lldpctl

displays Link Layer Discovery Protocol information collected by the lldpd daemon

TLDR

Display neighbor data

$ sudo lldpctl

Display help

$ lldpctl --help

lldpctl displays Link Layer Discovery Protocol (LLDP) information collected by the lldpd daemon. LLDP is used by network devices to advertise their identity, capabilities, and neighbors on a local network.

PARAMETERS

-f FORMAT

Output format: plain, xml, json, keyvalue

-a

Show all interfaces including hidden

-C PATTERN

Configure specific settings

-L LOCATION

Set location information

-h, --help

Display help information

INSTALL

sudo apt install lldpd

sudo dnf install lldpd

sudo pacman -S lldpd

sudo apk add lldpd

sudo zypper install lldpd

brew install lldpd

nix profile install nixpkgs#lldpd

CAVEATS

Requires lldpd daemon to be running. Root privileges needed for full functionality.

HISTORY

LLDP was standardized as IEEE 802.1AB in 2005 as a vendor-neutral discovery protocol, replacing proprietary protocols like Cisco CDP.