> I know the reason is relate to flows. Sorry for not enough info. 
> With instance reboot & ping success, i see the line like this in 
> /var/log/neutron/openvswitch-agent.log:
> 'sudo', '/usr/bin/neutron-rootwrap', '/etc/neutron/rootwrap.conf', 
> 'ovs-vsctl', '--timeout=2', 'set', 'Port', 'tapdc13282e-b 3', 'tag=2'
>
>But with instances i can not ping, i don't see the line in 
>openvswitch-agent.log

I would check if the message actually hits the messagebus or if the agent does 
not pick it up.
If it never hits the messagebus I guess this is not related to the neutron 
agent but the neutron (api) server code or Nova.
Check the Nova and Neutron server logs to see if the message is actually being 
put the messagebus.
Could give an understanding where/why this is going wrong.

Cheers,

Robert van Leeuwen


















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