To fully drive home the concept of Neutron routers, floating IPs, and connectivity through the bridges, this section of the chapter is dedicated to a walkthrough that leverages the network foundation that has been laid so far. A VLAN provider network will be used as the external gateway network and a VLAN tenant network will be used for instances. A Neutron router will be used to route traffic from the tenant network to the Internet, and floating IPs will be used to provide direct connectivity to instances.
In this example, a Cisco ASA serves as the upstream network gateway and is connected to the Internet. The inside interface of the Cisco ASA has a configured IP address of 10.50.0.1/24 and will serve as the gateway for an external VLAN provider network created here.
The following diagram is the logical diagram of the network to be built as part of this demonstration:
Figure 6.1