set interfaces ethernet eth1 address 192.0.2.1/30
set vpp settings interface eth1 driver 'dpdk'
set vpp interfaces gre gre2 remote '192.0.2.25'
set vpp interfaces gre gre2 source-address '192.0.2.1'
set vpp interfaces gre gre2 kernel-interface 'vpptun12'
set vpp kernel-interfaces vpptun12 address '10.0.0.0/31'
commit

vyos@r14# commit
[ vpp kernel-interfaces vpptun12 ]
Traceback (most recent call last):
  File "/usr/libexec/vyos/services/vyos-configd", line 139, in run_script
    script.apply(c)
  File "/usr/libexec/vyos//conf_mode/vpp_kernel-interfaces.py", line 100, in apply
    i = Interface(ifname)
        ^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/vyos/ifconfig/interface.py", line 341, in __init__
    self._create()
  File "/usr/lib/python3/dist-packages/vyos/ifconfig/interface.py", line 362, in _create
    self._cmd(cmd)
  File "/usr/lib/python3/dist-packages/vyos/ifconfig/control.py", line 64, in _cmd
    return cmd(command, self.debug, env=env)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/vyos/utils/process.py", line 187, in cmd
    raise OSError(code, feedback)
PermissionError: [Errno 1] failed to run command:  ip link add dev vpptun12
returned: 
exit code: 1

[[vpp kernel-interfaces vpptun12]] failed
Commit failed
[edit]
vyos@r14#

Jan 27 20:39:58 r14 vyos-configd[795]: Received message: {"type": "node", "last": true, "data": "VYOS_TAGNODE_VALUE=vpptun12/usr/libexec/vyos/conf_mode/vpp_kernel-interfaces.py"}
Jan 27 20:39:58 r14 vpp[5580]: interface: hw_add_del_mac_address: vnet_hw_interface_add_del_mac_address: Secondary MAC Addresses not supported for interface index 3
Jan 27 20:39:58 r14 vpp[5580]: interface: hw_add_del_mac_address: vnet_hw_interface_add_del_mac_address: Secondary MAC Addresses not supported for interface index 3
Jan 27 20:39:58 r14 vpp[5580]: interface: hw_add_del_mac_address: vnet_hw_interface_add_del_mac_address: Secondary MAC Addresses not supported for interface index 3
Jan 27 20:39:58 r14 vyos-configd[795]: Sending reply: error_code 1 with output
Jan 27 20:39:58 r14 vyos-configd[795]: scripts_called: ['vpp', 'vpp_interfaces_gre_gre2', 'vpp_kernel-interfaces_vpptun12']
Jan 27 20:39:58 r14 systemd[1]: opt-vyatta-config-tmp-new_config_4838.mount: Deactivated successfully.
Jan 27 20:39:59 r14 vpp[5580]: received signal SIGSEGV, PC 0x7fd714b74883, faulting address 0x7fe6d4828ca0
Jan 27 20:39:59 r14 vpp[5580]: #0  0x00007fd7141ad162 0x7fd7141ad162
Jan 27 20:39:59 r14 vpp[5580]: #1  0x00007fd713ecd050 0x7fd713ecd050
Jan 27 20:39:59 r14 vpp[5580]: #2  0x00007fd714b74883 0x7fd714b74883
Jan 27 20:39:59 r14 vpp[5580]: #3  0x00007fd71414ea9b 0x7fd71414ea9b
Jan 27 20:39:59 r14 vpp[5580]: #4  0x00007fd714154045 vlib_main + 0x1195
Jan 27 20:39:59 r14 vpp[5580]: #5  0x00007fd7141ac58a 0x7fd7141ac58a
Jan 27 20:39:59 r14 vpp[5580]: #6  0x00007fd71410995c 0x7fd71410995c
Jan 27 20:39:59 r14 netplugd[1066]: eth1: state INNING flags 0x00011043 UP,BROADCAST,RUNNING,MULTICAST,10000 -> 0x00001002 BROADCAST,MULTICAST
Jan 27 20:39:59 r14 commit[5756]: Successful change to active configuration by user vyos on /dev/pts/2
Jan 27 20:39:59 r14 systemd[1]: vpp.service: Main process exited, code=killed, status=6/ABRT
Jan 27 20:39:59 r14 systemd[1]: vpp.service: Failed with result 'signal'.
Jan 27 20:39:59 r14 systemd[1]: vpp.service: Consumed 4.034s CPU time.
Jan 27 20:40:00 r14 netplugd[5759]: /etc/netplug/netplug eth1 probe -> pid 5759
Jan 27 20:40:00 r14 netplugd[1066]: eth1: can't get flags: No such device
Jan 27 20:40:00 r14 netplugd[1066]: eth1: can't get flags: No such device

set interfaces ethernet eth1 address 192.0.2.1/30
set vpp settings interface eth1 driver 'dpdk'
set vpp interfaces gre gre2 remote '192.0.2.25'
set vpp interfaces gre gre2 source-address '192.0.2.1'
set vpp interfaces gre gre2 kernel-interface 'vpptun12'
commit

set vpp kernel-interfaces vpptun12 address '10.0.0.0/31'
commit

vyos@r14# delete vpp 
[edit]
vyos@r14# commit
[ vpp kernel-interfaces vpptun12 ]
Interface vpptun12 must be created before using in configuration
delete [ vpp kernel-interfaces vpptun12 ] failed
delete [ vpp ] failed
Commit failed
[edit]
vyos@r14#