| 2.2 |  | Starting a Router |
| 2.2.3 |  | Examining the initial router bootup |

| The examples in Figures - show information and messages displayed during initial bootup. This information will vary, depending on the interfaces in the router and the Cisco IOS release. The screens displayed in this graphic are for reference only and may not exactly reflect what the screen displays on the console. In Figure , the statement “NVRAM invalid, possibly due to write erase”, tells the user that this router has not been configured yet or that the NVRAM has been erased. A router must be configured, the configuration file saved to NVRAM, and then configured to use the NVRAM configuration file. The factory-default setting for the configuration register is 0x2102, which indicates that the router should attempt to load a Cisco IOS image from flash memory. In Figure , the user can determine the bootstrap version and the IOS version the router is using as well as the router model, processor, and the amount of memory the router contains. Other information listed in this graphic includes: The number of interfaces The types of interfaces The amount of NVRAM The amount of flash memory In Figure , the user has the option to enter setup mode. Remember, the primary purpose of the setup mode is to permit the administrator to install a minimal configuration for a router, unable to locate a configuration from another source.
| Web Links Router Setup and Startup http://csc.colstate.edu/summers/ NOTES/CS458/ chap11/tsld004.htm