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LibvirtOpenVswitchDriver vs LibvirtHybridOVSBridgeDriver

Asked by Sunil Srivastava

I understand the differences and looked at code.

But trying to understand why " ip', 'tuntap', 'add', dev, 'mode', 'tap'" is used in OVS and why it is not used for Linux Bridges or OVS Bridge?

Then trying to understand usage of vether in the HYbrid case. We have qvo* on OVS and qvb* on Linux Bridge. VM is attached to qbr* directly or qvb*?

Understand qvo* and qvb* are linked together as vether, but do this go via qbr*?

Also, if someone could explain how a VM VIF is instantiated through LibVIrt.

Things a bit hazy reading the code and need some good soul to walk through it and clarify for me.

Regards,
Sunil.

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yong sheng gong (gongysh) said : 		#1

VM is attached to qvb, which is a port on a linux bridge, is a VM tap dev.
qvo is a port on a ovs bridge.

I hope the slides will help:
http://wiki.openstack.org/Quantum?action=AttachFile&do=get&target=quantum-technical-archicture.ppt

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li,chen (chen-li) said : 		#2

The wiki link is invalid now.
Anyone can provide an updated link ?

Thanks a lot!!!

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yong sheng gong (gongysh) said : 		#3

It is at https://skydrive.live.com/view.aspx?resid=8F95A76243630FB1!127&app=PowerPoint&authkey=!AK0Y3KWzD6o3WVI

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