Reference Guide
168 | Link Layer Discovery Protocol (LLDP)
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There are five types of TLVs (Table 14-1). All types are mandatory in the construction of an LLDPDU
except Optional TLVs. You can configure the inclusion of individual Optional TLVs.
Figure 14-2. LLDPDU Frame
Optional TLVs
The Dell Force10 operating software (FTOS) supports the following optional TLVs:
•
Management TLVs
• IEEE 802.1 and 802.3 Organizationally Specific TLVs
• TIA-1057 Organizationally Specific TLVs
Management TLVs
A Management TLV is an Optional TLVs sub-type. This kind of TLV contains essential management
information about the sender. The five types are described in Table 14-2.
Table 14-1. Type, Length, Value (TLV) Types
Type TLV Description
0 End of LLDPDU Marks the end of an LLDPDU.
1 Chassis ID The Chassis ID TLV is a mandatory TLV that identifies the chassis containing the IEEE
802 LAN station associated with the transmitting LLDP agent.
2 Port ID The Port ID TLV is a mandatory TLV that identifies the port component of the MSAP
identifier associated with the transmitting LLDP agent.
3 Time to Live The Time To Live TLV indicates the number of seconds that the recipient LLDP agent
considers the information associated with this MSAP identifier to be valid.
— Optional Includes sub-types of TLVs that advertise specific configuration information. These
sub-types are Management TLVs, IEEE 802.1, IEEE 802.3, and TIA-1057
Organizationally Specific TLVs.
TLV 1
Chassis ID
Preamble
Start Frame
Delimiter
Destination MAC
(01:80:C2:00:00:0E)
Source MAC
Ethernet Type
(0x88CC)
LLDPDU
Padding
FCS
TLV 2
Port ID
TLV 3
Port Description
TLV 4
System Name
TLV 5
System Description
TLV 6
System Capabilities
TLV 7
Management Addr
TLV 0
End of LLDPDU
TLV 127
Organizationally Specific
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