Hi, The following fix added to the RHOSP 15, "Upgrading Red Hat OpenStack Platform" guide: During updates, if the Open vSwitch (OVS) major version changes (for example, 2.9 to 2.11), director renames any user-customized configuration files with an .rpmsave extension, and installs the default OVS configuration. If you want to retain your earlier OVS customizations, you must manually reapply your modifications contained in the renamed files (for example, logrotate configurations in /etc/logrotate.d/openvswitch). This two-step update method avoids data plane interruptions that would be triggered by an automatic RPM package update. Customers can now see this content on the Red Hat Cudtomer Portal, here: https://access.redhat.com/documentation/en-us/red_hat_openstack_platform/15/html-single/upgrading_red_hat_openstack_platform/index#before-starting-the-upgrade Thanks, --Greg