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Hi all!
I try to resolve this problem during 2 weeks :(

I use up-to-date Centos 7 and Juno.

I have study infrastructure:
1) compute node // probably works fine
2) controller node // probably works fine
3) nethost node // here is mistery and crazy problems with openvswitch

if I manually up interface in first and second VM, vm1 can ping vm2,
and vm2 can ping vm1, But on network node is crazy, and don't
understand situation.

Br-int bridge has a down and no-link interfaces:

  [root at nethost ~]# ovs-ofctl show br-int
OFPT_FEATURES_REPLY (xid=0x2): dpid:00006282de3ad749
n_tables:254, n_buffers:256
capabilities: FLOW_STATS TABLE_STATS PORT_STATS QUEUE_STATS ARP_MATCH_IP
actions: OUTPUT SET_VLAN_VID SET_VLAN_PCP STRIP_VLAN SET_DL_SRC
SET_DL_DST SET_NW_SRC SET_NW_DST SET_NW_TOS SET_TP_SRC SET_TP_DST
ENQUEUE
 3(int-br-vlan): addr:5a:8a:ac:4d:6a:41
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 4(int-br-ex): addr:36:a4:18:b8:59:7d
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 20204(tap270c51fa-76): addr:62:82:de:3a:d7:49
     config:     PORT_DOWN
     state:      LINK_DOWN
     speed: 0 Mbps now, 0 Mbps max
 20205(qr-1a0e7fd7-63): addr:00:00:00:00:00:00
     config:     PORT_DOWN
     state:      LINK_DOWN
     speed: 0 Mbps now, 0 Mbps max
 20206(qg-8d652de9-58): addr:62:82:de:3a:d7:49
     config:     PORT_DOWN
     state:      LINK_DOWN
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-int): addr:62:82:de:3a:d7:49
     config:     PORT_DOWN
     state:      LINK_DOWN
     speed: 0 Mbps now, 0 Mbps max
OFPT_GET_CONFIG_REPLY (xid=0x4): frags=normal miss_send_len=0

In compute node br-int works fine (whithout down ports)  and in
network node another bridges (br-vlan and br-ex) also works fine

If I try to delete openvsiwtch (and rm -rf /etc/openvswitch) and
neutron-openvswitch-agent, after install it again, openvswitch create
down interfaces in namepaces again:

But I can ping IP in router interface:

[root at nethost ~]# ip netns exec
qrouter-7573b61c-1cb2-43bc-8296-421e319d2bd0 ifconfig
lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 0  (Local Loopback)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

qg-8d652de9-58: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 10.2.57.68  netmask 255.255.255.0  broadcast 10.2.57.255
        inet6 fe80::f816:3eff:fe4e:b045  prefixlen 64  scopeid 0x20<link>
        ether fa:16:3e:4e:b0:45  txqueuelen 0  (Ethernet)
        RX packets 1027  bytes 67477 (65.8 KiB)
        RX errors 0  dropped 11  overruns 0  frame 0
        TX packets 45  bytes 2334 (2.2 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

qr-1a0e7fd7-63: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 10.0.0.1  netmask 255.255.255.0  broadcast 10.0.0.255
        inet6 fe80::f816:3eff:feac:4843  prefixlen 64  scopeid 0x20<link>
        ether fa:16:3e:ac:48:43  txqueuelen 0  (Ethernet)
        RX packets 3  bytes 230 (230.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 10  bytes 864 (864.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

[root at nethost ~]#

[root at nethost ~]# ip netns exec
qdhcp-f8bdf250-d08f-467a-a073-003ea3165c5d ifconfig
lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 0  (Local Loopback)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

tap270c51fa-76: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 10.0.0.101  netmask 255.255.255.0  broadcast 10.0.0.255
        inet6 fe80::f816:3eff:fee8:3cd7  prefixlen 64  scopeid 0x20<link>
        ether fa:16:3e:e8:3c:d7  txqueuelen 0  (Ethernet)
        RX packets 9  bytes 782 (782.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 3  bytes 258 (258.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

[root at nethost ~]#
[root at nethost ~]# ping -c 1 10.0.0.1
PING 10.0.0.1 (10.0.0.1) 56(84) bytes of data.
64 bytes from 10.0.0.1: icmp_seq=1 ttl=64 time=0.624 ms

--- 10.0.0.1 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.624/0.624/0.624/0.000 ms
[root at nethost ~]# ping -c 1 10.0.0.101
PING 10.0.0.101 (10.0.0.101) 56(84) bytes of data.
>From 10.0.0.2 icmp_seq=1 Destination Host Unreachable

--- 10.0.0.101 ping statistics ---
1 packets transmitted, 0 received, +1 errors, 100% packet loss, time 0ms

[root at nethost ~]#

I try to reinstall nethost node in 2 times, but problem was again.