R0106-HP MSR Router Series Layer 2 - LAN Switching Configuration Guide(V7)

107
Field Descri
p
tion
FCS
Frame check sequence, a 32-bit CRC value used to determine the validity
of the received Ethernet frame.
• LLDP frame encapsulated in SNAP
Figure 34 SNAP-encapsulated LLDP frame
Table 11 Fields in a SNAP-encapsulated LLDP frame
Field
Descri
p
tion
Destination MAC address
MAC address to which the LLDP frame is advertised. It is the same as that
for Ethernet II-encapsulated LLDP frames.
Source MAC address MAC address of the sending port.
Type
SNAP type for the upper-layer protocol. This field is
0xAAAA-0300-0000-88CC for LLDP.
Data LLDPDU.
FCS
Frame check sequence, a 32-bit CRC value used to determine the validity
of the received Ethernet frame.
LLDPDUs
LLDP uses LLDPDUs to exchange information. An LLDPDU comprises multiple TLVs. Each TLV carries a type
of device information, as shown in Figure 35.
Figure 35 LLDPDU encapsulation for
mat
An LLDPDU can carry up to 32 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.
TLVs
A TLV is an information element that contains the type, length, and value fields.
LLDPDU TLVs include the following categories:
• Basic management TLVs
• Organizationally (IEEE 802.1 and IEEE 802.3) specific TLVs