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Hi,

I presume that you upgraded from an older version that used nova-network
(now called legacy networking).

Using neutron means that VMs aren't connected to br0 directly any more
as there is a whole virtual networking infrastructure in place.

To give a small overview:

On a compute node a VM connects to br-int (integration bridge). This
bridge itself is connected through a virtual cable to br-tun (tunneling
bridge). That bridge has also assigned a physical interface that allows
traffic to flow to the network node

On the network node there also exists a br-tun that has a physical
interface attached. Through this inferface traffic enters the node.
br-tun is virtually connected to br-ex that has a separate physical
interface attached that connects to "the outside", meaning the
networking infrastructure outside your cloud.

I cannot help you with the configuration issue but recommend that you
familiarize yourself with neutron.

Regards,

	Uwe

Am 14.12.2014 um 19:36 schrieb Gonzalo Aguilar Delgado:
> Hi all, 
> 
> I'm installing a new compute node from scratch and reviewing all old
> config. I've found two setting that seems equal, one in ml2 plugin and
> one in openvswitch.
> 
> But I don't really understand why they are.
> 
> ovs_neutron_plugin.ini:
> bridge_mappings = default:br0,extnet1:br-ex
> 
> 
> ml2/ml2_conf.ini:
> [ovs]
> bridge_mappings = default:br0,extnet1:br-ex
> 
> 
> For me it's strange the settings are in both places. I think this is a
> result of upgrading without taking much care of removing old config.
> 
> 
>  But also it's strange that everything works with the bridges br0 and
> br-ex without physical interface. I mean, seems to do nothing but it
> needs to be there.  
> Also I should expect VM be attached to br0 (Default) but it's not, they
> are attached to the br-int (integration bridge), for me this is correct.
> Since it's described here like this:
> 
> https://openstack.redhat.com/Networking_in_too_much_detail
> 
> And works ok. 
> 
> So what's the purporse of these bridges?
> 
> Here is:
> 
> neutron 2.3.4
> nova      2.17.0
> 
> Best regards,
> 
> 
> 
> 
> 
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