pi@fwipt01 ~ $ sudo apt install vlan

pi@fwipt01 ~ $ cat /etc/dhcpcd.conf | sed  '/^#/d' | sed '/^$/d'

hostname
clientid
persistent
option rapid_commit
option domain_name_servers, domain_name, domain_search, host_name
option classless_static_routes
option interface_mtu
require dhcp_server_identifier
slaac private
interface eth0
static ip_address=172.20.0.141/24
static routers=172.20.0.1
static domain_name_servers=192.168.1.1 8.8.8.8
interface eth1
static ip_address=192.168.1.254/24
static routers=192.168.1.1
static domain_name_servers=192.168.1.1 8.8.8.8

pi@idefix10:~ $ cat /etc/network/interfaces.d/vlans
auto eth0.10
iface eth0.10 inet manual
  vlan-raw-device eth0

auto eth0.2
iface eth0.2 inet manual
  vlan-raw-device eth0

auto eth0.3
iface eth0.3 inet manual
  vlan-raw-device eth0