setup: one controller/network node; 2 compute nodes; DVR

Symptom: Compute1 can not ping to provider network through dvr, while compute2 works properly.

Observations: Compute2: have the proper br-ex flow entries, particularly: cookie=0xb766867925a68f74, duration=2986.041s, table=0, n_packets=21, n_bytes=994, idle_age=592, priority=4,in_port=1,dl_v lan=2 actions=strip_vlan,NORMAL

Compute1: sometimes missing that particular flow; other times missing all flows, by restarting neutron-openvswitch-agent.service Inspecting the agent log: 2017-09-28 21:59:20.442 4024 INFO neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent [req-8d199a48-8ea0-4c77-a785-fcf1cd7e4294 - - - - -] Agent out of sync with plugin!

Attempted restarting controller, compute nodes, but still not working properly on compute2.