LibvirtOpenVswitchDriver vs LibvirtHybridOVSBridgeDriver

asked 2012-11-08 20:17:17 -0600

sunil-srivastava gravatar image

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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answered 2012-11-24 02:25:15 -0600

gongysh gravatar image

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: (

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answered 2013-10-12 05:43:49 -0600

chen-li gravatar image

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

Thanks a lot!!!

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answered 2013-10-12 06:34:25 -0600

gongysh gravatar image

It is at!127&app=PowerPoint&authkey=!AK0Y3KWzD6o3WVI (

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Asked: 2012-11-08 20:17:17 -0600

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Last updated: Oct 12 '13