How to configure NFS kerberized'

Hi all!

To configure NFS kerberized, what should I need?

I have a lab:

- 1 Active Directory - AD

- 1 cluster isilon simulator (join to AD), I have configured NFS kerberized share folder as same as attached images

- 1 red hat 6.5 client, I have configured "integrating red hat to AD" and mount nfs with option krb5:

#mount -t nfs -o nfsvers=4,sec=krb5   :/ifs/data/NFS    /tmp

mount.nfs: an incorrect mount option was specified

I need to test NFS kerberized function and the way I have done is true? I hope all help me, thanks!