------- Comment From [email protected] 2016-09-30 05:04 EDT-------
Hello,

Thanks for the information.  Regarding your questions. First of all,
single nic is not mandatory. It happened I only have OSA port available
at that time. I got another OSA port afterwards.  But I still have the
same issue with the 2nd nic.

Below was exactly what I did.

1. I used below commands to create bridge.  The nic was not assigned an
IP address.

brctl addbr br0
brctl addif br0 enc3030

2. Issued brctl show, I can see the bridge info looks OK.

3. Define a VM on KVM. Dump the network device part. And the VM was using an IP 
address that can be accessed in a corporate LAN.
<interface type='bridge'>
<mac address='52:54:00:58:98:c1'/>
<source bridge='br0'/>
<model type='virtio'/>
<address type='ccw' cssid='0xfe' ssid='0x0' devno='0x0001'/>
</interface>

4. After started the VM, I could see a port attached the bridge.
Something like tap8e806d7c-d9.

5. But I couldn't ping the VM successfully from a server out side of KVM
host.

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https://bugs.launchpad.net/bugs/1626826

Title:
  KVM guest cannot use br0 created by brctl on Ubuntu16.04

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