What is the command-line interface utilized on a Cisco router?
The CLI is the contraction of the Cisco IOS command-line interface believed to be the prime user interface utilized for monitoring, configuring, and maintaining Cisco devices. This user interface would permit you to and directly execute Cisco IOS commands, whether using a router console or terminal or utilizing remote access methods.
We would be discussing the basic features of the Cisco IOS CLI and how to utilize them. Topics that would be covered, including the introduction to Cisco IOS command modes, navigation, and editing features, help features, and command history features.
Additional user interfaces would be including the Setup mode utilized for the first-time startup, the Cisco Web Browser, and user menus configured by a system administrator. For information about Setup mode, see using the Setup Mode to Configure a Cisco Networking Device and utilize AutoInstall to Configure Cisco Networking Devices Remotely. For details on issuing commands utilizing the Cisco Web Browser, see using the Cisco Web Browser User Interface. For information on user menus, you could observe Managing Connections, Menus, and System Banners.
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For an inclusive depiction of the user interface commands, observe the Cisco IOS Configuration Fundamentals Command Reference.
Finding Feature Information
Your software release might not sustain all the features documented in this module. For the latest feature and caveat information, scrutinize Bug Search Tool as well as the release notes for your platform and software release. To find information about the features documented in this module and observe a list of the releases in which each feature would be supported, follow the feature information table at the end of this module. Utilize Cisco Feature Navigator for pronouncement the information about platform support as well as Cisco software image support. An account on Cisco.com isn't required.
Cisco IOS XE CLI Command Modes Overview
To aid in Cisco devices' configuration, the Cisco IOS XE command-line interface would be divided into different command modes. Each command mode would have its own set of commands available for the configuration, maintenance, and monitoring of router and network operations. The commands available to you at any given time would be depending on the mode you are in. Entering a question mark at the router prompt, the system prompt would allow you to obtain a list of commands available for each command mode.
The utilization of specific commands would allow you to navigate from one command mode to another. The standard order that a user would access the modes would be as follows:
• user EXEC mode
• privileged EXEC mode
• global configuration mode
• specific configuration modes
• configuration submodes
• configuration subsubmodes.
When you commence a session on a router, you generally begin in user EXEC mode, which is considered one of two access levels of the EXEC mode. For security purposes, only partial subsets of EXEC commands would be available in user EXEC mode. This level of access would be reserved for tasks that don't change the router's configuration, like determining the router status.
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