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Cisco 837 Problem

I have a Cisco 837 Router. The problem I am facing is that its cookie information is corrupted.

System Bootstrap, Version 12.2(11r)YV3, RELEASE SOFTWARE (fc2)

Technical Support: http://www.cisco.com/techsupport

Copyright (c) 2004 by cisco Systems, Inc.

WARNING: Cookie information is corrupt

C800/SOHO series (Board ID: 23-0) platform with 65536 Kbytes of main memory

rommon 1 > cookie

WARNING: Cookie information is corrupt

cookie:

00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

Kindly tell me how to enter cookie values to boot properly.

Regards,

Mujeeb

18 REPLIES

Re: Cisco 837 Problem

Hi Mujeeb,

Was there a heavy rain or lighting at your location?

The router will be in ROMMON status, so don't try to use the TFTPDNLD command or XMODEM to load the IOS because it's still in the Flash.

Here's the steps to follow to repair the router:

1- in the rommon mode digit the command PRIV that allows to you to enter in the privileged mode, use the password 0000 (four zeros) and enter.

2- if you cookies are corrupt you'll see this situation:

>>rommon 1 > cookie

>>WARNING: Cookie information is corrupt

>>

>>cookie:

>>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

>>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

>>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

>>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

>>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

>>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

>>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

>>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

>>rommon 2 >

3- now type the command COOKIE so you can set the values manually.When you insert them you just need to insert the values after the :

Below you can see good cookies of a 827 router:

byte 0x00 - Version: 01

byte 0x01 - Vendor (Recommended Value: 0x01): 01

bytes 0x02-0x07 - Ethernet HW Address: 00 04 27 fe 00 ea

byte 0x08-0x08 - Processor (Recommended Value: 0x3e): 3e (0x3E for 827

e_machine=62)(0x5B for soho77 e_machine=91)

byte 0x09-0x09 - NVRAM Size (Recommended Values: 256K - 0x00): 00

byte 0x0a-0x0a - CPU Speed (Recommended Value: 50Mhz - 0x01): 01

byte 0x0b-0x0b - Unused: ff

bytes 0x0c-0x0d - On-board PM ID: 01 ff

bytes 0x0e-0x0f - MAC Address Allocated: 00 00

bytes 0x10-0x17: 00 00 00 00 00 00 00 00

bytes 0x18-0x22: 4a 41 44 05 42 30 39 ** ** 03 01 (Processor board ID

JAD054209**)+(CPU revision 0x301)

bytes 0x23-0x24 - Deviation: 6f e6 (hardware revision 6FE6)

bytes 0x25-0x2c: 00 00 00 00 ff ff ff 50 (50 should be cpu_type)

bytes 0x2d-0x2d - Board Config: 04

bytes 0x2e-0x31: 49 11 ec 03

bytes 0x32-0x37 - WAN MAC Address: ff ff ff ff ff ff

bytes 0x38-0x3f: ff ff ff ff ff ff ff ff

bytes 0x40-0x47: ff ff ff ff ff ff ff ff

bytes 0x48-0x4f: ff ff ff ff ff ff ff ff

bytes 0x50-0x57: ff ff ff ff ff ff ff ff

bytes 0x58-0x5f: ff ff ff ff ff ff ff ff

bytes 0x60-0x67: ff ff ff ff ff ff ff ff

bytes 0x68-0x6f: ff ff ff ff ff ff ff ff

bytes 0x70-0x77: ff ff ff ff ff ff ff ff

bytes 0x78-0x7f: ff ff ff ff ff ff ff ff

As i told you the important values are number after the : as you can see let's see the first two rows of the previous example :

byte 0x00 - Version: 01 -----> insert only 01

byte 0x01 - Vendor (Recommended Value: 0x01): 01 ---> insert 01

and the same for all the others rows.

The final situation of the cookies will be something like this:

01 01 00 b0 c2 8e 5e 81 5b 00 01 ff 01 ff 00 00

00 00 00 00 00 00 00 00 4a 41 44 05 31 30 50 38

33 04 01 00 00 00 00 00 00 ff ff ff 50 04 49 11

ec 04 ff ff ff ff ff ff ff ff ff ff ff ff ff ff

ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff

ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff

ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff

ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff

(these are exact cookies for a soho77)

At the end you just need to reset your router and your IOS and configuration will be there ready to work again.

