Determining The Affect Of A Port On The Power Budget; Managing Power Priorities - Dell C9000 Series Networking Configuration Manual

Determining the Affect of a Port on the Power
Budget
The PoE and PoE+ power budget is affected differently depending on how you enable PoE and PoE+ and
whether a device is connected. The following lists these differences.
1 When you configure a port as power inline without setting the max_milliwatts power limit option,
the Dell Networking OS does not allocate any power to the port unless a device is connected and there
is no limit to the amount of power consumed by the powered device.
2 When you configure a port aspower inline with the max_milliwatts power limit option, the Dell
Networking OS does not allocate any power to the port unless a device is connected but restricts the
maximum power that can be consumed by the powered device to the amount set through the
max_milliwatts option.
3 The max_milliwatts option has no effect on a port extender (PE) port when the PE port is configured
to be in Class mode.

Managing Power Priorities

PoE or PoE+ enabled port extender ports have power access priorities based first on the priority configured
and then on their port number.
The default priority is with respect to the port numbers, the lower port numbers have higher priorities when
compared with higher port numbers
You can augment the default prioritization using the [no] power inline {[max_milliwatts] |
priority {critical | high | low}} command, where critical is the highest priority and low is the
lowest priority.
NOTE: If you configure a priority with this command, the Dell Networking OS ignores any LLDP-MED
priority on this port. If you do not configure a port priority with this command, the Dell Networking OS
honors any LLDP-MED priority.
In general, priority is assigned in this order:
1 power inline priority {critical | high | low} setting or priority advertised by LLDP
TLV.power inline mode pe pe—id stack-unit unit-number {class | static} setting:
NOTE: The power inline static setting has a higher priority for access to power than those configured
using the class setting.
2 port number .
NOTE: By default, all ports are set to low priority.
Power over Ethernet (PoE) 875