cisco 857 password recovery|
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Posted by GT on June 30, 2009, 1:45 pm
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update. the system has been previously configured with the 'no service password-recovery', the IOS image has been removed from flash, prior to upgrade. However we are now unable to enter 'rommon' mode to download new ios image in the normal manner. i have found technotes on this, that seem to indicate that even with this enabled, we can do ctrl-break when it loads the IOS image to enter rommon. however we do not get to this point on account of no ios image, such that the router continually recycles. the capability of the 'reset' button seems also to have been disabled (i can't be sure whether this is on account of the password-recovery configuration). would be v.glad of the workaround to this - seem this would relate to a reset somehow of the config-register to its factory default. Thanks | ||||||||||||||||||||||||||||||||||
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Posted by bod43 on June 30, 2009, 2:37 pm
Please log in for more thread options Well according to this document - http://www.cisco.com/en/US/products/hw/routers/ps274/products_configuration= _example09186a00801d8113.shtml the router is dead. no service password-recovery disables access to the rommon prompt. No recovery requiring rommon can be accomplished. You will need a second router in which to temporarily install the flash module. I would imagine that any 850 series router will suffice. | ||||||||||||||||||||||||||||||||||
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Posted by Graham Turner on June 30, 2009, 2:49 pm
Please log in for more thread options >
> > > > > > this is a post re. the recovery of an 857 router during an IOS
> > update. >
> > the system has been previously configured with the 'no service
> > password-recovery', >
> > the IOS image has been removed from flash, prior to upgrade. However
> > we are now unable to enter 'rommon' mode to download new ios image in > > the normal manner. >
> > i have found technotes on this, that seem to indicate that even with
> > this enabled, we can do ctrl-break when it loads the IOS image to > > enter rommon. >
> > however we do not get to this point on account of no ios image, such
> > that the router continually recycles. >
> > the capability of the 'reset' button seems also to have been disabled
> > (i can't be sure whether this is on account of the password-recovery > > configuration). >
> > would be v.glad of the workaround to this =A0- seem this would relate t=
o
> > a reset somehow of the config-register to its factory default. Thanks
>
> Well according to this document - > > http://www.cisco.com/en/US/products/hw/routers/ps274/products_configu... > > the router is dead. > > no service password-recovery disables access to > the rommon prompt. No recovery requiring rommon > can be accomplished. > > You will need a second router in which to temporarily install > the flash module. I would imagine that any 850 series router > will suffice.- Hide quoted text - > > - Show quoted text - Thanks for note back. re flash memory - how does that work ? is the onboard flash removable, or do you suggest to add additonal flash memory, somehow causing the router to reset ? | ||||||||||||||||||||||||||||||||||
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Posted by bod43 on June 30, 2009, 3:12 pm
Please log in for more thread options >
> > > > > > this is a post re. the recovery of an 857 router during an IOS
> > > update. >
> > > the system has been previously configured with the 'no service
> > > password-recovery', >
> > > the IOS image has been removed from flash, prior to upgrade. However
> > > we are now unable to enter 'rommon' mode to download new ios image in > > > the normal manner. >
> > > i have found technotes on this, that seem to indicate that even with
> > > this enabled, we can do ctrl-break when it loads the IOS image to > > > enter rommon. >
> > > however we do not get to this point on account of no ios image, such
> > > that the router continually recycles. >
> > > the capability of the 'reset' button seems also to have been disabled
> > > (i can't be sure whether this is on account of the password-recovery > > > configuration). >
> > > would be v.glad of the workaround to this =A0- seem this would relate=
to
> > > a reset somehow of the config-register to its factory default. Thanks
>
> > Well according to this document -
>
> >http://www.cisco.com/en/US/products/hw/routers/ps274/products_configu...
>
> > the router is dead.
