Link Layer Discovery Protocol (LLDP) Feature Overview and Configuration Guide

Link Layer Discovery Protocol (LLDP) enables Ethernet network devices, such as switches and routers, to transmit and/or receive descriptive information, and to store such information learned about other devices.

The data sent and received by LLDP is useful for many reasons:

  • devices can discover neighbors—other devices directly connected to it.
  • devices can use LLDP to advertise some parts of their Layer 2 configuration to their neighbors.
  • some kinds of misconfiguration can be more easily detected and corrected.
  • the LLDP-MED extension provides a level of Plug-and-Play configuration of peripheral devices.

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