What is LLDP

The Link Layer Discovery Protocol (LLDP) is a standard Layer 2 topology discovery protocol defined in IEEE 802.1ab. LLDP collects local device information including the management IP address, device ID, and port ID, and advertises the information to neighbors. Neighbors save the received information in their management information bases (MIBs). The network management system (NMS) can then use data in MIBs to query link status. LLDP is also used for neighbor discovery and neighbor link status query.

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