Learning OpenStack Networking (Neutron)

Physical server connections

The number of interfaces needed per host is dependent on the type of cloud being built and the security and performance requirements of the organization.

A single interface per server that results in a combined control and data plane is all that is needed for a fully functional OpenStack cloud. Many organizations choose to deploy their cloud this way, especially when port density is at a premium or the environment is simply used for testing. In production clouds, however, separate control and data interfaces are recommended.

Single interface

For hosts using a single interface, all traffic to and from instances as well as internal OpenStack, SSH management, and API traffic traverses the same interface. This configuration ...