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Per your report :-

ifconfig -a
br-ex     Link encap:Ethernet  HWaddr b0:83:fe:d7:54:e1
          BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:72178 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:4330812 (4.3 MB)  TX bytes:0 (0.0 B)
. . . . . 

em1       Link encap:Ethernet  HWaddr b0:83:fe:d7:54:e1
          inet6 addr: fe80::b283:feff:fed7:54e1/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:75086 errors:0 dropped:0 overruns:0 frame:0
          TX packets:5321 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:4880981 (4.8 MB)  TX bytes:246790 (246.7 KB)
          Interrupt:40 Memory:95000000-957fffff

At the same time

Bridge br-ex
    Port phy-br-ex
        Interface phy-br-ex
            type: patch
            options: {peer=int-br-ex}
    Port "em1"
        Interface "em1"

You have OVS bridge br-ex and OVS port em1 misconfiguration
View for samples /etc/sysconfig/network-scripts/ifcfg-br-ex && ifcfg-em1 samples, for instance, here
http://bderzhavets.blogspot.com/2015/05/rdo-kilo-set-up-three-kvms-nodes.html

Per your report :-

ifconfig -a
br-ex     Link encap:Ethernet  HWaddr b0:83:fe:d7:54:e1
          BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:72178 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:4330812 (4.3 MB)  TX bytes:0 (0.0 B)
. . . . . 

em1       Link encap:Ethernet  HWaddr b0:83:fe:d7:54:e1
          inet6 addr: fe80::b283:feff:fed7:54e1/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:75086 errors:0 dropped:0 overruns:0 frame:0
          TX packets:5321 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:4880981 (4.8 MB)  TX bytes:246790 (246.7 KB)
          Interrupt:40 Memory:95000000-957fffff

At the same time

Bridge br-ex
    Port phy-br-ex
        Interface phy-br-ex
            type: patch
            options: {peer=int-br-ex}
    Port "em1"
        Interface "em1"

You have OVS bridge br-ex and OVS port em1 misconfiguration
View for RH samples /etc/sysconfig/network-scripts/ifcfg-br-ex && ifcfg-em1 samples, for instance, here
http://bderzhavets.blogspot.com/2015/05/rdo-kilo-set-up-three-kvms-nodes.html
For Ubuntu as base OS samples of network configuration files here
https://ask.openstack.org/en/question/67738/br-ex-configuration-on-ubuntu/