Document URL:
https://docs.openshift.com/container-platform/4.6/installing/installing_bare_metal_ipi/ipi-install-installation-workflow.html#preparing-the-provisioner-node-for-openshift-install_ipi-install-installation-workflow

Describe the issue:
The script for configuring the network bridges embedded in the configuration is misleading.

For starters, the script relies on a DHCP server being available for the baremetal NIC. If one isn't, the system will become unreachable and need to be rescued form the console.

Then the script also assumes that a provisioning network is used, which might not always be the case.

Suggestions for improvement:
I suggest that the script should be replaced by a diagram of how networking should be configured. A link to RHEL 8 documentation and how to use nmcli could also be provided