Introduction To Lldp - Huawei S9300 Configuration Manual

S9300&S9300E Terabit Routing Switch
Configuration Guide - Network Management

2.1 Introduction to LLDP

The Link Layer Discovery Protocol (LLDP) is a Layer 2 discovery protocol defined in the IEEE
802.1ab standard.
Background
Currently, the Ethernet technology is widely used in the network. Compared with small-scale
networks, large-scale networks require that the network management system (NMS) have more
functions and higher processing capability. For example, the NMS needs to obtain the topology
of connected devices and configuration conflicts between devices.
Currently, many NMSs use the automated discovery function to trace the topology changes.
However, most of them at best analyze the Layer 3 network topology and group devices into
different IP subnets. These NMSs provide only the data concerning the basic events such as
adding or deleting of devices, but do not determine the connected interfaces between devices or
obtain information about configuration conflicts.
The Layer 2 discovery protocol precisely discovers the interfaces on each device and obtains
connection information between devices. In addition, it displays the paths between clients,
switches, routers, application servers, and network servers. The Layer 2 information helps you
quickly know the device topology, detect configuration conflicts between devices, and locate
network faults.
The LLDP protocol is a Layer 2 discovery protocol defined in the IEEE 802.1ab standard.
LLDP working mechanism
Figure 2-1 LLDP diagram
LLDP agent
Local device information
Issue 01 (2012-03-15)
Organizationally
defined local device
LLDP MIB extension
(Optional)
LLDP local system MIB
(
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Organizationally
defined remote device
LLDP MIB extension
(Optional)
LLDP remote system MIB
LLDP frames
)
LLDP/LSAP
Remote device information
2 LLDP Configuration
PTOPO MIB
(Optional)
Entity MIB
(Optional)
Interface MIB
(Optional)
Other MIBs
(Optional)
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