An NSX Data Center for vSphere edge gateway provides a routed organization virtual data center network with connectivity to external networks and can provide services such as load balancing, network address translation, and a firewall. VMware Cloud Director supports IPv4 and IPv6 edge gateways.
Starting with VMware Cloud Director 9.7, the compute workload and the networking workload are isolated by using different vSphere resource pools and storage policies. Edge gateways reside on edge clusters that you must previously create. See Working with NSX Data Center for vSphere Edge Clusters.
You can migrate legacy edge gateways to the corresponding edge clusters by redeploying these edge gateways. See Redeploy an Edge Gateway.
Starting with version 9.7, VMware Cloud Director supports only advanced edge gateways. You must convert any legacy non-advanced edge gateway to an advanced gateway. See https://kb.vmware.com/kb/66767.