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Enabling PoE on EX Series Switches (CLI Procedure)

Enabling PoE

For EX Series switches that support PoE ports, the factory default configuration enables PoE on the PoE-capable ports, with default settings in effect. You might not have to do any additional configuration if the default settings work for you. See Table 1 for the configurable options and their default settings.

Note:

We recommend that you do not connect an enabled PoE port on one switch to an enabled PoE port on a second switch. If there is a large voltage difference between the power supplies of the two switches, the resulting negative current will trigger a fail-safe mechanism that prevents the power sourcing equipment (PSE) from delivering power to the other PoE ports on that switch.

Note:

On EX8200 switches, the factory default configuration enables PoE on all interfaces starting at Junos OS Release 11.2. Switches that have been upgraded to Release 11.2 from an earlier release might not have PoE enabled by default. To enable PoE on all PoE-capable ports on a switch, use the set poe interface all configuration command.
Note:

EX4600 switches support PoE only in a mixed Virtual Chassis with EX4300 switches. EX4600 switches do not have PoE ports; therefore, the factory default configuration does not enable PoE.
Note:

When connecting any of the EX2300, EX3400, EX4100, EX4100-F, EX4300, EX4300-48MP, EX2300-48MP, or EX4400 switches using network ports to an upstream PoE switch, make sure that PoE is disabled on the upstream switch PoE port, as well as the downlink switch PoE port (if applicable).

Enabling Legacy Powered Device

Starting in Junos OS Release 24.4R1 Junos release, the detection of legacy PD (powered device) is disabled by default in EX4400-24MP, EX4400-48MP, EX4400-48MXP and EX4400-48XP models only.

To enable a legacy PD in a port for these models, apply the legacy-pd knob as shown in the following examples.

  • set poe interface mge-x/y/z legacy-pd (for EX4400-24MP, EX4400-48MP and EX4400-48MXP models)

  • set poe interface ge-x/y/z legacy-pd (for EX4400-48XP)

Note:

  • On any PoE enabled port, PD detection is carried out in real-time. The IEEE standards recommend resistive measurements-based detection for PDs. However, PDs manufactured prior to the IEEE standardization require capacitive measurements-based detection to be performed for a successful detection.

  • legacy-pd knob should not be applied to switch ports that are not connected to any powered device or non-PD capable devices. It is also strongly recommended NOT to use the set poe interface all legacy-pd knob.

Verification Steps:

After the legacy PD is detected and powered on, the device will be shown as non-IEEE against the Operational status detail row in the show poe interface mge-0/0/0 command.

Enabling High Power and Ultra-high Power PoE

Starting in Junos OS Release 18.2R1, on EX4300-48MP switches, you can configure four-pair PoE (PoE-4P) to increase the power delivered to a powered device to 60_W (high power) or 90_W (ultra-high power).

Note:

High power and ultra-high power PoE can be configured for a specific interface, or can be configured globally for all interfaces. For a global configuration, use the all option in place of the interface name.

To configure high power PoE, use the following command:

To configure ultra-high power PoE, use the following command:

Enabling IEEE 802.3-BT PoE

Starting in Junos OS Release 19.3R1, EX4300-48MP switches support IEEE 802.3-BT (PoE-bt). Upgrading to a Junos OS release that supports PoE-bt does not enable PoE-bt by default. To enable PoE-bt, you must upgrade the PoE controller software.

For information on upgrading to PoE-bt, see Upgrading to IEEE 802.3bt PoE.

PoE Configurable Options

Table 1 shows the configurable PoE options and their default settings for the PoE controller and for the PoE interfaces.

Table 1: Configurable PoE Options and Default Settings

Option

Default

Description

PoE Controller Options

guard-band

0 W
Note:

Guard band is not supported in PoE-bt.

Reserves a specified amount of power from the PoE power budget to be used in the case of a spike in PoE power consumption:

  • Up to 15 W on EX6200 and EX8200 switches

  • Up to 19 W on all other switches

lldp-priority

Not included in default configuration

When included in the configuration, assigns interfaces the power priority provided by the connected powered device by using Link Layer Discovery Protocol (LLDP) power negotiation rather than the power priority configured on the switch interface.

