[ovs-discuss] Create ovs br0 failed using command "ovs-vsctl add-br br0"

[fukaige]

Hi all,

I use command "ovs-vsctl add-br br0" to create a bridge, but got below log:

ovs-vsctl: Error detected while setting up 'br0'.  See ovs-vswitchd log for details.

Then, I check the ovs-vswitched log for details:

2017-03-30T01:23:49.324Z|00056|ofproto_dpif|INFO|system at ovs-system: Datapath supports recirculation
2017-03-30T01:23:49.324Z|00057|ofproto_dpif|INFO|system at ovs-system: MPLS label stack length probed as 1
2017-03-30T01:23:49.324Z|00058|ofproto_dpif|INFO|system at ovs-system: Datapath supports unique flow ids
2017-03-30T01:23:49.324Z|00059|ofproto_dpif|INFO|system at ovs-system: Datapath supports ct_state
2017-03-30T01:23:49.324Z|00060|ofproto_dpif|INFO|system at ovs-system: Datapath supports ct_zone
2017-03-30T01:23:49.325Z|00061|ofproto_dpif|INFO|system at ovs-system: Datapath supports ct_mark
2017-03-30T01:23:49.325Z|00062|ofproto_dpif|INFO|system at ovs-system: Datapath supports ct_label
2017-03-30T01:23:49.400Z|00001|ofproto_dpif_upcall(handler386)|INFO|received packet on unassociated datapath port 0
2017-03-30T01:23:49.404Z|00063|netdev_linux|WARN|ethtool command ETHTOOL_GFLAGS on network device br0 failed: No such device
2017-03-30T01:23:49.404Z|00064|dpif|WARN|system at ovs-system: failed to add br0 as port: No such device
2017-03-30T01:23:49.404Z|00065|bridge|INFO|bridge br0: using datapath ID 000036dab10ee643
2017-03-30T01:23:49.404Z|00066|connmgr|INFO|br0: added service controller "punix:/var/run/openvswitch/br0.mgmt"

I delete the br0, then try to add it. But, got same error as above.

Finally, I restart the thread ovs-vswitchd and ovsdb-server. Then, the error disappear and ovs-vsctl add-br br0 work well.

My question:
	1. Is any one meet with the same error?
	2. Is any one can offer some suggestions to reproduce the error?