HP 6125G HP 6125G & 6125G/XG Blade Switches Layer 2 - LAN Switching Co - Page 204

LLDPDUs, to Live TLV, and End of LLDPDU TLV. Other TLVs are optional.

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Field Source MAC address Type Data FCS Description MAC address of the sending port. If the port does not have a MAC address, the MAC address of the sending bridge is used. Ethernet type for the upper layer protocol. It is 0x88CC for LLDP. LLDPDU. Frame check sequence, a 32-bit CRC value used to determine the validity of the received Ethernet frame. 2. SNAP-encapsulated LLDPDU format Figure 65 SNAP-encapsulated LLDPDU format Table 22 Fields in a SNAP-encapsulated LLDPDU Field Destination MAC address Source MAC address Type Data FCS Description MAC address to which the LLDPDU is advertised. It is fixed at 0x0180-C200-000E, a multicast MAC address. MAC address of the sending port. 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. LLDPDUs LLDP uses LLDPDUs to exchange information. An LLDPDU comprises multiple TLV sequences. Each TLV carries a type of device information, as shown in Figure 66. Figure 66 LLDPDU encapsulation format An LLDPDU can carry up to 28 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. 195

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195
Field
Description
Source MAC address
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
Ethernet type for the upper layer protocol. It is 0x88CC for LLDP.
Data
LLDPDU.
FCS
Frame check sequence, a 32-bit CRC value used to determine the validity of
the received Ethernet frame.
2.
SNAP-encapsulated LLDPDU format
Figure 65
SNAP-encapsulated LLDPDU format
Table 22
Fields in a SNAP-encapsulated LLDPDU
Field
Description
Destination MAC address
MAC address to which the LLDPDU is advertised. It is fixed at
0x0180-C200-000E, a multicast MAC address.
Source MAC address
MAC address of the sending port.
Type
SNAP type for the upper layer protocol. It 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 TLV sequences. Each TLV
carries a type of device information, as shown in
Figure 66
.
Figure 66
LLDPDU encapsulation format
An LLDPDU can carry up to 28 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.