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Table 19 Fields in an Ethernet II-encapsulated LLDP frame
Field
Destination MAC address
Source MAC address
Type
Data
FCS
SNAP-encapsulated LLDP frame format
2.
Figure 53 SNAP-encapsulated LLDP frame format
0
Table 20 Fields in a SNAP-encapsulated LLDP frame
Field
Destination MAC
address
Source MAC address
Type
Data
FCS
LLDPDUs
LLDP uses LLDPDUs to exchange information. An LLDPDU comprises multiple TLV sequences, each
carrying a type of device information, as shown in
Figure 54 Mandatory and optional TLVs in an LLDPDU
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 Ethernet type for the upper layer protocol. It is 0x88CC for LLDP.
LLDP data unit (LLDPDU).
Frame check sequence, a 32-bit CRC value used to determine the validity of
the received Ethernet frame.
15
Destination MAC address
Source MAC address
Type
Data = LLDPU
(n bytes)
FCS
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 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.
134
Figure
54.
31
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