>
> > no service password-recovery disables access to
> > the rommon prompt. No recovery requiring rommon > > can be accomplished. >
> > You will need a second router in which to temporarily install
> > the flash module. I would imagine that any 850 series router > > will suffice.- Hide quoted text - >
> > - Show quoted text -
>
> Thanks for note back. > > re flash memory - how does that work ? is the onboard flash removable, > or do you suggest to add additonal flash memory, somehow causing the > router to reset ? No, you need a second working router and you will have to remove the flash from it and put the flash from the broken router into the good one and put an IOS image on the 'broken' flash. The onboard flash is a memory stick. I forget the exact technology. SIMM, DIMM thingy. There will probably be two, RAM and FLASH. If you have ever removed a memory stick from a PC you will have no trouble. The FLASH chip contains the software image and maybe other files. You can recover an image on to the flash by putting it in another router and downloading an image. Once you get an image in the router you can then follow the instructions on the page previousy pointed at. Try this one first - "Another method is to reload or boot the router with console access" | ||||||||||||||||||||||||||||||||||
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Posted by Graham Turner on June 30, 2009, 3:38 pm
Please log in for more thread options >
> > > > > > > > > > this is a post re. the recovery of an 857 router during an IOS
> > > > update. >
> > > > the system has been previously configured with the 'no service
> > > > password-recovery', >
> > > > the IOS image has been removed from flash, prior to upgrade. Howeve=
r
> > > > we are now unable to enter 'rommon' mode to download new ios image =
in
> > > > the normal manner.
>
> > > > i have found technotes on this, that seem to indicate that even wit=
h
> > > > this enabled, we can do ctrl-break when it loads the IOS image to
> > > > enter rommon. >
> > > > however we do not get to this point on account of no ios image, suc=
h
> > > > that the router continually recycles.
>
> > > > the capability of the 'reset' button seems also to have been disabl=
ed
> > > > (i can't be sure whether this is on account of the password-recover=
y
> > > > configuration).
>
> > > > would be v.glad of the workaround to this =A0- seem this would rela=
te to
> > > > a reset somehow of the config-register to its factory default. Than=
ks
>
> > > Well according to this document -
>
> > >http://www.cisco.com/en/US/products/hw/routers/ps274/products_configu.=
..
>
> > > the router is dead.
>
> > > no service password-recovery disables access to
> > > the rommon prompt. No recovery requiring rommon > > > can be accomplished. >
> > > You will need a second router in which to temporarily install
> > > the flash module. I would imagine that any 850 series router > > > will suffice.- Hide quoted text - >
> > > - Show quoted text -
>
> > Thanks for note back.
>
> > re flash memory - how does that work ? is the onboard flash removable,
> > or do you suggest to add additonal flash memory, somehow causing the > > router to reset ? >
> No, you need a second working router and you will have to > remove the flash from it and put the flash from the broken > router into the good one and put an IOS image on the > 'broken' flash. > > The onboard flash is a memory stick. I forget the > exact technology. SIMM, DIMM thingy. There will > probably be two, RAM and FLASH. If you have ever > removed a memory stick from a PC you will have no trouble. > > The FLASH chip contains the software image and maybe > other files. You can recover an image on to the flash > by putting it in another router and downloading an image. > > Once you get an image in the router you can then follow > the instructions on the page previousy pointed at. > > Try this one first - > "Another method is to reload or boot the router with > console access"- Hide quoted text - > > - Show quoted text - Thanks further note back. not sure if i am being daft, but does not appear to be any removable mem modules on the 857 we have. there are 3 empty 'slots' - one DIMM like, and two slots of the types that i have installed vpn modules in - dont know if that makes sense ? Although we have been remiss in removing the flash contents with the 'service password recovery disabled' i can't believe that there is not some hardware reset, presumably if we could get back to the default config-register that does not have the bit set that disables 'break' ? | ||||||||||||||||||||||||||||||||||
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> update.
>
> the system has been previously configured with the 'no service
> password-recovery',
>
> the IOS image has been removed from flash, prior to upgrade. However
> we are now unable to enter 'rommon' mode to download new ios image in
> the normal manner.
>
> i have found technotes on this, that seem to indicate that even with
> this enabled, we can do ctrl-break when it loads the IOS image to
> enter rommon.
>
> however we do not get to this point on account of no ios image, such
> that the router continually recycles.
>
> the capability of the 'reset' button seems also to have been disabled
> (i can't be sure whether this is on account of the password-recovery
> configuration).
>
> would be v.glad of the workaround to this =A0- seem this would relate to
> a reset somehow of the config-register to its factory default. Thanks