If you’re just starting out with the Cisco ASA you’re in luck! The Cisco ASA has command modes that are very similar to that of a Cisco Router or Switch. In fact, you’re going probably enjoy some of the features that you’ll learn on the CLI that you can’t do on other devices. Let’s explore some of the ASA command modes.
The Cisco ASA has a ROM Monitor mode similar to that of the routers. You can use this mode to load a new OS or perform a password recovery. To access this mode hit the escape character when prompted during boot time.
User EXEC Mode
User EXEC mode is similar to that of user EXEC on a router or a switch. You’re limited in the commands you can enter, and you need to get into privileged EXEC to get anything worthwhile done. To move from user EXEC to privilege exec use the enable command. When prompted for a password, by default, you simply hit enter.
Privilege EXEC Mode
Privilege EXEC mode is the mode that allows you privilege access to the configuration commands. From this mode you can view the running and startup configuration files, you can move into global configuration mode and make administrative changes. To move from this mode to configuration mode enter the configure terminal command.
Configuration mode allows access to the interfaces and routing processes as well as all the global commands that apply to the device as a whole. What you’ll really appreciate in this mode is that you can enter show commands just as you would from privilege EXEC mode. To move from this mode to interface configuration mode enter the interface interface_type x/x command. To move from configuration mode to router configuration mode enter the router protocol option command.
Interface Configuration Mode
In interface configuration mode you can apply addresses to interfaces, bring the interface up, and apply other configuration parameters that apply to the specific interface that you have accessed. Like configuration mode you can also issue show commands in this mode.
Router Configuration Mode
Router configuration mode is where you will configure parameters pertaining to you routing protocol of choice. The Cisco ASA supports RIPv2, OSPF, and EIGRP. Like configuration mode you can also issue show commands in this mode.