lldpd 1.0.12 Locate neighbors of your network equipment
The Link Layer Discovery Protocol (LLDP) is an industry standard protocol designed to supplant proprietary Link-Layer protocols such as EDP or CDP. The goal of LLDP is to provide an inter-vendor compatible mechanism to deliver Link-Layer notifications to adjacent network devices.
lldpd is an implementation of LLDP. It also supports some proprietary protocols.