You can create and configure a virtual data center group backed by NSX Data Center for vSphere with a common egress configuration, where you set a pair of edge gateways that act as an active and stand-by egress points for all participating virtual data centers.
Prerequisites
Verify that you are logged in as a System Administrator or a role with the VDC Group: Configure VDC Group right published to the organization.
Your system administrator must enable the target virtual data centers for cross-virtual data center networking.