> # Creating Users Guidelines

> The passphrase specified in the snmp-server user option and the password specified username option are synchronized.

> By default, the user account does not expire unless you explicitly configure it to expire. The expire option determines the date on which the user account is disabled. The date is specified in the YYYY-MM-DD format.

> When creating users, note the following guidelines:

> - You can configure up to a maximum of 256 users on a switch.
> - The following words are reserved and cannot be used to configure users: bin, daemon, adm, lp, sync, shutdown, halt, mail, news, uucp, operator, games, gopher, ftp, nobody, nscd, mailnull, rpc, rpcuser, xfs, gdm, mtsuser, ftpuser, man, and sys.
> - User passwords are not displayed in the switch configuration file.
> - If a password is trivial (short, easy-to-decipher), your password configuration is rejected. Be sure to configure a strong password as shown in the sample configuration. Passwords are case-sensitive. “admin” is no longer the default password for any Cisco MDS 9000 Family switch. You must explicitly configure a strong password.

> Caution | Cisco MDS NX-OS supports user names that are created with alphanumeric characters or specific special characters (+ [plus], = [equal], _ [underscore], - [hyphen], \ [backslash], and . [period]) whether created remotely (using TACACS+ or RADIUS) or locally. Local user names cannot be created with any special characters (apart from those specified). If a non-supported special character user name exists on an AAA server, and is entered during login, then the user is denied access.

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