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The Cisco User Interface
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A large part of this text will be devoted to entering configuration, reporting, or other commands, and viewing the router's responses To do this efficiently in practice, it will help you to know how the Cisco user interface works Think of this as similar to learning DOSKEY in the PC world or the vi editor in the Unix world It's important to know at the beginning that you do not have to type in the entire command for the router to know what to do for you As long as you type enough to identify a unique command, the router will accept it Here's an example: Hostname#wri t This is the abbreviation for the command write terminal; the string wri t is enough information for the router to interpret the command correctly, and, as we shall see later, this command will cause the router to display its configuration to the screen Assuming you have connected a terminal to the console port of a previously configured router, you will be presented with a password or router prompt After entering an appropriate password, if necessary, the display will look something like this: Hostname> At this stage, we can start to enter commands In the Cisco user interface, there are two levels of access: user and privileged The first level of access that allows you to view router status is known as user EXEC mode The privileged mode is known as privileged EXEC mode This mode is needed to view router configuration, change configuration, and run debugging commands Privileged EXEC mode often is referred to as Enable mode because, in order to get into privileged EXEC mode, you have to enter the enable command followed by an appropriate password This is achieved as follows: Hostname>enablePress the Enter key password:Supply the Enable password, then press Enter Hostname# The visual evidence that you now have Enable privilege is that the command prompt has now changed to a # character alone Before we proceed, you also need to be aware that the router can be in one of two modes The first is what I will term view mode With this mode, you can enter the show and debug commands This allows you to view the status of interfaces, protocols, and other items related to the router It is the mode that the router will be in after you first log on The second is configuration mode This allows you to alter the configuration running in the router at that time This is important to realize, because as soon as you press the Enter key after entering a configuration command, that command takes immediate effect even before you leave configuration mode You can get into configuration mode only after gaining Enable privilege This is achieved as follows:
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Hostname#config terminalPress Enter Enter configuration commands, one per line End with Ctrl/Z Hostname(config)# Note that the line telling you to end with Ctrl-Z is echoed back by the computer The command to get into configuration mode in this case tells the router that it is to be configured from the terminal The router also can be told to get its configuration from a network server; this will be covered later You will notice that the prompt changes to remind you that you are in configuration mode The following is an example of how to enter configuration commands for the Ethernet 0 interface: Hostname(config)#interface ethernet0Press the Enter key Hostname(config-int)# To move back one level, type in the following: Hostname(config-int)#exitPress the Enter key Hostname(config)# If you wish to exit configuration mode from any level, simultaneously hold down the Ctrl and press the Z key: Hostname(config-int)<Ctrl-Z>Press the Enter key Hostname# To exit Enable mode, type in the following: Hostname#exitPress the Enter key Hostname> You now have the basics for navigating the user interface ShortcutsThe following lists the more useful of the available keystrokes for the Cisco IOS If <Ctrl-x> appears, it means you should hold down the Ctrl while pressing the character x key Arrow Keys The arrow keys are useful only with an ANSI/VT100-emulating terminal The up and down keys display the command history; for example, pressing the up arrow will display the previous command By default, 10 commands are kept in the history If you want to change that, go into configuration mode and type in terminal history xx, where xx is the number of commands to remember The down arrow key will go forward in the command history If you are not using an ANSI/VT100 terminal or emulation, the command history can still be
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in the command history Backspace or DEL Either of these keys deletes the character before the cursor Tab or Enter Each of these keys executes the command entered The Key Possibly the most useful key in the user interface, the " " key, can be entered at any time to find out what can be entered next This is best illustrated with an example: Hostname>show ip route bgp Connected egp eigrp igrp isis ospf rip static summary supernets-only Hostname>show ip route After the question mark is entered, the router informs you of the options available to complete the command, and re-enters the command typed in so far, so that all you need to do is select the appropriate option As soon as you see a <cr> option in the available command listing, you know that you can press the Enter key and the router will execute the command A point to note here is that if the list of options extends past one screen, the last line of the display will show More Pressing the keyboard space bar will show the next page of information, and pressing the Enter key will show the next single line of information The following key combinations illustrate useful commands: <Ctrl-A> <Ctrl-B> <Ctrl-D> <Ctrl-H> Move cursor to beginning of line Move cursor back one character Delete the character the cursor is on Same as backspace, ie, delete the character before the cursor Press the Enter key Border Gateway Protocol Connected networks Exterior Gateways protocol Enhanced Interior Gateway Routing Protocol Interior Gateway Routing Protocol ISO is-is Open Shortest Path First Routing Information Protocol Static routes summary of all routes show supernet entries only
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