Dell Networking S6000 Uživatelský manuál stáhnout pdf (Strana 528)

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Link Layer Discovery Protocol (LLDP)

The link layer discovery protocol (LLDP) is supported on the S6000 platform.

802.1AB (LLDP) Overview

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).

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 66. 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.

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Link Layer Discovery Protocol (LLDP)

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