Tnsora and listener_* param changes after 11g upgrade

We have a 2-node RAC instance RACINST1 and RACINST2 on nodes racnode1 and racnode2.

We have upgraded the database from 10.2.0.5 to 11gR2.

Before the upgrade here is the tns entry we use to remotely connect to our database.

RACINST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = racnode1vip)(PORT = 1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = racnode2vip)(PORT = 1521))
(LOAD_BALANCE = yes)
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = GNSTEST)
(FAILOVER_MODE =
(TYPE = SELECT)
(METHOD = BASIC)
(RETRIES = 180)
(DELAY = 5)
)
)
)

1) After the upgrade to 11g, do we need to change the tns entry?
We were wondering if we should replace racnode1vip and racnode2vip with the scan ip?