After some digging on my local devstack VM I found that problem is happend every time when I do hard reboot of VM - after hard reboot I can't ssh to it.
In attachement I paste dump of "good" OF rules - those are rules from before hard reboot when VM is accessible and "bad" OF rules - those are rules from after hard reboot when VM is not accessible anymore.
Restart of ovs L2 agent fixes issue and VM is accessible again.
After some digging on my local devstack VM I found that problem is happend every time when I do hard reboot of VM - after hard reboot I can't ssh to it.
In attachement I paste dump of "good" OF rules - those are rules from before hard reboot when VM is accessible and "bad" OF rules - those are rules from after hard reboot when VM is not accessible anymore.
Restart of ovs L2 agent fixes issue and VM is accessible again.