How to restore IOS

[saidfrh]

I tried to upgrade the IOS on my 2501 router. At the start of the upgrading, I received a warning that the file would be erased. After the upgrading was in effect for a while, the error message showed up: "...Error : memory requirements exceed available memory;..Software forced crash at 0x111E.."

This error messages are being displayed in a continious loop. Even when I shut down the router and turn it back on, I receive the above messages contunually. I can get to user mode.

Does any one have any suggestion as to how to restore the IOS/router?

[milan.kulik · Accepted solution]

Hi,

1) Send a break sequence from the terminal keyboard within 60 seconds of the power-up to put the router into ROMmon.

See http://www.cisco.com/en/US/customer/products/hw/routers/ps233/products_password_recovery09186a0080094795.shtml

for details.

2) Recover the IOS on the Flash

using tftp

http://www.cisco.com/en/US/customer/products/hw/routers/ps233/products_tech_note09186a008009464c.shtml

or xmodem

http://www.cisco.com/en/US/customer/products/hw/routers/ps259/products_tech_note09186a008015bfac.shtml

Regards,

Milan

[saidfrh]

Thanks.

[saidfrh]

I manges to console in using 4800 bits /sec.

1. The ethernet connection keeps going up and down continiously on the 4500 router. Any suggestions to trouble shoot?

2. The network consists of 2 x 2501 routers and the 4000 router. The two 2501 requires 9600 bits /sec, and the 4000 router requires 4800 bits persecond on the hyperterminal. Any suggestions on means to not have to configure one model on a session, shutting the session and starting another session to configure other model.

[milan.kulik]

Hi,

ad 1. Try to check duplex/speed.

ad 2. It should be possible to set the console speed on the 4000 router via config registers.

Download the Confreg Calculator tool from http://www.boson.com/promo/utilities.htm

for easy confreg understanding.

Regards,

Milan

[saidfrh]

Milan,

Any ideas how to restore the IOS on the 4000 router? I forgot to save flash to tftp server.

Router(boot)#sh ver

4000 Bootstrap Software (XX-RXBOOT), Version 9.1(1), SOFTWARE [fc1]

Copyright (c) 1986-1992 by cisco Systems, Inc.

Compiled Mon 19-Oct-92 14:05 by jthomas

System Bootstrap, Version 4.6(1), SOFTWARE

Router uptime is 9 minutes

System restarted by power-on

Running default software

cisco 4000 (68030) processor (revision 0xA0) with 16384K/1024K bytes of memory.

Processor ID 5019106

DDN X.25 software.

2 Serial network interface.

128K bytes of non-volatile configuration memory.

4096K bytes of flash memory on embedded flash (in XX).

Configuration register is 0x141

Router(boot)#sh flash

4096K bytes of flash memory on embedded flash (in XX).

file offset length name

0 0x40 3712474 c4000-j-mz.112-26b.bin

[481764/4194304 bytes free]

Router(boot)#

[milan.kulik]

You can use similar procedure.

See http://www.cisco.com/cgi-bin/Support/browse/psp_view.pl?p=Hardware:4000&viewall=true

for recovery articles.

Regards,

Milan