Figure 12-7 Structure Of A Lldpdu; Figure 12-8 Structure Of A Tlv Packet; Table 12-1 Tlv Types - Raisecom ISCOM2600G-HI (A) Series Configuration Manual

Raisecom
ISCOM2600G-HI (A) Series Configuration Guide
LLDP packet
The LLDP packet is used to encapsulate LLDPDU Ethernet packet in data unit and
transmitted by multicast.
LLDPDU is the data unit of LLDP. The device encapsulates local information in TLV before
forming LLDPDU, then several TLV fit together in one LLDPDU and encapsulated in
Ethernet data for transmission.
As shown in Figure 12-7, LLDPDU is made by several TLV, including 4 mandatory TLV and
several optional TLV.

Figure 12-7 Structure of a LLDPDU

As shown in Figure 12-8, each TLV denotes a piece of information at local. For example, the
device ID and interface ID correspond with the Chassis ID TLV and Port ID TLV respectively,
which are fixed TLVs.

Figure 12-8 Structure of a TLV packet

Table 12-1 lists TLV types. At present only types 0–8 are used.

Table 12-1 TLV types

0
1
2
3
4
5
6
7
8
Organization-defined TLVs are optional TLVs and are advertised in the LLDPDU as required.
Table 12-2 and Table 12-3 list common organization-defined TLVs.
TLV type
End Of LLDPDU
Chassis ID
Interface number
Time To Live
Interface description
System name
System description
System capabilities
Management address
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Description
12 System management
Optional/Required
Required
Required
Required
Required
Optional
Optional
Optional
Optional
Optional
501