3Com 4500 PWR 26-Port Configuration Manual page 37

Authentication
method
Password
Username and
password
A 3Com switch provides multiple VTY user interfaces. At one time, only one user can telnet to a VTY
user interface. Because a remote terminal cannot select the VTY user interface through which it logs in
to the switch, it is recommended that you configure all VTY user interfaces with the same authentication
method. The following example is configured in this way.
The number of VTY user interfaces provided by a 3Com device varies by switch model. In this
document, a switch providing five VTY user interfaces is used as an example, which means that the
VTY user interface number ranges from 0 to 4. If your switch provides a different number of VTY user
interfaces, make sure that the VTY interface number you configure is within the actual range.
Telnet login configuration example
# Enter system view.
<Sysname> system-view
# Enable the telnet service.
[Sysname] telnet server enable
# Create VLAN-interface 1.
[Sysname] interface vlan-interface 1
# Assign an IP address to VLAN-interface 1 according to the IP network segment distribution and usage
in the current network. 192.168.0.72 is used as an example.
[Sysname-Vlan-interface1] ip address 192.168.0.72 24
[Sysname-Vlan-interface1] quit
# Enter the view of VTY user interfaces 0 through 4.
[Sysname] user-interface vty 0 4
Description
Easy to configure
Allows any user knowing the
password to telnet to your switch
Secure, but incapable of assigning
different privilege levels to different
users
Complex to configure
Allows users inputting the correct
username and password to telnet
to your switch
Most secure, and capable of
assigning different privilege levels
to different users
Application
scenarios
Environments that do
not need granular
privilege
management
Environments where
multiple operators
cooperate to manage
the device
1-6
Configuration