Login Command on CISCO Router/Switch

Command

Login

Use

Enables authentication for console connections to router. Contrary to what it may sound like, the no login command will actually disable authentication to the console port on the router. This means that anyone will be able to access the router without having to provide a password.

Syntax

Router(config-line)#login

Example

In this example, login is enabled for console access on R2. Notice that a password is also set before using the login command.

R2#conf t
Enter configuration commands, one per line. End with CNTL/Z.
R2(config)#
R2(config)#line con 0
R2(config-line)#password cisco
R2(config-line)#login

The configuration for the console port is shown with login enabled.

R2(config-line)#do show run | sec con
Building configuration…
Current configuration : 1460 bytes
control-plane
line con 0
exec-timeout 15 50
privilege level 15
password cisco
logging synchronous
login

If a password is not set before using login, a message is displayed notifying that a password needs to be set before login becomes active.

R2(config-line)#login
% Login disabled on line 0, until ‘password’ is set

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