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Networking service overview
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OpenStack Networking (neutron) allows you to create and attach interface
devices managed by other OpenStack services to networks. Plug-ins can be
implemented to accommodate different networking equipment and software,
providing flexibility to OpenStack architecture and deployment.

It includes the following components:

neutron-server
  Accepts and routes API requests to the appropriate OpenStack
  Networking plug-in for action.

OpenStack Networking plug-ins and agents
  Plug and unplug ports, create networks or subnets, and provide
  IP addressing. These plug-ins and agents differ depending on the
  vendor and technologies used in the particular cloud. OpenStack
  Networking ships with plug-ins and agents for Open vSwitch, Linux
  bridging, Open Virtual Network (OVN), SR-IOV and Macvtap.

  The common agents are L3 (layer 3), DHCP (dynamic host IP
  addressing), and a plug-in agent.

Messaging queue
  Used by most OpenStack Networking installations to route information
  between the neutron-server and various agents. Also acts as a database
  to store networking state for particular plug-ins.

OpenStack Networking mainly interacts with OpenStack Compute to provide
networks and connectivity for its instances.