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On RH systems (F20,CentOS 7) :-

    [root@juno2 ~]# systemctl | grep neutron
    neutron-openvswitch-agent.service                                                                loaded active running   OpenStack Neutron Open vSwitch Agent
    neutron-ovs-cleanup.service                                                                      loaded active exited    OpenStack Neutron Open vSwitch Cleanup Utility
    [root@juno2 ~]# systemctl restart neutron-openvswitch-agent.service
    [root@juno2 ~]# systemctl status neutron-openvswitch-agent.service
    neutron-openvswitch-agent.service - OpenStack Neutron Open vSwitch Agent
       Loaded: loaded (/usr/lib/systemd/system/neutron-openvswitch-agent.service; enabled)
       Active: active (running) since Sat 2014-12-06 21:37:05 MSK; 23s ago
     Main PID: 16459 (neutron-openvsw)
       CGroup: /system.slice/neutron-openvswitch-agent.service
               ├─16459 /usr/bin/python /usr/bin/neutron-openvswitch-agent --config-file /usr/share/neutron...
               ├─16595 sudo neutron-rootwrap /etc/neutron/rootwrap.conf ovsdb-client monitor Interface nam...
               ├─16597 /usr/bin/python /usr/bin/neutron-rootwrap /etc/neutron/rootwrap.conf ovsdb-client m...
               └─16599 /bin/ovsdb-client monitor Interface name,ofport --format=json

    Dec 06 21:37:12 juno2.localdomain sudo[16756]: neutron : TTY=unknown ; PWD=/ ; USER=root ; COMMAND=...int
 .  .  .  .  .   .  .
    Dec 06 21:37:28 juno2.localdomain sudo[16786]: neutron : TTY=unknown ; PWD=/ ; USER=root ; COMMAND=...=23
    Hint: Some lines were ellipsized, use -l to show in full.

VMs keep running (at least ):-

[root@juno2 ~(keystone_kashyap)]# nova list
+--------------------------------------+---------------+--------+------------+-------------+------------------------------------------+
| ID                                   | Name          | Status | Task State | Power State | Networks                                 |
+--------------------------------------+---------------+--------+------------+-------------+------------------------------------------+
| 95a8c989-2d15-4889-994e-cf88a3a8a836 | UbuntuRSX0512 | ACTIVE | -          | Running     | kashyap_private=40.0.0.16, 192.168.1.155 |
+--------------------------------------+---------------+--------+------------+-------------+------------------------------------------+

On RH systems (F20,CentOS 7) :-

    [root@juno2 ~]# systemctl | grep neutron
    neutron-openvswitch-agent.service                                                                loaded active running   OpenStack Neutron Open vSwitch Agent
    neutron-ovs-cleanup.service                                                                      loaded active exited    OpenStack Neutron Open vSwitch Cleanup Utility
    [root@juno2 ~]# systemctl restart neutron-openvswitch-agent.service
    [root@juno2 ~]# systemctl status neutron-openvswitch-agent.service
    neutron-openvswitch-agent.service - OpenStack Neutron Open vSwitch Agent
       Loaded: loaded (/usr/lib/systemd/system/neutron-openvswitch-agent.service; enabled)
       Active: active (running) since Sat 2014-12-06 21:37:05 MSK; 23s ago
     Main PID: 16459 (neutron-openvsw)
       CGroup: /system.slice/neutron-openvswitch-agent.service
               ├─16459 /usr/bin/python /usr/bin/neutron-openvswitch-agent --config-file /usr/share/neutron...
               ├─16595 sudo neutron-rootwrap /etc/neutron/rootwrap.conf ovsdb-client monitor Interface nam...
               ├─16597 /usr/bin/python /usr/bin/neutron-rootwrap /etc/neutron/rootwrap.conf ovsdb-client m...
               └─16599 /bin/ovsdb-client monitor Interface name,ofport --format=json

    Dec 06 21:37:12 juno2.localdomain sudo[16756]: neutron : TTY=unknown ; PWD=/ ; USER=root ; COMMAND=...int
 .  .  .  .  .   .  .
    Dec 06 21:37:28 juno2.localdomain sudo[16786]: neutron : TTY=unknown ; PWD=/ ; USER=root ; COMMAND=...=23
    Hint: Some lines were ellipsized, use -l to show in full.

VMs keep running (at least ):-

[root@juno2 ~(keystone_kashyap)]# nova list
+--------------------------------------+---------------+--------+------------+-------------+------------------------------------------+
| ID                                   | Name          | Status | Task State | Power State | Networks                                 |
+--------------------------------------+---------------+--------+------------+-------------+------------------------------------------+
| 95a8c989-2d15-4889-994e-cf88a3a8a836 | UbuntuRSX0512 | ACTIVE | -          | Running     | kashyap_private=40.0.0.16, 192.168.1.155 |
+--------------------------------------+---------------+--------+------------+-------------+------------------------------------------+

I've started long setup via Synaptic Manager on UbuntuRSX0512 && several times restarted agent no harm.