From: fwells12 (fwells12@xxxxxxxxxxx)
Date: Mon Jan 08 2001 - 05:39:38 GMT-3
In your case the config register was set to boot from ROM if the flash could
not boot from the network (tftp server) The router was also set to go
directly into Rommon without a power cycle (press the break key). Lastly,
the console baud rate should have been 1200 not 2400 like you mentioned.
----- Original Message -----
From: Chuck Larrieu <chuck@cl.cncdsl.com>
To: Cisco Mail List <cisco@groupstudy.com>; CCIE_Lab Groupstudy List
<ccielab@groupstudy.com>
Sent: Sunday, January 07, 2001 10:57 PM
Subject: Troubleshooting 102 - "password recovery"
> Well that wasn't nearly so bad as it could have been. The low life who
> trashed my router, not to mention spoiled it for a lot of folks on these
> lists, could have been more malicious. But he was deliberate. No doubt
about
> it.
>
> So here is today's troubleshooting lesson - not really password recovery,
> but configuration register setting recovery. I have done a bit of password
> recovery practice, but not much.
>
> 1) cannot get into rommon mode. Not that I can tell. Gibberish of various
> sorts on screen. Check to be sure my version of HyperTerminal sends the
> correct control-break sequence, using another router. it does. I was sure
I
> had upgraded this particular version, but these days, when moving between
so
> many different computers at home and on the job, one never can tell.
>
> 2) Ok, with gibberish on the screen, what are some things to check? A
quick
> look through CCO confirms that baud rate is the only terminal setting that
> can be changed in the register. Thank goodness one cannot also change the
> data, stop, and parity.
>
> 3) OK. Brute force this thing. 9600 does not work. Let's work down the
> scale, and see..... 4800 does not work. 1200 did not work earlier this
> afternoon. But 2400 does work. I see clear text and I see I am in rommon
> after all.
>
> 4) Check the current config register setting. E/s 2000002 [enter] reveals
> the setting as 0x3942 you bad boy!
>
> 5) Use the o/r 0x2102 to reset the register and reload.
>
> 6) Rommon again! Hhmmm.........
>
> 7) OK, this time do a config mem ( I probably should have looked at this
> last time anyway, but I did not )
>
> 8) Well, what did the yo-yo do here? Hostname rommon> interesting.
> Certainly explains the console message I was seeing last time I reloaded.
> Well, I don't have time to fool around any more. Erase start, reload,
things
> come up ok. I will copy my saved configuration later.
>
> 9) Too bad garbage-head inserted himself into this weekend. Someone was
> doing a very interesting IPSec tunnel between my pod and theirs. I was
> looking forward to seeing the result.
>
> 10) End result - learned a few more things which will be valuable in the
> lab - troubleshooting portion.
>
> Extra credit - with a configuration register setting of 0x3942, what was
> happening at boot time?
>
> Chuck
> ----------------------
> I am Locutus, a CCIE Lab Proctor. Xx_Brain_dumps_xX are futile. Your life
as
> it has been is over ( if you hope to pass ) From this time forward, you
will
> study US!
> ( apologies to the folks at Star Trek TNG )
>
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