Connectivity Guide

tlv segment
LAN devices transmit LLDPDUs, which encapsulate TLVs, to neighboring LAN devices. LLDP is a one-way protocol and LAN devices
(LLDP agents) transmit and/or receive advertisements but they cannot solicit and do not respond to advertisements.
There are three mandatory TLVs followed by zero or more optional TLVs and the end of the LLDPDU TLV. The three mandatory TLVs must
be located at the beginning of the LLDPDU in the following order:
• Chassis ID TLV
• Port ID TLV
• Time-to-live TLV
0 — End of
LLDPDU
Marks the end of an LLDPDU.
1 — Chassis ID Identies the LAN agent.
2 — Port ID Identies a port through which the LAN device transmits LLDPDUs.
3 — Time-to-live Number of seconds that the recipient LLDP agent considers the information associated with this MAP identier to
be valid.
— Optional Includes sub-types of TLVs that advertise specic conguration information. These sub-types are management
TLVs, IEEE 802.1, IEEE 802.3, and TIA-1057 organization-specic TLVs.
Optional TLVs
OS10 supports basic TLVs, IEEE 802.1, and 802.3 organizationally-specic TLVs, and TIA-1057 organizationally-specic TLVs. A basic TLV is
an optional TLV sub-type. This kind of TLV contains essential management information about the sender.
A professional organization or vendor denes organizationally-specic TLVs. They have two mandatory elds, in addition to the basic TLV
elds.
Layer 2
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