On 4/28/20 9:45 PM, Ignazio Cassano wrote:
> Hello All, I am facing issues under openstack rocky with last libvirt
> available on centos 7.
> There is an open discussione here:
>
> https://bugs.launchpad.net/neutron/+bug/1866139
>
> About sending garp when an instance live migrate.
> What must send garp ?
>
> The problem is this: when live migrate a vm from a node to another it
> stops to responds to ping requests. It starts to respond only when it
> send a network request for example when its chrony daemon pools a server.
> Anyone could help me, please?
> Best Regards
> Ignazio
>

Actually, I think this is OVS responsibility. On migration libvirt asks
OVS to dump its internal state into a buffer. This buffer is then
transferred onto the destination and OVS running there is fed with the
data. That sounds like the best time for OVS to send the GARP packets.

Michal