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This happens mainly because of neutron configurations, Please make sure that following steps are done in corresponding server's.

in the neutron controller node the softlink is made correctly.

 ln -s /etc/neutron/plugins/ml2/ml2_conf.ini /etc/neutron/plugin.ini

and in network node

 ln -s /etc/neutron/plugins/ml2/ml2_conf.ini /etc/neutron/plugin.ini

cp /usr/lib/systemd/system/neutron-openvswitch-agent.service /usr/lib/systemd/system/neutron-openvswitch-agent.service.orig
sed -i 's,plugins/openvswitch/ovs_neutron_plugin.ini,plugin.ini,g' /usr/lib/systemd/system/neutron-openvswitch-agent.service

This happens mainly because of neutron configurations, Please make sure that following steps are done in corresponding server's.

in the neutron controller node the softlink is made correctly.

 ln -s /etc/neutron/plugins/ml2/ml2_conf.ini /etc/neutron/plugin.ini

and in network node

 ln -s /etc/neutron/plugins/ml2/ml2_conf.ini /etc/neutron/plugin.ini

cp /usr/lib/systemd/system/neutron-openvswitch-agent.service /usr/lib/systemd/system/neutron-openvswitch-agent.service.orig
sed -i 's,plugins/openvswitch/ovs_neutron_plugin.ini,plugin.ini,g' /usr/lib/systemd/system/neutron-openvswitch-agent.service

I was not able to go through the entire updates, but for the issue between the neutron router's have you tried disabling the firewall and disabling the selinux in all the server's. its not a exact solution but we can at-least remove firewall and selinux from our further troubleshooting. Also make sure that keepalived is installed in both neutron server.