Lldp; Lldp Overview - Zte ZXR10 5900 Series User Manual

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C h a p t e r

LLDP

Table of Contents

LLDP Overview ................................................................ 109

Configuring LLDP ............................................................. 110
LLDP Configuration Example ............................................. 110
LLDP Overview
LLDP Link Layer Discovery Protocol is a new protocol defined in
802.1ab. It makes the adjacent devices send information to each
other to update physical topology information and establish de-
vice management information base. The workflow of LLDP is as
follows:
1. send local device link and management information to adjacent
device;
2. Local device receives adjacent device network management
information;
3. Store adjacent device network management information in lo-
cal device MIB database. Network management software can
query device layer 2 connection status in MIB database.
LLDP is not configuration protocol of remote system or signal con-
trol protocol between ports. LLDP can discover the adjacent de-
vices layer 2 configuration is not same, but it doesn't provide
mechanism to solve the problem, it only reports this problem to
upper layer management device.
In a word, LLDP is a kind of neighbor finding protocol. It defines a
standard for the network devices in the Ethernet such as switch,
router and wireless lan access point. It can announce its existence
to other nodes in the network and save discovery information of
every neighbor device. For example, device configuration, device
ID and other information can be announced by this protocol
LLDP defines a common announcement information set, a trans-
mission announcement protocol and a kind of way to save the
receiving announcement information. The device that need to an-
nounce its information can put multiple pieces of announcement
information into one LLDPDU Link Layer Discovery Protocol Data
Unit to transmit. This LLDPDU contains a sting of variable length
short message units, which is called Type Length Value(TLV). The
description is as follows:
� Type means the information type that need to send;
�
Length means information byte number;
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