Lldp - EnGenius EGS5212FP User Manual

LLDP

Link Layer Discovery Protocol (LLDP) is the IEEE 802.1AB
standard for Switches to advertise their identity, major
capabilities, and neighbors on the 802 LAN. LLDP allows
users to views the discovered information to identify
system topology and detect faulty configurations on the
LAN. LLDP is essentially a neighbor discovery protocol
that uses Ethernet connectivity to advertise information
to devices on the same LAN and store information
about the network. The information transmitted in
LLDP advertisements flow in one direction only; from
one device to its neighbors. This information allows the
device to quickly identify a variety of other devices,
resulting in a LAN that interoperates smoothly and
efficiently.
LLDP transmits information as packets called LLDP Data
Units (LLDPDUs). A single LLDP Protocol Data Unit (LLDP
PDU) is transmitted within a single 802.3 Ethernet
frame. A basic LLDPDU consists of a set of Type-
Length-Value elements (TLV), each of which contains
information about the device. A single LLDPDU contains
multiple TLVs. TLVs are short information elements that
communicate complex data. Each TLV advertises a single
type of information.
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