[wallaby][neutron][ovn] MTU in Neutron for Production

Hi, I am using Openstack Wallaby release on Ubuntu 20.04. I am configuring openstack neutron for production. While setting mtu I am a bit confused between the 2 use cases. *Case 1* External (public) network mtu 1500 self service (tenent) network geneve mtu 9000 VLAN external network mtu 1500 *Case 2* External (public) network mtu 9000 self service (tenent) network geneve mtu 9000 VLAN external network mtu 9000 I just want to know which case would be better for production. I would really appreciate any input in this regard. Thank you. Regards, Malik Obaid