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Community Member

Difference between bootstrap program (register 2101) and ROMMON (register 2120)

Hi,

Is there anybody that could indicate me the difference between the bootstrap (RXboot) program (0x2101) and ROMMON (0x2120). My understanding of ROMMON is that this can be used on 2600 series router to change the register settings, look for a valid image in flash, download using TFTP, XMODEM but bootsrap functionality is unclear to me.

Litterature seems to confused bootstrap and ROMMON.

Does ROMMON and bootstrap has the same functionality and both coexist  on a router series like the 2600 or does bootstrap is only supported on older series of router.

Does ROMMON supported on newer series of router like the 2800 and the 3800.

Thanks

Stephane

2 ACCEPTED SOLUTIONS

Accepted Solutions
Cisco Employee

Re: Difference between bootstrap program (register 2101) and ROM

Hello,

Bootstrap is more like BIOS. It will initialize the basic device drivers and

then will execute the IOS image. So, ideally, when the device is working in

good condition, the bootstrap will initialize the flash disk and then copy

the IOS into the RAM, and initialize IOS execution. If, for some reason, IOS

execution fails, then it will copy the ROM Monitor software into the RAM and

then execute that. ROM Monitor software (ROMMON) is a recovery console

through which you can recover the device from software failures.

Hope this helps.

Regards,

NT

Community Member

Re: Difference between bootstrap program (register 2101) and ROM

Hi,

     Answer to your question "difference between the bootstrap (RXboot) program (0x2101) and ROMMON (0x2120)."

Plz visit link : http://www.cisco.com/en/US/products/hw/routers/ps133/products_tech_note09186a008022493f.shtml

Same time visit : http://www.cisco.com/en/US/products/hw/routers/ps270/products_installation_guide_chapter09186a00802ecd10.html

"Does ROMMON supported on newer series of rotuter like the 2800 and the 3800." --- Yes, For more details visit: http://www.cisco.com/en/US/docs/routers/access/1800/1841/software/configuration/guide/b_rommon.html

This document is for 2800 and 3800 Rommon troubleshooting...

Uttam

http://www.startnetworks.blogspot.com/

2 REPLIES
Cisco Employee

Re: Difference between bootstrap program (register 2101) and ROM

Hello,

Bootstrap is more like BIOS. It will initialize the basic device drivers and

then will execute the IOS image. So, ideally, when the device is working in

good condition, the bootstrap will initialize the flash disk and then copy

the IOS into the RAM, and initialize IOS execution. If, for some reason, IOS

execution fails, then it will copy the ROM Monitor software into the RAM and

then execute that. ROM Monitor software (ROMMON) is a recovery console

through which you can recover the device from software failures.

Hope this helps.

Regards,

NT

Community Member

Re: Difference between bootstrap program (register 2101) and ROM

Hi,

     Answer to your question "difference between the bootstrap (RXboot) program (0x2101) and ROMMON (0x2120)."

Plz visit link : http://www.cisco.com/en/US/products/hw/routers/ps133/products_tech_note09186a008022493f.shtml

Same time visit : http://www.cisco.com/en/US/products/hw/routers/ps270/products_installation_guide_chapter09186a00802ecd10.html

"Does ROMMON supported on newer series of rotuter like the 2800 and the 3800." --- Yes, For more details visit: http://www.cisco.com/en/US/docs/routers/access/1800/1841/software/configuration/guide/b_rommon.html

This document is for 2800 and 3800 Rommon troubleshooting...

Uttam

http://www.startnetworks.blogspot.com/

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