qr code c# sample Changing the Configuration Register from ROM Monitor in Objective-C

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Changing the Configuration Register from ROM Monitor
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Of course, one problem with the Configuration mode method of changing the register value is that you must gain access to Privilege EXEC mode first This can be a problem if you don t know the passwords on the router A second method, though, allows you to change the register value without having to log into the router To use this method, you ll need console access to the router you can t do this from the auxiliary line or from a VTY session Next, you ll turn off the router and then turn it back on As the router starts booting, you ll break into ROMMON mode with the router s break sequence To break into the router, once you see the bootstrap program has loaded, you can, in most cases, use the CTRL-BREAK control sequence to break into ROMMON mode Note that this control sequence may differ, depending on the terminal emulation program you are using on your PC Once in ROMMON mode, you can begin the process of changing the register value using one of two methods, depending on the router model that you have Some of Cisco s routers, such as the 1800 and 2600-1, use the confreg command This script asks you basic questions about the function and bootup process of the router What s nice about the script is that you don t need to know the hexadecimal
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values for the configuration register, since the router will create them for you as you answer these questions Here is an example of using this script:
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rommon 5 > confreg Configuration Summary enabled are: load rom after netboot fails console baud: 9600 boot: image specified by the boot system commands or default to: cisco2-C3600 do you wish to change the configuration y/n [n]: enable "diagnostic mode" y/n [n]: enable "use net in IP bcast address" y/n [n]: disable "load rom after netboot fails" y/n [n]: enable "use all zero broadcast" y/n [n]: enable "break/abort has effect" y/n [n]: enable "ignore system config info" y/n [n]: change console baud rate y/n [n]: change the boot characteristics y/n [n]: Configuration Summary enabled are: load rom after netboot fails console baud: 9600 boot: image specified by the boot system commands or default to: cisco2-C3600 do you wish to change the configuration y/n [n]: rommon 6 > y
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1604 The CD contains a multimedia demonstration of changing the configuration register in ROMMON mode (confreg) and using the IOS CLI config-register command on a router Just as in the System Configuration Dialog, any information in brackets ([]) represents default values The first question that it asks is if you want to change the configuration, which means change the register: answer y to continue If you answer y to ignore system config info, the third hexadecimal digit becomes 4, making a router s register value appear as 0x2142 This option is used when you want to perform the password recovery procedure The next-to-last question is change the boot characteristics this question, if you answer y, will repeat the questions again Answer n to exit the script If you make any changes, you are asked
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16: Initial Router Con guration
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to save them (do you wish to change the configuration ) answer y to save your new register value Once you are done changing the register, reboot the router On many routers, just type in the letter i or b in ROMMON mode to boot it up As a shortcut, you could also execute the following command from ROMMON mode: confreg 0x2142
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When performing the password recovery procedure, break into ROMMON mode and change the con guration register value to 0x2142 and boot up the router Once booted up, the router will ignore the con guration in NVRAM and take you into the System Con guration Dialog Using CTRL-C will break you out of this utility and take you to User EXEC mode Enter Privilege EXEC
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mode and restore your con guration with the copy startup-con g runningcon g commandThe no shutdown command is not listed in the router s NVRAM con guration, so you will have to enable the interfaces manuallyThis is also true if you copy and paste a con guration into a router with its interfaces disabled, such as a newly booted router
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