watts for either ports 1-24 or 25-48, so that
neither set of ports receives the entire 406 watts.
By connecting an HP 600 RPS/EPS or an HP 610 EPS to the Switch 2650-PWR,
more PoE power is provided to the switch. With the HP 600 RPS/EPS or the
HP 610 EPS connected to the Switch 2650-PWR, the internal PoE power supply
provides the first 24 ports (1-24) with 406 watts and the HP 600 RPS/EPS or
the HP 610 EPS supplies the second 24 ports (25-48) with 408 or 204 watts (408
watts if only one switch is connected to the EPS ports; 204 watts if two
switches are connected to the EPS ports).
If the internal PoE power supply in the 2650-PWR switch fails, 408 watts or
204 watts are provided to ports 1-48. 38 watts of power are always allocated
to ports 1-25 or 25-48. See page 3-5.

Switch Port Priority

The lower the port number the higher the priority given. For example, port
number one has a higher priority than port number two. Therefore when both
ports need power, port number one is given power priority over port number
two and so on throughout the rest of the ports.
A port can be assigned a power priority that alters the assignment of power
to it by the switch. See the software manual that came with your switch for
details.
2-5