set vpp interfaces gre gre0 remote '192.0.2.2'
set vpp interfaces gre gre0 source-address '192.0.2.1'
set vpp settings interface eth1 driver 'dpdk'
set vpp settings unix poll-sleep-usec '12'

vpp# show int
              Name               Idx    State  MTU (L3/IP4/IP6/MPLS)     Counter          Count     
eth1                              1      up          1500/0/0/0     rx packets                     2
                                                                    rx bytes                     104
                                                                    tx packets                    10
                                                                    tx bytes                    1056
                                                                    drops                          2
gre0                              3      up          9000/0/0/0     
local0                            0     down          0/0/0/0       
tap1                              2      up          9000/0/0/0     rx packets                     9
                                                                    rx bytes                     926
                                                                    ip6                            9
vpp#