A login banner is displayed whenever someone connects to the router by telnet or console connections.
The syntax for the banner command is:
banner motd {char} {banner text} {char}
where {char} is a special delimeter character that does not exist in the {banner text}. Everything contained between the first and second {char} characters, including carriage returns, is interpreted as the banner message. For example,
config t
banner motd #
******************************************
* Unauthorized access prohibited
******************************************
#
See the comments below for additional, amazing uses for this feature.
