On 09/03/2012 06:41 AM, yue wang wrote: > > > Hi: > > > i used to use linux bridge and specify interfaces > by 'Generic ethernet connection' mode,after > reading this page： > > > http://libvirt.org/formatdomain.html#elementsNICS > Actually, for a standard linux bridge, you should be using <interface type='bridge'> rather than <interface type='ethernet'> ("generic ethernet connection"): http://www.libvirt.org/formatdomain.html#elementsNICSBridge type='ethernet' should only be used if there is some special setup that can't be taken care of by the standard types; type='ethernet' requires special permissions that aren't normally required, and "taints" the guest - it's considered to be unsupported. > > > i am not sure if i need to change to another > mode(eg:'virtual network') to specify interfaces > when switching linux bridge to open vswitch? > > any suggestions? > As long as your libvirt version is new enough (0.9.11 or newer), you can continue to use <interface type='bridge'> (as you should have previously been), and add a <virtualport type='openvswitch'> element to the interface definition. For example, if you were previously using a linux bridge at br0, you would have have used: <interface type='bridge'> <source bridge='br0'/> ... </interface> and if you switch to using an Open vSwitch bridge named ovsbr0, you would change that to: <interface type='bridge'> <source bridge='ovsbr0'/> <virtualport type='openvswitch'/> ... </interface> (you will notice that after you've edited you interface definition like this, libvirt will automatically add a "<parameters interfaceid="[some uuid string]"/> to the <virtualport> element. This is so that the guest's interface can be known by a stable id that won't change as the guest is stopped/restarted/migrated.) If your libvirt is older than 0.9.11,you will need to either use the Open vSwitch compatibility library to make your Open vSwitch bridge appear to be a standard Linux host bridge, *or* you wil need to use <interface type='ethernet'> along with an ifup script. I would *strongly* recommend that you upgrade to 0.9.11+ if at all possible. -- libvir-list mailing list libvir-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvir-list