* William Lima Reiznautt ([email protected]) wrote: > Hi folks, > > I hope everything is well.
Hi, > Sorry about that doubt in this channel. No, it's the right place to ask! > I have a doubt about live migration interacting with layer 2 network, when > the live migration is running. How does the qemu signal the switch network > that the qemu instance changes port ? Because when the qemu migration to > another port switch, the switch has a time to understand that flow is > changed. > > I saw the dump traffic in live migration and I noticed that one packet > (RARP). "This packet is created by qemu." > > Does anyone know if there is documentation on this? I'm not sure we have documentation, but the code is in net/announce.c in recent qemu. When the migration has finished we send an ARP and then, when it starts running, we tell the guest to send a RARP; we send those a few times to make sure we don't miss it. Those are normally enough for the switch to realise that the VM has moved port; some very complex switch setups are less forgiving - in recent qemu's you can send the announce again later and/or change the timing of it. Dave > Thanks > > - - - > William Lima Reiznautt > [email protected] > www.ic.unicamp.br/~william -- Dr. David Alan Gilbert / [email protected] / Manchester, UK
