3.1 Configuring a Router  
  3.1.6 Executing adds, moves, and changes  
If a configuration requires modification, go to the appropriate mode and enter the proper command. For example, if an interface must be enabled, enter global configuration mode, enter interface mode, and issue the command no shutdown.

To verify changes, use the show running-config command. This command will display the current configuration. If the variables displayed are not what was intended, the environment can be corrected by doing one or more of the following:

  • Issue the no form of a configuration command.
  • Reload the system to return to the original configuration file from NVRAM.
  • Copy an archived configuration file from a TFTP server.
  • Remove the startup configuration file with the erase startup-config, then restart the router and enter setup mode.

To save the configuration variables to the startup configuration file in NVRAM, enter the following command at the privileged EXEC prompt:

Router#copy running-config startup-config

 

Lab Activity

Lab Exercise: Making Configuration Changes

This lab is to configure some basic router settings and bring interfaces up and down.