Installing ipset solves the issue on Mitaka and was able to spin-up a VM on the corresponding network. But testing a little bit further I saw this problem too when attaching a port to a new created VM instead of assigning a network even if ipset is installed on the compute node. Down the errors that I saw on the linuxbridge-agent.log on the compute node 2016-05-09 09:52:02.771 1402 ERROR neutron.plugins.ml2.drivers.agent._common_agent [req-d667c5cf-b953-4ca0-a31a-6bed2d387825 - - - - -] Error in agent loop. Devices info: {'current': set([]), 'timestamps': {}, 'removed': set(['tap0272f27b-aa', 'tapad0fb9de-9c']), 'added': set([]), 'updated': set([])} 2016-05-09 09:52:02.771 1402 ERROR neutron.plugins.ml2.drivers.agent._common_agent Traceback (most recent call last): 2016-05-09 09:52:02.771 1402 ERROR neutron.plugins.ml2.drivers.agent._common_agent File "/usr/lib/python2.7/site-packages/neutron/plugins/ml2/drivers/agent/_common_agent.py", line 417, in daemon_loop 2016-05-09 09:52:02.771 1402 ERROR neutron.plugins.ml2.drivers.agent._common_agent sync = self.process_network_devices(device_info) 2016-05-09 09:52:02.771 1402 ERROR neutron.plugins.ml2.drivers.agent._common_agent File "/usr/lib/python2.7/site-packages/neutron/plugins/ml2/drivers/agent/_common_agent.py", line 190, in process_network_devices 2016-05-09 09:52:02.771 1402 ERROR neutron.plugins.ml2.drivers.agent._common_agent device_info.get('updated')) 2016-05-09 09:52:02.771 1402 ERROR neutron.plugins.ml2.drivers.agent._common_agent File "/usr/lib/python2.7/site-packages/neutron/agent/securitygroups_rpc.py", line 315, in setup_port_filters 2016-05-09 09:52:02.771 1402 ERROR neutron.plugins.ml2.drivers.agent._common_agent self.refresh_firewall(updated_devices) 2016-05-09 09:52:02.771 1402 ERROR neutron.plugins.ml2.drivers.agent._common_agent File "/usr/lib/python2.7/site-packages/neutron/agent/securitygroups_rpc.py", line 152, in decorated_function 2016-05-09 09:52:02.771 1402 ERROR neutron.plugins.ml2.drivers.agent._common_agent *args, **kwargs) 2016-05-09 09:52:02.771 1402 ERROR neutron.plugins.ml2.drivers.agent._common_agent File "/usr/lib/python2.7/site-packages/neutron/agent/securitygroups_rpc.py", line 268, in refresh_firewall 2016-05-09 09:52:02.771 1402 ERROR neutron.plugins.ml2.drivers.agent._common_agent self.firewall.update_port_filter(device) 2016-05-09 09:52:02.771 1402 ERROR neutron.plugins.ml2.drivers.agent._common_agent File "/usr/lib64/python2.7/contextlib.py", line 24, in __exit__ 2016-05-09 09:52:02.771 1402 ERROR neutron.plugins.ml2.drivers.agent._common_agent self.gen.next() 2016-05-09 09:52:02.771 1402 ERROR neutron.plugins.ml2.drivers.agent._common_agent File "/usr/lib/python2.7/site-packages/neutron/agent/firewall.py", line 128, in defer_apply 2016-05-09 09:52:02.771 1402 ERROR neutron.plugins.ml2.drivers.agent._common_agent self.filter_defer_apply_off() 2016-05-09 09:52:02.771 1402 ERROR neutron.plugins.ml2.drivers.agent._common_agent File "/usr/lib/python2.7/site-packages/neutron/agent/linux/iptables_firewall.py", line 815, in filter_defer_apply_off 2016-05-09 09:52:02.771 1402 ERROR neutron.plugins.ml2.drivers.agent._common_agent self._remove_conntrack_entries_from_sg_updates() 2016-05-09 09:52:02.771 1402 ERROR neutron.plugins.ml2.drivers.agent._common_agent