Overview of LLDP Protocol

LLDP (Link Layer Discovery Protocol) is the link layer protocol defined in the IEEE 802.1ab standard. It organizes the information of the local device to TLV (Type/Length/Value), encapsulates in LLDPDU (Link Layer Discovery Protocol Data Unit) and sends to the direct-connected neighbor device. Meanwhile, it saves the LLDPDU received from the neighbor device in the standard MIB (Management Information Base) mode. With LLDP, the device can save and manage its own and direct-connected neighbor device information for the network management system to query and judge the link communication status.