TAF Service in RAC 10g

Hi Experts,
i need your guidance. actually we have oracle 10g (10.2.0.4) RAC running with three nodes on AIX6.1 64bit. and TAF service is not configured. problem is this, when one of three node get down due to any reason, say for maintainence. then client are still trying to connect with down node. and when they try to connect with down node then they face delay in connection. below is the service that is being used in client side.
orcl =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = node1_vip)(PORT = 1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = node2_vip)(PORT = 1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = node3_vip)(PORT = 1521))
(LOAD_BALANCE = yes)
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = orcl)
(FAILOVER_MODE =
(TYPE = SELECT)
(METHOD = BASIC)
(RETRIES = 180)
(DELAY = 5)
1- question is why client go to down node and face delay in connection.
2- we should configure TAF service to overcome this ? what is the function of TAF service if any recommended MOS or other doc is available please share it
regards,

http://download.oracle.com/docs/cd/B19306_01/network.102/b14212/advcfg.htm#sthref1280
On Metalink/MOS there's doc [ID 334471.1] amongst others, but just do a search on 'TAF' yourself and you'll find many articles.

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