PoE/PoE+ Planning and Implementation Guide 2011-09

2-5
Operating Rules
Configuring PoE/PoE+ Power Using the CLI
Switch Priority Class
Using a priority class method, a power priority of Low (the default), High,or
Critical is assigned to each enabled PoE port. This assignment is done through
the command line interface of the switch and alters the hardware port-number
priority for power allocation.
■ Low (default) - This priority class receives power only if all other priority
classes are receiving power. If there is enough power to provision PDs on
only some of the ports with a low priority, then power is allocated to the
ports in ascending order, beginning with the lowest-numbered port in the
class until all available power is in use.
■ High - This priority class receives power only if all PDs on ports assigned
with a critical priority are receiving full power. If there is not enough
power to provision PDs on ports assigned with a high priority, then no
power goes to the low priority ports. If there is enough power to provision
PDs on only some of the high priority ports, then power is allocated to the
high priority ports in ascending order, beginning with lowest-numbered
high priority port, until all available power is in use.
■ Critical - This priority class is the first to be allocated power. If there is
not enough power to provision PDs on all of the ports configured for this
class, then no power goes to “High or Low” priority ports. If there is
enough power to provision PDs on only some of the critical ports, then
power is allocated to the critical ports in ascending order, beginning with
the lowest-numbered port in the class.
For more information, see the Management and Configuration Guide for
your switch at:
www.hp.com/networking/support
Threshold
You can configure one of the following thresholds:
■ A global power threshold that applies to all modules on the switch.
This setting acts as a trigger for sending a notice when the PoE power
consumption on any PoE module installed in the switch crosses the
configured global threshold level. (Crossing the threshold level in
either direction—PoE power usage either increasing or decreasing—
triggers the notice.) The default setting is 80%.
■ A per-slot power threshold that applies to an individual PoE module
installed in the designated slot. This setting acts as a trigger for
sending a notice when the module in the specified slot exceeds or
goes below a specific level of PoE power consumption.