Recover IOS from Rommon

DeliriousDelirious Member Posts: 79 ■■□□□□□□□□
in CCNA & CCENT
Ok so i made the mistake of completely wiping my flash....or maybe i just did it cause subconsciously wanted to practice icon_rolleyes.gif

Connected via console and i have the router (831) connect via one of the lan ports to the tftp server, not sure if this is the way to do it.

Anyway here is the output i get and the error that follows after i type "tftpdnld":


System Bootstrap, Version 12.2(8r)YN, RELEASE SOFTWARE (fc1)
TAC Support: http://www.cisco.com/tac
Copyright (c) 2002 by cisco Systems, Inc.
C800/SOHO series (Board ID: 29-129) platform with 49152 Kbytes of main memory

boot: cannot determine first file name on device "flash:"

System Bootstrap, Version 12.2(8r)YN, RELEASE SOFTWARE (fc1)
TAC Support: http://www.cisco.com/tac
Copyright (c) 2002 by cisco Systems, Inc.
C800/SOHO series (Board ID: 29-129) platform with 49152 Kbytes of main memory

rommon 1 > set
PS1=rommon ! >
BSI=0
RET_2_RUTC=0
RET_2_RTS=
SUBNET_MASK=255.255.255.0
DEFAULT_GATEWAY=10.10.10.1
TFTP_SERVER=10.10.10.5
TFTP_FILE=c831-k9o3sy6-mz.123-11.YZ1
IP_ADDRESS=10.10.10.2
0=4
TFTP_VERBOSE=1
?=1
rommon 2 > tftpdnld

IP_ADDRESS: 10.10.10.2
Missing or illegal ip address for variable IP_SUBNET_MASK
Illegal subnet mask.


Looked through some of the threads here and the cisco documentation but im beating my head against a wall at this point.
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Comments

  • DeliriousDelirious Member Posts: 79 ■■□□□□□□□□
    Never mind i figured it out. icon_rolleyes.gif

    Subnet mask needs to be set with IP_SUBNET_MASK and not SUBNET_MASK. Not sure why it would accept the subnet_mask command if thats not correct.
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  • malcyboodmalcybood Member Posts: 900 ■■■□□□□□□□
    Hey,

    Not sure if you know this or not but you can also do this by using a feature called xmodem via console cable.

    Check out the section at this link Installing the Router Software by Using the Console

    http://www.cisco.com/en/US/products/sw/iosswrel/ps1830/prod_release_note09186a0080081174.html

    Malc
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  • DeliriousDelirious Member Posts: 79 ■■□□□□□□□□
    malcybood wrote:
    Hey,

    Not sure if you know this or not but you can also do this by using a feature called xmodem via console cable.

    Check out the section at this link Installing the Router Software by Using the Console

    http://www.cisco.com/en/US/products/sw/iosswrel/ps1830/prod_release_note09186a0080081174.html

    Malc

    Thanks malcybood, I have read of the painful ways of xmodem on here. :D


    I'm able to get the image to the router now but when i reset it i get the message "cannot determine first filename on device."

    Then it goes into rommon mode after a couple tries.

    I checked the flash useing the dir command and the image is on there but its giving me a "bad checksum error."

    So i went back and added the "TFTP_CHECKSUM=0" command and im still getting the same thing.

    Any ideas?
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  • DeliriousDelirious Member Posts: 79 ■■□□□□□□□□
    Well the message says

    "cannot determine first filename on device flash:"

    When i get into rommon i can do a >dir flash: and it shows the ios file on the flash. So i dont know why it cant read the filename.

    I'm at work now so ill have to mess with it more when i get home.
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  • malcyboodmalcybood Member Posts: 900 ■■■□□□□□□□
    can you copy and paste the whole output?
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  • markzabmarkzab Member Posts: 619
    Welcome to my world...

    http://techexams.net/forums/viewtopic.php?t=23248

    Have fun. Just leave a tip for Darby on your way out. icon_wink.gif
    "You, me, or nobody is gonna hit as hard as life. But it ain't how hard you hit; it's about how hard you can get hit, and keep moving forward. How much you can take, and keep moving forward. That's how winning is done!" - Rocky
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  • DeliriousDelirious Member Posts: 79 ■■□□□□□□□□
    I'll put up the whole output when i get home from work.

    markzab wrote:
    Welcome to my world...

    http://techexams.net/forums/viewtopic.php?t=23248

    Have fun. Just leave a tip for Darby on your way out. icon_wink.gif

    wow! I hope the 2924 and the 2950 i got off ebay dont have problems like that. Im in the right place for help though, and im sure it would be a good learning experience.
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  • markzabmarkzab Member Posts: 619
    Delirious wrote:
    I'll put up the whole output when i get home from work.

    markzab wrote:
    Welcome to my world...

    http://techexams.net/forums/viewtopic.php?t=23248

    Have fun. Just leave a tip for Darby on your way out. icon_wink.gif

    wow! I hope the 2924 and the 2950 i got off ebay dont have problems like that. Im in the right place for help though, and im sure it would be a good learning experience.

