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What Is the Effect of Using the Router# Copy Running-Config Startup-Config Command on a Router?
The router# copy running-config startup-config command is a vital command used on routers to save the current running configuration to the startup configuration. The running configuration includes all the changes made to the router’s configuration since the last boot, while the startup configuration represents the saved configuration that is loaded when the router boots up. Understanding the effect of this command is crucial for network administrators, as it ensures that any changes made to the router’s configuration are persisted across reboots.
When the router# copy running-config startup-config command is executed, several important effects take place:
1. Configuration Persistence: The most significant effect of this command is that it saves the current running configuration to the startup configuration. This means that any changes made to the router’s configuration, such as interface settings, routing protocols, or access control lists, are saved and will remain in effect even after a reboot.
2. Configuration Backup: By copying the running configuration to the startup configuration, network administrators ensure that a backup of the current configuration is available in case of any unexpected issues or failures. This allows for easy recovery and restoration of the router’s configuration.
3. Consistency across Reboots: Using the copy running-config startup-config command ensures that the router consistently loads the same configuration each time it boots up. This is important for maintaining network stability and preventing any configuration-related issues.
4. Configuration Replication: The command also enables the replication of the running configuration to other routers in a network. By copying the running configuration to the startup configuration, it can be synchronized with other routers, ensuring consistency across the network.
5. Configuration Verification: Executing the copy running-config startup-config command provides a way to verify that the current configuration is correctly saved and will be loaded upon the next boot. This is particularly useful in complex network environments where multiple changes are made frequently.
FAQs:
1. Is it necessary to use the copy running-config startup-config command after making configuration changes?
– Yes, it ensures that the changes made to the router’s configuration are saved and persist across reboots.
2. Can I use the command to revert to a previous configuration?
– No, the command only saves the current running configuration. To revert to a previous configuration, you need to manually load the desired configuration.
3. What happens if I don’t save the configuration before rebooting the router?
– The router will load the startup configuration, which might not include the latest changes made to the running configuration.
4. Can I use this command to copy the configuration to a TFTP server?
– No, the copy running-config startup-config command only saves the configuration locally on the router. To copy it to a TFTP server, use the copy running-config tftp command.
5. Is it possible to automate the execution of this command?
– Yes, you can use scripting languages or configuration management tools to automate the process of saving the configuration.
6. How can I view the contents of the startup configuration?
– Use the show startup-config command to display the contents of the startup configuration.
7. Does the router# copy running-config startup-config command require any special privileges?
– Yes, you need administrative privileges or appropriate access rights to execute this command.
8. Can I use the command in a Cisco switch as well?
– Yes, the command can also be used on Cisco switches to save the running configuration to the startup configuration.
9. What is the opposite command to copy running-config startup-config?
– The opposite command is copy startup-config running-config, which copies the startup configuration to the running configuration, effectively loading a previously saved configuration.
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