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packstack ovs

(https://www.rdoproject.org/networking/neutron-with-existing-external-network/)

I ran packstack with "packstack --allinone --provision-demo=n --os-neutron-ovs-bridge-mappings=extnet:br-ex --os-neutron-ovs-bridge-interfaces=br-ex:eth0 --os-neutron-ml2-type-drivers=vxlan,flat" ,and set OVS / Neutron with https://docs.openstack.org/liberty/networking-guide/scenario-classic-ovs.html ,but I'm getting these errors as OVS not starting among neutron agent-list.

2017-02-20T05:14:43.473Z|00067|rconn|WARN|br-tun<->tcp:127.0.0.1:6633: connection failed (Connection refused)
2017-02-20T05:14:51.473Z|00068|rconn|WARN|br-int<->tcp:127.0.0.1:6633: connection failed (Connection refused)
2017-02-20T05:14:51.473Z|00069|rconn|WARN|br-tun<->tcp:127.0.0.1:6633: connection failed (Connection refused)
2017-02-20T05:14:59.475Z|00070|rconn|INFO|br-int<->tcp:127.0.0.1:6633: connected
2017-02-20T05:14:59.475Z|00071|rconn|INFO|br-tun<->tcp:127.0.0.1:6633: connected
2017-02-20T05:14:59.758Z|00072|bridge|INFO|bridge br-int: added interface tap06425d21-86 on port 3
2017-02-20T05:15:00.762Z|00073|netdev_linux|INFO|ioctl(SIOCGIFHWADDR) on tap06425d21-86 device failed: No such device
2017-02-20T05:15:01.017Z|00074|netdev_linux|WARN|ioctl(SIOCGIFINDEX) on tap06425d21-86 device failed: No such device
2017-02-20T05:15:03.834Z|00075|bridge|INFO|bridge br-int: added interface qr-16f820a0-a7 on port 4
2017-02-20T05:15:03.834Z|00076|netdev_linux|WARN|tap06425d21-86: removing policing failed: No such device
2017-02-20T05:15:04.058Z|00077|netdev_linux|WARN|qr-16f820a0-a7: removing policing failed: No such device
2017-02-20T05:15:04.190Z|00078|netdev_linux|INFO|ioctl(SIOCGIFHWADDR) on qr-16f820a0-a7 device failed: No such device
2017-02-20T05:15:04.450Z|00079|netdev_linux|WARN|ioctl(SIOCGIFINDEX) on qr-16f820a0-a7 device failed: No such device
2017-02-20T05:15:04.911Z|00080|bridge|INFO|bridge br-ex: added interface qg-0c0cefce-33 on port 2
2017-02-20T05:15:04.911Z|00081|netdev_linux|WARN|qr-16f820a0-a7: removing policing failed: No such device
2017-02-20T05:15:04.979Z|00082|netdev_linux|WARN|qg-0c0cefce-33: removing policing failed: No such device
2017-02-20T05:15:04.988Z|00083|netdev_linux|INFO|ioctl(SIOCGIFHWADDR) on qg-0c0cefce-33 device failed: No such device
2017-02-20T05:15:05.072Z|00084|netdev_linux|WARN|ioctl(SIOCGIFINDEX) on qg-0c0cefce-33 device failed: No such device
2017-02-20T05:15:10.373Z|00085|netdev_linux|WARN|qg-0c0cefce-33: removing policing failed: No such device
2017-02-20T05:15:10.461Z|00086|connmgr|INFO|br-int<->tcp:127.0.0.1:6633: 3 flow_mods 10 s ago (3 adds)
2017-02-20T05:15:10.659Z|00087|bridge|INFO|bridge br-int: added interface qvod05f4da7-11 on port 5