Security banners are very important. An intruder has to be warned that he is tresspassing the border and breaking the law.
banner login *
UNAUTHORIZED ACCESS TO THIS DEVICE IS PROHIBITED
You have accessed $(hostname) on line $(line).
You must have explicit, authorized permission to access
or configure this device. Unauthorized attempts and
actions to access or use this system may result in civil
and/or criminal penalties. All activities performed on
this device are logged and monitored.
// Applied in global configuration mode.
The variables $(hostname) and $(line) are optional and work only on routers.By privilege15