Zte ZXR10 ZSR V2 Configuration Manual (System Management page 141

Chapter 14
LLDP Configuration
Table of Contents
LLDP Overview ........................................................................................................14-1
Configuring LLDP .....................................................................................................14-3
LLDP Configuration Examples..................................................................................14-5
14.1 LLDP Overview
LLDP Introduction
With the wide applications of Ethernet on LAN and Metropolitan Area Network (MAN),
users have higher and higher requirements for Ethernet management ability. At present,
many network management systems use the automatic discovery function to trace the
topology changes. However, most network management systems can only analyze the
network topology up to the network layer. The information, such as the interfaces on a
device, the interfaces connected to other devices, and the paths among clients, network
devices and servers, need to be collected through the link layer. With enough detailed
information, users can locate network faults correctly.
Link Layer Discovery Protocol (LLDP) is a protocol defined by IEEE 802.1AB. Network
management systems can know the topology and changes of L2 networks through LLDP.
LLDP organizes local device information into Type/Length/Value (TLV) and encapsulates
it in a Link Layer Discovery Protocol Data Unit (LLDPDU) to send it to the direct-connected
neighbor. At the same time, LLDP saves the LLDPPDU sent by neighbors in the standard
MIB, so that network management systems can query and determine the communication
states of links.
LLDP Features
LLDP is defined in 802.1AB. As shown in Figure 14-1, LLDP works at the data link layer.
It is a neighbor discovery protocol that defines a standard for Ethernet devices (such as
switches, routers and wireless LAN access points). Through LLDP, an Ethernet device
can advertise its existence to other nodes on the network and save discovery information
of neighbor devices. The device sends the state information to other devices. The
information is stored on each port of all devices. If necessary, the device can send update
information to the neighbor devices that are connected directly, and the neighbor devices
store the information in standard SNMP MIBs.
14-1
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