3Com S7906E - Switch, Руководство по настройке

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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
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.