# Adding AAA User Entries to Local User Databases

The local authentication server uses the information in a local user database to authenticate a subscriber. A local user database can contain information for multiple users.

The E Series router provides two commands for adding entries to local user databases: the username command and the aaa local username command. You can specify the following parameters:

- Username—Name associated with the subscriber.
- Passwords and secrets—Single words that can be encrypted or unencrypted. Passwords use two-way encryption, and secrets use one-way encryption. Both passwords and secrets can be used with PAP authentication; however, only passwords can be used with CHAP authentication.
- IP address—The IP address to assign to the subscriber (aaa local username command only).
- IP address pool—The IP address pool used to assign the subscriber’s IP address (aaa local username command only).
- Operational virtual router—The virtual router to which the subscriber is assigned. This parameter is applicable only if the subscriber is authenticated by the default virtual router (aaa local username command only).