configure lldp ports vendor-specific dot3 power-via-mdi

configure lldp ports [all | port_list] [advertise | no-advertise] vendor-specific dot3 power-via-mdi {with-classification}


Configures the LLDP (Link Layer Discovery Protocol) port to advertise or not advertise Power over Ethernet (PoE) capabilities to its neighbors.

Syntax Description

all Specifies all ports on the switch.
port_list Specifies one or more ports or slots and ports.
advertise Specifies to send the information to neighbors.
no-advertise Specifies not to send the information to neighbors.
with-classification Specifies to use LLDP for Data Link Layer Classification.

This option is available only on PoE+ ports.


No advertise.

Usage Guidelines

When configured, the system includes this TLV. We recommend enabling this TLV only on PoE-capable ports.

The following information is transmitted for LLDP ports with this TLV:
  • Support PoE or not

  • Port class
    • Power sourcing equipment (PSE)

    • Powered device (PD)

  • Power pairs used to supply power
    • Signal

    • Spare

  • Power status

  • Support pairs control or not

  • Power class
    • Class0

    • Class1

    • Class2

    • Class2

    • Class3

    • Class4

Data link layer classification allows fine-grained dynamic re-allocation of power based on changing needs. This feature is enabled by enabling LLDP (transmit and receive) and configuring transmission of the power-via-MDI TLV. The ExtremeXOS software sends an LLDPDU containing a power-via-MDI TLV within 10 seconds of DLL classification being enabled. A PD may request a new power value using an LLDPDU. The allocated power might be changed if a request is received and approved after a power review. The software responds with an allocated power value within 10 seconds of receipt of an LLDPDU with a different requested power from a PD. Power allocation can be controlled to a granularity of 0.1 watts. When DLL classification is enabled, it takes precedence over physical classification.



For more information on advertising power support, see the configure lldp ports vendor-specific med power-via-mdi command.


The following command configures all ports to advertise power capabilities to neighbors:

configure lldp ports all advertise vendor-specific dot3 power-via-mdi


This command was first available in ExtremeXOS 11.2.

Platform Availability

This command is available on the Summit X450-G2, X460-G2, X670-G2, X770, and ExtremeSwitching X440-G2, X620, X690, X870 series switches.