Enable and password protect telnet logins to Cisco routers
Contributed by qmchenry 
Tagged: Cisco router The ability to telnet to a Cisco router makes administration easier. This simple configuration enables telnet logins to the router and protects them with a password.
To enable telnet logins with the password PaSsWoRd:
conf t
line vty 0 4
login
password PaSsWoRd
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joeblow said on October 3, 2008
Don’t forget these passwords are sent in clear text when using telnet.
joeblow said on October 3, 2008
Also, if you are already on a cisco router and you want to connect and administrate another cisco router through telnet, you need to have made it available through line aux 0 instead of vty 0 4.
Allen said on November 7, 2008
follow your procedure, but i didn’t get the password prompt when i login again throught the telnet command. what’s the problem?