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The OVS agent has been implemented under the assumption that you're working with two bridges, it's a requirement. It creates the tunneling bridge if you enable tunneling, you can't have it any other way.



> On 24 במאי 2015, at 03:52, Daniel Comnea <comnea.dani at gmail.com> wrote:
> 
> 
> 
>> On Sat, May 23, 2015 at 12:43 PM, Assaf Muller <amuller at redhat.com> wrote:
>> There's no real reason as far as I'm aware, just an implementation decision.
> [DC]: in this case wouldn't this bee seen suitable as best practicies vs what every blog/ manual is suggesting? 
>> 
>> 
>> 
>> On 21 במאי 2015, at 01:48, Na Zhu <nazhu at cn.ibm.com> wrote:
>> 
>>> Dear,
>>> 
>>> 
>>> When OVS plugin is used with GRE option in Neutron, I see that each compute 
>>> node has br-tun and br-int bridges created. 
>>> 
>>> I'm trying to understand why we need the additional br-tun bridge here. 
>>> Can't we create tunneling ports in br-int bridge, and have br-int relay 
>>> traffic between VM ports and tunneling ports directly? Why do we have to 
>>> introduce another br-tun bridge?  
>>> 
>>> 
>>> Regards,
>>> Juno Zhu
>>> Staff Software Engineer, System Networking
>>> China Systems and Technology Lab (CSTL), IBM Wuxi
>>> Email: nazhu at cn.ibm.com
>>> 
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