To verify the Linux bridge network agents have properly checked in, issue the openstack network agent list command on the controller node:

The Neutron Linux bridge agents on the controller01 and compute01 nodes should be visible in the output with a state of UP. If an agent is not present, or the state is DOWN, you will need to troubleshoot agent connectivity issues by observing log messages found in /var/log/neutron/neutron-linuxbridge-agent.log on the respective host.