I forgot to use -u db2fenc1 option while issuing db2iupgrade option while upgrading an instance from 9.5 to 9.7.
Instead of using
/opt/IBM/db2/V9.7/instance/db2iupgrade -u db2fenc1 <instancename>
I used
/opt/IBM/db2/V9.7/instance/db2iupgrade <instancename>
But still the instance got migrated. Does this create any issues ?