I am trying to remove and disable line vty 5 to 15 on 3560. However, it gave me an error message "%Can't delete last 16 VTY lines". Is there a way to disable line vty 5 to 15? All other switch platforms take "no line vty 5 15" without any problem.
I dont think you can remove them on the 3560.
If you want to effectively disable those vty lines to prevent too many users from accessing the switch, you can use the transport input none command under line vty 5 15. This disables all protocols on the vty lines.