Configuring Perpetual PoE and Fast POE

Restrictions for Perpetual and Fast PoE

The following restrictions apply to perpetual and fast PoE:

  • Configuration of Fast PoE or Perpetual PoE has to be done before physically connecting any endpoint. Alternatively do a manual shut/no-shut of the ports drawing power.

  • Power to the ports will be interrupted in case of PSE firmware upgrade and ports will be back up immediately after the upgrade.

  • The CREE light powered device (PD) may flap at regular intervals if not configured with IP assigned from the DHCP server.

Information About Perpetual PoE

Perpetual PoE provides uninterrupted power to connected powered device even when a power sourcing equipment (PSE) switch is starting after a reload from executing the Cisco IOS software reload command.


Caution
Power to the ports will be interrupted in case of M3 or PSE firmware upgrade, and power to the ports will be backed up after Cisco IOS software starts.

Fast POE

This feature switches on power without waiting for IOS to boot up. When poe-ha is enabled on a particular port, the switch on a recovery after power failure, provides power to the connected endpoint devices within short duration before even the IOS forwarding starts up.

Configuring Perpetual and Fast PoE

To configure perpetual and Fast PoE, perform the following steps.

Procedure

  Command or Action Purpose

Step 1

enable

Example:


Device> enable

Enables privileged EXEC mode.

Enter your password, if prompted.

Step 2

configure terminal

Example:


Device# configure terminal

Enters global configuration mode.

Step 3

interface interface-id

Example:


Device(config)# interface gigabitethernet 1/1

Specifies the physical port to be configured, and enters interface configuration mode.

Step 4

power inline port perpetual-poe-ha

Example:


Device(config-if)# power inline port perpetual-poe-ha

Configures perpetual PoE. When you configure perpetual PoE on a port connected to a powered device, the powered device remains powered on during reload.

Step 5

power inline port poe-ha

Example:


Device(config-if)# power inline port poe-ha

Configures Fast PoE. When you configure Fast PoE, if the switch is power cycled, PD device powers on within 50-60 seconds of plugging into a power source without waiting for IOS to boot up.

Step 6

end

Example:


Device(config-if)# end

Returns to privileged EXEC mode.

Example: Configuring Perpetual and Fast PoE

This example shows how you can configure perpetual PoE on a switch:

Device> enable
Device# configure terminal
Device(config)# interface gigabitethernet1/1 
Device(config-if)# power inline port perpetual-poe-ha
Device(config-if)# end

This example shows how you can configure fast PoE on the switch:

Device> enable
Device# configure terminal
Device(config)# interface gigabitethernet1/1 
Device(config-if)# power inline port poe-ha
Device(config-if)# end