Lecture 20 presentation
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The document discusses Cisco IOS software configuration registers, which are used to identify where a Cisco router boots its IOS image from. It explains that the configuration register value determines the boot option, such as booting from flash memory, a TFTP server, or ROM monitor mode. It also shows commands for configuring the boot system and checking the current configuration register value.
![Locating the Cisco IOS Software Configuration Registers Registers in NVRAM for modifying fundamental Cisco IOS software Identifies where to boot Cisco IOS image (for example, use config-mode commands) Router# configure terminal Router(config)# boot system flash IOS_filename Router(config)# boot system tftp IOS_filename tftp_address Router(config)# boot system rom [Ctrl-Z] Router# copy running-config startup-config](https://image.slidesharecdn.com/lecture20presentation-100917010007-phpapp02/85/Lecture-20-presentation-3-320.jpg)
![Locating the Cisco IOS Software Configuration Registers Registers in NVRAM for modifying fundamental Cisco IOS software Identifies where to boot Cisco IOS image (for example, use config-mode commands) Router# configure terminal Router(config)# boot system flash IOS_filename Router(config)# boot system tftp IOS_filename tftp_address Router(config)# boot system rom [Ctrl-Z] Router# copy running-config startup-config Boot system commands not found In NVRAM](https://image.slidesharecdn.com/lecture20presentation-100917010007-phpapp02/85/Lecture-20-presentation-4-320.jpg)
![Locating the Cisco IOS Software Configuration Registers Registers in NVRAM for modifying fundamental Cisco IOS software Identifies where to boot Cisco IOS image (for example, use config-mode commands) Router# configure terminal Router(config)# boot system flash IOS_filename Router(config)# boot system tftp IOS_filename tftp_address Router(config)# boot system rom [Ctrl-Z] Router# copy running-config startup-config Boot system commands not found In NVRAM Get default Cisco IOS software from Flash](https://image.slidesharecdn.com/lecture20presentation-100917010007-phpapp02/85/Lecture-20-presentation-5-320.jpg)
![Locating the Cisco IOS Software Configuration Registers Registers in NVRAM for modifying fundamental Cisco IOS software Identifies where to boot Cisco IOS image (for example, use config-mode commands) Router# configure terminal Router(config)# boot system flash IOS_filename Router(config)# boot system tftp IOS_filename tftp_address Router(config)# boot system rom [Ctrl-Z] Router# copy running-config startup-config Boot system commands not found In NVRAM Get default Cisco IOS software from Flash Flash memory empty](https://image.slidesharecdn.com/lecture20presentation-100917010007-phpapp02/85/Lecture-20-presentation-6-320.jpg)
![Locating the Cisco IOS Software Configuration Registers Registers in NVRAM for modifying fundamental Cisco IOS software Identifies where to boot Cisco IOS image (for example, use config-mode commands) Router# configure terminal Router(config)# boot system flash IOS_filename Router(config)# boot system tftp IOS_filename tftp_address Router(config)# boot system rom [Ctrl-Z] Router# copy running-config startup-config Boot system commands not found In NVRAM Get default Cisco IOS software from Flash Flash memory empty Get default Cisco IOS software from TFTP server](https://image.slidesharecdn.com/lecture20presentation-100917010007-phpapp02/85/Lecture-20-presentation-7-320.jpg)
![Locating the Cisco IOS Software ROM monitor Configuration Registers Registers in NVRAM for modifying fundamental Cisco IOS software Identifies where to boot Cisco IOS image (for example, use config-mode commands) Router# configure terminal Router(config)# boot system flash IOS_filename Router(config)# boot system tftp IOS_filename tftp_address Router(config)# boot system rom [Ctrl-Z] Router# copy running-config startup-config Boot system commands not found In NVRAM Get default Cisco IOS software from Flash Flash memory empty Get default Cisco IOS software from TFTP server](https://image.slidesharecdn.com/lecture20presentation-100917010007-phpapp02/85/Lecture-20-presentation-8-320.jpg)
![Configuration Register bits 3, 2, 1, and 0 set boot option Configuration Register Values Router#configure terminal Router(config)# config-register 0x2102 [Ctrl-Z] Router#reload](https://image.slidesharecdn.com/lecture20presentation-100917010007-phpapp02/85/Lecture-20-presentation-10-320.jpg)