    I learned a hel of a lot going through those 5-7 hours in that thread. It was my first and 2nd time using xmodem all in one night. I posted it just in case you have to do the same thing to your machine. Have fun. :)
    "You, me, or nobody is gonna hit as hard as life. But it ain't how hard you hit; it's about how hard you can get hit, and keep moving forward. How much you can take, and keep moving forward. That's how winning is done!" - Rocky
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  • DeliriousDelirious Member Posts: 79 ■■□□□□□□□□
    Ok, heres what i get when it boots up after using tftp
    System Bootstrap, Version 12.2(8r)YN, RELEASE SOFTWARE (fc1)
    TAC Support: http://www.cisco.com/tac
    Copyright (c) 2002 by cisco Systems, Inc.
    C800/SOHO series (Board ID: 29-129) platform with 49152 Kbytes of main memory

    boot: cannot determine first file name on device "flash:"
    System Bootstrap, Version 12.2(8r)YN, RELEASE SOFTWARE (fc1)
    TAC Support: http://www.cisco.com/tac
    Copyright (c) 2002 by cisco Systems, Inc.
    C800/SOHO series (Board ID: 29-129) platform with 49152 Kbytes of main memory

    boot: cannot determine first file name on device "flash:"

    System Bootstrap, Version 12.2(8r)YN, RELEASE SOFTWARE (fc1)
    TAC Support: http://www.cisco.com/tac
    Copyright (c) 2002 by cisco Systems, Inc.
    C800/SOHO series (Board ID: 29-129) platform with 49152 Kbytes of main memory

    rommon 1 >

    And heres what i get when i check the flash
    rommon 1 > dir flash:
    File size Checksum File name
    8646068 bytes (0x83edb4) 0x6f35 c831-k9o3sy6-mz.123-11.YZ1.bin (bad chec
    ksum: 0x9e60)
    rommon 2 >
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  • iprouteiproute Member Posts: 269
    Delirious wrote:
    Ok, heres what i get when it boots up after using tftp
    System Bootstrap, Version 12.2(8r)YN, RELEASE SOFTWARE (fc1)
    TAC Support: http://www.cisco.com/tac
    Copyright (c) 2002 by cisco Systems, Inc.
    C800/SOHO series (Board ID: 29-129) platform with 49152 Kbytes of main memory

    boot: cannot determine first file name on device "flash:"
    System Bootstrap, Version 12.2(8r)YN, RELEASE SOFTWARE (fc1)
    TAC Support: http://www.cisco.com/tac
    Copyright (c) 2002 by cisco Systems, Inc.
    C800/SOHO series (Board ID: 29-129) platform with 49152 Kbytes of main memory

    boot: cannot determine first file name on device "flash:"

    System Bootstrap, Version 12.2(8r)YN, RELEASE SOFTWARE (fc1)
    TAC Support: http://www.cisco.com/tac
    Copyright (c) 2002 by cisco Systems, Inc.
    C800/SOHO series (Board ID: 29-129) platform with 49152 Kbytes of main memory

    rommon 1 >

    And heres what i get when i check the flash
    rommon 1 > dir flash:
    File size Checksum File name
    8646068 bytes (0x83edb4) 0x6f35 c831-k9o3sy6-mz.123-11.YZ1.bin (bad chec
    ksum: 0x9e60)
    rommon 2 >

    Have you tried:
    - Erase the flash and re-copy the IOS
    - Try a different IOS
    - At the rommon prompt: boot flash:ios_file_name
    CCNP Progress
    ROUTE [X] :: SWITCH [X] :: TSHOOT [X]
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  • DeliriousDelirious Member Posts: 79 ■■□□□□□□□□
    DarbyWeaver wrote:
    Seems like you may need to run the command:

    squeeze flash:

    on the 831 but I forget - I've been doing 871's lately as VPN Routers.

    Seems like i remember reading that some where too, i just assumed that since the ios was small enough fit on the flash i wouldn't need to. Assumption seems to be the mother of evil for me icon_rolleyes.gif

    I'll give that shot though.
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  • DeliriousDelirious Member Posts: 79 ■■□□□□□□□□
    Ok shes up and running now.

    I had to load the new image into ram, go in and erase the flash again, and then run squeeze. From there i was able to copy the image over to flash. :D

    Thanks for the help everyone!
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