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Understanding the Associated Password Rules for an Authorized Administrator

The authorized administrator is associated with a defined login class, and the administrator is assigned with all permissions. Data is stored locally for fixed password authentication.


We recommend that you not use control characters in passwords.

Use the following guidelines and configuration options for passwords and when selecting passwords for authorized administrator accounts. Passwords should be:

  • Easy to remember so that users are not tempted to write it down.

  • Changed periodically.

  • Private and not shared with anyone.

  • Contain a minimum of 10 characters. The minimum password length is 10 characters.

  • Include both alphanumeric and punctuation characters, composed of any combination of upper and lowercase letters, numbers, and special characters such as, “!”, “@”, “#”, “$”, “%”, “^”, “&”, “*”, “(“, and “)”. There should be at least a change in one case, one or more digits, and one or more punctuation marks.

  • Contain character sets. Valid character sets include uppercase letters, lowercase letters, numbers, punctuation, and other special characters.

  • Contain the minimum number of character sets or character set changes. The minimum number of character sets required in plain-text passwords in Junos FIPS is 3.

  • Contain the minimum number of characters required for a password. By default, Junos OS passwords must be at least 6 characters long. The valid range for this option is 10 to 20 characters.

  • If you are finished configuring the device, commit the configuration and exit:


For EX4100 Series devices, the default password algorithm is sha512, and it is not necessary to configure the authentication algorithm for plain-text passwords.

Weak passwords are:

  • Words that might be found in or exist as a permuted form in a system file such as /etc/passwd.

  • The hostname of the system (always a first guess).

  • Any words appearing in a dictionary. This includes dictionaries other than English, and words found in works such as Shakespeare, Lewis Carroll, Roget's Thesaurus, and so on. This prohibition includes common words and phrases from sports, sayings, movies, and television shows.

  • Permutations on any of the above. For example, a dictionary word with vowels replaced with digits (for example f00t) or with digits added to the end.

  • Any machine-generated passwords. Algorithms reduce the search space of password-guessing programs and so should not be used.

Strong reusable passwords can be based on letters from a favorite phrase or word, and then concatenated with other, unrelated words, along with additional digits and punctuation.


Passwords should be changed periodically.