Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

Catalyst 2950 Magic number mismatch ?

Hello,

For my CCNA training I have ordered some good old CISCO products

But one of the switches that I have received do not want to boot

I have try to google and try many things this week-end , but without success.

When I take a look in the DIR FLASH:

I can see only c2950-i6Q4l2-mz.121-20.EA1a.bin

when I take a look in the SET

I have nothing , even the MAC address is not present.

Off course I have try :

FLASH_INIT

LOAD_HELPER

but still the set stay empty.

Any help is welcome.

Thank you in advance.

Best Regards,

Didier.

1 ACCEPTED SOLUTION

Accepted Solutions
Hall of Fame Super Gold

Re: Catalyst 2950 Magic number mismatch ?

The IOS is corrupt.

Xmodem Console Download Procedure Using ROMmon
http://www.cisco.com/en/US/customer/products/hw/routers/ps259/products_tech_note09186a008015bfac.shtml

Hope this helps.  Please don't forget to rate useful post.  Thanks.

3 REPLIES
Hall of Fame Super Gold

Re: Catalyst 2950 Magic number mismatch ?

The IOS is corrupt.

Xmodem Console Download Procedure Using ROMmon
http://www.cisco.com/en/US/customer/products/hw/routers/ps259/products_tech_note09186a008015bfac.shtml

Hope this helps.  Please don't forget to rate useful post.  Thanks.

New Member

Re: Catalyst 2950 Magic number mismatch ?

Thank You for your prompt reply

I have deleted the IOS file and have copy one of my working switches to it , but still I have the same problem.

What I found strange is that on all my other switches , when I press SET , I can see the serial numbers and devices numbers, etc.

Can this not be the problem , that the IOS does not know if he has 12 , 24 or 48 ports ?

Do I have to key in is SET all the missing values ?

PS: Unfortunately ,I do not have the right "yet" to open your link , but I think it is the one where the explain how to recover a CATALYST 2950 with XMODEM , but this one I tried already

Thank you again for your help

Best Regards,

Didier

New Member

Re: Catalyst 2950 Magic number mismatch ?

Hello,

Just in case some other ones do the same mistake like I did :

When you have this kind of problem or error and you have to use XMODEM , please be aware that you have many options to send your file.

In my case I use ZTERM on my MAC and by default the setting was on : SMART MAC BINARY

I have change it to BINARY DATA , and it works great

The reason why I was looking in this XMODEM settings , where due to that I have two SWITCHES CATALYST 2950 with the same IOS.

When I compare both binary sizes the one that was working has 3117390 , and the one that has the MAGIC NUMBER MISMATCH has 3117568.

So we can conclude that the MAGIC NUMBER MISMATCH is a kind of wrong check sum.

I hope this will be useful for the ones that have the same problem

Best Regards,

Didier.

1656
Views
5
Helpful
3
Replies