Link Layer Discovery Protocol (Lldp); 802.1Ab (Lldp) Overview; Protocol Data Units - Dell Force10 Z9000 Configuration Manual

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Link Layer Discovery Protocol (LLDP)

The link layer discovery protocol (LLDP) is supported on Dell Networking OS.

LLDP — defined by IEEE 802.1AB — is a protocol that enables a local area network (LAN) device to advertise its configuration and

receive configuration information from adjacent LLDP-enabled LAN infrastructure devices.

The collected information is stored in a management information base (MIB) on each device, and is accessible via simple network

management protocol (SNMP).

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 59. 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 23. Type, Length, Value (TLV) Types

End of LLDPDU

Marks the end of an LLDPDU.

An administratively assigned name that

identifies the LLDP agent.

Link Layer Discovery Protocol (LLDP)