You can set a banner on a Cisco router so that when either a user logs into the router or an administrator telnets into the router,for example,a banner will give them the information you want them to have .Another reason for having a banner is to add a security notice to users dialing into your internetwork.
There are four different banners available:
Router (config) # banner ?
LINE c banner –text c,where ‘c’ is a delimiting character exec set EXEC process creation banner
incoming Set incoming terminal line banner
login Set login banner
motd Set Message of the Day banner
The Message of the day is the most used and gives a message to every person dialing in or connecting to the router via Telnet,auxiliary port,or console port.
Router (config) # banner motd ?
LINE c banner –text c,where ‘c’ is a delimiting character
Router (config) # banner motd #
Enter TEXT message.End with the character ‘#’.
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