Logical servers can redirect connections at login time.
Login Redirection lets you dynamically change the logical server group by adding or removing multiplex nodes to rebalance the workload as connections are redirected to servers in the logical server group at any given time. All redirection logic is contained in the client libraries and the server. There is no need to update existing applications. Applications will try to connect to any server in the multiplex, and if login redirection is turned on for the login policy in question, the connection will be redirected to the appropriate node in the logical server group.