Promjena konfiguracije pokretanja

Edukacije Brček

22 Jun 202407:07

Summary

TLDRThis video tutorial demonstrates how to save, erase, and reload configurations on a network switch using Packet Tracer's command-line interface. It covers essential commands like copying the running configuration to the startup configuration, managing the switch's hostname, setting up passwords, and erasing saved settings. Additionally, it explains how to revert back to a previously saved configuration if unwanted changes are made. By mastering these skills, users can ensure their configurations are preserved across reboots and maintain proper network setup.

Takeaways

🔐 To begin configuring a switch, enter the password at the command line interface prompt.
🔑 Use the command 'enable' followed by the password 'class' to enter privileged exec mode.
💻 Enter 'configure terminal' to switch to Global Configuration mode.
🏷️ Set the hostname of the switch using the command 'hostname S1'.
💾 To save the current configuration, use the command 'copy running-config startup-config'.
⚡ The running configuration is stored in RAM, while the startup configuration is stored in non-volatile memory (NVRAM).
📁 You can verify the saved configuration by using the 'dir' command to view storage locations like flash memory and NVRAM.
🚀 To reload the switch, use the 'reload' command, which will retain the saved configuration after reboot.
🛑 To erase the startup configuration, use the 'erase startup-config' command and confirm the action.
🔄 You can revert to a previous saved configuration by copying the startup configuration to the running configuration using 'copy startup-config running-config'.

Q & A

What command is used to enter privileged exec mode on a switch?
-The command to enter privileged exec mode is 'enable'.
How do you enter Global configuration mode from privileged exec mode?
-To enter Global configuration mode, you use the command 'configure terminal'.
What command is used to save the current running configuration to the startup configuration?
-The command to save the running configuration to the startup configuration is 'copy running-config startup-config'.
What is the difference between the running configuration and the startup configuration?
-The running configuration is the active configuration stored in RAM, while the startup configuration is stored in non-volatile memory (NVRAM) and is loaded when the switch restarts.
Why is it important to save the running configuration to the startup configuration?
-Saving the running configuration ensures that any changes made will persist after the switch is restarted, as the startup configuration is stored in non-volatile memory.
How can you verify the saved configuration file location?
-You can verify the location by using the command 'dir' followed by the storage type, such as 'nvram:', to list the files stored in NVRAM.
What happens if you reload the switch without saving the running configuration?
-If the running configuration is not saved to the startup configuration before reloading, any changes made will be lost, and the switch will revert to the last saved configuration in NVRAM.
How can you erase the saved startup configuration?
-To erase the startup configuration, use the command 'erase startup-config'.
What is the purpose of the 'reload' command in the context of switch configuration?
-The 'reload' command restarts the switch, applying the startup configuration as the active running configuration.
How can you restore the switch to its previous saved configuration without erasing the current running configuration?
-You can restore the previous saved configuration by copying the startup configuration to the running configuration using the command 'copy startup-config running-config'.

Outlines

00:00

💾 Saving Switch Configuration

This paragraph explains how to save the configuration on a Cisco switch using Packet Tracer. The process starts by logging into the switch with the enable password and entering global configuration mode. The host name of the switch is set to S1. To save the configuration, the user exits to privileged exec mode and uses the command 'copy running-config startup-config' to copy the running configuration (currently in RAM) to the startup configuration file (stored in NVRAM). This ensures the configuration persists after a switch restart. The user verifies the saved configuration by checking the NVRAM contents with the 'dir' command. An alternative, shorter command 'copy run start' is also demonstrated. Finally, the user shows how the configuration remains after a switch reload, confirming the save was successful.

05:02

🔄 Reverting to Previous Configuration

This paragraph demonstrates how to revert to a previous configuration on a Cisco switch. After making additional changes such as setting a console password and changing the host name to 'S1', the user decides to revert to the last saved state when the host name was 'my switch'. To do this, the user exits to privileged exec mode and issues the command 'copy startup-config running-config', which loads the previous startup configuration into RAM, effectively merging it with the current running configuration. The paragraph emphasizes the importance of knowing how to save configurations, revert to a previous state, and reload the switch.

