To ensure high availability (HA), a built-in high availability (HA) mechanism has been implemented in v5.1, where two Edge Gateways are deployed to work in Active-Standby mode. The vSphere HA can be used in conjunction with the Edge Gateway HA to handle host failure scenarios.
The vCloud Networking and Security Manager manages the life cycle of both Active and Standby Edge Gateway instances and will push user configurations as they are made to both simultaneously. The Active Edge Gateway will push run-time state information to the Standby Edge Gateway.