[ovs-discuss] ovn environment live migrate ping packets lose

[鲁 成]

Environment info:
Open vSwitch 2.12.0
ovn-controller 21.06.0

Reproducible:
Keep ping vm1, and try to do live-migrate for vm1.
I except ping packet will not lose, but almost lose 5 ~ 10 packet each times.

What I found:
when do a live-migrate, nova will create a tap on target node, after migrate finished, will delete tap on the source node
Ovn controller on the target node will try to claim lport, but it will not succeed until source node release lport.
But it take some time from release lport to claim succeed, and at this time port_binding chassis field is empty, so it not gonna generate openflow and send to vswitchd.


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