HP 5120 EI Series Lan Switching Configuration Manual page 197

Field
Source MAC address
Type
Data
FCS
SNAP-encapsulated LLDPDU format
2.
Figure 65 SNAP-encapsulated LLDPDU format
Table 22 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 TLV
carries a type of device information, as shown in
Figure 66 LLDPDU encapsulation format
An LLDPDU can carry up to 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.
Description
MAC address of the sending port. If the port does not have a MAC address,
the MAC address of the sending bridge is used.
Ethernet type for the upper layer protocol. It is 0x88CC for LLDP.
LLDPDU.
Frame check sequence, a 32-bit CRC value used to determine the validity of
the received Ethernet frame.
Description
MAC address to which the LLDPDU is advertised. It is fixed at
0x0180-C200-000E, a multicast MAC address.
MAC address of the sending port.
SNAP 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
188
66.