3-3 
To do…  Use the command…  Remarks 
Set the history command buffer 
size 
history-command 
max-size value 
Optional 
The default history command 
buffer size is 10, that is, the history 
command buffer of a user can 
store up to 10 commands by 
default. 
Set the timeout time of the VTY 
user interface 
idle-timeout minutes 
[ seconds ] 
Optional 
The default timeout time of a user 
interface is 10 minutes. 
With the timeout time being 10 
minutes, the connection to a user 
interface is terminated if no 
operation is performed in the user 
interface within 10 minutes. 
You can use the idle-timeout 0 
command to disable the timeout 
function. 
 
Telnet Configurations for Different Authentication Modes 
Table 3-3 Telnet configurations for different authentication modes 
Authentication 
mode 
Authentication related configuration  Description 
None  Set the authentication mode to none 
Refer to 
Console Port Login 
Configuration with
 
Authentication Mode Being
 
None
. 
Set the authentication mode to local 
password authentication 
Password 
Set the password for local authentication 
Refer to 
Console Port Login 
Configuration with
 
Authentication Mode Being
 
Password
. 
Set the authentication mode to scheme 
Specify to perform local authentication or 
remote authentication 
Scheme 
Set user names and passwords locally or 
on AAA Server 
Refer to 
Console Port Login 
Configuration with
 
Authentication Mode Being
 
Scheme
.