Tp-Link T1600G-28PS (TL-SG2424P) [632/754] Overview

Tp-Link T1600G-28PS (TL-SG2424P) [632/754] Overview
Configuration Guide 610
Configuring LLDP LLDP
1
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 the LLDP feature, network administrators can get the managed network devices’ information
from the switch or the NMS (Network Management System), which can help them know about
the network topology, examine the network connectivity and troubleshoot the network faults.
LLDP-MED (Media Endpoint Discovery) is an extension of LLDP that is used to advertise
information between network devices and media endpoints. It is specially used together with
Voice VLAN to allow VoIP (Voice over Internet Protocol) 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 on the network. The neighbors store the received
LLDPDU in a standard MIB (Management Information Base), making it possible for the information
to be accessed by a Network Management System (NMS) using a management protocol such as
the Simple Network Management Protocol (SNMP).
LLDP-MED allows the network device to send its information including Voice VLAN information,
PoE (Power over Ethernet) capacity and etc. to the media endpoint devices for auto-configuration.
The media endpoint devices (IP phones) receive the Voice VLAN information and finish the auto-
configuration, then send the voice traffic carrying VLAN tag, which can provide preferential
treatment to the voice traffic in the Voice VLAN.

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