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See:- https://www.linux.com/community/blogs/133-general-linux/861814-rdo-liberty-set-up-for-three-nodes-controllernetworkcompute-ml2aovsavxlan-on-centos-71
Get concept of using several pre-created libvirt networks for VMs setup as RDO nodes.
Then update answer-file corespondently. Also have VTEPS endpoints IPs setup, before running packstack.
Make OVS configuration for in/outbound connectivity on Controller/Network Node.
In general VM running Controller/Network is supposed to 3 VNICs

1. Exeternal
2. Management.
3. VTEP's

Otherwise , your External net would be the same as Mgmt net.

See:- https://www.linux.com/community/blogs/133-general-linux/861814-rdo-liberty-set-up-for-three-nodes-controllernetworkcompute-ml2aovsavxlan-on-centos-71
Get concept of using several pre-created libvirt networks for VMs setup as RDO nodes.
Then update answer-file corespondently.

CONFIG_CONTROLLER_HOST=192.169.142.127
CONFIG_COMPUTE_HOSTS=192.169.142.137
CONFIG_NETWORK_HOSTS=192.169.142.127

Also have VTEPS endpoints IPs setup, before running packstack.
Make OVS configuration for in/outbound connectivity on Controller/Network Node.
In general VM running Controller/Network is supposed to 3 VNICs

1. Exeternal
2. Management.
3. VTEP's

Otherwise , your External net would be the same as Mgmt net.