© 2004 Cisco Systems, Inc. All rights reserved. Managing Your Network Environment Managing Router Startup and Configuration INTRO v2.0—9-1.

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Presentation transcript:

© 2004 Cisco Systems, Inc. All rights reserved. Managing Your Network Environment Managing Router Startup and Configuration INTRO v2.0—9-1

© 2004 Cisco Systems, Inc. All rights reserved. INTRO v2.0—9-2 Outline Overview Stages of the Router Power-On/Boot Up Sequence Internal Router Components How a Cisco Device Locates and Loads Cisco IOS and Configuration Files Configuration Register Summary

© 2004 Cisco Systems, Inc. All rights reserved. INTRO v2.0—9-3 Router Power-On Bootup Sequence 1.Perform power-on self test (POST). 2.Load and run bootstrap code. 3.Find the Cisco IOS software. 4.Load the Cisco IOS software. 5.Find the configuration. 6.Load the configuration. 7.Run the configured Cisco IOS software.

© 2004 Cisco Systems, Inc. All rights reserved. INTRO v2.0—9-4 Router Internal Components

© 2004 Cisco Systems, Inc. All rights reserved. INTRO v2.0—9-5 ROM Functions Contains microcode for basic functions

© 2004 Cisco Systems, Inc. All rights reserved. INTRO v2.0—9-6 Finding the Cisco IOS Image

© 2004 Cisco Systems, Inc. All rights reserved. INTRO v2.0—9-7 Loading the Cisco IOS Image from Flash Memory The flash memory file is decompressed into RAM.

© 2004 Cisco Systems, Inc. All rights reserved. INTRO v2.0—9-8 Loading the Configuration Load and execute the configuration from NVRAM. If no configuration is present in NVRAM, enter setup mode.

© 2004 Cisco Systems, Inc. All rights reserved. INTRO v2.0—9-9 Determining the Current Configuration Register Value Configuration register value in show version command

© 2004 Cisco Systems, Inc. All rights reserved. INTRO v2.0—9-10 Configuration register bits 3, 2, 1, and 0 set boot option. Check the configuration register value with the show version command. Configuration Register Values

© 2004 Cisco Systems, Inc. All rights reserved. INTRO v2.0—9-11 show version Command

© 2004 Cisco Systems, Inc. All rights reserved. INTRO v2.0—9-12 show flash Command

© 2004 Cisco Systems, Inc. All rights reserved. INTRO v2.0—9-13 Displays the current and saved configuration show running-config and show startup-config Commands

© 2004 Cisco Systems, Inc. All rights reserved. INTRO v2.0—9-14 Summary When a router boots up, it performs tests, finds and loads software, finds and loads configurations, and finally runs the software. The major internal components of a router include RAM, ROM, flash memory, NVRAM, and the configuration register. When a router boots up, it searches for the Cisco IOS software image in a specific sequence: location specified in the configuration register, flash memory, a TFTP server, and ROM. The configuration register includes boot information specifying where to locate the Cisco IOS software image. The register can be examined with a show command and change the register value with the config-register global configuration command.