Welcome to the community !
You can connect a serial cable to it and reboot.
Press ctrl-c when prompted to get a boot menu.
Option #3 on the menuy will let you reset the root password.
Continue with a normal boot.
Login as root, then type 'setup' to reconfigure networking.
Hope there's an OS on it as you won't be able to get a fresh copy of Data ONTAP without a support contract.
Enjoy !
I hope this response has been helpful to you.
At your service,
Eugene E. Kashpureff
ekashp@kashpureff.org
Fastlane NetApp Instructor and Independent Consultant
http://www.fastlaneus.com/ http://www.linkedin.com/in/eugenekashpureff
(P.S. I appreciate points for helpful or correct answers.)