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maximum-power (Interface)

Syntax

Hierarchy Level

Description

Configure the maximum amount of power that the switch can supply to the PoE port. The maximum power configuration is valid when the PoE power management is in static mode. If PoE power management is in class mode, which is the default, the maximum power configuration will have no effect on the power allocation. For more information on power management configuration options, see management.

Note:

Maximum power configuration is not supported in PoE-bt (IEEE 802.3bt).

Note:

A standalone switch’s default setting and range for maximum power does not change if the switch is configured as a satellite device in a Junos Fusion. For instance, an EX4300 switch has a 30W default and a range of 0.0 through 30.0 W when configured as a standalone switch and when it is configured into a satellite device in a Junos Fusion.

Options

watts—The maximum power in watts that can be supplied to the ports.

For EX2200, EX3300, EX4200, EX4300, EX4600, EX6200, and EX8200 switches:

  • Range: 0.0 through 30.0

  • Default: 15.4 W for ports that support IEEE 802.3af and 30 W for ports that support IEEE 802.3at

For EX3200 switches:

  • Range: 0.0 through 18.6

  • Default: 15.4 W

Note:

EX4600 switches support PoE only when operating in a mixed Virtual Chassis with EX4300 switches.

For ACX2000 routers:

  • Range: 1 through 65 W

  • Default: 32 W

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 PoE 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 PoE port on an EX4200 switch to 30 W, but some models of EX4200 switch 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.

If you use the all option to set maximum-power to a value greater than 15.4 W on all interfaces on an EX8200 line card, the maximum power allocated to all ports is 15.4 W.

Note:

Support for a maximum of 18.6 W per port instead of 15.4 W per port on EX3200 switches and P and T models of EX4200 switch requires Junos OS Release 11.1 or later. In addition to requiring an upgrade of Junos OS to Release 11.1 or later, switches that are running an earlier release of Junos OS release require the PoE controller software be upgraded as described in Upgrading the PoE Controller Software. If the controller software is not upgraded and you set maximum-power to a value greater than 15.4 W, the configuration is accepted when you commit it, but the actual power allocated to the port will be 15.4 W.

Note:

On ACX2000 routers, the power sourcing equipment (PSE) delivers up to 65 W per port, provided the management mode is set to high-power mode, by using the high-power option at the [edit poe management] hierarchy level. By default, the management mode is set to static. In the static mode, the PSE can deliver power up to 32 W.

Required Privilege Level

system—To view this statement in the configuration.system-control—To add this statement to the configuration.

Release Information

Statement introduced in Junos OS Release 9.0.

Related Documentation