Configuring power over Ethernet on a port

You can enable PoE, configure dynamic guard band, and set the priority power allocation for a specific port.

The dynamic guard band is set automatically to the expected power of a port before turning on the port. So, when a PoE device is plugged in, the dynamic guard band is set to the maximum power of the device type based on the AF or AT mode. The AF mode DGB is 15.4 W, and the AT mode DGB is 36 W. When the FortiSwitch unit is fully loaded, the dynamic guard band prevents a new PoE device from turning on.

When power to PoE ports is allocated by priority, lower numbered ports have higher priority so that port1 has the highest priority. When more power is needed than is available, higher numbered ports are disabled first.

When power to PoE ports is allocated by first-come, first-served (FCFS), connected PoE devices receive power, but new devices do not receive power if there is not enough power.

If both priority power allocation and FCFS power allocation are selected, the physical port setting takes precedence over the global setting.

When you connect one PoE port to another PoE port, you must connect two PoE switches with fiber. If you have to connect two PoE ports together, you need to disable the PoE function on both ports before inserting the RJ45 cable. For example, use the set poe-status disable command under config switch physical-port for both ports before connecting them.

This section covers the following topics:

• Enabling or disabling PoE in the GUI
• Configuring PoE in the CLI
• Configuring perpetual PoE
• Determining the PoE power capacity
• Resetting the PoE power
• Displaying PoE information

Enabling or disabling PoE in the GUI

1. Go to Switch > Port > Physical.
2. Select a port and then select Edit.
3. For the POE Status, select Enable or Disable.
4. Select a power priority for the port. You can select High Priority, Critical Priority, or Low Priority. If there is not enough power, power is allotted first to Critical Priority ports, then to High Priority ports, and then to Low Priority ports.
5. Select Update.

Configuring PoE in the CLI

config switch physical-port

edit <port>

set poe-status {enable | disable}

set poe-port-mode {IEEE802_3AF | IEEE802_3AT}

set poe-port-priority {critical-priority | high-priority | low-priority}

set poe-pre-standard-detect {disable | enable}

end

Starting in FortiSwitchOS 7.2.2, you can select how a FortiSwitch unit with PoE disconnects from a powered device with the set poe-disconnection-type {AC | DC | DC-delay} command.

• AC—AC disconnect.

• DC—DC disconnect.

• DC-delay—DC disconnect with an extra 500-millisecond delay.

The new command is available on the following FortiSwitch models:

• FS-224D-FPOE
• FS-224E-POE
• FS-248E-FPOE
• FS-248E-POE
• FS-424E-FPOE
• FS-424E-POE
• FS-M426E-FPOE
• FS-448E-FPOE
• FS-448E-POE

PoE pre-standard detection is a global setting for the following FortiSwitch models: FSR-112D-POE, FS-548D-FPOE, FS-524D-FPOE, FS-108D-POE, FS-224D-POE, FS-108E-POE, FS-108E-FPOE, FS-124E-POE, FS-124E-FPOE, 148F-POE, and 148F-FPOE. For the other FortiSwitch PoE models, PoE pre-standard detection is set on each port. Before FortiSwitchOS 7.0.0, poe-pre-standard-detect was set to enable by default. Starting in FortiSwitchOS 7.0.0, poe-pre-standard-detect is set to disable by default.

Configuring perpetual PoE

Starting in FortiSwitchOS 7.2.1, some FortiSwitch PoE models provide perpetual PoE so that a FortiSwitch unit has uninterrupted power while restarting. By default, PoE power is not provided while a FortiSwitch unit restarts.

Refer to the FortiSwitch feature matrix for details about which FortiSwitch models support this feature.

To configure perpetual PoE:

config switch physical-port

edit <PoE_port_name>

set poe-port-power {normal | perpetual | perpetual-fast}

next

end

normal	PoE power is not provided while a switch restarts.
perpetual	PoE power is provided during a soft reboot (switch is restarted while powered up).
perpetual-fast	PoE power is provided during a hard reboot (the switchʼs power is physically turned off and then on again).

Determining the PoE power capacity

Using the GUI:

Go to Switch > Port > Physical. The Power column displays the power capacity for each PoE port.

Using the CLI:

get switch poe inline

Resetting the PoE power

Using the GUI:

1. Go to Switch > Port > Physical.
2. Select a port and then select POE Reset.
3. In the confirmation dialog box, select Reset.

Using the CLI:

execute poe-reset <port>

Displaying PoE information

Using the GUI:

Go to Switch > Port > Physical to see information about each PoE port. Hover over the traffic column to get specific values.

Using the CLI:

diagnose switch poe status <port_name>

The following example displays the information for port 6:

diagnose switch poe status port6

Port(6) Power:4.20W, Power-Status: Delivering Power

Power-Up Mode: Normal Mode

Remote Power Device Type: IEEE802.3AT PD

Power Class: 4

Defined Max Power: 30.0W, Priority:3

Voltage: 54.00V

Current: 71mA