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12 LINK LAYER DISCOVERY PROTOCOL
This chapter includes the following sections for configuring Link Layer
Discovery Protocol (LLDP):
◆ “Configuring LLDP” on page 87
◆ “LLDP Neighbors” on page 89
CONFIGURING LLDP
The Link Layer Discovery Protocol (LLDP) is used to discover basic
information about neighboring devices on the local broadcast domain. LLDP
is a Layer 2 protocol that uses periodic broadcasts to advertise information
about the sending device. Advertised information is represented in Type
Length Value (TLV) format according to the IEEE 802.1AB standard, and
can include details such as device identification, capabilities and
configuration settings. LLDP also defines how to store and maintain
information gathered about the neighboring network nodes it discovers.
PARAMETERS
The following parameters are displayed on the LLDP Configuration page:
◆ LLDP Status — Enables LLDP on the switch. (Default: Disabled)
◆ Transmission Interval — Configures the periodic transmit interval for
LLDP advertisements. (Range: 5-32768 seconds; Default: 30 seconds)
This attribute must comply with the following rule:
(Transmission Interval * Transmission Hold Time) ≤ 65536,
and Transmission Interval ≥ (4 * Transmission Delay)
◆ Hold Time Multiplier — Configures the time-to-live (TTL) value sent
in LLDP advertisements as shown in the formula below. (Range: 2-10;
Default: 3)
The time-to-live tells the receiving LLDP agent how long to retain all
information pertaining to the sending LLDP agent if it does not transmit
updates in a timely manner.
TTL in seconds is based on the following rule:
(Transmission Interval * Transmission Hold Time) ≤ 65536.
Therefore, the default TTL is 30*3 = 90 seconds.
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