How to specify MTU of OpenShift 4.x network in OpenStack IPI?

Solution Verified - Updated -

Issue

With OCP 4.3, there is no way to specify the MTU of the neutron network that is generated by terraform. Neutron allows administrators to generate networks with the --mtu parameter. The OpenShift installer uses the default MTU

This is critical when there are MTU mismatches elsewhere in the environment.

It doesn't matter if the problem lies within OpenStack or within the physical network: the OpenShift installer should provide an option so that one can configure the MTU of this network.

Environment

Red Hat OpenStack Platform 13
Red Hat OpenShift Platform 4.3

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