Cisco Registry 0x11111111

[timbercrap]

we loaded from a tftp server ios 12.0 to a router(2516) and they are both on the router and when we tried to change the boot field which i may have done incorrectly i typed in config-register 0x11111111 and now i cant see anything on the screen i can still ping a port that was set up, but we never set up any sort of telnet or vty connection so i cant do that, it tells me the host refused the connection
how can i change that back or maybe manually clear the flash memory. THanks

 

[routerman]

Best way is to put the router into ROMmon, reload the router and hit break, this should eventually present you with the rommon> prompt.

You can set the config register from here, you should also be able to load new images using TFTP and delete existing images. Type HELP for some limited support.

 

[timbercrap]

when i am in hyperterminal, i can turn the router off and on and get no prompt, I cant see anything on the screen, the only reason i know it is working is beacuse i can ping an ethernet port from a different connecting router

 

[routerman]

Have a look at this URL, it may help.

http://www.cisco.com/univercd/cc/td/doc/product/access/acs_fix/cis2000/c2000qs/22812.htm

It says in this document that the break command can be entered following a power cycle regardless of settings. However the value you entered seems to set the router up to netboot, ignore the break key, and set the console for 2400 baud.

Does the 2516 have an AUX port, if so try your terminal in that port, you may get some output following a power cycle.

Try put the router into rommon, to do this power cycle and then hit the break key on the terminal. With my Hyperterminal I have to use CTRL BREAK, may be different on yours?

 

[timbercrap]

if that does work to get into the router, would erase flash, would that clear out the registry. Thanks.

 

[routerman]

No, the flash file system only holds the IOS images, there is another NVRAM system for the config register info. But, if you can get into rommon and see the command prompt (rommon>) then you have a chance, from there you can reset the config register value.

 

[simonxts]

You can download a free tool from Boson where you can calculate the conf-reg settings with.

http://download.boson.com/utils/bos_calc.exe

0x1111 is set/configured on the router, and this is what it means:
- console line speed 1200
- break disabled
- fast boot (on 7000 RP's)
- boot from ROM

The second "1" indicates you are unable to do a break using hyperterminal becasue it is disabled.
Unless there is an other way to reach the router, with telnet for example, the best thing is to return the device to your reseller !
2bad.

Simon

 

[timbercrap]

OK thanks guys, we got back in to it at 1200 baud but now that we fixed it how do we tell the router which IOS to boot from

 

[routerman]

To st up the router from ROMMON

rommon 1 >

Type help at pompt to list commands:

rommon 1 > help
alias set and display aliases command
boot boot up an external process
break set/show/clear the breakpoint
confreg configuration register utility
cont continue executing a downloaded image
context display the context of a loaded image
cookie display contents of cookie PROM in hex
dev list the device table
dir list files in file system
dis display instruction stream
dnld serial download a program module
frame print out a selected stack frame
help monitor builtin command help
history monitor command history
meminfo main memory information
repeat repeat a monitor command
reset system reset
set display the monitor variables
stack produce a stack trace
sync write monitor environment to NVRAM
sysret print out info from last system return
tftpdnld tftp image download
unalias unset an alias
unset unset a monitor variable
xmodem x/ymodem image download

Use Dev command to show file system devices:

rommon 2 > dev
Devices in device table:
id name
flash: flash

use DIR flash: to show files in filesystem

rommon 3 > dir flash:
File size Checksum File name
5485144 bytes (0x53b258) 0x8473 c2600-is56i-mz.120-5.T1.bin

Assuming a valid image is present try boot command.

rommon 4 > boot
program load complete, entry point: 0x80008000, size: 0x53b13c
Self decompressing the image : #################################################


If no valid image is present, then you will need to load one, I think the 2500 series can use TFTP to load an image, you'll need a TFTP server, and a suitable IOS image on the server.

If the 2500 has no support for TFTP in rommon then you'll need to use Xmodem to load the image over the serial port, I did this yesterday on a 3725, took 40 min to load!

Also use the command confreg to set the console baud rate and other settings, its a simple interactive menu structure.

Post back if you need more help.

 

[timbercrap]

we have two versions on there, 11.2 and 12 we can see both but not sure how to tell the router to boot from the new version?, we didnt want to delete 11.2 but we want to boot in 12.0?