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CX11x, CX31x, CX710 (Earlier Than V6.03), and CX91x Series Switch Modules V100R001C10 Configuration Guide 12

The documents describe the configuration of various services supported by the CX11x&CX31x&CX91x series switch modules The description covers configuration examples and function configurations.
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LLDP Overview

LLDP Overview

This section describes the definition and purpose of 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 use data in MIBs to query the link status.


An NMS must be capable of managing multiple network devices with diverse functions and complex configurations. Most NMSs can detect Layer 3 network topologies, but they cannot detect detailed Layer 2 topologies or detect configuration conflicts. A standard protocol is required to exchange Layer 2 information between network devices.

The LLDP protocol provides a standard link-layer discovery method. Layer 2 information obtained from LLDP allows the NMS to detect the topology of neighboring devices, and display paths between clients, switches, routers, application servers, and network servers. The NMS can also detect configuration conflicts between network devices and identify causes of network failures. Enterprise users can use an NMS to monitor the link status on devices running LLDP and quickly locate network faults.

Updated: 2019-08-09

Document ID: EDOC1000041694

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