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Works as intended.
a) clients (11.2) connect to the DB using the SCAN address - on the event of failover, the service is removed from the SCAN listener, so it will not forward requests to the failed VIP - No problem here.
b) clients (pre 11.2, but works for 11.2 also of course) have a list of VIP addresses - When a client tries to connect through a failed VIP, it will immediately get the reply that there is no listener there, so it can try another address without wasting time.
Anything else than the above is not a proper HA configuration.
"A VIP address is an alternate public address that client connections use instead of the standard public IP address. If a node fails, then *the node's VIP address fails over to another node but there is no listener listening on that VIP, so a client that attempts to connect to the VIP address receives a connection refused error (ORA-12541) instead of waiting for long TCP connect timeout messages. This error causes the client to quickly move on to the next address in the address list and establish a valid database connection.*"