3Com 5500-EI PWR Reference Manual page 1007

Parameters
username: SSH user name, a string of 1 to 184 characters. It cannot contain any of these characters:
slash (/), backslash (\), colon (:), asterisk (*), question mark (?), less than sign (<), greater than sign (>),
and the vertical bar sign (|). In addition, the @ sign can appear up to once, the username part (that is,
the string before the @ sign) cannot be more than 55 characters, and the domain name part cannot be
more than 128 characters.
Description
Use the ssh user command to create an SSH user.
Use the undo ssh user to delete a specified SSH user.
An SSH user is represented as a set of user attributes on the SSH server. This set is uniquely identified
with the SSH username. When a user logs in to the SSH server from the SSH client, a username is
required so that the server can looks up the database for matching the username. If a match is found, it
authenticates the user using the authentication mode specified in the attribute set. If not, it tears down
the connection.
An SSH user created with this command uses the default authentication type specified by the ssh
authentication-type default command. If no default authentication type is specified for SSH users, you
need to use the ssh user authentication-type command to create an SSH user and specify an
authentication mode for the user.
An SSH user is created on an SSH server for the purpose of specifying the authentication type, the SSH
service type, and the public key for the SSH user. An existing SSH user will be removed automatically if
it has none of the authentication type, the SSH service type, and the public key configured.
Related commands: ssh authentication-type default, ssh user authentication-type.
Examples
# Specify the default authentication type as password authentication. Create an SSH user with the
name "abc".
<Sysname> system-view
Enter system view, return to user view with Ctrl+Z.
[Sysname] ssh authentication-type default password
[Sysname] ssh user abc
# Display the SSH user information.
[Sysname] display ssh user-information abc
Username Authentication-type
1-31
User-public-key-name Service-type