linux# apt install cdpr

server# cdpr

[server:~] # pkg install cdpd

[server:~] # sysrc cdpd_enable=yes

[server:~] # service cdpd start 

root@server:~# apt install lldpd

root@server:~# cat /etc/default/lldpd

...
DAEMON_ARGS="-x -c -s -e"

root@server:~# service lldpd restart

switch# show cdp neighbors