set vpp settings interface eth0 driver 'dpdk'
set vpp settings unix poll-sleep-usec '120'
set vpp interfaces loopback lo0 kernel-interface 'vpptun0'
set vpp kernel-interfaces vpptun0 address '100.64.0.254/32'

set protocols ospf parameters router-id '100.64.0.254'
set protocols ospf interface eth0 area '0'
set protocols ospf interface vpptun0 area '0'

vyos@vyos-vpp# set protocols ospf interface vpptun0 area '0'

  Incorrect path /sys/class/net/vpptun0: no such file or directory
  
  
  
  Invalid value
  Value validation failed
  Set failed

[edit]
vyos@vyos-vpp#