File "/usr/lib/python2.7/site-packages/neutron/agent/linux/iptables_firewall.py", line 802, in _remove_conntrack_entries_from_sg_updates 2016-05-09 09:52:02.771 1402 ERROR neutron.plugins.ml2.drivers.agent._common_agent self._clean_deleted_remote_sg_members_conntrack_entries() 2016-05-09 09:52:02.771 1402 ERROR neutron.plugins.ml2.drivers.agent._common_agent File "/usr/lib/python2.7/site-packages/neutron/agent/linux/iptables_firewall.py", line 794, in _clean_deleted_remote_sg_members_conntrack_entries 2016-05-09 09:52:02.771 1402 ERROR neutron.plugins.ml2.drivers.agent._common_agent devices, ethertype, ips) 2016-05-09 09:52:02.771 1402 ERROR neutron.plugins.ml2.drivers.agent._common_agent File "/usr/lib/python2.7/site-packages/neutron/agent/linux/ip_conntrack.py", line 86, in delete_conntrack_state_by_remote_ips 2016-05-09 09:52:02.771 1402 ERROR neutron.plugins.ml2.drivers.agent._common_agent device_info_list, rule, remote_ip) 2016-05-09 09:52:02.771 1402 ERROR neutron.plugins.ml2.drivers.agent._common_agent File "/usr/lib/python2.7/site-packages/neutron/agent/linux/ip_conntrack.py", line 72, in _delete_conntrack_state 2016-05-09 09:52:02.771 1402 ERROR neutron.plugins.ml2.drivers.agent._common_agent extra_ok_codes=[1]) 2016-05-09 09:52:02.771 1402 ERROR neutron.plugins.ml2.drivers.agent._common_agent File "/usr/lib/python2.7/site-packages/neutron/agent/linux/utils.py", line 116, in execute 2016-05-09 09:52:02.771 1402 ERROR neutron.plugins.ml2.drivers.agent._common_agent execute_rootwrap_daemon(cmd, process_input, addl_env)) 2016-05-09 09:52:02.771 1402 ERROR neutron.plugins.ml2.drivers.agent._common_agent File "/usr/lib/python2.7/site-packages/neutron/agent/linux/utils.py", line 102, in execute_rootwrap_daemon 2016-05-09 09:52:02.771 1402 ERROR neutron.plugins.ml2.drivers.agent._common_agent return client.execute(cmd, process_input) 2016-05-09 09:52:02.771 1402 ERROR neutron.plugins.ml2.drivers.agent._common_agent File "/usr/lib/python2.7/site-packages/oslo_rootwrap/client.py", line 128, in execute 2016-05-09 09:52:02.771 1402 ERROR neutron.plugins.ml2.drivers.agent._common_agent res = proxy.run_one_command(cmd, stdin) 2016-05-09 09:52:02.771 1402 ERROR neutron.plugins.ml2.drivers.agent._common_agent File "", line 2, in run_one_command 2016-05-09 09:52:02.771 1402 ERROR neutron.plugins.ml2.drivers.agent._common_agent File "/usr/lib64/python2.7/multiprocessing/managers.py", line 773, in _callmethod 2016-05-09 09:52:02.771 1402 ERROR neutron.plugins.ml2.drivers.agent._common_agent raise convert_to_error(kind, result) 2016-05-09 09:52:02.771 1402 ERROR neutron.plugins.ml2.drivers.agent._common_agent RemoteError: 2016-05-09 09:52:02.771 1402 ERROR neutron.plugins.ml2.drivers.agent._common_agent --------------------------------------------------------------------------- 2016-05-09 09:52:02.771 1402 ERROR neutron.plugins.ml2.drivers.agent._common_agent Unserializable message: ('#ERROR', FilterMatchNotExecutable()) 2016-05-09 09:52:02.771 1402 ERROR neutron.plugins.ml2.drivers.agent._common_agent --------------------------------------------------------------------------- 2016-05-09 09:52:02.771 1402 ERROR neutron.plugins.ml2.drivers.agent._common_agent Will keep you posted if I resolve the issue Thanks