LLDP is a standard link-layer discovery protocol which can broadcast its capability, IP address, ID, and interface name as TLVs (Type/Length/Value) in LLDP PDUs (Link Layer Discovery Protocol Data Units).
An LLDP PDU includes 4 basic TLVs and several optional TLVs.
Basic TLVs include the Chassis ID, Port ID, TTL and End TLVs.
In L2/L3, you can select the following optional TLVs:
MAC address of the system
Management IP address of the system
The port description of system
The VLAN ID of the port
System capability (e.g. switching, routing)
Configuring the LLDP Mode
LLDP supports 4 modes: TxRx, Tx_only, Rx_only, and Disabled. By default, LLDP is disabled.
In TxRx mode, the system transmits and receives LLDPDUs. In Tx_only, the system only transmits LLDPDUs. In Rx_only, the system only receives LLDPDUs. In Disabled, the system will not transmit or receive any LLDPDUs.
After enabling LLDP, each interface will be in tx_rx mode by default.
You can configure the system as shown below:
Selecting Optional TLVs
Displaying LLDP Information
Configuring Other Parameters
You can configure other parameters, such as advertisement-interval, hold-time-multiplier, reinit-delay, and transmit-delay, in a similar manner.