If you wanted security on your routers, you can implement this security as well. See command list example below:
aaa new-model
aaa authentication login local_authen local
username johndoe secret secretpassword
line con 0
exec-timeout 5 0
login authentication local_authen
line vty 0 4
exec-timeout 5 0
login authentication local_authen
when you enter your username of choice, be sure to use the "secret" command rather than "password". Reason being - just using "password" only encrypts your password with a weak md5 hash. By using the "secret" command it uses a higher md5 encryption algorithm and is stated by Cisco to be impossible to crack.
This will give you a local username/password store. If (When) you decide to change passwords you will have to manually change it on each device. You can also implement TACACS+ or RADIUS authentication if you wanted to centralize account management. This example is for account management per device.
Also, be sure to implement the "service password-encryption" command as well. This will encrypt your passwords within the config output.
Please rate if this helps.