Mindmap

Keywords

💡Switch

A switch is a networking device that connects devices together on a computer network, enabling them to communicate. In the video, the switch is used to demonstrate how to save and erase configurations. The switch's behavior and setup, such as host name and password configurations, are key aspects of the tutorial.

💡Privileged Exec Mode

Privileged Exec Mode allows advanced access to a switch, providing a user with permission to make configurations. In the video, the user types 'enable' to enter this mode, which is necessary before making changes like saving configurations or modifying the switch’s settings.

💡Global Configuration Mode

Global Configuration Mode is the mode where a user can make changes to the switch that affect its overall behavior, such as setting a hostname or configuring passwords. The command 'configure terminal' is used to enter this mode in the video, highlighting its central role in making system-wide adjustments.

💡Running Configuration

The running configuration is the current set of settings that the switch is using and stored in volatile RAM. In the video, it is shown how the running configuration can be copied to the startup configuration to preserve settings across reboots. The running configuration is volatile and will be lost if not saved.

💡Startup Configuration

The startup configuration is stored in non-volatile memory (NVRAM) and is the configuration that the switch loads when it boots up. The video explains how copying the running configuration to the startup configuration ensures that settings are not lost after a reboot.

💡NV RAM

NV RAM, or non-volatile RAM, is memory that retains data even after the device is powered off. In the video, the startup configuration is stored in NV RAM, allowing the switch to retain its settings after being restarted. This contrasts with the running configuration, which is stored in regular volatile RAM.

💡Command Shortening

Command shortening allows users to type abbreviated commands, which the system recognizes and completes. In the video, the command 'copy run start' is used as a shorter form of 'copy running-config startup-config,' showing how this feature makes the command-line interface more efficient.

💡Reload

Reloading refers to restarting the switch, which loads the startup configuration. In the video, the reload command is used to demonstrate how the configuration persists after a reboot if it has been saved to the startup configuration, indicating that the process worked as expected.

💡Erase Startup-Config

Erasing the startup configuration removes the saved configuration from NV RAM, returning the switch to its default state after a reboot. In the video, the command 'erase startup-config' is demonstrated, and upon reload, the switch no longer requires a password, indicating the configuration was erased.

💡Hostname

The hostname is the name assigned to a device for easy identification on the network. In the video, the switch’s hostname is set to 'S1' and later changed to 'my switch,' demonstrating how the hostname can be changed and how saving or reverting configurations can affect it.

Highlights

Begin saving switch configuration by entering privileged exec mode using the 'enable' command and entering the password.

Enter global configuration mode with 'configure terminal' and set the switch hostname to 'S1'.

To save the current configuration, exit global config mode and type 'copy running-config startup-config'.

Running configuration is stored in volatile RAM, while startup configuration is stored in non-volatile NVRAM.

Saving the configuration to NVRAM ensures it remains after a restart or power failure.

After typing 'copy running-config startup-config', press enter to accept the default startup configuration file name.

Verify the saved configuration using the 'dir' command, which lists storage options like flash memory and NVRAM.

Flash memory stores the IOS operating system, while NVRAM stores the startup configuration file.

Use 'copy run start' as a shortcut to save the configuration with command shortening.

The reload command restarts the switch, confirming that the configuration is retained after reboot by checking for the hostname and banner.

To erase the startup configuration, use the 'erase startup-config' command, which clears NVRAM.

Reloading the switch after erasing the startup config takes you directly to the switch prompt without authentication.

Changes like setting the console password and hostname can be saved using 'copy running-config startup-config'.

If you're unhappy with recent changes, revert to the last saved configuration by copying the startup config to the running config.

The startup config merges into the running config, restoring previous settings while keeping any unsaved changes intact.