![Configuration Register bits 3, 2, 1, and 0 set boot option Configuration Register Values Configuration-Register Value 0x0 Meaning Use ROM monitor mode (Manually boot using the b command) Router#configure terminal Router(config)# config-register 0x2102 [Ctrl-Z] Router#reload](https://image.slidesharecdn.com/lecture20presentation-100917010007-phpapp02/85/Lecture-20-presentation-11-320.jpg)
![Configuration Register bits 3, 2, 1, and 0 set boot option Configuration Register Values Configuration-Register Value 0x0 0x1 Meaning Use ROM monitor mode (Manually boot using the b command) Automatically boot from ROM (Provides IOS subset) Router#configure terminal Router(config)# config-register 0x2102 [Ctrl-Z] Router#reload](https://image.slidesharecdn.com/lecture20presentation-100917010007-phpapp02/85/Lecture-20-presentation-12-320.jpg)
![Configuration Register bits 3, 2, 1, and 0 set boot option Check Configuration Register setting with show version Configuration Register Values Configuration-Register Value 0x0 0x2 to 0xF 0x1 Meaning Use ROM monitor mode (Manually boot using the b command) Examine NVRAM for boot system commands (0x2 default if router has Flash) Automatically boot from ROM (Provides IOS subset) Router#configure terminal Router(config)# config-register 0x2102 [Ctrl-Z] Router#reload](https://image.slidesharecdn.com/lecture20presentation-100917010007-phpapp02/85/Lecture-20-presentation-13-320.jpg)
![Boot System Options in Software Router#configure terminal Router(config)# boot system flash c2500-js-l [Ctrl-Z] Router#copy running-config startup-config Flash](https://image.slidesharecdn.com/lecture20presentation-100917010007-phpapp02/85/Lecture-20-presentation-14-320.jpg)
![Boot System Options in Software Router#configure terminal Router(config)# boot system flash c2500-js-l [Ctrl-Z] Router#copy running-config startup-config Flash Network Router#configure terminal Router(config)# boot system tftp test.exe 172.16.13.111 [Ctrl-Z] Router#copy running-config startup-config](https://image.slidesharecdn.com/lecture20presentation-100917010007-phpapp02/85/Lecture-20-presentation-15-320.jpg)
![Boot System Options in Software Router#configure terminal Router(config)# boot system flash c2500-js-l [Ctrl-Z] Router#copy running-config startup-config Flash Network Router#configure terminal Router(config)# boot system tftp test.exe 172.16.13.111 [Ctrl-Z] Router#copy running-config startup-config ROM Router#configure terminal Router(config)# boot system rom [Ctrl-Z] Router#copy running-config startup-config](https://image.slidesharecdn.com/lecture20presentation-100917010007-phpapp02/85/Lecture-20-presentation-16-320.jpg)
Lecture 20 presentation
- 1. Managing the Configuration Environment Copyright © 1998 Cisco Systems, Inc. ICRC_revision_11.3
- 2. Locating the Cisco IOS Software Configuration Registers Registers in NVRAM for modifying fundamental Cisco IOS software Identifies where to boot Cisco IOS image (for example, use config-mode commands)
- 3. Locating the Cisco IOS Software Configuration Registers Registers in NVRAM for modifying fundamental Cisco IOS software Identifies where to boot Cisco IOS image (for example, use config-mode commands) Router# configure terminal Router(config)# boot system flash IOS_filename Router(config)# boot system tftp IOS_filename tftp_address Router(config)# boot system rom [Ctrl-Z] Router# copy running-config startup-config
- 4. Locating the Cisco IOS Software Configuration Registers Registers in NVRAM for modifying fundamental Cisco IOS software Identifies where to boot Cisco IOS image (for example, use config-mode commands) Router# configure terminal Router(config)# boot system flash IOS_filename Router(config)# boot system tftp IOS_filename tftp_address Router(config)# boot system rom [Ctrl-Z] Router# copy running-config startup-config Boot system commands not found In NVRAM
- 5. Locating the Cisco IOS Software Configuration Registers Registers in NVRAM for modifying fundamental Cisco IOS software Identifies where to boot Cisco IOS image (for example, use config-mode commands) Router# configure terminal Router(config)# boot system flash IOS_filename Router(config)# boot system tftp IOS_filename tftp_address Router(config)# boot system rom [Ctrl-Z] Router# copy running-config startup-config Boot system commands not found In NVRAM Get default Cisco IOS software from Flash
