Switch Administration Guide

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Technical Documentation > Switch Administration Guide > System Management > Switching > Link Layer Discovery Protocol

Link Layer Discovery Protocol

Link Layer Discovery Protocol (LLDP) is the IEEE 802.1AB standard for Switches to advertise their identity, major capabilities, and neighbors on the 802 LAN. LLDP allows users to views the discovered information to identify system topology and detect faulty configurations on the LAN. LLDP is essentially a neighbor discovery protocol that uses Ethernet connectivity to advertise information to devices on the same LAN and store information about the network. The information transmitted in LLDP advertisements flow in one direction only; from one device to its neighbors. This information allows the device to quickly identify a variety of other devices, resulting in a LAN that interoperates smoothly and efficiently.

LLDP transmits information as packets called LLDP Data Units (LLDPDUs). A single LLDP Protocol Data Unit (LLDP PDU) is transmitted within a single 802.3 Ethernet frame. A basic LLDPDU consists of a set of Type- Length-Value elements (TLV), each of which contains information about the device. A single LLDPDU contains multiple TLVs. TLVs are short information elements that communicate complex data. Each TLV advertises a single type of information.

Global Settings

Select whether to Enable or Disable the LLDP feature on the Switch. Next, enter the Transmission interval, Holdtime Multiplier, Reinitialization Delay parameter, and the Transmit Delay parameter. When finished, click Apply to update the system settings.

State

Select Enabled or Disabled to activate LLDP for the Switch.
LLDP Version Select the required LLDP version. By deafult V2 is selected.

Transmission Interval

Enter the interval at which LLDP advertisement updates are sent. The default value is 30. The range is from 5-32767.

Transmit Hold

Enter the amount of time that LLDP packets are held before packets are discarded and measured in multiples of the Advertised Interval. The default is 4. The range is from 2-10.

Reinitialization Delay

Enter the amount of time of delay before reinitializing LLDP. The default is 2. The range is from 1-10.

Transmit Delay

Enter the amount of time that passes between successive LLDP frame transmissions. The default is 2 seconds. The range is 1-8191 seconds.
Notification Interval It is the time interval in which the local system generates a notification-event. In the specific interval, generating more than one notification-event is not possible.
It is fixed value and unchangeable.
TxCreditMax It is the maximum number of consecutive LLDPDUs that can be transmitted at any time.
It is fixed value and unchangeable.
MessageFastTx It is the interval at which LLDP frames are transmitted on behalf of this LLDP agent during a fast transmission period.
It is fixed value and unchangeable.
TxFastInit It is the value used to initialize the TxFast variable which determines the number of transmissions that are made in fast transmission mode.
It is fixed value and unchangeable.

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