Bedienungsanleitung TP-LINK TL-SG2216 (Seite 153 von 183) (Englisch)

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Chapter 13 LLDP

Note:

Only TL-SG2424P supports LLDP function.

LLDP (Link Layer Discovery Protocol) is a Layer 2 protocol that is used for network devices to

advertise their own device information periodically to neighbors on the same IEEE 802 local area

network. The advertised information, including details such as device identification, capabilities

and configuration settings, is represented in TLV (Type/Length/Value) format according to the

IEEE 802.1ab standard, and these TLVs are encapsulated in LLDPDU (Link Layer Discovery

Protocol Data Unit). The LLDPDU distributed via LLDP is stored by its recipients in a standard MIB

(Management Information Base), making it possible for the information to be accessed by a

Network Management System (NMS) using a management protocol such as the Simple Network

Management Protocol (SNMP).

An IETF Standard MIB, as well as a number of vendor specific MIBs, have been created to

describe a network's physical topology and associated systems within that topology. However,

there is no standard protocol for populating these MIBs or communicating this information among

stations on the IEEE 802 LAN. LLDP protocol specifies a set. The device running LLDP can

automatically discover and learn about the neighbors, allowing for interoperability between the

network devices of different vendors. This protocol allows two systems running different network

layer protocols to learn about each other.

LLDP-MED (Link Layer Discovery Protocol for Media Endpoint Devices) is an extension of LLDP

intended for managing endpoint devices such as Voice over IP phones and network switches. The

LLDP-MED TLVs advertise information such as network policy, power via MDI, inventory

management, and device location details.

The LLDP and LLDP-MED information can be used by SNMP applications to simplify

troubleshooting, enhance network management, and maintain an accurate network topology.

 LLDPDU Format

Each LLDPDU includes an ordered sequence of three mandatory TLVs followed by one or more

optional TLVs plus an End of LLDPDU TLV, as shown in the figure below. Chassis ID TLV, Port ID

TLV, TTL TLV and End TLV are the four mandatory TLVs for a LLDPDU. Optional TLVs provide

various details about the LLDP agent advertising them and they are selected by network

management.

The maximum length of the LLDPDU shall be the maximum information field length allowed by the

particular transmission rate and protocol. In IEEE 802.3 MACs, for example, the maximum

LLDPDU length is the maximum data field length for the basic, untagged MAC frame (1500

octets).

 LLDP Working Mechanism

1) LLDP Admin Status

The transmission and the reception of LLDPDUs can be separately enabled for every port, making

it possible to configure an implementation to restrict the port either to transmit only or receive only,

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