Table 21 Description of the fields in an Ethernet II-encapsulated LLDPDU
Field Description
Destination MAC address
The MAC address to which the LLDPDU is advertised. It is fixed to
0x0180-C200-000E, a multicast MAC address.
Source 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.
Type The Ethernet type for the upper layer protocol. It is 0x88CC for LLDP.
Data LLDP data unit (LLDPDU)
FCS
Frame check sequence, a 32-bit CRC value used to determine the validity of
the received Ethernet frame
2. SNAP-encapsulated LLDPDU format
Figure 58 SNAP-encapsulated LLDPDU format
Table 22 Description of the fields in a SNAP-encapsulated LLDPDU
Field Description
Destination MAC address
The MAC address to which the LLDPDU is advertised. It is fixed to
0x0180-C200-000E, a multicast MAC address.
Source 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.
Type
The SNAP type for the upper layer protocol. It is 0xAAAA-0300-0000-88CC
for LLDP.
Data LLDPDU
FCS
Frame check sequence, a 32-bit CRC value used to determine the validity of
the received Ethernet frame
LLDPDUs
LLDP uses LLDPDUs to exchange information. An LLDPDU comprises multiple type, length, and value (TLV)
sequences. Each TLV carries a type of device information, as shown in Figure 59.
Figure 59 LLDPDU encapsulation format
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