The network topology

At first, choosing the right network setup can be challenging, especially in a large environment, when you consider different networks and node clusters. Generally, a good practice for a first successful step is to make it as simple as possible. Overengineering a network setup might bring more troubleshooting tasks while running in production rather than extending it. Thus, we will go for a simpler setup in two phases—the OpenStack network mode and the physical network topology.

The OpenStack network mode

We will proceed with our setup by using Neutron as the OpenStack network manager. We intend to take advantage of the several technologies that are offered by Neutron, which includes switching and routing first and load balancing the features later on. Basically, we aim to separate traffic for each tenant in a private network and enable the VM for each tenant to reach the default gateway of the router device that faces the public network. The former "per tenant routers...