[fedora-virt] Curent status of virt-manager Open vSwitch support

[Laine Stump]

On 09/25/2014 11:45 AM, Ian Pilcher wrote:
> On 09/23/2014 09:48 AM, Laine Stump wrote:
>> Instead of this, create a libvirt network that points to the ovs bridge,
>> something like this:
>>
>> <network>
>>   <name>ovs-net</name>
>>   <forward mode='bridge'/>
>>   <bridge name='ovs0'/>
>>   <virtualport type='openvswitch'/>
>> </network>
>>
>> net-start and net-autostart that network, then whenever you create new
>> guests, point their network device at this network.
> That's what I was hoping for.  Thank you, thank you, thank you!
>
>> The one caveat of this is that no permanent interfaceid will be
>> generated for each interface, so each time a guest is started, it will
>> get a new OVS interfaceid. To solve this, just add:
>>
>>   <virtualport type='openvswitch'/>
>>
>> to the guest's <interface> at some later time (this can be after the
>> installation is already finished) using virsh edit - a permanent
>> interfaceid will be automatically generated and used from then on.
> What are the implications (if any) of not having a permanent interface
> ID?
>

Truthfully, I'm not sure of the details, but I think the interfaceid may
be used by OVS for configuring/tracking packet filtering rules, and for
making sure that use statistics and filter rules are properly
transferred from one host to another when a guest migrates. That's just
a vague recollection combined with some guessing :-)