Open Stack

This uses VLANs in the examples, but everything should still generally
apply to your question:

http://masimum.inf.um.es/fjrm/2013/12/26/the-journey-of-a-packet-within-an-openstack-cloud/

Basically the TAP interface attaches to the qvb interface which links it to
a veth pair (qvr and qvo) with qvo attached to the integration bridge
(br-int) which then goes to patch-tun and into br-tun. Fun right? ;).

On Wed, Nov 19, 2014 at 10:12 AM, Stinner, Thomas <
Thomas.Stinner at schweickertgruppe.de> wrote:

> Hi,
>
> i would like to understand how Neutron is configuring OpenVswitch when
> using ML2.
>
> For example, on one of the compute nodes I have a VM that is called
> host-vxlan2. Instance name is instance-00000e7.
>
> This VM has the following network interface:
>
> <interface type='bridge'>
>       <mac address='fa:16:3e:d7:d7:13'/>
>       <source bridge='qbrea4f9446-76'/>
>       <target dev='tapea4f9446-76'/>
>       <model type='virtio'/>
>       <alias name='net0'/>
>       <address type='pci' domain='0x0000' bus='0x00' slot='0x03'
> function='0x0'/>
>     </interface>
>
> The bridge has two interfaces, a tap device that is connected to the vm
> and another interface.
>
> qbrea4f9446-76          8000.6683237a7c4d       no
> qvbea4f9446-76
>
>      tapea4f9446-76
>
> OVs has three bridges - br-ex, br-int, br-tun.
>
> However, none of these bridges contain qbrea4f9446-76 or qvbea4f9446-76.
> But they contain a Port "qvoea4f9446-76" (similar name!).
>
> Which command defines the connection between "qvoea4f9446-76" and
> "qbrea4f9446-76"?
>
> Thanks in advance
> Thomas
>
>
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