Would be ideal to have the possibility to specify the IP address when a load balancer is announced to a virtual site so that an anycast approach for CE models will be supported. Today there is a workaround specifying the sites one by one so it's technically already possible, it's just a matter of implementing the logic behind the gui/api of global controller. Alternative could be creating a concept of Virtual Network for CEs (maybe doable if/when Multitenant CEs will be available)