What is Local Link Discovery Protocol (LLDP)?

Local Link Discovery Protocol (LLDP) is a standardized data link layer protocol used to discover and exchange information about network devices. Defined by the IEEE 802.1AB standard, LLDP allows devices to advertise their identity, capabilities, and network topology. It helps network administrators understand device relationships and configurations without manual mapping. LLDP operates similarly to Cisco’s CDP (Cisco Discovery Protocol), but it is vendor-neutral and works across different network vendors’ equipment.

Example Scenario: Enhanced Network Management:

In a manufacturing facility, an HMI and PLC are connected to a managed switch that supports LLDP. The network is composed of various machines and sensors. Also, the network infrastructure is constantly being updated and modified as new equipment is added. With LLDP, the managed switch automatically discovers the devices connected to it, including the HMI and PLC, by receiving their LLDP advertisements.

LLDP Filter Feature:

LLDP Filter is a network feature that controls how LLDP packets are processed on a device. This feature enhances network security by limiting LLDP data exposure to only trusted devices.

Content created by Mike Day