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Huawei AR150&200 Series Enterprise Routers
Configuration Guide - Network Management
3.1 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 Local Area Network (LAN) and
Metropolitan Area Network (MAN). 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 does 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 3-1 LLDP diagram
LLDP agent
Local device information
Issue 02 (2012-03-30)
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
3 LLDP Configuration
PTOPO MIB
(Optional)
Entity MIB
(Optional)
Interface MIB
(Optional)
Other MIBs
(Optional)
57
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