Hi Lakshan,
AIX 7.1 provides a script to configure Kerberos, e.g.
# export
PATH=/usr/krb5/sbin:/usr/krb5/bin:/usr/bin:/etc:/usr/sbin:/usr/ucb:/usr/bin/X11:/sbin:/usr/java6/jre/bin:/usr/java6/bin
# config.krb5 -C -r
EXAMPLE.COM -d
example.com -c
ipa1.example.com -s
ipa1.example.com
This link might be helpful:
https://aerostitch.github.io/linux_and_unix/AIX/AIX-Security-Kerberos_Aut...
Its about AD integration, but it shows how it is supposed to work.
Hope this helps
Harri