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Posted by Vaughan Butler on November 1, 2007, 4:35 pm
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>I have a cisco 2501 Router that i used this past year as part of my ccna
> study curriculum. I have not used the router in 6 months or so. I have
> graduated school and now i am persuing my ccna certification. I fired up
> the routers for the first time in forever ( i also have 2, 2524 models no
> problems with either) upon examining the 2501 i noticed that it now boots
> to boot mode ie: Router(Boot)# I checked the ios and it says the checksum
> is invalid, so I decided to upload a backup of the ios from my pc via tftp
> server. The router has 3 interfaces 2 serial and 1 aui, since i do not
> have
> an aui transciever I always set up a serial connection from my 2501 to my
> 2524(which has an ethernet interface) and copy or upload the ios from my
> pc
> to the 2524 and on to the 2501. I would like to have done it this way
> however I could not get a connection accross the 2 routers. The 2501 would
> let me get to the interface, set the ip, no shut, and the clockrate,
> however i could not enable rip (it says invalid command), i have used the
> ?
> command and the router (protocol) command is not listed anywhere. So I
> decided to send the new flash via xmodem from rommon mode to the router. I
> entered config-register 0x2100 and reloaded only to find that I am now in
> what seems to be an even less functional version of rommon mode. When i
> reboot the router I recieve the following info:
>
> System Bootstrap, Version 11.0(10c), SOFTWARE
> Copyright (c) 1986-1996 by cisco Systems
> 2500 processor with 6144 Kbytes of main memory
>>
>
>
> Upon typing ? at the prompt I recieve the following options:
> $
> B [filename]
> C [address]
> D /S M L V
> E /S M L
> G [address]
> H
> I
> K
> L [filename]
>
> O
> P
> S
> T function
> Deposit and Examine sizes may be B (byte), L (long) or S (short).
> Modifiers may be R (register) or S (byte swap).
> Register names are: D0-D7, A0-A^, SS, US, SR, and PC
>
> when i try to reload the router I recieve the message:
> What?
>
> Ive tried to change the configuration Register to 0x2102 and the command
> seems to work but there is no way (I cant find it) to reboot the router
> except to turn off the power.However when i power back up im back to the
> same screen =(
>
> My questions are
> 1. How can I get back to regular ROMMON mode?
> 2. Once in Rommon or boot mode is there anyway to bring up a serial
> connection to another router ( since the protocols seem to be disabled)
> 3. Can I upload the flash image while in this mode and if so how
>
> Thank you in advance for your help, and if you require any other info
> please feel free to ask. Thanks again
If you are in ROMmon mode (prompt = >)
Type o to display the contents of the config register
Type o/r 0x2102 to set the router to start with any configuration in NVRAM
(or 0x2142 to ignore anything in NVRAM)
Type i to reload the router
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