cd /var/lib/nova/instances/instance-xxxx/

修改 libvirt.xml  添加 <model type='e1000' />

 

<interface type='bridge'>

            <model type='e1000' />

            <source bridge='br500'/>

            <mac address='02:16:3e:7f:f8:42'/>

            <filterref filter="nova-instance-instance-0000004f-02163e7ff842">

                <parameter name="IP" value="192.168.123.68" />

                <parameter name="DHCPSERVER" value="192.168.123.60" />

            </filterref>

        </interface>

保存。

virsh destroy instance-xxx
virsh undefine instance-xxx
 virsh define libvirt.xml
 virsh start instance-xxx