You can configure a banner message to appear at the beginning of a Telnet session to a storage system.
You configure a banner message to appear at the beginning of a Telnet session to a storage system by creating a file called issue in the /etc directory of the administration host’s root volume. The message only appears at the beginning of the session. It is not repeated if there are multiple failures when attempting to log in.
admin_host% telnet toaster Trying 172.15.95.97.49... Connected to toaster.xyz.com Escape character is ‘^]’. This system is for demonstrations only. Data ONTAP <toaster.xyz.com> Login: