05-20-2011 11:54 PM - edited 03-11-2019 01:36 PM
Dear Team,
I have multiple os stored in my flash, as my upgraded os is crashed I want fall back to old os stored in flash, Is this possiblie to change the boot system from rommon. if possible what are the steps
Thanks
Manu B.
Solved! Go to Solution.
05-21-2011 03:40 AM
Hi Manu,
You cannot change the boot parameters but you can definitely upload a new image from tftp in rommon mode.
here I am attaching the document for you.
thanks,
Varun
05-21-2011 12:20 AM
Hi Manu,
Here is s adoc for it, you can use it to booot image from rommon:
By the way is the device not booting up, if it is booting up then u can use the following commands to change the boot parameters:
boot system flash:/
wr mem
reload
this would boot the ASA with the OS that yuo want.
Hope this helps.
Thanks,
Varun
05-21-2011 03:35 AM
unfortubately the link is forbidden..
Device is not booting up, can I edit the boot system in rommon?
05-21-2011 03:40 AM
06-18-2015 04:44 PM
Thats not correct. You can choose which image to boot from rommon. You just have to look a little bit.
If the configuration register value is set to make the system boot automatically from a default Cisco IOS software image, and if no break signal is sent during start up, the router should boot normally. However, if the router still enters the rommon mode, it is most likely because the router is unable to locate a valid Cisco IOS software image.
In this case, the first thing you need to do is look for a valid Cisco IOS software image in each available device. Issue the devcommand to see which devices are available on your router:
rommon 1 > dev Devices in device table: id name bootflash: boot flash slot0: PCMCIA slot 0 slot1: PCMCIA slot 1 eprom: EPROM rommon 2 >
Next, issue the dir [device ID] command for each of the available devices, and look for a valid Cisco IOS software image (the device ID is slot0: and/or slot1:, corresponding to the PCMCIA cards inserted in the respective slots):
rommon 2 > dir slot0: File size Checksum File name 12566060 bytes (0xbfbe2c) 0x38d1c81b c7200-ik8s-mz.122-10b.bin rommon 3 >
Note that if the router returns a "bad device name" message, the device specified probably does not exist.
The output of the dir slot0: command above indicates that a valid image is indeed present in the Flash. Try to boot from that image by using the boot command.
rommon 3> boot slot0:c7200-ik8s-mz.122-10b.bin CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC CCCCCCCCCCCCCCCCCC
http://www.cisco.com/c/en/us/support/docs/routers/7500-series-routers/15082-recovery-c7500.html#look_for_valid
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide