Configuring LLDP LLDP
User Guide
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LLDP
1.1 Overview
LLDP (Link Layer Discovery Protocol) is a neighbor discovery protocol that is used for
network devices to advertise information about themselves to other devices on the
network. This protocol is a standard IEEE 802.1ab defined protocol and runs over the
Layer 2 (the data-link layer) , which allows for interoperability between network devices of
different vendors.
With LLDP enabled, the switch can get its neighbors’ information, and network
administrators can use the NMS (Network Management System) to gather these
information, helping them to know about the network topology, examine the network
connectivity and troubleshoot the network faults.
LLDP-MED (LLDP for Media Endpoint Discovery) is an extension of LLDP and is used to
advertise information between network devices and media endpoints. It is specially used
together with Auto VoIP (Voice over Internet Protocol) to allow VoIP device to access
the network. VoIP devices can use LLDP-MED for auto-configuration to minimize the
configuration effort.
1.2 Supported Features
The switch supports LLDP and LLDP-MED.
LLDP allows the local device to encapsulate its management address, device ID, interface
ID and other information into a LLDPDU (Link Layer Discovery Protocol Data Unit) and
periodically advertise this LLDPDU to its neighbor devices. The neighbors store the
received LLDPDU in a standard MIB (Management Information Base), making it possible
for the information to be accessed by a NMS (Network Management System) using a
management protocol such as the SNMP (Simple Network Management Protocol).
LLDP-MED allows the network device to send its information including Auto VoIP
information, PoE (Power over Ethernet) capacity and more to the media endpoint devices
(for example, IP phones) for auto-configuration. The media endpoint devices receive the
Auto VoIP information and finish the auto-configuration, then send the voice traffic with the
desired configuration, which can provide preferential treatment to the voice traffic.
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