PoE operation

Using the commands described in this chapter, you can:
  • Enable or disable PoE operation on individual ports.

  • Monitor PoE status and performance.

  • Configure a non-default power threshold for SNMP and Event Log reporting of PoE consumption on either all PoE ports on the switch or on all PoE ports.

  • Specify the port priority you want to use for provisioning PoE power in the event that the PoE resources become oversubscribed.

A PSE detects the power needed by a connected PD before supplying that power via a phase referred to as "searching". If the PSE cannot supply the required amount of power, it does not supply any power. For PoE using a Type 1 device, a PSE will not supply any power to a PD unless the PSE has at least 17 watts available. For example, if a PSE has a maximum available power of 382 watts and is already supplying 378 watts, and is then connected to a PD requiring 10 watts, the PSE will not supply power to the PD.

For PoE+ using Type 2 devices, the PSE must have at least 33 watts available.