qr code c# free Interacting with the IOS in Objective-C

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Interacting with the IOS
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The CLI is a character- or text-based interface To interact with the CLI, you simply need to type in commands, just as you would do when typing an essay in a text editor or a message in an e-mail program You can even use functions such as cut and paste with the IOS CLI: you can copy the complete configuration from a router using a terminal emulator s copy function, paste this into a text editor, make changes to the configuration, select and copy the new configuration, and paste all of these commands back into the CLI The CLI supports a command parser Whenever you press the ENTER key, the IOS parses the command and parameters that you entered and checks for correct syntax and options When you paste multiple commands into the CLI, the IOS still performs this process for each command that is included in the paste function If you make a mistake with one command, the CLI parser will display an error message, but it will continue with the next command in the pasted list
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11: Cisco IOS Software
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Before making any configuration changes on your IOS device, you must first back it up! You ll learn how to do this across the network in 17, but you could easily do this by executing the show running-config command, copying this, and pasting it into a backup text file on your PC: make sure you don t modify this configurationThe backup text file can then be used if any changes you make don t behave the way you expect and you don t remember how to revert your running configuration back to the way it was before your changesTo do a restore, erase the configuration on your IOS device (erase startup-config), reboot your IOS device (reload), enter configuration mode once it boots up (enable and configure terminal), and then paste in your backed-up configuration By default, the interfaces on routers will be disabled and will have to be enabled (no shutdown)The IOS commands mentioned here are discussed later in this chapter and in 17
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CLI Access Modes
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Each Cisco device supports several access modes For CLI interaction, four modes are supported:
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User EXEC
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Provides basic access to the IOS with limited command availability (basically simple monitoring and troubleshooting commands) Provides high-level management access to the IOS, including all commands available at User EXEC mode Allows configuration changes to be made to the device Loads a bootstrap program that allows for low-level diagnostic testing of the IOS device, performing the password recovery procedure, and performing an emergency upgrade
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Of the four modes, the first three apply to the IOS While in ROMMON mode, the IOS has not loaded and therefore packets are not moved between interfaces of the device Both EXEC modes can be password-protected, allowing you to limit the people who can access your device to perform management, configuration, and troubleshooting tasks The next two sections introduce the two EXEC modes
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User EXEC Mode
Your initial access to the CLI is via the User EXEC mode, which has only a limited number of IOS commands you can execute Depending on the Cisco device s configuration, you might be prompted for a password to access this mode
Command-Line Interface (CLI)
This mode is typically used for basic troubleshooting of networking problems You can tell that you are in User EXEC mode by examining the prompt on the left side of the screen:
IOS>
If you see a > character at the end of the information, you know that you are in User EXEC mode The information preceding the > is the name of the Cisco device For instance, the default name of all Cisco routers is Router, whereas the 2960 switch s User EXEC prompt looks like this: Switch> These device names can be changed with the hostname command, which is discussed later in this chapter In the preceding example, I renamed the device IOS
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