24.1.1 Overview
LLDP (Link Layer Discovery Protocol) is a protocol to collect information about neighboring devices. The purpose of the functionality provided by the protocol is to make the examination of information about connected devices easier during operation and maintenance.
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(1) LLDP application
LLDP allows a local device to send its own device and port information to the ports of neighboring devices connected to the local device. By managing the received information, the operator at the local device can check the status of connections to neighboring devices.
The figure below shows an example of using LLDP. In this example, the operator of Switch A installed on the 1st floor of a building can check the status of connections to other Switches installed on other floors of the building.
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![[Figure Data]](./GRAPHICS/ZU211010.GIF)