HTH, if yes please rate the post.

Ankur

New Member

Re: Cisco 837 Problem

Dear Ankur,

PRIV command is not available in rommmon mode.

rommon 19 > ?

alias

boot

break

confreg

cont

context

cookie

dev

dir

dis

dnld

frame

help

history

meminfo

repeat

reset

set

stack

sync

sysret

tftpdnld

unalias

unset

xmodem

One more thing , how to enter these values bcz cookie command is not accepting any argument. Kindly reply ASAP.

Regards,

Mujeeb

Re: Cisco 837 Problem

Hi Mujeeb,

Try PRIV as it is a hidden command and if you get some error can you paste that error.

Also once you are in priv mode you need to enter COOKIE and hit enter and just insert the values

Try this and update

Ankur

New Member

Re: Cisco 837 Problem

Dear Ankur,

Thanks a lot for your reply and I am able to get into priv mode. One more favour required i.e Can u tell me cookie values for Cisco 837.

Thanks again.

Regards,

Mujeeb

Re: Cisco 837 Problem

Hi Mujeeb,

Not 100% sure for 837

The final situation of the cookies will be something like this:

01 01 00 b0 c2 8e 5e 81 5b 00 01 ff 01 ff 00 00

00 00 00 00 00 00 00 00 4a 41 44 05 31 30 50 38

33 04 01 00 00 00 00 00 00 ff ff ff 50 04 49 11

ec 04 ff ff ff ff ff ff ff ff ff ff ff ff ff ff

ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff

ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff

ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff

ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff

(these are exact cookies for a soho77)

So I think this should work. Just check my first post.

Regards,

Ankur

New Member

Re: Cisco 837 Problem

Hello Ankur,

I have changed cookie values but still Router is not booting properly, possibly b/c of wrong cookie values. Now i want to change the values again but problem is that I am not able to get into PRIV mode , Router accepts passwords but not get into required mode.

********************************

rommon 1 > priv

Password:

rommon 2 >

********************************

Thanks a lot for your support.

Regards,

Mujeeb

Re: Cisco 837 Problem

Hi Mujeeb,

To be frank I am clueless after this step. I tried this once and it worked for me in first hit.

You may need to contact Cisco TAC for further assistance. I am sorry but I tried my best to help you resolve your issue

Regards,

Ankur

Cisco Employee

Re: Cisco 837 Problem

Please post your new cookie value and I will try to figure out the new password.

Thanks

Anthony

New Member

Re: Cisco 837 Problem

Hi anthony,

Me & mujeeb r working on the same problem, cookie values are...., plz do let me know also how to figure out the password of privledged mode from cookie values in rommon......& could u plz let us know the exact cookie values for Cisco 837 as many of our routers are waiting for this solution....

**********************************************

rommon 3 > priv

Password:

rommon 4 > priv

Password:

rommon 5 > cookie

cookie:

01 01 00 04 27 fe 00 ea 3e 00 00 ff 01 ff 00 00

00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

00 00 00 6f e6 00 00 00 00 ff ff ff 50 04 49 11

ec 03 ff ff ff ff ff ff 00 00 00 00 00 00 00 00

00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

rommon 6 >

*************************************************

thanks for your effort..

Akhtar

New Member

Re: Cisco 837 Problem

Hi,

I saw this same response posted elsewhere on the Internet, but still dont understand what the following line means:

bytes 0x18-0x22: 4a 41 44 05 42 30 39 ** ** 03 01 (Processor board ID

JAD054209**)+(CPU revision 0x301)

How do I get the value to go in here?

I have about 20 x 827 routers which all have the same problem and if we can get this fixed it would be fantastic, but unfortunatley there is not much on how to recover from this situation on the web, and Cisco dont have any helpful documentation either.

Cheers

Re: Cisco 837 Problem

Hi Mujeeb,

I saw same issue in wan,switching and routing forum and Engineer from Cisco name Antony have answerd that problem.

