Configuration manual

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.
• LLDPDU information received from a neighbor expires after the default Time to Live (TTL) value: 120
seconds.
• Dell Networking OS supports up to eight neighbors per interface.
• Dell Networking OS supports a maximum of 8000 total neighbors per system. If the number of
interfaces multiplied by eight exceeds the maximum, the system does not configure more than 8000.
Link Layer Discovery Protocol (LLDP)
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