H3C S5120-SI Series Operation Manual page 609

Perform no authentication to the users telnetting to the device, and specify the user privilege level
as 1. (This configuration brings potential security problem. Therefore, you are recommended to use
it only in a lab environment.)
<Sysname> system-view
[Sysname] user-interface vty 0 4
[Sysname-ui-vty0-4] authentication-mode none
[Sysname-ui-vty0-4] user privilege level 1
By default, when users telnet to the device, they can only use the following commands after passing the
authentication:
<Sysname> ?
User view commands:
cluster Run cluster command
display Display current system information
ping Ping function
quit Exit from current command view
ssh2 Establish a secure shell client connection
super Set the current user priority level
telnet Establish one TELNET connection
tracert Trace route function
After you set the user privilege level under the user interface, users can log in to the device through
Telnet without any authentication and use the following commands:
<Sysname> ?
User view commands:
cluster Run cluster command
debugging Enable system debugging functions
display Display current system information
ping Ping function
quit Exit from current command view
reset Reset operation
screen-length Specify the lines displayed on one screen
send Send information to other user terminal interface
ssh2 Establish a secure shell client connection
super Set the current user priority level
telnet Establish one TELNET connection
terminal Set the terminal line characteristics
tracert Trace route function
undo Cancel current setting
Authenticate the users logging in to the device through Telnet, verify their passwords, and specify
the user privilege levels as 2.
<Sysname> system-view
[Sysname] user-interface vty 0 4
[Sysname-ui-vty1] authentication-mode password
[Sysname-ui-vty0-4] set authentication password cipher 123
[Sysname-ui-vty0-4] user privilege level 2
By default, when users log in to the device through Telnet, they can use the commands of level 0 after
passing the authentication. After you set the user privilege level under the user interface, when users
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