To configure VMware Cloud Director Availability in the cloud site, you perform an initial configuration of the Cloud Service that registers with the VMware Cloud Director, with the vCenter Server Lookup service, with the Replicator Service instances, and with the Tunnel Service. Then you can proceed to pair cloud sites.
As a best practice, first configure all services in a single cloud site: register the Cloud Service with the VMware Cloud Director, with the vCenter Server Lookup service, with the Replicator Service instances in the same site, and with the Tunnel Service. Then to allow for pairing, perform the initial configuration and the registration in the second cloud site.
After configuring the VMware Cloud Director Availability services, you can validate that the setup is complete by opening the service management interface. In the System Monitoring page, the entries are green to indicate successfully configured services, and any red entries might indicate an incomplete setup.