I have posted in same forum to check your problem and reply you also you can look at that issue and ask your query there

http://forum.cisco.com/eforum/servlet/NetProf?page=netprof&forum=Network%20Infrastructure&topic=WAN%2C%20Routing%20and%20Switching&CommCmd=MB%3Fcmd%3Dpass_through%26location%3Doutline%40%5E1%40%40.1ddaefc9/0#selected_message

HTH

Ankur

Cisco Employee

Re: Cisco 837 Problem

The password for:

**********************************************

rommon 3 > priv

Password:

rommon 4 > priv

Password:

rommon 5 > cookie

cookie:

01 01 00 04 27 fe 00 ea 3e 00 00 ff 01 ff 00 00

00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

00 00 00 6f e6 00 00 00 00 ff ff ff 50 04 49 11

ec 03 ff ff ff ff ff ff 00 00 00 00 00 00 00 00

00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

rommon 6 >

*************************************************

Should be: 67ed.

I can give directions on how to figure it out obviously, but I can try and help you guys get your routers up and going. I will look for an 837 to see if I can find the correct cookie values.

New Member

Re: Cisco 837 Problem

Hi,

I have a number of 827's all with the same problem (probably about 15 or 20 of them).

I can get into priv mode, and enter the cookie stuff no worries. What I cant figure out is how to turn the block of values from a working cookie (as above), into answers for the priv mode cookie questions.

I tried just entering the pairs of digits in sequence, but when I looked at the cookie afterwards, it was different some values in the wrong place, and the router is still not working.

If you could PLEASE break down the 'cookie' output into the answers that we should provide during the 'priv cookie' command, then I should be able to use the values I have to get these routers up and running again.

Also, how can I determine what MAC address to enter.. there is no sticker on these machines (inside or out) to get that figure.. or does it not matter for this to work?

Many thanks.

New Member

Re: Cisco 837 Problem

Hi all,

I had exactly the same issue on a 826. I have resolved it successfully, and now I am working on a web page that will describe everything I found out. This will explain most of the contents of the cookie and also how to find out the "priv" password. It should be helpful for you guys, but it will take two or three days to finish. I'll post the link here.

In the meantime you may want to pass the time unscrewing your routers and writing down the processor board ID. It is printed on a label on the mainboard and should look like JAB01A1B2 (most of them start with JA or FO). This ID will be encoded into the cookie.

Also you should try to find out the MAC address of the box. This could be a bit more difficult since there is no label anywhere. Try your network management system if available, or some other software that may have the MAC address in some database, cache or similar. I have used a NAI RougeSystemSensor which had the MAC address in it's database.

It's not too serious if you are unable to find it out, since the router will work with virtually any valid AMC address, so you can also make a good guess. I will post some information about what makes a guess a good guess on my web page.

Hope to help you with that.

Patrick

New Member

Re: Cisco 837 Problem

How is the webpage coming along that will explain how to do this?

I have a 1711 with a corrupt cookie.

New Member

Re: Cisco 837 Problem

Dear NetPros

I have published a first (pre-) release of the page at http://www.bitshift.ch/eng/support/kbase/net.asp

Although it is not yet finished, it may give you enough information to solve your individual problems with cookie corruption.

Please check back soon, since I am still working on this article, and a new revision will be published every few days. I will add all my knowledge about cookies, of course also concerning other platforms like 1700.

Few details about the cookies are still totally unknown. Since Cisco officially doesn't answer any questions regarding those cookies, I depend on you NetPros, and the internet community in general. If you have additional knowledge, even small details, please let me know. My e-mail is on the home page.

Most useful are cookies of working routers. If you want to contribute, send me cookies along with detailed descriptions of the respective routers - maybe a show tech would be best. I will then analyze those cookies and maybe find out even more. (I will not publish any cookies without changing the processor board id and MAC address first.)

BTW: My newly created kbase also includes a tool to find out the priv rommon mode password.

Hope this helps.

Patrick

New Member

Re: Cisco 837 Problem

Dear Anthony,

Password which you gave is working and I have changed cookie values. After that router is booting properly. I found right cookie values from another Cisco 837 Router.

Thanks a lot for your support.

Regards,

Mujeeb

New Member

Re: Cisco 837 Problem

Dear Anthony,

I have another issue with Cisco 837 which I have posted at WAN,Routing and Switching Forum.

http://forum.cisco.com/eforum/servlet/NetProf?page=netprof&forum=Network%20Infrastructure&topic=WAN%2C%20Routing%20and%20Switching&CommCmd=MB%3Fcmd%3Ddisplay_location%26location%3D.1ddafd74

I hope you can also guide me on this issue.

Regards,

Mujeeb

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