HP 6125XLG Configuration Manual page 243

Figure 68 LLDP neighbor relationships
LLDP frame formats
LLDP sends device information in LLDP frames. LLDP frames are encapsulated in Ethernet II or SNAP
frames.
LLDP frame encapsulated in Ethernet II
•
Figure 69 Ethernet II-encapsulated LLDP frame
Table 15 Fields in an Ethernet II-encapsulated LLDP frame
Field
Destination MAC address
Source MAC address
Type
Data
FCS
Description
MAC address to which the LLDP frame is advertised. LLDP specifies
different multicast MAC addresses as destination MAC addresses for LLDP
frames destined for agents of different types. This helps distinguish
between LLDP frames sent and received by different agent types on the
same interface. The destination MAC address is fixed to one of the
following multicast MAC addresses:
•
0x0180-C200-000E for LLDP frames destined for the nearest bridge
agents.
•
0x0180-C200-0000 for LLDP frames destined for the nearest customer
bridge agents.
•
0x0180-C200-0003 for LLDP frames destined for the nearest TPMR
bridge agents.
MAC address of the sending port.
Ethernet type for the upper layer protocol. It is 0x88CC for LLDP.
LLDPDU. An LLDP frame contains only one LLDPDU.
Frame check sequence, a 32-bit CRC value used to determine the validity
of the received Ethernet frame.
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