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Understanding Cisco Router Startup Sequence: A Comprehensive Guide

This guide details the startup sequence of Cisco routers, including key processes such as POST, bootstrap, and diagnostics. Learn how to load the operating system from various sources like Flash, TFTP server, or ROM, and how to load configuration files from NVRAM or console input. Familiarize yourself with essential commands like "show running-config", "reload", and "erase startup-config." We also cover the setup procedure, renaming routers, entering encrypted passwords, and practicing commands through lab activities. Essential for beginners and experienced users alike.

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Understanding Cisco Router Startup Sequence: A Comprehensive Guide

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  1. Cisco S2 C5 Router Startup

  2. Startup Sequence • Boot • Similar to DOS – POST, Bootstrap program & diagnostics • Load O/S • Can be found in Flash, TFTP server, or ROM • Load Configuration File • Can be found in NVRAM, TFTP, or entered from console

  3. Startup Commands • Router # show running-config • Router # show startup-config • Router # reload • Router # startup • Router # erase startup-config • The commands show config, write term, and write erase, used with Cisco IOS Release 10.3 can also be used for short term

  4. Setup Mode • [ ] indicate default value – press ENTER to accept • If no default, a ? Appears – enter your choice • CTRL+C will end the process and allow you to begin again • A YES response to the prompt will load the commands into RAM and save as startup-config file in NVRAM • You can turn features on with setup, but you cannot turn them off. • Setup does not support many of the advanced features of the router

  5. Global Parameters • Initial prompt is router > • To rename router, from enable Exec mode • Router # hostname VKP • You can enter secret encrypted password as part of setup procedure • You can also enter secret encrypted passwords for virtual terminal

  6. Lab Activity • Startup router using default startup • Do this at least twice • Make certain you understand procedure • Record notes in your journal

  7. Challenge Lab • Subnet IP address • Program routers using setup mode • Practice commands learned to date • A list will be given to you in class

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