|High Availability / HA Deployment Configuration Selection|
The Layer 2 adjacent deployment provides the most direct and simplest method for the cluster to manage the VIP.
The primary server on the cluster responds to connections addressed to the VIP. All external connection requests are directed and serviced by the primary server. In this configuration, there is no need for a third-party server (i.e., load balancers, application delivery controllers, etc.) to manage the VIP; the cluster itself manages the VIP.
As shown in the following diagram, if the primary server fails or becomes disconnected, then the secondary server assumes the role of the primary and begin to respond to connections on the VIP address. In this example, the nodes in the cluster share a VIP as they change standby and primary roles.