lldpd

See also: lldpd upstream documentation

The goal of LLDP is to provide an inter-vendor compatible mechanism to deliver Link-Layer notifications to adjacent network devices.

An implementation of IEEE 802.1ab

lldpd (Link Layer Discovery Protocol daemon) daemon providing an industry standard protocol designed to supplant proprietary Link-Layer protocols such as Extreme's EDP (Extreme Discovery Protocol) and CDP (Cisco Discovery Protocol).

LLDP frames are link-local frames, do not use any network interfaces other than the ones that achieve a link with its link partner, and the link partner being another networking device. Do not use bridge,VLAN, or DSA conduit interfaces.

Example /etc/config/lldpd, start lldpd on all interfaces:

config lldpd config
       # lldp defaults to listening on all interfaces
       # Set class of device
       option lldp_class 4
       # if empty, the distribution description is sent
       option lldp_description "OpenWrt System"

daemon must be running for lldpcli to work

View neighbors across each enabled interface.

lldpcli show neighbors

Get statistics about which interfaces are sending/receiving LLDP frames:

lldpcli show statistics

- lldpd unable to receive frames on mediatek due to bug: https://github.com/openwrt/openwrt/issues/13788