lldp dot3-tlv power

Function

The lldp dot3-tlv power command sets the standard to which the 802.3 Power Via MDI TLV sent by an interface conforms.

The undo lldp dot3-tlv power command restores the default configuration.

By default, the 802.3 Power Via MDI TLV conforms to 802.1ab.

Format

lldp dot3-tlv power { 802.1ab [ force ] | 802.3at }

undo lldp dot3-tlv power { 802.1ab force | 802.3at }

Parameters

Parameter	Description	Value
802.1ab	Indicates that the 802.3 Power Via MDI TLV sent by the interface conforms to 802.1ab.	-
802.3at	Indicates that the 802.3 Power Via MDI TLV sent by the interface conforms to 802.3at.	-
force	Indicates that the 802.3 Power Via MDI TLV sent by the interface must conform to 802.1ab.	-

Views

Ethernet interface view, GE interface view, XGE interface view, 25GE interface view, MultiGE interface view, 40GE interface view, 100GE interface view, port group view

Default Level

2: Configuration level

Usage Guidelines

Usage Scenario

The 802.3 Power Via MDI TLV has the following formats:

802.1ab format: [ TLV type | TLV information string length | 802.3 OUI | MDI power support | PSE power pair | power class ]
802.3at format: [ TLV type | TLV information string length | 802.3 OUI | MDI power support | PSE power pair | power class | type/source/priority | PD requested power value | PSE allocated power value ]

Based on 802.1ab, 802.3at extends three fields: type/source/priority, PD requested power value, and PSE allocated power value.

If a PD requires higher power than the PoE switch can supply, run the lldp dot3-tlv power 802.1ab force command to specify that 802.3 Power Via MDI TLV sent by the interface must conform to 802.1ab, so as to reduce the power required by the PD.

Prerequisites

LLDP has been enabled globally using the lldp enable command.
LLDP has been enabled on the interface using the lldp enable command.

Precautions

Before selecting a format of the 802.3 Power Via MDI TLV, you must know the TLV format supported by the neighbors. The TLV format on the local device must be the same as that on the neighbors. You are advised to retain the default configuration of the switch. That is, interfaces send 802.3 Power Via MDI TLV conforming to 802.1ab. The switch can then adapt to 802.3 Power Via MDI TLV conforming to 802.1ab or 802.3at based on the remote device and correctly communicates with the remote device.

An Ethernet interface supports the lldp dot3-tlv power command no matter whether it works in Layer 2 or Layer 3 mode.

An interface that is already configured with the poe power auto-neg enable command do not support the lldp dot3-tlv power 802.1ab force and lldp dot3-tlv power 802.3at commands.

Example

# Configure the interface to send the 802.3 Power Via MDI TLV conforming to 802.3at.

<HUAWEI> system-view
[HUAWEI] interface gigabitethernet 0/0/1
[HUAWEI-GigabitEthernet0/0/1] lldp dot3-tlv power 802.3at