Re: [PATCH] qemu: allow to control host side link status of network device

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On Tue, May 16, 2017 at 10:28:27AM +0300, Vasiliy Tolstov wrote:
> 2017-05-16 9:32 GMT+03:00 Peter Krempa <pkrempa@xxxxxxxxxx>:
> > 3.3.2? We dropped micro versions some time ago.
> >
> 
> This is copy/paste from link element, sorry.
> 
> >> +    </p>
> >> +
> >>      <h5><a name="mtu">MTU configuration</a></h5>
> >>  <pre>
> >
> >
> > There already is an element called <link> with attribute "state" which
> > modifies the link state in qemu. So that maps to guest link state. So
> > this patch has a naming collision going on.
> 
> Yes, but some times ago Laine Stump says that for host side link
> status we can use source element with link state.
> 
> >
> > I also don't really see how modifying the host side link state would be
> > useful. Could you elaborate why you think it would be useful?
> 
> OSPF - tap device have addresses assigned to it and bird/quagga create
> routing based on interface link status and addresses on device.
> So if i have host side device in up state no matter that have guest -
> host system forward traffic to it. So i need to modify host side link
> status too.

Shouldn't we just tie the host & guest link state together then. This
doesn't seem like enough of a reason to introduce new XML elements.


Regards,
Daniel
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