Requires LLDP power negotiation to be enabled.

management

class

Sets the PoE power management mode for the switch or line card. The power management mode determines how power to a PoE interface is allocated:

  • class—In this mode, the power allocated to a PoE interface is based on the class of the powered device, and can be further adjusted using LLDP power negotiation. LLDP power negotiation is enabled by default on supported switches when the management option is set to class.

    If LLDP power negotiation is disabled or not supported on the powered device or the switch, the maximum power delivered by an interface is determined by the class of the connected powered device.

    If there is no powered device connected, standard 15.4W power is allocated on the interface.

  • static—The maximum power delivered by an interface is statically configured and is independent of the class of the connected powered device. The maximum power is allocated to the interface even if a powered device is not connected.

    Note:

    Static mode is not supported in PoE-bt.

maximum-power

792 W for the EX8200-2XS-40P (40-port PoE+ with 4-port SFP and 2-port SFP+) line card

915 W for the EX8200-48PL (48-port PoE+ 20 Gbps) line card

1440 W for the EX6200-48P (48-port PoE+) line card
Note:

Not supported in PoE-bt.

(EX6200 and EX8200 switches only) Sets the PoE power budget for the line card:

  • 37 W through 792 W for the EX8200-2XS-40P line card

  • 37 W through 915 W for the EX8200-48PL line card

  • 37 W through 1440 W for the EX6200-48P line card

notification-control

Not included in default configuration

When included in the configuration, enables the PoE controller to send PoE SNMP traps.

Interface Options

af-mode

Not included in default configuration

(EX6200 switches only) When included in the configuration, restricts a PoE interface to supporting IEEE 802.3af only. The maximum power that can be delivered by the PoE interface is 15.4 W.

disable

Not included in default configuration

When included in the configuration, disables PoE on the interface. The interface maintains network connectivity but no longer supplies power to a connected powered device. Power is not allocated to the interface.

maximum-power

30.0 W for interfaces that support PoE+ (IEEE 802.3at)

15.4 W for interfaces that support PoE (IEEE 802.3af)
Note:

Not supported in PoE-bt.

Sets the maximum power that can be delivered by a PoE interface when the power management mode is static:

  • Up to 30 W for EX2200, EX2300, EX3300, EX3400, EX4200, EX4300, EX6200, and EX8200 switches

  • Up to 18.6 W for EX3200 switches

This setting is ignored if the power management mode is class.

Note:

The maximum-power setting permitted by the CLI might be greater than the maximum power a given PoE port can deliver. For example, the CLI permits you to set any port on an EX8200 line card to 30 W; however, only ports 0 through 11 support 30 W. Similarly, the CLI permits you to set any port on an EX4200 switch to 30 W, but some EX4200 models support only 18.6 W per port. If you configure a maximum-power value that is greater than the maximum power supported by a port, the power allocated to the port will be the maximum supported.

priority

low

Sets an interface’s power priority to either low or high. If power is insufficient for all PoE interfaces, the PoE power to low-priority interfaces is shut down before power to high-priority interfaces is shut down. Among interfaces that have the same assigned priority, the power priority is determined by port number, with lower-numbered ports having higher priority.

If LLDP power priority is enabled, the switch assigns each interface the power priority provided by the connected LLDP-enabled powered device rather than the interface’s configured priority.

On EX6200 and EX8200 switches, priority determines the interface’s power priority relative to the other interfaces on the line card, not the interfaces on the switch as a whole. If power management cannot provide the line card with its full PoE power budget, PoE power to interfaces with low priority is shut down first.

telemetries

Not included in default configuration

When included in the configuration, enables the logging of power consumption records on an interface. Logging occurs every 5 minutes for 1 hour unless you specify a different value for interval (Power over Ethernet) or duration.

Related Documentation

Change History Table

Feature support is determined by the platform and release you are using. Use Feature Explorer to determine if a feature is supported on your platform.

Release
Description
19.3R1
Starting in Junos OS Release 19.3R1, EX4300-48MP switches support IEEE 802.3-BT (PoE-bt).
18.2R1
Starting in Junos OS Release 18.2R1, on EX4300-48MP switches, you can configure four-pair PoE (PoE-4P) to increase the power delivered to a powered device to 60_W (high power) or 90_W (ultra-high power).