Reference Guide

Figure 21. LLDPDU Frame
Optional TLVs
The Dell Networking Operating System (OS) supports the following optional TLVs: Management TLVs,
IEEE 802.1 and 802.3 organizationally specific TLVs, and 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.
Organizationally Specific TLVs
A professional organization or a vendor can define organizationally specific TLVs. They have two
mandatory fields (as shown in the following illustration) in addition to the basic TLV fields.
• Organizationally Unique Identifier (OUI)—a unique number assigned by the IEEE to an organization or
vendor.
• OUI Sub-type—These sub-types indicate the kind of information in the following data field. The sub-
types are determined by the owner of the OUI.
Figure 22. Organizationally Specific TLVs
LLDP Operation
On an Aggregator, LLDP operates as follows:
• LLDP is enabled by default.
• LLDPDUs are transmitted and received by default. LLDPDUs are transmitted periodically. The default
interval is 30 seconds.
Link Layer Discovery Protocol (LLDP)
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