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Dell EMC Configuration Guide for the S3100 Series 9.14.2.4

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Protocol Data Units

Configuration information is exchanged in the form of Type, Length, Value (TLV) segments.

  • Type — The kind of information included in the TLV.
  • Length — The value, in octets, of the TLV after the Length field.
  • Value — The configuration information that the agent is advertising.
The chassis ID TLV is shown in the following illustration.
Figure 1. Type, Length, Value (TLV) Segment
Illustration of the type, length, value (TLV) segment.

TLVs are encapsulated in a frame called an LLDP data unit (LLDPDU) (shown in the following table), which is transmitted from one LLDP-enabled device to its LLDP-enabled neighbors. LLDP is a one-way protocol. LLDP-enabled devices (LLDP agents) can transmit and/or receive advertisements, but they cannot solicit and do not respond to advertisements.

There are five types of TLVs. All types are mandatory in the construction of an LLDPDU except Optional TLVs. You can configure the inclusion of individual Optional TLVs.

Table 1. Type, Length, Value (TLV) TypesType, Length, Value (TLV) Types
TypeTLVDescription
0End of LLDPDUMarks the end of a LLDPDU.
1Chassis IDAn administratively assigned name that identifies the LLDP agent.
2Port IDAn administratively assigned name that identifies a port through which TLVs are sent and received.
3Time to LiveAn administratively assigned name that identifies a port through which TLVs are sent and received.
—OptionalIncludes 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.
Figure 2. LLDPDU Frame
Illustration of an LLDPDU frame.

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