H3C S5120-EI Series, Руководство по эксплуатации

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1-2
Figure 1-1
Ethernet II-encapsulated LLDP frame format
The fields in the frame are described in
Table 1-1 :
Table 1-1
Description of the fields in an Ethernet II-encapsulated LLDP frame
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 LLDP frame format
Figure 1-2
SNAP-encapsulated LLDP frame format
Data = LLDPU
(n bytes)
0
Destination MAC address
Source MAC address
Type
15 31
FCS
The fields in the frame are described in
Table 1-2 :
Table 1-2
Description of the fields in a SNAP-encapsulated LLDP frame
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.