![]() ![]() More detailed information and examples of how to navigate the IOS CLI hierarchy are offered on the 1841 router configuration specification Cisco’s page. Specific interface configuration commands are available once the user has switched to the particular interface configuration level. Once in the configuration branch, a user can enter the configuration system-level commands that apply to the entire router at the global configuration level. The configuration command options will not be available until the user has navigated to the configuration branch of the IOS CLI structure. ![]() In order to be able to configure the router, it is important to understand this hierarchy. Once an EXEC session is established, commands within Cisco IOS are hierarchically structured. Telnet does not offer a method for protecting packets. Also, be aware that if you configure a router via telnet, the password is sent in cleartext :/ Note: For security reasons, the router will not echo the password that is entered. The basic CLI modes that we will be referring to below are as follows: Router> <– User EXEC Mode Router# <– Privileged EXEC mode Router(config)# <– Global Configuration Mode Router(config-if)# <– Interface Configuration Mode Router(config-line)# <– Line Configuration line Mode (Please, keep on Reading the text below:) To return to the EXEC user level, type disables at the Router # prompt.Įntering a question mark ( ?) in the privileged EXEC level will now reveal many more command options than are available at the EXEC user level. When the correct activation password is entered, the prompt router will change to Router #, indicating that the user is now at the privileged EXEC level. If an activation password is configured, the router will then ask for the password. To switch to the privileged EXEC level, type enable at the Router> prompt. (This feature is called context-sensitive help.)Ĭritical commands (for example, configuration, and management) require the user to be at the privileged EXEC level. To list the commands available at the EXEC user level, type a question mark ( ?) At the Router> prompt. The EXEC user level does not contain all commands that can control (for example, reload or configure) the operation of the router. The right arrow ( >) at the prompt indicates that the router is at the EXEC user level. 1 presents a simple high-level schematic diagram of some IOS commands:įor example, when an EXEC session is started, the router will show a Router> prompt. To illustrate this hierarchy, this presents a simple high-level schematic diagram of some IOS commands IOS CLI hierarchy Command options and applications vary depending on the position within that hierarchy (Img from Cisco IOS basic usage) ![]()
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