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Power Over Ethernet (PoE/PoE+) Operation
Configuring PoE Operation
Table 11-1. Example of PoE Priority Operation on a PoE Module
Port Priority
Setting
Configuration Command
1
and Resulting Operation
with PDs connected to Ports C3 Through C24
C3 - C17 Critical In this example, the following CLI command sets ports C3-C17 to Critical:
ProCurve(config)# interface c3-c17 power-over-ethernet
critical
The Critical priority class always receives power. If there is not enough power to provision
PDs on all of the ports configured for this class, then no power goes to ports configured for
High and Low priority. If there is enough power to provision PDs on only some of the critical-
priority ports, then power is allocated to these ports in ascending order, beginning with the
lowest-numbered port in the class, which, in this case, is port 3.
C18 - C21 High In this example, the following CLI command sets ports C19-C22 to High:
ProCurve(config)# interface c19-c22 power-over-ethernet high
The High priority class receives power only if all PDs on ports with a Critical priority setting
are receiving power. If there is not enough power to provision PDs on all ports with a high
priority, then no power goes to ports with a low priority. If there is enough power to provision
PDs on only some of the high-priority ports, then power is allocated to these ports in
ascending order, beginning, in this example, with port 18, until all available power is in use.
C22 - C24 Low In this example, the CLI command sets ports C23-C24 to Low
2
:
ProCurve(config)# interface c23-c24 power-over-ethernet low
This priority class receives power only if all PDs on ports with High and Critical priority
settings are receiving power. If there is enough power to provision PDs on only some low-
priority ports, then power is allocated to the ports in ascending order, beginning with the
lowest-numbered port in the class (port 22, in this case), until all available power is in use.
C1 - C2 - n/a - In this example, the CLI command disables PoE power on ports C1-C2:
ProCurve(config)# no interface c1-c2 power-over-ethernet
There is no priority setting for the ports in this example.
1
For a listing of PoE configuration commands, with descriptions, refer to “Configuring PoE Operation” on page 11-8.
2
In the default PoE configuration, the ports are already set to the low priority. In this case, the command is not necessary.
PoE Priority With Two or More Modules
Ports across two or more modules can be assigned a class priority of either
Low (the default), High, or Critical, for example, A5, B7, and C10 could all be
assigned a priority class of Critical. When power is allocated to the ports on a
priority basis, the Critical priority power requests are allocated to module A
first, then Module B, C, and so on. Next, the High priority power requests are
11-10