How to add IPv4 source routing rules to Red Hat OpenStack Overcloud

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Issue

IP routes that are manually written to /etc/sysconfig/network-scripts/route-* are overwritten when openstack overcloud deployment is re-run.
What is needed on Overcloud nodes to route network traffic such that the packets go out via the same interface they came in?

Environment

Red Hat OpenStack Platform (OSP) 10

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