I set br-ex in havana, but I cannot connect to internet through br-ex. in
"ovs-vswitchd.log" , it shows:

2014-06-10T02:46:27Z|57820|dpif|WARN|system@ovs-system: failed to add em1
as port: Device or resource busy

ovs-vsctl show
    Bridge br-ex
        Port br-ex
            Interface br-ex
                type: internal
        Port "em1"
            Interface "em1"

# ifconfig
br-ex     Link encap:Ethernet  HWaddr 2e:8b:07:4a:38:47
            inet addr:172.31.9.201  Bcast:172.31.9.255  Mask:255.255.255.0

em1      Link encap:Ethernet  HWaddr 78:2b:cb:43:59:d7
             UP BROADCAST RUNNING PROMISC MULTICAST


# ping 172.31.9.1
PING 172.31.9.1 (172.31.9.1) 56(84) bytes of data.
>From 172.31.9.201 icmp_seq=1 Destination Host Unreachable

 #ovs-dpctl show
system@ovs-system:
        lookups: hit:846265 missed:289822 lost:0
        flows: 13
        port 0: ovs-system (internal)
        port 1: br-int (internal)
        port 2: br-ex
        port 3: tapa920a005-ce
        port 4: tap4fab48f8-98
        port 5: tap13ef7ee2-d7


after I delete the br-ex, the em1 can connect internet.
do you have any idea to find the reason or solve it?

thanks
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