- 6. Locating the Cisco IOS Software Configuration Registers Registers in NVRAM for modifying fundamental Cisco IOS software Identifies where to boot Cisco IOS image (for example, use config-mode commands) Router# configure terminal Router(config)# boot system flash IOS_filename Router(config)# boot system tftp IOS_filename tftp_address Router(config)# boot system rom [Ctrl-Z] Router# copy running-config startup-config Boot system commands not found In NVRAM Get default Cisco IOS software from Flash Flash memory empty
- 7. Locating the Cisco IOS Software Configuration Registers Registers in NVRAM for modifying fundamental Cisco IOS software Identifies where to boot Cisco IOS image (for example, use config-mode commands) Router# configure terminal Router(config)# boot system flash IOS_filename Router(config)# boot system tftp IOS_filename tftp_address Router(config)# boot system rom [Ctrl-Z] Router# copy running-config startup-config Boot system commands not found In NVRAM Get default Cisco IOS software from Flash Flash memory empty Get default Cisco IOS software from TFTP server
- 8. Locating the Cisco IOS Software ROM monitor Configuration Registers Registers in NVRAM for modifying fundamental Cisco IOS software Identifies where to boot Cisco IOS image (for example, use config-mode commands) Router# configure terminal Router(config)# boot system flash IOS_filename Router(config)# boot system tftp IOS_filename tftp_address Router(config)# boot system rom [Ctrl-Z] Router# copy running-config startup-config Boot system commands not found In NVRAM Get default Cisco IOS software from Flash Flash memory empty Get default Cisco IOS software from TFTP server
- 9. Determining the Current Configuration Register Value Router# show version IOS (tm) 2500 Software (C2500-JS-L), Version 11.2 (6), RELEASE SOFTWARE (fc1) Copyright (c) 1986-1997 by cisco Systems, Inc. Compiled Tue 06-May-97 16:17 by kuong Image text-base: 0x0303ED8C, data-base: 0x00001000 ROM: System Bootstrap, Version 5.2(8a), RELEASE SOFTWARE ROM: 3000 Bootstrap Software (IGS-RXBOOT), version 10.2 (8a), RELEASE SOFTWARE (fc1) Router uptime is 21 hours, 13 minutes System restarted by reload System image file is "flash:c2500-js-l.112-6.bin", booted via flash Configuration register is 0x2102 . . .
- 10. Configuration Register bits 3, 2, 1, and 0 set boot option Configuration Register Values Router#configure terminal Router(config)# config-register 0x2102 [Ctrl-Z] Router#reload
- 11. Configuration Register bits 3, 2, 1, and 0 set boot option Configuration Register Values Configuration-Register Value 0x0 Meaning Use ROM monitor mode (Manually boot using the b command) Router#configure terminal Router(config)# config-register 0x2102 [Ctrl-Z] Router#reload
- 12. Configuration Register bits 3, 2, 1, and 0 set boot option Configuration Register Values Configuration-Register Value 0x0 0x1 Meaning Use ROM monitor mode (Manually boot using the b command) Automatically boot from ROM (Provides IOS subset) Router#configure terminal Router(config)# config-register 0x2102 [Ctrl-Z] Router#reload
- 13. Configuration Register bits 3, 2, 1, and 0 set boot option Check Configuration Register setting with show version Configuration Register Values Configuration-Register Value 0x0 0x2 to 0xF 0x1 Meaning Use ROM monitor mode (Manually boot using the b command) Examine NVRAM for boot system commands (0x2 default if router has Flash) Automatically boot from ROM (Provides IOS subset) Router#configure terminal Router(config)# config-register 0x2102 [Ctrl-Z] Router#reload
- 14. Boot System Options in Software Router#configure terminal Router(config)# boot system flash c2500-js-l [Ctrl-Z] Router#copy running-config startup-config Flash
- 15. Boot System Options in Software Router#configure terminal Router(config)# boot system flash c2500-js-l [Ctrl-Z] Router#copy running-config startup-config Flash Network Router#configure terminal Router(config)# boot system tftp test.exe 172.16.13.111 [Ctrl-Z] Router#copy running-config startup-config
- 16. Boot System Options in Software Router#configure terminal Router(config)# boot system flash c2500-js-l [Ctrl-Z] Router#copy running-config startup-config Flash Network Router#configure terminal Router(config)# boot system tftp test.exe 172.16.13.111 [Ctrl-Z] Router#copy running-config startup-config ROM Router#configure terminal Router(config)# boot system rom [Ctrl-Z] Router#copy running-config startup-config