Power Over Ethernet (PoE) Operation

Configuring PoE Operation

Configuring the PoE Port Priority Level

Syntax: interface < port-list> power-over-ethernet [ critical high low ]

Reconfigures the PoE priority level on <port-list>. For a given level, ports are prioritized by port number in ascending order. For example, if ports 1-24 have a priority level of critical, port 1 has priority over ports 2-24.

If there is not enough power available to provision all active PoE ports at a given priority level, then the lowest-numbered port at that level will be provisioned first. PoE priorities are invoked only when all active PoE ports cannot be provisioned (supplied with PoE power).

• Critical: Specifies the highest-priority PoE support for <port-list>. The active PoE ports at this level are provisioned before the PoE ports at any other level are provisioned.

• High: Specifies the second priority PoE support for

<port-list>. The active PoE ports at this level are provisioned before the Low priority PoE ports are provisioned.

• Low: (the default): Specifies the third priority PoE support for <port-list>. The active PoE ports at this level are provisioned only if there is power available after provisioning any active PoE ports at the higher priority levels.

 

Table 11-1provides examples of how PoE priority settings impact operation.

Table 11-1. Example of PoE Priority Operation on the HP ProCurve 2520-24-PoE

 

 

Priority

Configuration Command and Resulting Operation

 

Setting

 

 

Critical

This 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” ports, then power is allocated to the “Critical”

 

ports in ascending order, beginning with the lowest-numbered port in the class. For this example, the CLI

 

command to set ports to “Critical” is:

 

ProCurve(config)# interface 1-3 power critical

High

This priority class receives power only if all PDs on ports with a Critical priority setting are receiving full

 

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” ports,

 

then power is allocated to the “High” ports in ascending order until all available power is in use. For this

 

example, the CLI command to set ports to “High” is:

ProCurve(config)# interface 4-7 power high

11-9