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User Manual
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52
7
LLDP
7.1
Parameters Configuration
At present, network device’s types are increasing and their configurations are
complex, a standard information communication platform is needed in order to make
devices from different manufacturers find and exchange system and configuration
information with each other in the network.
LLDP (Link Layer Discovery Protocol) is created under such background, it provides a
standard way of Link Layer Discovery, which can organize the main power,
management address, device id, interface identification into different TLV
(Type/Length/Value), and encapsulate them in LLDPDU (Link Layer Discovery
Protocol Data Unit) and publish them to the neighbors that
connect to itself directly.
After receiving the Information, the neighbor saves them in the form of standard MIB
(Management Information Base) for the network Management system to query and
judge the communication status of link.
LLDP message sending mechanism
When LLDP function is enabled, the device would periodically send LLDP message to
neighbor device. If
device’s local configuration has changed, it would send LLDP
message immediately to inform neighbor devices of changes in local information. For
preventing abounding LLDP sending caused by frequent changes of local information,
next message should be delayed to send out after sending a LLDP message.
LLDP message receiving mechanism
When enabling LLDP function, the device will check the validity of the received LLDP
message and the TLV(Type/Length/Value) carried by it. After checking, the neighbor
information will be saved in the local device, and the aging time of neighbor
information in the local device will be set according to the TTL(Time To Live) Value