Management and Configuration Guide K/KA/KB.15.15

About configuring PoE operation
In the default configuration,PoE support is enabled on the ports in a PoE module installed on the
switch. The default priority for all ports is low and the default power notification threshold is 80%.
Using the CLI, you can:
• Disable or re-enable PoE operation on individual PoE ports.
• Enable support for pre-standard devices.
• Change PoE priority level on individual PoE ports.
• Change the threshold for generating a power level notice.
• Manually allocate the amount of PoE power for a port by usage, value, or class.
• Allocate PoE power based on the link-partner's capabilities via LLDP.
For a given level, ports are prioritized by port number in ascending order. For example, if ports
A1 to A24 have a priority level of critical, port A1 has priority over ports A2 to A24.
If there is not enough power available to provision all active PoE ports at a given priority level,
the lowest-numbered port at that level is provisioned first. For chassis switches, the lowest-numbered
port at that level starting with module A, then B, C, and so on is provisioned. PoE priorities are
invoked only when all active PoE ports cannot be provisioned (supplied with PoE power.)
In chassis switches, you can use one command to set the same priority level on PoE ports in multiple
modules. For example, to configure the priority to High for ports c5 to c10, C23 to C24, D1 to
D10, and D12, you could use this command:
(HP_Switch_name#) interface c5-c10,c23-c24,
d1-d10,d12 power-over-ethernet high
Example
Suppose that you configure the PoE priority for a module in slot C as shown in Table 8 (page 126).
Table 8 PoE priority operation on a PoE module
Configuration command and resulting operation with PDs connected to ports C3 through
C24
Priority settingPort
In this example, the following CLI command sets ports C3 to C17 to Critical:CriticalC3 - C17
(HP_Switch_name#) 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 ports configured for this class, 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, 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.
In this example, the following CLI command sets ports C19 to C22 to high:highC18 - C21
(HP_Switch_name#) 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, 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, power is allocated to
these ports in ascending order, beginning, in this example, with port 18, until all
available power is in use.
In this example, the CLI command sets ports C23 to C24 to low
1
:lowC22 - C24
(HP_Switch_name#) 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
126 Power Over Ethernet (PoE/PoE+) Operation