Meaning of line vty 0 4 in configuration of Cisco Router or Switch

vty

While going through any Cisco Router or Switch configuration, we may come across the term of “line vty 0 4” or “line vty 0 15“.

Let’s discuss these keywords in more detail and their requirement in the configuration of the Cisco Router or Switches –

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VTY

The term “vty” stands for Virtual teletype. VTY is a virtual port and used to get Telnet or SSH access to the device.VTY is solely used for inbound connections to the device. These connections are all virtual with no hardware associated with them.

Related Blog – VTY Password

The abstract “0 – 4” means that the device can allow 5 simultaneous virtual connections which may be Telnet or SSH. In a way, we may say that 5 (0 – 4) are connection ports to the Router or Switch. In fact, we may have connection ports up to 16 (0 – 15).

Here is an example where we configure telnet access to a cisco device and password for telnet facility –

R3(config)#line vty 0 4
R3(config-line)#password Cisco
R3(config-line)#login
R3(config-line)#exit

 

For better understanding watch our video on line vty –

Related – What is CEF?

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