HP V1910 Switch Series User Manual page 228

Field
FCS
SNAP-encapsulated LLDPDU format
2.
Figure 184 SNAP-encapsulated LLDPDU format
Table 89 Fields in a SNAP encapsulated LLDPDU
Field
Destination MAC address
Source MAC address
Type
Data
FCS
LLDPDUs
LLDP uses LLDPDUs to exchange information. An LLDPDU comprises multiple TLV sequences. Each carries
a specific type of device information, as shown in
Figure 185 LLDPDU encapsulation format
An LLDPDU can carry up 28 types of TLVs. Mandatory TLVs include Chassis ID TLV, Port ID TLV, Time To
Live TLV, and End of LLDPDU TLV. Other TLVs are optional.
TLVs
TLVs are type, length, and value sequences that carry information elements. The type field identifies the
type of information, the length field indicates the length of the information field in octets, and the value
field contains the information itself.
LLDPDU TLVs fall into the following categories:
Description
Frame check sequence, a 32-bit CRC value used to determine the validity of
the received Ethernet frame.
Description
The MAC address to which the LLDPDU is advertised. It is fixed to
0x0180-C200-000E, a multicast MAC address.
The MAC address of the sending port. If the port does not have a MAC
address, the MAC address of the sending bridge is used.
The SNAP-encoded LLDP Ethernet type for the upper layer protocol. It is
0xAAAA-0300-0000-88CC for LLDP.
LLDPDU.
Frame check sequence, a 32-bit CRC value used to determine the validity of
the received Ethernet frame.
Figure
214
185.