How enable root access on Nortel Switched Firewalls?

--> How enbale root access for Nortel Switched Firewalls?
Enabling root access for Nortel Switched Firewalls :
Generated a private and public keys using PuttyGen.

Enter the password and save the private and public keys as shown below :

Then login to Nortel switched Firewall using CLI and then create Advance user and add public key to the user created and then enable the user as shown below :

>> SSH Users# pwd

/cfg/sys/user/adv

SSH Users# .

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[SSH Users Menu]

      user       - SSH User Admin Menu

 SSH Users# user

Enter user name: user1

Creating SSH User user1

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[SSH User user1 Menu]

      name       - Set Full name of User

      pubkey     - Set RSA/DSA Public Key for User

      ena        - Enable User Account

      dis        - Disable User Account

      del        - Remove SSH User

 SSH User user1# ena

 SSH User user1#

SSH User user1# pubk

Current value: none [AAAAB3NzaC1yc2EAAAABJQAAAIBvHMOHRmoeQawNAUl5hMbEJ37xsyLn55vPhBFD]

Enter RSA/DSA public key for user: ssh-rsa AAAAB3NzaC1yc2EAAAABJQAAAIEApSFofqqzTufUwtj1KDzRtU5rGWcUoQUK7oNamyiWzv6nXp6Hw4/WL49l2zKaO6InuMAJnQL+PS1lmyXwh3mP1oOl7Tvt9U3F23iKihayyoVdVM/m5vKXSAQMRHzLHOhtdBhbyOlDZkkBu8v4rbtJUzw4R2TxFg3B3UaOuq2VlU8= rsa-key-20090526

 SSH User user1#

Now Connecting to Nortel Switched Firewall :