Figure 14-1 Lldp System Structure - Zte ZXR10 ZSR V2 Configuration Manual (System Management

ZXR10 ZSR V2 Configuration Guide (System Management)

Figure 14-1 LLDP System Structure

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Network management systems can query the L2 connection information in the MIB.
LLDP does not configure or control network elements or traffic. It just reports the
position of L2. Another function defined in 802.1AB is that network management
software can use the information provided by LLDP to find conflicts at L2 network.
At present, IEEE uses the physical topologies, interfaces and entity MISs existing in
IETF.
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A device that supports LLDP must support chassis ID advertisements and port
ID advertisements. Most devices need to support system name advertisements,
system description advertisements and system capability advertisements. System
name advertisements and system description advertisements can provide useful
information to collect network traffic. System description advertisements also can
contain information such as the full name of the device, the type of the system
hardware and the version of the software operating system.
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LLDP information is transmitted periodically and it can only be stored for a period.
IEEE has defined a recommended transmission frequency, about once per 30
seconds. When an LLDP device receives an LLDP packet sent by a neighbor LLDP
device, it stores the information in the CACHE of SNMP MIB defined by IEEE.
The information is invalid during a period. The value of TTL to define the period is
contained in the received packets.
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LLDP makes network management systems be able to discover and simulate physical
network topologies correctly. LLDP devices send and receive advertisements, so the
devices save the information of the discovered neighbor devices. The advertisement
data, such as the management address, device type and port number of a neighbor
device, is helpful to know the type and interconnected interfaces of the neighbor
device.
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