Lang: 
###
### MPLS loopback
###
auto dummy.mpls
iface dummy.mpls inet static
  address 198.19.0.1/32
  pre-up ip link add $IFACE type dummy
  #post-up ip link set up dev $IFACE
  post-down ip link delete dev $IFACE

iface dummy.mpls inet6 static
  address fd45:3282:58e7::2/128