3.11. Logical Networks

There are two hosts called Red and White in a cluster called Pink in a data center called Purple. Both Red and White have been using the default logical network, ovirtmgmt for all networking functions. The system administrator responsible for Pink decides to isolate network testing for a web server by placing the web server and some client virtual machines on a separate logical network. She decides to call the new logical network network_testing.

First, she defines the logical network for the Purple data center. She then applies it to the Pink cluster. Logical networks must be implemented on a host in maintenance mode. So, the administrator first migrates all running virtual machines to Red, and puts White in maintenance mode. Then she edits the Network associated with the physical network interface that will be included in the bridge. The Link Status for the selected network interface will change from Down to Non-Operational. The non-operational status is because the corresponding bridge must be setup in all hosts in the cluster by adding a physical network interface on each host in the Pink cluster to the network_testing network. Next she activates White, migrates all of the running virtual machines off of Red, and repeats the process for Red.

When both White and Red both have the network_testing logical network bridged to a physical network interface, the network_testing logical network becomes Operational and is ready to be used by virtual machines.