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Routing & Switching · Foundational

Link Layer Discovery Protocol (LLDP)

IEEE 802.1AB vendor-neutral Layer 2 neighbor discovery protocol using TLVs.

Definition

LLDP advertises chassis ID, port ID, system name, capabilities and management address every 30 seconds with a 120-second hold. LLDP-MED extends it for voice VLAN, PoE and location. Junos enables LLDP; Cisco IOS requires lldp run on many platforms.

Example

lldp run ; show lldp neighbors

Exam tip

Choose LLDP when a multivendor environment needs neighbor discovery.

Related terms