User's Manual

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function.
40.2.2 Initializing LLDP Reception Mode
Set LLDP to receive-only in the interface mode. In receive-only mode, the interface can receive LLDP
packets from the neighbors and save tlv into the remote MIB. The interface will drop LLDP packets when
disabling the function.
40.2.3 LLDP PDU Packet Structure Description
In accordance with the order, LLDP PDU includes three compulsory TLVs in the front, one or more optional
TLV in the middle and LLDPUD TLV in the end. As shown in figure 1:
M must include TLV.
Figure 1 LLDP PDU Format
(1) Three compulsory TLVs should be listed in sequence at the beginning of LLDP PDU:
1. Chassis ID TLV
2. Port ID TLV
3. Time To Live TLV
(2) Optional TLV selected by the network management can be listed randomly.
4. Port Description
5. System Name
6. System Description
7. System Capabilities
8. Management Address
Three extensions (including DOT1):
9. Port Vlan ID
10. Protocol Vlan ID
11. Vlan Name
12. Protocol Identity
DOT3
13. MAC/PHY Configuration/Status
14. Power Via MDI
15. Link Aggregation
16. Max Frame Size
MED (TLV of MED is not transmitted by default. LLDP packets with MED TLV will be
transmitted only when LLDP packets with MED TLV are received.)
17. MED Capability (TLV is compulsory if MED TLV is added.)
18. Network Policy