I install openstack-ocata in my CentOS7.2, I install the controller and compute in one node.

In can not use neutron agent-list to show the agent list, there shows nothing:

[root@controller ~]# neutron agent-list
neutron CLI is deprecated and will be removed in the future. Use openstack CLI instead.

I use vim /etc/neutron/plugins/ml2/linuxbridge_agent.ini check my linuxbridge_agent.ini:

[linux_bridge]
physical_interface_mappings = provider:enp2s0f0

[securitygroup]
enable_security_group = True
firewall_driver = neutron.agent.linux.iptables_firewall.IptablesFirewallDriver

[vxlan]
enable_vxlan = True
local_ip = 10.1.1.120
l2_population = True

In the /var/log/neutron/inuxbridge-agent.log:

 2017-12-09 11:11:10.656 8506 ERROR neutron.plugins.ml2.drivers.agent._common_agent     message = self.waiters.get(msg_id, timeout=timeout)
2017-12-09 11:11:10.656 8506 ERROR neutron.plugins.ml2.drivers.agent._common_agent   File "/usr/lib/python2.7/site-packages/oslo_messaging/_drivers/amqpdriver.py", line 238, in get
2017-12-09 11:11:10.656 8506 ERROR neutron.plugins.ml2.drivers.agent._common_agent     'to message ID %s' % msg_id)
2017-12-09 11:11:10.656 8506 ERROR neutron.plugins.ml2.drivers.agent._common_agent MessagingTimeout: Timed out waiting for a reply to message ID 64f066e39907443ca01235bcc8d8143e
2017-12-09 11:11:10.656 8506 ERROR neutron.plugins.ml2.drivers.agent._common_agent
2017-12-09 11:11:10.658 8506 WARNING oslo.service.loopingcall [-] Function 'neutron.plugins.ml2.drivers.agent._common_agent.CommonAgentLoop._report_state' run outlasted interval by 30.07 sec
2017-12-09 11:12:10.661 8506 ERROR neutron.plugins.ml2.drivers.agent._common_agent [-] Failed reporting state!
2017-12-09 11:12:10.661 8506 ERROR neutron.plugins.ml2.drivers.agent._common_agent Traceback (most recent call last):
2017-12-09 11:12:10.661 8506 ERROR neutron.plugins.ml2.drivers.agent._common_agent   File "/usr/lib/python2.7/site-packages/neutron/plugins/ml2/drivers/agent/_common_agent.py", line 131, in _report_state
2017-12-09 11:12:10.661 8506 ERROR neutron.plugins.ml2.drivers.agent._common_agent     True)
2017-12-09 11:12:10.661 8506 ERROR neutron.plugins.ml2.drivers.agent._common_agent   File "/usr/lib/python2.7/site-packages/neutron/agent/rpc.py", line 87, in report_state
2017-12-09 11:12:10.661 8506 ERROR neutron.plugins.ml2.drivers.agent._common_agent     return method(context, 'report_state', **kwargs)
2017-12-09 11:12:10.661 8506 ERROR neutron.plugins.ml2.drivers.agent._common_agent   File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/client.py", line 169, in call
2017-12-09 11:12:10.661 8506 ERROR neutron.plugins.ml2.drivers.agent._common_agent     retry=self.retry)
2017-12-09 11:12:10.661 8506 ERROR neutron.plugins.ml2.drivers.agent._common_agent   File "/usr/lib/python2.7/site-packages/oslo_messaging/transport.py", line 97, in _send
2017-12-09 11:12:10.661 8506 ERROR neutron.plugins.ml2.drivers.agent._common_agent     timeout=timeout, retry=retry)
2017-12-09 11:12:10.661 8506 ERROR neutron.plugins.ml2.drivers.agent._common_agent   File "/usr/lib/python2.7/site-packages/oslo_messaging/_drivers/amqpdriver.py", line 458, in send
2017-12-09 11:12:10.661 8506 ERROR neutron.plugins.ml2.drivers.agent._common_agent     retry=retry)
2017-12-09 11:12:10.661 8506 ERROR neutron.plugins.ml2.drivers.agent._common_agent   File "/usr/lib/python2.7/site-packages/oslo_messaging/_drivers/amqpdriver.py", line 447, in _send
2017-12-09 11 ...