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Chap 7 IOS Images

Chap 7 IOS Images

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Chap 7 IOS Images

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  1. Chap 7IOS Images Andres, Wen-Yuan Liao Department of Computer Science and Engineering De Lin Institute of Technology andres@dlit.edu.tw http://www.cse.dlit.edu.tw/~andres

  2. Overview • Cisco IOS software source options • Load IOS software onto the router • Maintain backup files • Upgrade IOS software • The functions of the conf. register

  3. The Basics of IOS Versions • Locating the Cisco IOS software • Configuration register values • The show version command

  4. Locating the Cisco IOS software • The default source depends on the hardware platform • The router looks to the boot system commands saved in NVRAM

  5. NVRAM • Configuration register: Boot field • ROM moniter / ROM / Boot system command • Router#config-register • Boot system command • Flash/TFTP/ROM • Router(config)#boot system

  6. Boot system • Global configuration-mode boot system commands to enter fallback sources for the router to use in sequence

  7. Configuration register values • Configuration register:boot field • Determine the order in which the router looks for system bootstrap information • Router#config-register • Change the default configuration register setting

  8. Configuration register values • The configuration register is a 16-bit register in NVRAM • The lowest 4 bits • bits 3,2,1,0: the boot field • show version: verify the config-register command

  9. (default)

  10. The show version command • Displays information about the Cisco IOS software version (system image) • The configuration register and the boot field setting

  11. Bootstrap Options in Software • Boot system commands • Preparing for the use of TFTP • The show flash command

  12. Preparing for the use of TFTP • A TFTP server will allow image and conf. uploads and downloads over the network • Another router or host system

  13. The show flash command • Verify that you have sufficient memory on your system for the Cisco IOS software • Always backup your current IOS before upgrading to a newer version

  14. IOS Naming and Software Image Backup • Cisco's IOS naming conventions • The copy flash tftp command • The copy tftp flash command • How to load a software image backup

  15. Cisco's IOS naming conventions • These images accommodate the various platforms, available memory resources, and feature set needs customers have for their network devices

  16. The copy flash tftp command • show flash command to learn the name of the system image file (xk09140z) • copy flash tftp command to copy the system image to a TFTP server

  17. The copy tftp flash command • copy tftp flash • Download the new image from the TFTP server • Flash memory for more than a single Cisco IOS image

  18. Exclamation point (!) : successfully transferred Vs: successful checksum verification

  19. Summary • Configuration commands in NVRAM • The show version command • IOS: Flash/TFTP server/ROM • show flash • Naming convention • copy flash tftp/copy tftp flash