Identify switch port to which the server is connected

# Show LLDP neighbors
networkctl lldp

lldpctl
http://www.panticz.de/lldpd

for NIC in $(find /sys/class/net -type l -not -lname "*virtual*" -printf "%f\n" | sort); do
echo "NIC: ${NIC}"
echo "NIC MAC: $(ethtool -P ${NIC})"
timeout 300 tcpdump -nn -v -i ${NIC} -s 1500 -c 1 "ether[20:2] == 0x2000"
done