CLI Reference Guide    LINE Configuration Commands 
 
Global configuration mode. 
When you need to increase or decrease the number of available VTY 
connections, use the above commands. 
Increase  the  number  of  available  VTY  connections  to  20.  The 
available VTY connections are numbered 0--19. 
Ruijie(config)# line vty 19 
Decrease  the  number  of  available  VTY  connections  to  10.  The 
available VTY connections are numbered 0-9. 
Ruijie(config)# line vty 10 
transport input 
To set the specified protocol under Line that can be used for communication, use the transport input command. 
Use default    transport    input to restore the protocols under Line that can be used for communication to the 
default value. 
transport    input    {all | ssh | telnet | none} 
default    transport    input 
Allow all the protocols under Line to be used for 
communication 
Allow only the SSH protocol under Line to be used 
for communication 
Allow only the  Telnet  protocol  under  Line to  be 
used for communication 
Allow none of protocols under Line to be used for 
communication 
By  default,  VTY  allows  all  the  protocols  to  be  used  for 
communication. The default value of other types of TTYs is NONE, 
indicating  that  no  protocols  are  allowed  for  communication.  After 
some protocols are set to be available for communication, use the 
default transport input command to restore the setting to the default 
value.