Live migration garp

Michal Privoznik mprivozn at
Thu Apr 30 09:12:30 UTC 2020

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:
> 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.


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