Global configuration mode
- Configuration is one of the commands that Privileged EXEC gives you access to. This implies that in order to update any Cisco device configuration, we must access yet another level of the Cisco IOS.
- You can instruct the Cisco IOS to configure the Cisco device using your terminal window by issuing the configure terminal command.
- Global Configuration is the name of the new level that you enter after completing this operation.
- You can use the “end” or “exit” commands to leave this mode. Additionally, you can press CTRL + Z on your keyboard.
- Most commands are available in this mode out of all modes that are available. This mode divides related commands into sub-configuration modes to manage these commands.
- IOS-specific sub-configuration modes exist. Cisco produces IOS software in a variety of versions. A sub-configuration mode that is present in one flavor of IOS might or might not be present in others.
- The most popular sub-configuration settings that are accessible across all IOS variants are listed in the table below.
Sub-configuration mode | Contains commands that are used to: – |
---|---|
Interface configuration mode | Configure a physical interface of the device |
Sub-interface configuration mode | Configure virtual interfaces |
Routing protocol configuration mode | Configure a routing protocol |
IP access list configuration mode | Configure the in-built security feature of the IOS |
Line configuration mode | Configure access modes of the IOS |
- As implied by the name, any configuration made at this level affects the Cisco router or switch globally. We can change the hostname of the router or switch, create a login banner, create a password to prompt users attempting to access Privileged EXEC, and many more configuration chores here.
- Additionally, you can enter a variety of sub-configuration modes at this level of the Cisco IOS hierarchy to apply certain configurations for things like interfaces, routing protocols, and EXEC lines.
- Features that have an impact on the entire system are subject to global configuration instructions. You can switch into global configuration mode by using the configure privileged EXEC command.
- When the global configuration mode is selected, Router(config)# appears as the router prompt. Then utilize the help system to show the global commands accessible. Follow these instructions to gain access to and list the router’s global configuration commands:
- At the terminal, from the privileged EXEC mode, enter global configuration mode.
- List the global configuration commands.
Common iOS Navigation Techniques in Cisco
An IOS mode is a collection of commands used to customize a set of related features or to manage a specific area of the device. IOS modes are also referred to as IOS access modes and IOS command modes. There are five IOS modes: global configuration mode, privileged EXEC mode, user EXEC mode, setup mode, and ROM Monitor mode. The first three modes are used to configure new settings, edit existing settings, and view the current settings. The following two modes are used, respectively, to configure the device initially and troubleshoot it in an emergency.