[Rdo-list] neutron-openvswitch-agent reload without ping lost

[Chris]

Hello,

We made some changes on our compute nodes in the 
“/etc/neutron/neutron.conf”. For example qpid_hostname. But nothing what 
effects the network infrastructure in the compute node.
To apply the changes I think we need to restart the 
“neutron-openvswitch-agent” service.

By restarting this service the VM gets disconnected for around one ping, 
the reason is the restart causes recreation of the int-br-bond0 and 
phy-br-bond0 interfaces:
ovs-vsctl: ovs|00001|vsctl|INFO|Called as /usr/bin/ovs-vsctl 
--timeout=10 -- --may-exist add-br br-int
ovs-vsctl: ovs|00001|vsctl|INFO|Called as /usr/bin/ovs-vsctl 
--timeout=10 -- set-fail-mode br-int secure
ovs-vsctl: ovs|00001|vsctl|INFO|Called as /usr/bin/ovs-vsctl 
--timeout=10 -- --if-exists del-port br-int patch-tun
ovs-vsctl: ovs|00001|vsctl|INFO|Called as /usr/bin/ovs-vsctl 
--timeout=10 -- --if-exists del-port br-int int-br-bond0
kernel: [73873.047999] device int-br-bond0 left promiscuous mode
ovs-vsctl: ovs|00001|vsctl|INFO|Called as /usr/bin/ovs-vsctl 
--timeout=10 -- --if-exists del-port br-bond0 phy-br-bond0
kernel: [73873.086241] device phy-br-bond0 left promiscuous mode
ovs-vsctl: ovs|00001|vsctl|INFO|Called as /usr/bin/ovs-vsctl 
--timeout=10 -- --may-exist add-port br-int int-br-bond0
kernel: [73873.287466] device int-br-bond0 entered promiscuous mode
ovs-vsctl: ovs|00001|vsctl|INFO|Called as /usr/bin/ovs-vsctl 
--timeout=10 -- --may-exist add-port br-bond0 phy-br-bond0

Is there a way to apply this changes without loose pings?

Cheers
Chris