3600 boots always in rommon mode

Jul 07, 2006 8 Replies
C

Hello folks!



I upgrade my 3600 image (to 12.3(17b)) and now the router enters always in rommon mode after a reload command or power off-on.



I've got 2 solutions to boots up ok:


1) If I write "rommon> boot (+ Enter)" using Hyperterminal the router starts up OK, but 'show version' shows 'configuration register 0x0' (doesn't keep the register value I order it before reload)


2) Other solution to boots the image: rommon1>confreg boot: rom monitor console speed: 9600 . . rommon1> confreg 0x2102 rommon1> reset



And the router boots up OK. Now I write the next:



router# show ver . . Configuration register is 0x2102



router# sh runn | include boot boot-start-marker boot system flash c3620-is-mz.123-17b.bin boot-end-marker



router# dir flash: 1 -rw- 15789184 3620-is-mz.123-17b.bin



line con 0 is set up at speed 9600


But if I reload , the router enters int rommon mode again.



Any ideas? Do I have to setup anything else in rommon? Any misconfiguration?



Thanks, Charles.



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M

The names do NOT match:

boot system flash c3620-is-mz.123-17b.bin

1 -rw- 15789184 3620-is-mz.123-17b.bin

The filename in flash does not start with "c"

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C

thanks Merv, sorry, but it was a problem with 'cut&paste':

router#dir flash: Directory of flash:/

1 -rw- 15789184 c3620-is-mz.123-17b.bin

boot-start-marker boot system flash c3620-is-mz.123-17b.bin boot-end-marker

the names MATCH perfectly. Any ideas?

Thanks.

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A

Just a shot in the dark.

Try changing the confreg from IOS when you get it IOS up.

adsl#sh ver ... Configuration register is 0x2102 ......

adsl# adsl# adsl#conf t Enter configuration commands, one per line. End with CNTL/Z. tnatsis-adsl(config)#config-register 0x1234 tnatsis-adsl(config)#^Z tnatsis-adsl#sh ver .... Configuration register is 0x2102 (will be 0x214 at next reload) .... adsl#reload

I don't know what a confeg of 0x0 does, maybe that is not affecting anything.

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R

Agreed. I've been bit by a 3845 that had a similar problem. Setting the config register from rommon did no good. I had to set in from the IOS (a couple times if memory serves) to fix my problem.

J
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D

Try this:

boot system flash:c3620-is-mz.123-17b.bin

I got bit with the same thing on a 3700. Worked on that one.

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M

If problem continues, remove the boot system command and the router will try to booo the first image in flash

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A

Been reading 6500 documents. confreg 0x00 has a boot field of zero (last 3 bits) which will cause the device to remain in the ROM monitor.

Other reasons for remaining at ROM monitor include:- - Invalid software image - Corrupt config

So:- Boot router

conf t config-r 0x2102 end

wr

reload

There may be a variation between platforms in these regards and this is specifically for 6500, but worth a look.

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