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I fixed it. I'm not sure it was lacked ovs flow entry on network nodes. I deleted all network, router and created again after restarted ovs and neutron services. Then I can see like necessary flow entry which a packet from vxlan route to dhcp port.

# ovs-ofctl dump-flows br-tun | grep output:2
 cookie=0xbbb0b759994638e2, duration=989.074s, table=22, n_packets=2, n_bytes=140, idle_age=981, dl_vlan=1 actions=strip_vlan,set_tunnel:0x24,output:2

# ovs-dpctl show | grep "port 2"
        port 2: tap0b51bcad-62 (internal)

Thank you.